|
Biological Characteristics
Species |
Mustela
vison is 0.7 to 1.1 kg in weight and its bushy tail
accounts for approximately one-third to one-half of its 46 to 70 cm
length. Males can weigh up to twice as much as females (McVey et al.,
1993). Its neck and body are long and thin, and supported by short
sturdy legs. Its dark, chestnut brown fur is interrupted by occasional
white spots on the undersides (Chapman and Feldhamer, 1982). |
Status
in Estuaries |
Breeder.
Occurs in wetland areas of all kinds including banks of rivers, streams,
lakes, marshes, swamps, and ditches. Dens are located in tree roots and
old beaver lodges (Burns, 1964). Mink are generally solitary with
association occurring only between the female and her young of the year
(McVey et al., 1993). Average litter size is 4-5 (Wren, 1991). |
Abundance
and Range |
Occurs
throughout the U. S. except for the desert southwest region (Godin,
1977). Population densities typically range from 0.01-0.10 mink per
hectare (McVey et al., 1993). From 1956 to 1978 an average of 256,373
mink pelts were taken yearly from the wild (Chapman and Feldhamer,
1982). |
Site
Fidelity |
Home
range of adult male is 1.8 to 5 kilometers (Chapman and Feldhamer,
1982). Males move frequently using dens that are most accessible (Godin,
1977). |
Ease
of Census |
Difficult |
Feeding
Habits |
Opportunistic.
Primarily nocturnal hunters, mink feed on muskrats, shrews, insects,
birds, bird eggs, fish, crayfish, and snails (Burns, 1964; Wren, 1991).
Competent swimmers, they often hunt prey in water. Females tend to have
a harder time than males hunting larger prey such as muskrats and
rabbits, and are more limited in their diets (McVey et al., 1993). Mink
kill by biting prey on the neck (Whitaker, 1980). |
|
|
I. |
Organochlorine Contaminants |
1. |
During
the 1970-71 fur season, 35 mink were collected from the central Iowa
counties of Story, Boone, and Hamilton (Franson et al., 1974). Adipose
tissue was analyzed for all samples, and brain and liver analyzed for
five of these samples. Residues of DDE
were <5.40 µg/g wet weight in adipose tissue, <0.08 µg/g in the
brain, and <0.11 µg/g in the liver. DDD
was <1.54 µg/g adipose, <0.05 µg/g brain, and <0.03 µg/g
liver. DDT was <1.85 µg/g
adipose, not detected in the brain, and detected in two mink livers at
0.01 µg/g. o,p’-DDT
was <1.22 µg/g adipose, not detected in the brain, and detected in
one mink liver at 0.01 µg/g. Dieldrin
was <4.90 µg/g adipose, <0.04 µg/g brain, and <0.07 µg/g
liver. Heptachlor epoxide
was detected in 20 mink in the adipose tissue at levels <0.20 µg/g. Lindane
was detected in the brain at <0.04 µg/g and not detected in the
liver. ß-BHC was detected in 7 mink in adipose tissue at <0.11
µg/g, detected in the brain at <0.08 µg/g, and not detected in the
liver. Organochlorine residues did not differ among various age classes. |
2. |
Mink
collected in 1973-74 from the county of Simcoe in southern Ontario were
analyzed for organochlorine residues (Frank et al., 1979). Average
concentration of organochlorines detected in the muscle were 0.054 µg/g
wet weight DDE, 0.0036 µg/g
TDE, 0.0053 µg/g dieldrin,
and 0.27 µg/g PCB.
Concentrations in fat were 4.2 µg/g DDE+TDE,
0.76 µg/g dieldrin and 32
µg/g PCB. |
3. |
Mink
from areas of Alabama and Georgia treated with mirex between 1973 and 1976 were collected six months, one
year, and two years after cessation of treatment and quantified for
organochlorine contaminants (Hill and Dent, 1985.) Mean residues in
muscle samples showed a gradual increase from 0.14 µg/g wet weight, to
0.28 µg/g, to 0.53 µg/g, respectively. Liver levels were 0.10 µg/g,
0.41 µg/g, and 0.05 µg/g, respectively. |
4. |
During
1978-79, brain, liver, and muscle tissues were analyzed from 32 mink
collected in rural western Maryland (O’Shea et al., 1981). Livers of 4
of 10 females from Frederick and Carroll Counties contained detectable
levels of PCBs, with an
arithmetic mean of 1.17 µg/g wet weight. Three of twelve males from
these counties also contained detectable PCB
levels in the liver at 1.1, 1.4, and 2.0 µg/g. The highest
concentration detected was 2.4 µg/g PCBs
from a female in Harford County. PCBs
were not detected in other tissues, with the exception of two Frederick
County individuals. One male contained 0.44 µg/g and 0.60 µg/g in
brain and muscle, respectively, and 0.99 µg/g was detected in the brain
of a female. Other contaminants were detected at low concentrations
including oxychlordane
(<2.2 µg/g), DDE
(<0.50 µg/g), dieldrin
(<0.07 µg/g), heptachlor
epoxide (<0.20 µg/g), DDT
(0.17 µg/g) and trans-nonachlor (0.17 µg/g). |
5. |
From
1978 to 1979, 59 mink carcasses were collected from five locations in
Oregon: Lower Columbia River, northwest coastal rivers region, the Blue
and Wallowa Mountains, Upper Klamath Lake, and Klamath River (Henny et
al., 1981). DDE, oxychlordane,
and PCBs were analyzed in
the liver. With only 2 exceptions, DDE
from all location were <1 µg/g wet weight. One male collected from
the northwest coastal rivers and one from the Blue and Wallowa Mountains
each contained DDE residues
of 1.2 µg/g. Oxychlordane
was detected at <1 µg/g in all mink examined. PCBs
were detected at a high of 3.5 µg/g in a male from the NW Coastal
Rivers. In addition to the liver, the leg muscle was also analyzed for DDE
and PCBs. DDE
in the leg muscle was detected at <1 µg/g at all locations sampled. PCBs were detected at highs of 1.6 and 1.5 µg/g in males
from the Lower Columbia River and the northwest coastal rivers,
respectively. |
6. |
In
1978 to 1979, 55 wild mink from five regions in lake Erie were analyzed
for PCB and organochlorine
residues (Proulx et al., 1987). PCB
geometric means for Mersea, Dunn-Rainham, Walsingham, Wainfleet, and
Tuscarora Townships were 1.32 µg/g wet weight, 1.71 µg/g, 0.51 µg/g,
0.29 µg/g, and 0.08 µg/g, respectively. DDE
concentrations were 0.22 µg/g, 0.14 µg/g, 0.26 µg/g, 0.05 µg/g, and
0.07 µg/g, respectively. HCB
values were <0.01 µg/g for all townships. Oxychlordane,
ß-HCH, DDD,
and dieldrin levels were detected at <0.03 µg/g for all
townships. DDT was detected
at a level of 0.02 µg/g in one mink in each of Mersea and Walsingham
townships. Mirex was not
detected in this study. PCB
lipid weights were 29.17 µg/g, 26.12 µg/g, 10.74 µg/g, 6.08 µg/g,
and 1.81 µg/g, respectively. DDE
lipid weights were 4.83 µg/g, 2.08 µg/g, 5.48 µg/g, 1.16 µg/g, and
1.62 µg/g, respectively. |
7. |
Mink
trapped from eight locations in New York state between 1982 and 1984
were analyzed for organochlorine contaminants in the fat and liver
(Foley et al., 1988). Geometric mean PCB
(Aroclor 1254/1260)
concentrations in the eight locations ranged from 0.8-4.4 µg/g wet
weight in the fat and 0.1-0.6 µg/g in liver. Mean DDE
concentrations ranged from 0.12-0.74 µg/g in fat and 0.01-0.04 µg/g in
liver. Lowest values of both compounds occurred on the West Appalachian
Platueau and highest were on the North Hudson River for PCB
and the West Adirondack Mountains for DDE. |
8. |
Adipose
and liver tissues were analyzed from 109 mink collected between 1983 and
1985 from six samples sites in New York State: the eastern lake plains,
west Adirondack Mountains, northeast Adirondack Mountains, the Hudson
River Valley (HR), the Appalachian Plateau, and from within 8 km of Lake
Ontario (LO) (Foley et al., 1991). Geometric means of liver residues
were 0.3 µg/g wet weight PCB,
0.03 µg/g DDE, 0.002 µg/g
HCB, and 0.032 µg/g dieldrin.
PCBs ranged from 0.1-37.6 µg/g, and were significantly
higher in LO and HR compared to other sites. Also detected at low levels
were mirex and photomirex
(LO only), and oxychlordane.
|
9. |
Mink
found dead in Wisconsin from 1986-1987 were analyzed for PCB
residues in muscle (Meyer and Hurley, 1991). Two groups of mink
collected from the Oconto River had mean PCB
levels of 1.9 and 2.3 µg/g wet weight. Two mink found near the
Sheboygan River had concentrations of 5.4 and 1.9 µg/g, and one found
near Buffalo had a level of 0.3 µg/g. A total of five carcasses from
sites that did not have PCB-contaminated
fish (backwaters of the Mississippi River and Langlade, Jackson,
Columbia, and Green Lake Counties) had PCB
levels at or below the detection level (0.20 µg/g). Dieldrin
and DDE were detected in the Oconto County carcasses only
(<0.5 µg/g). |
10. |
Mink
carcasses were collected between 1987-89 from 24 watersheds in
Connecticut and 9 in Massachusetts (Major and Carr, 1991). Mean chlordane
concentrations for watersheds ranged from 0.19-1.50 µg/g wet weight in
Connecticut and 0.05-0.56 µg/g in Massachusetts. Mean DDT
concentrations ranged from 0.10-0.49 µg/g in Connecticut and 0.03-0.17
µg/g in Massachusetts. Mean PCB
concentrations ranged from 0.94-10.0 µg/g in Connecticut and 0.44-4.1
µg/g in Massachusetts. Mean dieldrin
concentrations ranged from 0.040-0.13 µg/g in Connecticut and
0.005-0.115 µg/g in Massachusetts. Concentrations of endrin
and mirex were <0.05 µg/g
for both states. Values of chlordane,
DDT, and PCB
were significantly higher in Connecticut than Massachusetts. |
11. |
A
total of 79 mink were collected from trappers in1988 and 1989 from
fifteen townships in central or southern Ontario (Haffner et al., 1988).
Maximum mean concentrations of PCB
congeners were 1.2 ng/g wet weight PCB
52, 7.2 ng/g PCB 101,
1.9 ng/g PCB118, 73 ng/g PCB
153, 4.7 ng/g PCB 105,
131 ng/g PCB 138, 144 ng/g PCB
180, 13 ng/g PCB 203,
1.1 ng/g PCB 77, 1.6 ng/g PCB
126, and 0.29 ng/g PCB 169.
TEQs ranged from
3.4-171 pg/g, and were comprised of over 90% PCBs
126 and 118.
Mean concentrations of α-HCH,
HCB, oxychlordane,
DDE, DDD,
photo-mirex,
mirex, heptachlor
epoxide, and dieldrin
were <0.2 ug/g. |
12. |
A
decline in coastal mink populations in Georgia, North Carolina, and
South Carolina prompted the 1989 to 1991 collection of 141 mink from the
three states to examine levels of 17 substances (Osowski et al., 1995).
Coastal individuals were compared with samples from the piedmont,
mountain, and foothill areas. Two substances had significantly higher
concentrations in coastal regions: PCB,
detected in 97% of mink with a median concentration of 0.211 µg/g wet
weight, and dieldrin, found
in 64% with a median of 0.0865 µg/g. Also detected in coastal mink in
all three states was DDE at
0.105 µg/g. Aldrin was
found at 0.272 µg/g in South Carolina, trace levels in Georgia, and was
not detected in North Carolina. DDD
levels were 0.15 µg/g in Georgia, trace amounts in North Carolina and
not detectable in South Carolina. DDT
was found in North Carolina mink only at levels of 0.018 µg/g and chlordane
was found at trace levels in Georgia alone. Not detected in any of the
coastal populations were endrin
and
-BHC.
|
13. |
A
total of 213 wild mink were collected in Minnesota during the 1989 and
1990 trapping seasons (Ensor et al., 1993). Elevated organochlorine
levels detected were at 0.029 µg/g wet weight DDT,
0.398 µg/g DDE, 0.035 µg/g
dieldrin, 0.4438 µg/g
total DDT, 0.569 µg/g Aroclor
1254, 1.238 µg/g Aroclor
1260, and 1.807 µg/g total PCBs. |
14. |
During
the winters of 1990-1992, trappers submitted samples collected within 10
meters of the river bank, including 11 mink from the upper reaches of
the Fraser River and 19 mink from along the Columbia River (Elliott et
al., 1999). Four mink were
also collected from a reference site, Malheur National Wildlife Refuge.
Hepatic concentrations of organochlorines, pooled from each of 13
collection sites, were generally low (<0.10 ug/g wet weight) at all
sites, with the exception of DDE (means ranged from 0.0013 - 2.400 ug/g), and PCBs
(ND-0.380 ug/g). Concentrations
of PCDDs and PCDFs were generally low (<0.1 pg/g), with the exception
of OCDD, for which means
ranged from ND-0.842 pg/g. Concentrations
of PCB congeners ranged
from ND-0.112 pg/g 37,
ND-0.0051 pg/g 81, 0.0031 -
0.014 77, 0.0029-0.220 pg/g
126, ND-0.018 pg/g 169,
ND-6.600 pg/g 105,
ND-31.400 pg/g 118, and
ND-0.0087 pg/g 189.
TEQs were generally
higher on the upper Columbia River compared to other sites, with values
reaching 0.031 pg/g. |
15. |
A
total of 1025 mink carcasses were collected from seven locations in the
western Northwest Territories in Canada during winters 1991-92 to
1994-95 (Poole et al., 1998). Contaminant concentrations (ng/g wet
weight) were determined in liver for each location and means ranged as
follows: 1.19-9.52 total DDT,
0.03-0.20 total HCH,
0.05-0.67 HCB, 0.87-3.48 total chlordane, 0.08-0.74 dieldrin,
0.08-0.39 total mirex, and
7.02-73.07 total PCB. DDE
was detected in 96.7% of livers and comprised 99% of residues in total
DDT. The majority of PCB congeners
detected contained more than five chlorine atoms. Concentrations of total
HCH and HCB were significantly higher in females than males. TEQs
of liver tissue were generally low, reaching a maximum of 0.28 pg/g wet
weight at one location. |
16. |
A
total of 26 skinned mink carcasses were collected from commercial
trappers during the winters of 1994-1995 and 1995-1996 from four
locations in British Columbia: Fraser River near Prince George and
Chilliwack, Fraser Valley near the terminus of the Fraser River,
Kootenay River near Creston and Cranbrook, and Columbia River between
Revelstoke and Trail (Harding et al., 1999).
Hepatic concentrations of PCBs,
dieldrin, and DDT-related
compounds (primarily DDE)
were 0.08 µg/g wet weight in mink from the Lower Fraser River (N=8) and
the Upper Fraser River (N=12). At
Kootenay River (N=4) and Lower Fraser Valley (N=2), respectively,
hepatic concentrations were 16 and 18 ng/g total
PCBs, 11 and 8.8 pg/g PCB-77,
and 24 and 62 pg/g PCB-126.
Concentrations of PCB-169,
PCDDs, and PCDFs
were below the limit of detection at both sites. These concentrations were similar to those from an earlier
collection of mink (1990-1991) from the Columbia River and Fraser
Valley. There was no
difference in contaminant concentrations between males and females at
any site. A significant
correlation existed between age and total pesticide contamination.
|
17. |
From
1993-1994, captive mink at Michigan State University Experimental Fur
Farm were housed in individual outdoor cages and fed fish from Poplar
Creek in the Oak Ridge Reservation (ORR), Tennessee, as well as from two
reference sites, Clinch River above the ORR, and the Atlantic Ocean (Halbrook
et al. 1999). Five groups of 8 female and 2 male mink were fed diets
with the following combination of fish mixed with mink chow: 75% ocean
fish (diet A), 75% Clinch
River fish (diet B), 25%
Poplar Creek fish and 50% ocean fish (diet C), 50% Poplar Creek fish and
25% ocean fish (diet D), and 75% Poplar Creek fish (diet E).
Mean concentrations (ng/g wet weight) of arochlor
1260 in adult female mink fat tissues were 3,169 for diet A,
61,250 for diet B, diet C was not quantified, 105,860 for diet D, and
128,630 for diet E. Mean
concentrations (ng/g wet weight) of arochlor
1260 in adult female mink liver tissue were <5 on all
diets, except for diet E, where it was 7,250.
Mean concentrations (ng/g wet weight) of arochlor
1260 in 6-week-old kit liver tissue were 99 for diet A, 785
for diet B, NQ for diets C and D, nad 5,396 for diet E.
Mean concentrations (ng/g wet weight) of arochlor
1260 in 6-week-old kit whole body (minus liver) were: 82 for
diet A, 1,791 for diet B, NQ for diets C and D, and 6,260 for diet E. Female fat and kit liver and whole body arochlor 1260
concentrations were significantly lower on diet B than E (p values
ranged from 0.003 to <0.001). |
18. | During the winters of 1998/1999-2002/2003, 83 carcasses were collected from mink trapped from near the Canadian shores of Lakes St. Clair and Erie (Martin et al. 2006). Mink from the western Lake Erie sites had higher concentrations of PCBs than those from inland sites or Lake St. Clair. Contaminants in were detected at the following levels (ng/g wet weight): 2.5-23.6 total PCBs, 0.40-3.69 DDE, 0.27-0.66 DDT, nd-0.069 DDD, 0.066-2.629 oxychlordane, nd-1.036 dieldrin, nd-0.061 heptachlor epoxide, nd-0.264 mirex, nd-0.092 octachlorostyrene. |
II. |
Cholinesterase-Inhibiting Pesticides |
|
No
direct exposure data available |
III. |
Trace Elements, Metals, and Metalloids |
1. |
Mink
collected along the Wisconsin River watershed in 1972-1975 were analyzed
for Hg in the fur (7.71 µg/g
wet weight), liver (2.08 µg/g), kidney (2.33 µg/g), muscle (1.26 µg/g),
and brain (0.46 µg/g) (Sheffy and St. Amant, 1982). Mercury
concentrations in the mink were generally greater than in other
furbearers that were collected (beaver, muskrat, red fox, and raccoon)
with the exception of the river otter. |
2. |
Hair
samples from mink collected from the piedmont and lower coastal plain of
Georgia in 1973 contained a mean Hg
concentration of 10.7 µg/g dry weight (Cumbie, 1975). |
3. |
Mink
collected in 1973-1974 from the county of Simcoe in southern Ontario
contained a mean of 0.71 µg/g wet weight Hg
residue in the muscle (Frank et al., 1979). |
4. |
A
wild female mink found in 1975 in the proximity of the South
Saskatchewan River near the city of Saskatoon was diagnosed with Hg poisoning (Wobeser and Swift, 1976). Mercury
concentrations detected were 58.2 µg/g in the liver, 31.9 µg/g in the
kidney, 15.2 µg/g in the muscle, 13.4 µg/g in the brain, and 34.9 µg/g
in the fur. |
5. |
Carcasses
of 173 mink were collected from 1979 to 1981 from five Manitoba drainage
basins: Duck Mountain (control), Wekusko, Whiteshell, Burntwood, and
Winnepeg River (Kucera, 1982). Mean Hg
levels for males and females of each area found in the liver were,
respectively, 1.05 and 3.44 µg/g dry weight, 2.35 and 4.68 µg/g, 3.38
and 4.87 µg/g, 4.13 and 7.31 µg/g, and 7.45 and 12.31 µg/g. Mean Hg
kidney levels were 1.02 and 2.32 µg/g, 2.33 and 2.31 µg/g, 3.18 and
3.44 µg/g, 2.40 and 7.02 µg/g, and 6.08 and 8.05 µg/g. Mean Hg
brain concentrations were 0.36 and 0.93 µg/g, 0.75 and 1.78 µg/g, 1.05
and 1.51 µg/g, 1.23 and 5.28 µg/g, and 2.66 and 3.36 µg/g. When
values for males and females were combined, samples from Burntwood and
Winnipeg were both significantly higher than the control location. |
6. |
Mink
carcasses collected from Virginia trappers during the 1981-82 and
1982-83 seasons were analyzed for metals (Ogle et al., 1985).
Concentrations of Pb ranged
from 0.00-21.15 µg/g dry weight in the bone, 0.00-5.22 µg/g in the
kidney, and 0.00-12.74 µg/g in the liver. Zinc
values ranged from 54.01-215.74 µg/g in the bone, 48.24-173.40 µg/g in
the kidney, and 54.68-304.17 µg/g in the liver. Concentrations of Cu
were 0.00-29.74 µg/g in the bone, 6.65-196.67 µg/g in the kidney, and
10.84-193.56 µg/g in the liver. Cadmium,
measured only in the kidney and liver, ranged from 0.11-15.99 µg/g and
10.84-193.56 µg/g, respectively. |
7. |
From
1981 to 1983, mink samples were collected from Okanogan county,
Washington, and the North Fork and main channel of the Coeur d’Alene
river in Idaho (Blus et al., 1987). Lead
was highest in liver samples collected from the main channel (geometric
mean 4.1 µg/g wet weight). The geometric mean for Cu
ranged from 3.2 µg/g in the North Fork to 7.9 µg/g in the main
Channel. Zinc values were
lowest in the North Fork (geometric mean 14.4 µg/g) and highest in
Washington (28.0 µg/g). Mercury
concentration was highest in Washington (geometric mean 1.26 µg/g), and
Cd, which was analyzed in
the kidney samples, was highest at the main channel (0.57 µg/g). |
8. |
Mink
trapped from eight locations in New York state between 1982 and 1984
were analyzed for Hg
contamination in liver (Foley et al., 1988). Geometric mean
concentrations in the eight locations ranged from 0.94-2.87 µg/g wet
weight. Lowest values were detected at Lake Ontario and highest values
at the Northeast Adirondack Mountains. |
9. |
During
the 1983-1984 and 1984-1985 trapping seasons, 94 mink were collected
from five study sites in Ontario for Hg
analysis (Wren et al., 1986). The sites included the English River
system (contaminated with Hg
from chlor-alkali plant between 1962 and 1970), the Turkey Lakes
(relatively pristine), the Muskoka lakes (reduced pH from acid
precipitation), Sudbury (subject to acid and metal deposition from
smelter emissions since 1885), and Cambridge (reference site). At the
contaminated sites, liver and kidney had greater Hg
concentrations than muscle and brain; liver and kidney concentrations
were 2.55 and 2.08, 2.36 and 1.86, 2.17 and 2.49, 0.56 and 0.59 µg/g
wet weight; at the reference site liver Hg
concentration was 0.14, and kidney samples were apparently not analyzed.
|
10. |
Adipose
and liver tissue were analyzed from 109 mink collected between 1983 and
1985 from six samples sites in New York State: the eastern lake plains,
west Adirondack Mountains, northeast Adirondack Mountains, the Hudson
River Valley, the Appalachian Plateau, and from within 8 km of Lake
Ontario (Foley et al., 1991). Geometric mean concentrations of metals
detected were 1.85 µg/g wet weight Hg,
0.16 µg/g Cd, and 0.27 µg/g
Pb. |
11. |
From
1984-89, 29 mink were trapped in north-central Illinois (Halbrook et
al., 1996). Fourteen elements were detected in at least 75% of the
samples. For example, kidney, liver, and muscle samples contained (µg/g
wet weight): 6.51, 4.52, 7.85 Al;
4.30, 6.76, 3.07 Cu; 20.47,
24.06, 37.28 Zn; and 0.14,
0.21, 0.21 Hg. Mean
concentrations of other elements detected in fewer than 75% of the
samples were: 2.30, 1.67, 2.16 As;
0.06, 0.06, 0.06 Be; 0.32,
0.18, 0.08 Cd; 2.16, 1.72,
1.80 Cr; 0.33, 0.27, 0.20 Mo;
and 1.07, 0.85, 0.67 Ni. Vanadium
was quantified in the kidney and liver only, at mean concentrations of
2.63 and 2.08. Lead was
measured in the liver and muscle only, at means of 0.90 and 0.73. Mean
concentrations of Se and Sn,
measured only in the kidney were 1.75 and 0.84, and Sb,
measured only in the liver, was 0.92. |
12. |
Mink
found dead in Wisconsin from 1986-1987 were analyzed for concentrations
of Hg in liver (Meyer and
Hurley, 1991). Two groups of mink collected from the Oconto River had
mean total Hg levels of
0.43 and 0.88 µg/g wet weight. Two mink found near the Sheboygan River
had concentrations of 0.63 and 0.08 µg/g. A total of four carcasses
from Langlade, Jackson, Columbia, and Buffalo Counties had Hg
levels of 0.88, 1.60, 0.21, and 0.23 µg/g, respectively. |
13. |
Mink
carcasses were collected between 1987-89 from 24 watersheds in
Connecticut and 9 in Massachusetts for determination of contaminant
levels (Major and Carr, 1991). Mean Hg
concentrations for watersheds ranged from 1.1-8.47 µg/g wet weight in
Connecticut and 0.008-1.92 µg/g in Massachusetts. Overall Hg
values were significantly higher in Connecticut. |
14. |
A
total of 213 mink occurring throughout Minnesota were collected during
the 1989 and 1990 trapping seasons (Ensor et al., 1993). Metals detected
included Hg (1.94 µg/g), Se
(0.95 µg/g), Pb (0.61 µg/g),
and Cd (0.29 µg/g). |
15. |
A
decline in coastal mink populations in Georgia, North Carolina, and
South Carolina prompted the 1989 to 1991 collection of 141 mink from the
three states to determine of concentrations of 17 substances (Osowski et
al., 1995). Coastal individuals were compared with samples from the
piedmont, mountain, and foothill areas. Mercury
was found in significantly higher concentrations in coastal regions,
with a 2.244 µg/g wet weight median concentration. Also detected in
coastal mink in all three states was Cu
at 0.224 µg/g. |
16. |
Mink
carcasses collected from commercial trappers in British Columbia from
1990-1995 were analyzed for exposure to 20 metals (Harding et al.,
1998). With the exception
of Cd, which was elevated
in mink from the Kootenay River, concentrations in both tissues were
considered low and within the normal range for this species.
Renal concentrations in samples collected from the Kootenay River
and the Lower Fraser River, respectively, were 3.25 and 7.18 µg/g dry
weight Al, 0.29 and 0.15 µg/g
Ba, 3.61 and 0.73 Cd,
494 and 381 µg/g Ca,
<0.4 and 0.25 µg/g Co,
0.98 and 1.68 µg/g Cr,
12.13 and 12.4 µg/g Cu,
715 and 456 µg/g Fe, 1.13
and 0.59 µg/g Pb, 433 and
533 µg/g Mg, 2.4 and 3.56
µg/g Mn, 3.37 and 3.13 µg/g
Hg, <0.8 and 0.48 µg/g Mo,
7010 and 8680 µg/g K, 4.0
and <4 µg/g Se, 4360
and 4710 µg/g Na, 0.52 and
0.45 µg/g Sr, 6.25 and 5.5
µg/g Sn, 0.13 and 0.41 µg/g
Ti, and 67 and 65 µg/g Zn.
Hepatic concentrations in samples collected from the Lower and
Upper Fraser River, respectively, were 3.63 and 3.5 µg/g Al, 0.06 and 0.08 µg/g Ba,
0.26 and 0.10 Cd, 380 and
551 µg/g Ca, 0.23 and 0.33
µg/g Co, 1.16 and 1.98 µg/g
Cr, 23 and 24 µg/g Cu,
1050 and 982 µg/g Fe, 0.45
and 0.21 µg/g Pb, 634 and
580 µg/g Mg, 8.98 and 8.53
µg/g Mn, 4.62 and 4.05 µg/g
Hg, 1.5 and 0.98 µg/g Mo,
7470 and 8110 µg/g K, 2.06
and 2.42 µg/g Se, 5050 and
4490 µg/g Na, 0.45 and
0.32 µg/g Sr, 5.53 and
5.17 µg/g Sn, <0.2 and
<0.2 µg/g Ti, and 95
and 95 µg/g Zn.
|
17. |
A
total of 1025 mink carcasses were collected from seven locations in the
western Northwest Territories in Canada during winters 1991-92 to
1994-95 (Poole et al., 1998). Heavy metal concentrations (µg/g dry
weight), excluding Hg, were determined in kidney for each location and
included the following ranged of means: 2.34-9.49 Al,
0.16-1.12 Cd, 14.29-20.82 Cu,
0.19-1.89 Ni, and 0.10-0.99 Pb.
Mercury, analyzed in the
liver, ranged from means of 0.91-3.30 µg/g wet weight among locations. |
18. |
Of
eight mink collected between 1993 and 1994 near a Hg
mine in Clear Lake, California, only one Hg
concentration value approached toxicity thresholds for wildlife species
and was found in the brain of an individual mink (Wolfe and Norman,
1998). Mercury
concentrations in tissues for that mink (in mg/g
wet weight) were as follows: 7.10 in brain, 9.25 in liver, 21.5 in fur,
0.18 in blood, and 34.1 in claws. The
other seven mink collected were all below the following Hg
tissue concentrations (in mg/g):
0.40 in brain, 10.1 in liver, 7.99 in fur, 0.63 in blood, 1.13 in
muscle, 1.30 in kidney, and 11.9 in claws. |
19. |
Wild
mink were collected during two trapping seasons (1993-1994 and
1994-1995) from James Bay Territory, Québec, Canada (Fortin et al.,
2001). For the 1993-1994
trapping season, mean total Hg
concentrations (N=39) in tissues ranged from 0.96 mg/g
wet weight in brain to 30.1 mg/g
in fur. Mean (range) total Hg concentration
(N=316) in liver was 3.71 (0.07-44.1) mg/g
when both trapping seasons were pooled. Log liver total Hg
concentrations increased with age and were greatest in areas
with moraine deposits and closest to local industrial centers.
Log liver total Hg
concentrations were low in areas with rich clay deposits and areas
furthest from local industrial centers. |
20. |
In
1994, 19 mink were selected from 800 collected in Ontario, Canada (Evans
et al., 2000). Mean
(standard deviation) total Hg
concentrations were 0.34 (0.24) mg/g
wet weight in brain, 1.01 (0.92) mg/g
in kidney, 1.53 (1.24) mg/g
in liver, and 17.26 (12.50) mg/g
in fur. Mean (standard deviation) MeHg
concentrations were 0.26 (0.19) mg/g
wet weight in brain, 0.94 (0.86) mg/g
in kidney, 1.21 (0.85) mg/g
in liver, and 11.25 (8.01) mg/g
in fur. |
21. |
Mercury was detected in hair samples taken
from the abdominal and caudal regions of all 12 adult mink collected
from four sites at the Oak Ridge Reservation, Tennessee (Stevens et al.,
1997). Mean concentrations were 104.0, 11.0, and 8.80 µg/g dry weight
at the contaminated sites and 5.15 µg/g at reference sites. |
IV. |
Petroleum |
|
No
residue data available |
V. |
Other |
1. |
In
1974 and 1975, farm mink, ages 10 to 12 weeks were put in groups of 2
males and 8 females and fed 0, 1, 2.5, 6.25, or 15.625 ppm polybrominated biphenyls (PBBs)
mixed into mink feed, or 1.54 or 11.98 ppm PBB
obtained from mixing PBB
contaminated poultry or beef, respectively, into mink feed(Aulerich and
Ringer 1979). PBB
was found at 60 times the dietary concentration in the adipose tissue.
Average PBB residues
in brain, skeletal muscle and adipose tissue of control minks were 0.14,
0.73, and 8.14 ppm. Range
of average PBB residues in
brain, skeletal muscle, and adipose tissue of treated minks was
1.5-94.6, 7.3-71.6, and 91.2-986 ppm.
|
Mink
Contaminant Response Data |
|
I. |
Organochlorine Contaminants |
1. |
Fish
seined from the Southwest Miramichi River in New Brunswick in 1967 were
incorporated into commercial mink diets, resulting in DDE
levels of 0.58 and 0.42 ppm (in feed) for two experimental groups
(Gilbert, 1969). Mink fed this diet exhibited higher levels of DDE
in liver and adipose tissue than controls. Experimental animals also had
reduced erythrocyte and leukocyte counts, hemoglobin and hematocrit, and
a higher pH of the blood. Adrenal, spleen and testes weights were all
elevated, and females had significantly greater embryonic loss. Sex
ratio of litters was weighted in favor of females in treated groups. |
2. |
Male
and female mink were fed diets containing fish from Lake Michigan and
Lake Erie prior to and throughout breeding (Aulerich et al., 1971). All
females fed Lake Michigan coho salmon experienced complete reproductive
failure, and all mink died by the end of the whelping period. Those fed
Lake Michigan bloater chub, Lake Michigan yellow perch, and Lake Erie
coho also exhibited reduced numbers whelping, decreased kit weight, and
poor kit survival. Pesticide levels appeared to be related to degree of
reproductive decline or mortality. Total DDT
levels of Lake Michigan coho, Lake Michigan chub, Lake Michigan perch,
and Lake Erie coho were 18.23 µg/g, 8.81 µg/g, 3.34 µg/g, and 2.76 µg/g,
respectively, and dieldrin
concentrations were 0.118 µg/g, 0.149 µg/g, 0.061 µg/g, and 0.031 µg/g,
respectively. |
3. |
The
effect of DDT on
reproduction in mink was studied (Duby et al., 1971). o,p'-DDT was confirmed to be uterotrophic.
When injected with either o,p'-DDT, p,p'-DDT or technical DDT, there were no indications of any effect on
either fertility or fecundity. |
4. |
In
order to examine the effect of PCBs
on reproduction, mink were assigned to a control group and fed a basal
high protein meat diet, or fed the basal diet containing coho salmon
from Lake Michigan, or fed the basal diet plus a supplement containing
10 ppm of the following PCB aroclors:
1242, 1248, and 1254
(Ringer et al., 1972). All of the mink fed diets supplemented with Aroclors
died prior to whelping. Six of the 15 fed the coho salmon died prior to
the end of the experiment, but none of the control died. Tissue analysis
revealed that the PCBs were
most concentrated in the brain at a mean of approximately 11 µg/g. In a
second experiment, mink were fed PCBs
at either 5 or 10 ppm and in combination with either 10 ppm of DDT
or 0.5 ppm of dieldrin. All
treatment groups gained less weight and had a higher percent mortality
than the control group. Mortality was 100% in mink feed 10 ppm of PCB
plus 0.5 ppm of dieldrin. |
5. |
Prior
to and during breeding, mink were fed a diet containing either 0.64 or
3.57 ppm Aroclor 1254
derived, in part, from cows injected with the PCB
(Platonow and Karstad, 1973). Reproductive failure occurred in all
females, and death occurred in all mink fed the 3.57 ppm diet. Gross
lesions observed were yellowish discoloration of the liver and
hemorrhage into the abdominal cavity or gastrointestinal tract.
Microscopic lesions included nephrosis, fatty degeneration and necrosis
of the liver, brain edema, disseminated intravascular coagulation and
fibrosis of coronary arteries. |
6. |
A
significant decrease in reproductive success was observed when mink were
fed coho salmon collected from Lake Michigan in 1968 (Aulerich et al.,
1973). Out of 14 control mink that were fed ocean perch and mated, 13
whelped. In the treatment group fed coho salmon, no whelping occurred in
8 mink that mated. No decrease in whelping occurred when the mink were
fed coho salmon from the west coast. Kit mortality greater than 50% was
observed when mink were fed fish from the Great Lakes. Mink fed fish
from the Great Lakes exhibited signs of toxicity similar to those whose
diet contained PCBs. The mink fed a diet containing 30% coho salmon from
Lake Michigan acculumated PCBs
in tissues, with greatest residues in brain (11.07 µg/g). |
7. |
Feeding
studies conducted to investigate reproductive effects of PCB
to mink, including those reported in Aulerich et al, 1971 and 1973, are
further described (Aulerich and Ringer, 1977). In 1971-72, a study was
initiated to examine long-term effects of PCBs
interacting with dieldrin
and DDT. Results indicated that 10 ppm Aroclor
1254 depressed weight gain in young mink. All mink fed Aroclor
1254 plus 0.5 ppm dieldrin
died by the end of the experiment, only one of six survived the diet of Aroclor
alone, and 4 of 6 survived of those fed Aroclor
plus 10 ppm DDT. All mink
failed to produce offspring. Enlargement of the liver, kidneys, and
heart was observed. In the 1972-73 study, four Aroclors
(1016, 1221,
1242, 1254) were fed to mink throughout the breeding season, but
only Aroclor 1254 resulted
in an adverse reproductive effects (0.3 kits whelped per female). Acute
toxicity (LD50) was estimated for Aroclors
1221, 1242, and 1254,
and was found to vary inversely with chlorine content of the Aroclors.
In a final study, females fed PCBs
or Lake Michigan salmon that failed to whelp young were placed on
control diets; they were found to successfully produce offspring in the
following breeding season. |
8. |
Female
mink exposed to 3.3 ppm PCB
plus 3.3 ppm DDT, 11 ppm PCB
alone, or 0.05 ppm PCB
("controls") for 66 days were mated with untreated males
(Jensen et al., 1977). Liver weights were higher in treated groups
compared to controls. The number of implantation sites in breeding
females was not different among groups, but the number of delivering
females and the number of kits born per female significantly decreased
in the 3.3 ppm group. No kits were delivered in the 11 ppm group.
Concentrations of hepatic cytochrome P450 were significantly higher for
both treatment groups. |
9. |
Mink
fed a diet of 11 ppm PCB (Clophen
A50 and A60) for
66 days were analyzed for Cd
and Hg concentrations
(Olsson et al., 1979). Concentrations of Cd
in PCB-treated animals were
higher than those found in the control. Concentrations of
Hg showed no significant difference between groups. |
10. |
Mink
were divided into treatment groups and fed either 0, 5, 10, 20, or 40
ppm Aroclor 1242 or 20 ppm Aroclor
1016 prior to and throughout the breeding season (Bleavins et
al., 1980). Total mortality occurred in 20 and 40 ppm Aroclor
1242 groups, and in 66.7% of the 10 ppm group. Aroclor
1016 produced mortality in 25% of individuals. Mink fed all
levels of Aroclor 1242
exhibited total reproductive failure with no mink whelping. Mink fed Aroclor
1016 had a 44.4% whelping rate and kits had a significantly
lower body weight at 4 weeks. |
11. |
Male
and female mink were either placed in a control group, or fed 20 ppm of Aroclor
1016 or 1242
for 28 days (Shull et al., 1982). Liver weight tended to be 5-15%
greater in both males and females fed 1016
or 1242 compared to control
mink. Cytochrome P450 was significantly greater in mink fed Aroclor
1242 compared to controls.
In another experiment, mink received intraperitoneal injections of
Aroclor 1242; hepatic cytochrome P450 and benzo(a)pyrene activity
increased compared to controls. |
12. |
On
three consecutive days mink were injected with either phenobarbital
(PB) or 3-methylcholanthrene
(MC) (Shull et al., 1983).
After each injection with PB,
mink were lethargic and the amount of time they slept was greater on day
3 compared to the first day. An increase of 36% in liver weight and 29%
in lung weight was observed. After injection with MC,
food consumption decreased and decreases in body weight (11%) and liver
weight (21%) were observed. There was no difference in microsomal
protein or in NADPH-cytochrome P450 reductase between control mink and
those injected with PB or MC.
A significant increase in cytochrome P450 (448) was observed for the PB-
and MC-injected mink. There
was no difference in Cytochrome b5 for the PB-injected mink but an increase was observed for the MC
injected mink. When examining specific hepatic microsomal MFO activity,
it was found that aminopyrine N-demethylase activity increased
significantly over controls for the PB-treated
mink, and benzo(a)pyrene hydroxylase and ethoxyresorufin-O-deethylase
activities increased significantly in the MC-injected
mink compared to controls. |
13. |
One
group of female mink was fed a diet supplemented with 0, 1, 5, or 25 ppm
HCB and tested for
mitogenic lymphocyte blastogenesis response, and a second group was fed
a diet of 0, 1, or 5 ppm HCB
and mated (Bleavins et al., 1983). Mink fed the 25 ppm diet showed no
physical signs of distress or toxicity, but exhibited reduced
blastogenic response to the Concanavalin A mitogen. Kits born to and
nursed by mink at both the 1 and 5 ppm level and fed non-HCB-supplemented
feed also exhibited a reduced T-cell response to the Concanavalin A
mitogen. |
14. |
Kits
born to male and female mink exposed to concentrations of 0, 1, and 5
ppm HCB were sacrificed at
16-17 weeks and examined (Rush et al., 1983). Kit mortality to weaning
increased from 8.2% in control to 44.1 and 77.4% in the 1 and 5 ppm
groups, respectively. Surviving kits showed no change in body weight,
liver weight or kidney weight. None of the kits had altered cytochrome b5
levels, but those from the 5 ppm group had elevated hepatic cytochrome
P450 concentration and ethoxyresorufin-O-deethylase
activity. No changes were observed in ethoxycoumarin-O-deethylase,
benzphetamine-N-deethylase, NADH cytochrome-c
reductase, or in vitro
renal function. No hepatic damage was observed. Tetraethylammonium
accumulation was significantly decreased in 5 ppm kidneys. HCB
was detected primarily in the fat at a mean concentration of 0.63 µg/g
for the 5 ppm group, but also detected in the brain, liver, kidney, and
muscle. |
15. |
In
a study conducted from 1979-80, mink were divided into 6 dietary groups
and fed fish from the Great Lakes (carp, white sucker, perch, whitefish,
or alewife) or a control diet of Atlantic cod, haddock, and flounder (Hornshaw
et al., 1983). No difference in weight gain was observed between the
control groups and any of the treatment groups. None of the kits were
whelped alive in the group fed carp. The percent kit survival from birth
to four weeks tended to be lower in all treatment groups compared to the
control, though there were no significant differences found in
reproduction. In the second year, two groups of minks were studied:
those fed a standard mink diet of marine fish and those fed a mix of
perch scraps and sucker from the Great Lakes. A significant drop in the
number live whelps was seen for the Great Lakes-fed group when compared
to controls. PCB residues
(as Aroclor 1254), measured
in both studies, accumulated in subcutaneous body fat as much as 38
times the dietary level, with individual congeners accumulating up to
200 times. The half-life of PCB
in adipose tissue was found to be 98 days. |
16. |
Adult
mink were fed HCB in
concentrations of 1, 5, or 25 ppm for 47 weeks (Bleavins et al., 1984).
Adult mink in all dosage groups showed significantly elevated levels of
hypothalamic seratonin, with no effect on regional brain norepinephrine
or dopamine concentrations. Young mink exposed to HCB in utero
and during lactation exhibited a significant decrease in hypothalamic
dopamine levels at the 1 and 5 ppm concentrations, with no effect on
regional brain concentrations of serotonin or norepinephrine. |
17. |
Adult
female mink were fed diets supplemented with 2.5 ppm Aroclor
1254, 0.1 or 0.5 ppm PCB
congener 169, 2.5 or 5.0 ppm
PCB congener 153, or 2.5 or 5.0 ppm
PCB congener 136 (Aulerich et al., 1985). Congener
169 caused total mortality within 60 days at 0.5 ppm, and 50%
mortality within 90 days at the 0.1 ppm level. No adverse reproductive
effects were seen in the congener 153
or 136 groups, while the Aroclor
group resulted in a single stillborn kit whelped. Plasma progesterone
concentrations showed a significant increase in the 0.1 ppm congener
169 group, and a significant decrease in those fed Aroclor. All mink, excluding those fed congener
136, showed a significant increase in hepatic cytochrome P450
concentration, the greatest occurring with Aroclor
and congener 169.
Benzo(a)pyrene hydroxylase activities increased significantly with Aroclor,
congener 153 and 169.
Ethoxyresorufin-O-deethylase activities increased significantly in those
fed Aroclor. Norepinephrine concentrations were increased by Aroclor,
congeners 136 and 153,
and dopamine levels were effected by Aroclor
and congener 169.
Concentrations of 17ß-Estradiol were not significantly altered. |
18. |
At
the Michigan State Experimental Fur Farm, in 1981 and 1982, HCB
was added to mink food at 0, 1, 5, 25, 125, and 625 ppm and fed to
groups consisting of 10 females and 3 males for each dose (Bleavins et
al., 1984b). Mean number of kits whelped/number of alive kits for 0, 1,
5, 25, 125, and 625 ppm treatment groups, respectively, were 6.4/4.9,
5.3/4.3, 5.9/5.3, 3.4/1.9; the 25 ppm groups had significantly fewer
total kits (p<0.05) and alive kits (p<0.01) than the control
group. Number of kits/mean
kit body weight (g) at birth, 3 weeks, and 6 weeks, for the 0, 1, 5, and
25 ppm treatment groups, respectively, were: 49/9.0, 45/97, 45/245;
34/7.9, 23/87, 19/229; 53/8.1, 12/68, 12/173; and 15/7.6, 2/36, 2/71.
The 5ppm and 25 ppm groups had significantly lower body weight at
all times measured than the control group, and the 1 ppm group had
significantly lower weight at birth (p<0.01).
The 5 ppm group had significantly lower biomass than the control
group (145g compared to 441g, p<0.05).
In the 125 and 625 ppm groups, all mink died.
Survival ranged from 18-79 days for males and 9-266 for females.
In
a concurrent experiment, mink were fed 0 or 2.5 ppm HCB; kits were cross-fostered between treatments.
Male kits born to control mink and fostered by HCB
treated mink had significantly greater body weight at 6 weeks (340g
compared to 297g in control mink, p<0.05).
Female kits in the HCB
group raised by their own mother had significantly greater body weight
at 3 weeks (105g compared to 94g in the control, p<0.05).
Kit mortality at 3 and 6 weeks ranged from 3.0% to 22.5%, but did
not differ among groups. |
19. |
Two
LC50 trials were conducted to assess primary and secondary
toxicity of Aroclor 1254 in
mink (Aulerich et al., 1986). Primary toxicity tests (Aroclor
1254 mixed into feed) yielded LC50 estimates of
79.0 ppm and 48.5 ppm for 28- and 35-day tests, respectively. The 35-day
test included a 7-day withdrawal period. LC50 values for
individuals fed the metabolized PCB
(i.e., secondary toxicity; Aroclor
1254 fed initially to rabbits, and then rabbit is
incorporated into the diet of the mink) in concentrations equal to that
of the unmetabolized PCB
were 47.0 and 31.5 ppm for the two durations. Food consumption and body
weight gain means were lower for minks in the secondary toxicity test.
The findings indicate the potential for enhancement of toxicity upon
metabolism of some halogenated hydrocarbon mixtures. |
20. |
Three
28-day dietary Aroclor 1254
trials were conducted to assess the effects of age, dietary
compositions, and season/year on LC50 estimates (Hornshaw et
al., 1986a). Males and females in all groups exhibited increased weight
loss with increased dietary concentrations of the PCB
mixture. Males demonstrated significant weight loss at concentrations >
18.0 ppm and greater, and females at levels of >32.4 ppm.
Little effect was found between the three tests of age, diet, and
season/year. Dietary LC50 values were 83, 84, and 79 ppm,
respectively. After a 7-day withdrawal period (untreated diet
substituted), mink continued to succumb and LC50 estimates
became 58, 47, and 49 ppm. |
21. |
Mink
received three daily injections of either PCB
congener 47 or congener 77,
and were sacrificed after 7 days (Gillette et al., 1987). Those
receiving the congener 77
showed a significant decrease in food consumption and body weight, and
an increase in cytochrome P450 levels and microsomal epoxide hydrolase
activity. No change in activity was exhibited by either group for
cytochrome b5, NAPDH cytochrome c reductase, ECOD, AHH, APND,
or aldrin epoxidase. Mink fed congener
77 exhibited abnormalities of the small intestine. Liver
concentration of congener 77
was 11.5% of body fat concentration. No effect was seen in organ weights
of either group. |
22. |
Mink
diets were supplemented for 135 days with either 0.01 or 0.05 ppm PCB
congener 169 (Aulerich et al., 1987a). Exposure to 0.05 ppm
resulted in 50% mortality, while no deaths occurred in the 0.01 ppm
group. The 0.05 ppm group showed significant body weight loss after two
months of feeding, as well as abnormal molt, deformed nails, anorexia,
and bloody stools. Organ weights were significantly greater than
controls for the brain, liver, kidneys, and adrenals in the 0.05 ppm
group, and for the liver alone in the 0.01 ppm group. Free and total T3
concentrations were significantly decreased in both groups, and T4
levels were reduced in the 0.05 ppm group. |
23. |
Eighty-four
ranch-bred mink were separated into four treatment groups and one
control group, and fed commercial mink food supplemented with one of the
following treatments: 1.0 ppm PCB
(Aroclor 1254), 1.0 ppm MeHg,
1.0 ppm PCB plus 1.0 ppm MeHg,
0.5 ppm PCB plus 0.5 ppm MeHg
(½MeHg/PCB group), or no
toxicant (Wren et al., 1987a). Liver PCB concentrations were consistently the highest for the PCB
only group in adult mink. Levels in 5-week-old kits were highest in the
½Hg/PCB group (<2.42 µg/g)
as compared to the PCB only
group (<1.82 µg/g) and approximated levels of adult mink fed the
experimental diets for over 7 months. No significant differences were
found of the test groups in examination of the thyroid gland, pituitary
gland, adrenal gland, or serum T4 or T3 levels. |
24. |
Eighty-four
ranch-bred mink were separated into four treatment groups and one
control group and fed commercial mink food supplemented with one of the
following treatments: 1.0 ppm PCB
(Aroclor 1254), 1.0 ppm MeHg,
1.0 ppm PCB plus 1.0 ppm MeHg,
0.5 ppm PCB plus 0.5 ppm MeHg
(½MeHg/PCB group), or no
supplement (Wren et al., 1987b). Kits nursed by mothers exposed to 1.0
ppm PCB had significantly
reduced growth rates. Kits with mothers in the PCB/MeHg group had a significantly lower rate of survival to
weaning. There was no significant difference in female fertility,
percentage of females whelped, or number of kits born. |
25. |
Newborn
mink were separated into six groups and administered daily 0.1 µg TCDD/kg
body weight, 1 µg TCDD/kg
body weight, 10 µg epidermal growth factor (EGF)/kg body weight, 50 µg
EGF/kg body weight, a 1:9 acetone/corn oil mixture (TCDD
vehicle), or 0.85% sodium chloride (EGF vehicle) for twelve consecutive
days (Aulerich et al., 1988). Doses of 1 µg TCDD/kg
body weight were lethal to all test subjects within two weeks. Those
treated with 0.1 µg TCDD/kg
body weight showed significant body weight reduction by two weeks for
males and three weeks for females. Mortality in this group continued
after dosing and was 62% by the 19th week. Significant weight
reductions first occurred in both EGF groups in the second week in both
males and females. Mortality occurred mainly during the dosing period in
these groups. Days to eyelid opening was significantly reduced from a
mean of 34.2 days in control to 27.4 days in the 10 µg EGF group and
15.1 days in the 50 µg EGF group. Eyelid opening was not significantly
different in the TCDD groups, nor was incisor or premolar eruption for any of
the test groups. |
26. |
Sixteen
adult mink were administered a single oral dose of TCDD in concentrations of 0, 2.5, 5.0, or 7.5 µg/kg body
weight (Hochstein et al., 1988). A 28-day LD50 value of 4.2
µg/kg body weight was determined. Food consumption decreased
significantly in the first week for the 5.0 and 7.5 µg/kg groups,
increasing in the third week for survivors. Body weight was
significantly lower in the survivors of the 2.5 µg/kg group and
individuals that died in the 5.0 and 7.5 µg/kg groups. A significant
increase in weight occurred in the kidneys and brains of 5.0 and 7.5 µg/kg
dosed mink, in the heart of the 5.0 µg/kg animals, in the thyroid
glands of the 7.5 µg/kg group, and in the adrenal glands of all test
groups. No significant weight increase occurred in the liver or spleen,
though gross necropsy revealed mottling and discoloration of these
organs as well as the kidney. |
27. |
Female
mink were exposed to 1 ppm Aroclor
1254 from two weeks after breeding until whelping, for a
period totaling approximately 45 days (Hunter, 1991). This exposure
resulted in reduction of the cervical apocrine gland in kits, with
greatest effect in the first two weeks of life, and reduction of the
area of epithelial cell cytoplasm. |
28. |
To
evaluate potential biomarkers of contaminant exposure, mink were divided
into five groups and fed the following diets: 40% ocean fish, 10%
Saginaw Bay fish (SBC), 20% SBC, or 40% SBC (Melancon et al., 1992).
EROD, ECOD, AHH, and cytochrome P450 IA activity were found to
significantly increase over the control values. PROD was found to
significantly decrease over control values. |
29. |
Mink
fed daily doses of PCBs or PCB
fractions during mating and gestation had higher urinary cortisol
excretion at the time of embryonic implantation than controls (Madej et
al., 1992). Urinary excretion of estrone sulfate increased later in test
groups than control, yet occurred at higher levels at the time of
parturition. |
30. |
Reproductive
outcomes of female mink receiving daily doses of commercial PCBs
or PCB fractions were
studied (Kihlström et al., 1992). Litter size and number of live whelps
were decreased with administration of Clophen A50 or Aroclor 1254,
in daily doses of 2 mg and 1.64 mg, respectively. Implantation rate did
not decrease. The frequency of interrupted pregnancies, as well as liver
weights increased. Similar results occurred with mink given combinations
of two or more CB fractions, yet not for mink exposed to single
fractions separately. Individuals given the single fraction containing
the bi- and tricyclic contaminants polychlorinated
naphthalene and PCDF
showed significantly higher number of live whelps and an increased
survival rate. |
31. |
Adult
mink fed daily doses of Clophen A50,
PCB fractions containing 0-
or 1-ortho-CBs,
or the synthetic mixture of congeners
77, 126 and 169
exhibited EROD activities that were increased two- to threefold compared
to controls (Brunström 1992). Studies of Aroclor
1254 and mixtures of four fractions prepared from Aroclor
1254 also revealed an approximate twofold increase of AHH
activity in adult mink. Kits born to females exposed to the 0-
or 1-ortho-CBs
showed a 30-fold increase of EROD levels. In a third study, EROD, AHH,
and APND activities were increased 1.6 to 2.7 times in females fed Aroclor
1254 daily one month before mating. |
32. |
Mink
fed PCB and PCB
fractions were examined for evidence of change in Vitamin A
concentration in the liver, kidney, and lungs (Håkansson et al., 1992).
Exposure to Clophen A50 and
Clophen fractions
containing non- or 1-ortho-CBs
resulted in a 48 to 67% decrease in hepatic and pulmonary Vitamin A
content, but no observable renal decrease. Aroclor
1254 induced no change in Vitamin A tissue levels, however
fractions containing 2 to
4- and
1-ortho-CBs
showed a significant reduction in pulmonary levels. |
33. |
The
retention of CBs and the
lipophilic MeSO2-CB
was studied in mink treated with a wide variety of PCBs
and PCB fractions for
three months during pregnancy (Bergman et al., 1992a). Concentrations
determined from muscle showed a significant increase of the body burden
of CBs and metabolites in
animals exposed to CBs
fractions containing 2-4-ortho
CBs or 1-ortho
CBs. The most efficiently retained CBs
were those that contained 5 or more chlorine atoms and lacked vicinal
hydrogens in 3,4-positions. Those most easily metabolized were CBs with chlorine atoms in 2,5-positions and unsubstituted
3,4-positions. The CBs/ MeSO2-CBs
ratio was calculated and determined to be slightly lower in the liver
than in the muscle samples. |
34. |
Biochemical
parameters in blood and urine were examined in mink fed commercial PCB
and CB fractions for a
total of 53-69 days during the periods before and after mating (Edqvist
et al., 1992). Mink fed PCBs
exhibited elevated alanine aminotransferase. Lowered alkaline
phosphatase resulted from exposure to PCB
or CB fractions. Mink
exposed to PCB or 2-4-ortho+1-ortho+0-ortho
and 2-4-othro+0-ortho
showed lower serum bile acids. Some of the observed biochemical changes
were counteracted by the presence of bi- and tricyclic contaminants.
Urinary parameters exhibited no significant change. |
35. |
Liver
histology was studied in female mink receiving daily doses of commercial
PCBs or PCB
fractions (Bergman et al., 1992b). Effects included fatty changes in
hepatocytes, hemosiderosis of Kupffer cells, and increased frequency of
polymorphonuclear and mononuclear cells in groups exposed to commercial PCBs,
those in 3 and 4 combination fractions, and 2-4-ortho
and 0-ortho
CBs. Of those mink treated in combination, exposure to 2-4-ortho
and 0-ortho
CBs were least affected. No effects were observed in the
group exposed to bi- and tricyclic contaminants. |
36. |
Female
mink receiving daily doses of commercial PCBs
or PCB fractions (1-ortho,
0-ortho,
and
2-4-ortho CBs,
and bi- and tricyclic contaminants) were examined for morphological
changes of the reproductive organs (Bäcklin et al., 1992). High
incidences of fetal death occurred among groups exposed to commercial PCBs and combinations of their fractions. Those exposed to
single PCB fractions
incurred no increase in fetal death. Females fed Clophen
A50 had a high predominance of late fetal death and had
ovaries containing corpora lutea. Mink exposed to Aroclor
1254 experienced a high frequency of early fetal death and
had ovaries containing corpora albicantia. |
37. |
Mink
were fed heptachlor at 0,
6.25, 12.5, or 25 ppm for 180 days (Crum et al., 1993). Mortality of the
female mink was directly related to dose. No mink died in the control (0
ppm) group and 100% died in the 12.5 ppm group. Heptachlor
at the 6.25 ppm concentration did not alter the litter size, the number
of kits whelped or the percent of kits alive at birth compared to the
control group, but there was a decline in these parameters in the 12.5
ppm group. Kit weight at 3 week and 6 weeks was significantly lower in
the 6.25 and 12.5 ppm group when compared to the controls. Heptachlor
at 6.25 and 12.5 ppm did not affect male reproduction. |
38. |
Beginning
in 1992, mink in the lab were dosed three times a week for 18 months
with either 0.7 mg Clophen A50 (0.3 mg/day PCB),
0.24 mg Clophen A50 (0.1
mg/day PCB, fraction of Clophen
A50 containing 0-1-ortho-CBs
and dicyclic aromatic contaminants, fraction of Clophen A50 containing 2-4-ortho-CBs,
blubber extract containing organochlorine pollutants (0.064 mg total PCB and 0.021 mg
total DDT/day), or 1 ml of fish oil (Brunström et al.,
2001). In
the first season, mink exposed to the 0.3 mg/day PCB
dose had decreased birth weights of young and reduced viability of
offspring. The 0.3 mg/day PCB
and 0-1-ortho-CB
dosed mink had decreased thymus weights. In the second season, 39% of
the 0.3 mg/day PCB dosed
females and 93% of the control group produced offspring. All offspring
from the 0.3 mg/day PCB
dosed females died within one day.
The 0.1 mg/day PCB group had decreased kit survival (only 36%
survived to two weeks versus 73% in the control group) and decreased
offspring body weights at 2 and 5 weeks of age.
In both seasons, abnormalities in stillborn kits were higher in
the 0.3 mg/day PCB group compared to the control group.
The 0-1-ortho-CB
fraction dosed group had fewer kits per female and a two-week survival
rate of only 7%. Growth rate and kit production were not affected by the
2-4-ortho-CB
fraction dose, but had a lower two-week survival than the control group. Hepatic
PROD and EROD activities increased with PCB
dose. PROD induction also occurred in the 2-4-ortho-CB
dose. Both fractions induced EROD. The blubber extract contaminants
strongly induced PROD and slightly induced EROD. |
39. |
Sixty
mink were fed diets consisting of 0, 10, 20, or 40% carp collected from
Saginaw Bay, Michigan, prior to and throughout the reproductive period
(Heaton et al., 1995). The resultant diets contained 0.015, 0.72, 1.53,
and 2.56 mg PCB/kg diet or
1.03, 19.41, 40.02, and 80.76 ng TEQs/kg
diet, respectively. Food consumption was inversely proportional to
percentage of carp in the diet. Mink fed the 40% diet exhibited signs of
PCB intoxication including parental inattentiveness in
females. The 40% group resulted in a significantly lower number of kits
whelping, with all born stillborn or dying within 24 hours. Kit weight
and survival to weaning was inversely proportional to percent of carp in
diet. A dose-related decrease was measured in relative organ weights of
the liver, spleen, kidney, lung, adrenal gland, and heart in 6-week-old
kits, with the 20% group showing significantly greater adrenal gland
weights. Adult mink showed a general dose-dependant increase of all
relative organ weights. Lowest observable adverse effect levels of 0.134
mg PCBs/kg body weight/day
or 3.6 ng TEQs/kg body
weight/day for adult female mink were determined. |
40. |
Sixty
mink were fed diets consisting of 0, 10, 20, or 40% carp collected from
Saginaw Bay, Michigan, prior to and throughout the reproductive period (Tillitt
et al., 1996). The resultant diets contained 0.015, 0.72, 1.53, and 2.56
ppm PCB or 1.03, 19.41,
40.02, and 80.76 ng TEQs/kg
diet, respectively. Examination of dietary or tissue-based exposure of
the mink to TCDD showed
that TCDD equivalents of
the planar halogenated hydrocarbon
mixtures followed an additive model of toxicity, as compared with the
H4IIE bioassay. The 10% treatment group (19.4 pg H4IIE bioassay-derived TCDD-EQs/g)
exhibited significant reproductive effects. Consumption-normalized mink
liver biomagnification factors were 6.4-74.2 for PCDDs,
<1-75.8 for PCDFs,
<1-15.9 for PCBs, and
generally increased with degree of chlorination in each class. |
41. |
Prior
to and throughout the reproductive period, male and female mink were fed
diets partially composed of Saginaw Bay (Lake Huron) carp formulated to
provide 0 (control), 0.25, 0.5, or 1.0 ppm PCB
(Restum et al., 1998). After whelping of offspring, half of the treated
mink were switched to the control diet for the next reproductive cycle
and half remained on their respective treated diets. All kits born in
the first reproductive cycle were maintained on their parents’ diet
through weaning, after which time half were switched to the control
diet. Breeding performance of females was adversely affected with
increased PCB dietary concentration as evidenced by reduced vulvar
swelling and delay of mating. Kit body weights at birth for both
generations were generally inversely proportional to concentration of PCB
in the diet, and survival was significantly lower for those continually
treated with 1.0 ppm PCB. In mink continually exposed to 1.0 ppm PCB,
serum T4 concentrations were significantly greater than
controls for adults of both sexes and serum T3 was greater in
adult males and female kits. Organ weights were affected by continuous
feeding at concentrations of 0.5 ppm or higher in adults and 0.25 ppm or
greater in kits. Those continuously fed at the 1.0 ppm level had
significant weight differences in the kidney, liver, brain, spleen,
heart and thyroid glands. The percentage of livers in with periportal
hepatocellular lipidosis and diffuse hepatocellular lipidosis tended to
increase with increased exposure to PCBs. |
42. |
Prior
to and throughout the reproductive period, male and female mink were fed
diets partially composed of Saginaw Bay (Lake Huron) carp formulated to
provide 0 (control), 0.25, 0.5, or 1.0 ppm PCB
to determine its effect on hepatic cytochrome P-450 induction (Shipp et
al., 1998a). After whelping of offspring, half of the treated mink were
switched to the control diet for the next reproductive cycle and half
remained on their respective treated diets. All kits born in the first
reproductive cycle were maintained on their parents’ diet through
weaning, after which time half were switched to the control diet. Adults
were sacrificed after the second reproductive cycle and kits at six
weeks of age. In general, hepatic EROD activity increased with
increasing PCB consumption.
Hepatic EROD activity was significantly higher in mink continuously fed
diets containing PCBs, but
activity in mink switched to control diets was not significantly
different than controls. |
43. |
Prior
to and throughout the reproductive period, male and female mink were fed
diets partially composed of Saginaw Bay (Lake Huron) carp formulated to
provide 0 (control), 0.25, 0.5, or 1.0 ppm PCB
to determine its effects on the binding sites for ovarian steroid
hormones (Shipp et al., 1998b). After whelping of offspring, half of the
treated mink were switched to the control diet for the next reproductive
cycle and half remained on their respective treated diets. All kits born
in the first reproductive cycle were maintained on their parents’ diet
through weaning, after which time half were switched to the control
diet. In the parental mink, hepatic estrogen sites showed a
dose-dependent decrease for mink continuously fed treated food, yet no
significant difference from controls in those switched to the control
diet. Kits produced in the first reproductive cycle showed no difference
in hepatic estrogen sites whether the diet was continuously treated or
switched. Kits produced in the second reproductive cycle from both the
parental and first filial generation tended to show decreased hepatic
estrogen sites with increasing PCB exposure on both continuous and switched diets, though
the low number of surviving mink made statistical significance difficult
to attain. Uterine estrogen binding sites and uterine progesterone
receptor concentration was not significantly altered by inclusion of PCBs
in the diet in any form. |
44. |
Female
mink were given diets containing a low, high, or no dose of Clophen
A and mated with unexposed males (Bäcklin et al., 1998).
Exposed females received 0.65 mg PCBs
per day for 54 days (total exposure=35.1 mg) or 1.3 mg per day (total
exposure=70.2 mg). Uteri of
treated mink exhibited a greater percentage of implantation sites that
were degenerate or contained dead fetuses, in a dose-dependant manner.
In implanted mink, there was no difference between treated and
control animals in the number of implantation sites, though there were
fewer mink with implantation sites in PCB-exposed
groups. Fetal death was
also markedly increased in treated groups.
Histological examination revealed effects of PCBs
to maternal vasculature and degenerative changes in the trophoblast and
fetal vessels. |
45. |
Juvenile
mink (N=8) collected from four locations in British Columbia during the
winters of 1994-1995 and 1995-1996 were found to have a significant
negative correlation between baculum length and hepatic PCB concentrations (Harding et al., 1999).
|
46. |
Fatty
acid composition was measured in adipose tissue surrounding the lymph
nodes in male and female minks fed control diets of freshwater and
marine fish and similar diets laced with 1 mg PCBs
or 1 mg PCBs and 62 mg Cu/kg
diet (Käkelä and Hyvärinen, 1999).
Exposure to PCBs
caused alterations in fatty acid of phospholipids, especially in females
fed freshwater fish. Slight
but statistically significant alterations in fatty acid composition
triacylglycerols were noted in mink fed marine fish.
The magnitude of fatty acid changes in the PCB-Cu
group was midway between the changes observed in the PCB and control groups. |
47. |
Vitamin
levels were measured in liver, adipose tissue, and plasma in male and
female mink fed control diets of freshwater and marine fish and similar
diets laced with 1 mg PCBs
or 1 mg PCBs and 62 mg Cu / kg diet (Käkelä et al., 1999).
Exposure to PCBs caused decreases in hepatic vitamin A2 in
both sexes on the freshwater diet, and decreases in hepatic vitamin E in
males. Exposure to PCBs
increased levels of vitamin A1 in adipose tissue of minks fed
the freshwater diet, but decreased the level of A1 in the
adipose of minks fed the marine diet.
PCBs also lowered
the level of vitamin E in the adipose of minks on the freshwater, but
not marine, diet. The
combination PCB-Cu diet
caused no effect in vitamin levels of liver or adipose in any group.
All treatment groups experienced a decrease in plasma vitamin A1
and A2 to 50% the control values. Thyroxine concentration in
plasma was increased slightly by PCBs
and by the PCB-Cu diet. |
48. |
For
one year, mink were fed diets containing mixtures of methylsulfonyl-PCBs and 3-methylsulfonyl-DDE
based upon concentrations found in blubber from adult unstarved female
Baltic gray seals, and then mated (Lund et al., 1999). Treated females exhibited no signs of toxicity or effect on
overall body weight, though kidney weight decreased by 15%.
Hepatic PROD exhibited 11-fold induction and hepatic progesterone
a 2-fold induction in treated females, which also experienced a 30-35%
decrease in plasma TT3 and TT4 concentrations.
Treated females exhibited a 50% increase in litter size and
number of liveborn kits, though birth weight was 20% lower than controls
and 2-week survival was only 47% compared to 73% in controls.
Five-week-old kits did not show signs of toxicity, though hepatic
PROD activity was induced fivefold.
The mean total concentration of PCB
and DDE methyl
sulfones in muscle of exposed adults was 18 µg/g lipid
weight. |
49. |
From
1993-1994, captive mink at Michigan State University Experimental Fur
Farm were fed fish from Poplar Creek in the Oak Ridge Reservation,
Tennessee, as well as from two reference sites, Clinch River above the
ORR, and the Atlantic Ocean (Halbrook et al. 1999). Five groups of 8
female and 2 male mink were housed outdoors in individual cages and fed
diets with the following combination of fish mixed with mink chow: 75%
ocean fish (diet A), 75% Clinch River fish (diet B), 25% Poplar Creek
fish and 50% ocean fish (diet C), 50% Poplar Creek fish and 25% ocean
fish (diet D), and 75% Poplar Creek fish (diet E).
Diet A contained the lowest amount of arochlor
1260 (0.0006 mg/kg body weight per day), increasing the
highest amount in diet E (0.23 mg.kg body weight per day).
Females on diet E weighed 20% less than females on diet A at the
end of the study. EROD
activity significantly increased in females on diets D and E.
No histological lesions or significant differences in organ
weights were found in any of the groups.
Mink on diet E tended to have smaller little size, but litter
size at weaning (6 weeks) was not significantly different between
groups. |
50. |
At
Michigan State University Experimental Fur Farm, 19 twelve-week-old male
mink kits were treated with 3.19 mg/kg wet weight Aroclor 1254 in food, and 15 control kits were given food
without detectable levels of PCBs
(Aulerich et al., 2000). Body
mass gain, baculum weight, and baculum length did not differ between
control and treatment groups. |
51. |
Adult
female mink from Michigan State University were fed a diet for 6 months;
2 mink were fed a control diet and 2 were fed the same food with the
addition of 5.0 ppb TCDD
(Render et al., 2000). Maxillae
and mandibles were collected after 6 months.
The treated mink were thin, lethargic and had hair loss compared
to untreated mink. Treated
mink had proliferation of squamous epithelial cells – nests of
squamous epithelium adjacent to teeth, some with cystic centers, which
resulted in loss of alveolar bone. |
52. |
Female
mink were put into groups of twelve and fed diets containing 0.0006,
0.016, 0.053, 0.180, and 1.40 ng/g TCDD
for 131 to 132 days (Hochstein et al., 2001). As the dose increased, the body weight of the mink
decreased and the liver weigh increased.
The mink in the group fed 1.40 ng/g TCDD
had alopecia and thickened, deformed, and elongated toenails
as well as ascites, gastric ulcers, intestinal hemorrhages, decreased
adipose tissue, and mottled and discolored livers, spleens, and kindeys.
Focal lymphocytic meningitis in the region of the olfactory bulb
was found in 42% of the 1.40 ng/g TCDD group.
Two of the mink fed a diet with 1.40 ng/g TCDD died before the end of the study (on day 34 and day 99).
Reproduction was subnormal for all groups. |
II. |
Cholinesterase-Inhibiting Pesticides |
1. |
Mink
were fed methyl parathion
at 0, 30, 48, 78, 125, and 200 ppm in their feed, mixed directly into
diet, or obtained by mixing mink feed with rabbits that were dosed by
gavage with methyl parathion, then sacrificed and combined with mink
feed to get the correct concentration (Aulerich et al., 1987b). The
tests were discontinued after 12 days because mink rejected the dosed
food and were diagnosed as dying of starvation.
Weight change over 12 days in males in the primary exposure test
ranged from –9 to –568 g, and in females it ranged from +32 to
–415 g; total methyl parathion consumption ranged from 0-47.53 mg in males
and 0-50.25 mg in females; mortality for 0, 30, 48, 78, 125, and 200 ppm
groups respectively was 0, 20, 40, 60, 50, and 40%. In the secondary exposure, weight change in males ranged
from +23 to –623 g, and in females it ranged from +16 to -333 g; methyl
parathion consumption ranged from 0-45.65 mg in males and
0-42.14 mg in females; mortality for 0, 30, 48, 78, 125, and 200 ppm
groups respectively was 0, 20, 70, 40, 40, and 50%.
|
III. |
Trace Elements, Metals, and Metalloids |
1. |
Male
and female mink were fed diets containing fish from Lake Michigan and
Lake Erie prior to and throughout breeding (Aulerich et al., 1971). All
females fed Lake Michigan coho salmon experienced complete reproductive
failure and died by the end of the whelping period. Those fed Lake
Michigan bloater chub, Lake Michigan yellow perch, and Lake Erie coho
also exhibited reduced numbers whelping, reduced kit weight, and/or
reduced kit survival. Total Hg
content was measured at 0.30 µg/g for Lake Michigan coho, 0.10 µg/g
for Lake Michigan chub, 0.18 µg/g for lake Michigan perch, and 0.36 µg/g
for Lake Erie coho, though no correlation was found between Hg
concentrations and reproductive decline or mortality. |
2. |
Mink
were fed diets containing either 5 ppm MeHg
or 10 ppm mercuric chloride
through the breeding season (Aulerich et al., 1974). Mink in the MeHg
group began to exhibit signs of Hg
poisoning on the 25th day after treatment and all died
between the 30th and 37th day. The average weight
of this group was significantly less than controls after one month, and
heart and kidney weights were significantly higher. Mink in the mercuric
chloride group showed no signs of Hg
poisoning, weight loss, or reduced whelping. Kit weight was
significantly lower than controls at birth, but normalized by age 4
weeks. Mean Hg tissue
content was significantly higher for the MeHg
group only. |
3. |
Adult
female mink were fed diets consisting of 40% pike homogenate that
contained mean concentrations of 5.7 ppm MeHg
and 5.8 ppm total Hg
for periods of 25, 50, 75, or 100 days (Jernelöv et al., 1976). Total
Hg and MeHg
content increased in liver, spleen, muscle, kidney, and brain tissue
samples and remained the same in fur samples. Concentrations of Se
constant in all tests except kidney and liver, where a increase was
observed. Of the total amount of Hg
found, about 73% was MeHg,
with the liver and kidney containing 46 and 55%, respectively. |
4. |
Adult
and juvenile female mink were fed diets supplemented with 50 and 75%
fish containing 0.44 ppm total Hg
over a 145 day period (Wobeser et al., 1976a). Concentrations of Hg
in the liver and kidney increased more rapidly than those in the brain.
Adult tissue concentrations initially increased more rapidly than
juveniles, but approached adult levels by the end of the study. No
clinical or pathological signs of Hg poisoning were observed. |
5. |
Adult
female mink were fed diets containing 1.1, 1.8, 4.6, 8.3, and 15.0 ppm Hg
as MeHg chloride for 93
days (Wobeser et al, 1976b). Clinical intoxication was observed in mink
in the 1.8 to 15.0 ppm groups, with an onset time that directly related
to Hg dose. Mean
concentrations of Hg in the
tissues of mink that died were 11.9 µg/g brain, 16.0 µg/g muscle, 23.1
µg/g kidney, and 24.3 µg/g liver. Brain lesions and spleen
abnormalities occurred in all treatment groups. Kidney abnormalities
occurred in the 15.0 and 8.3 ppm groups and liver abnormalities were
present in the 15.0, 8.3, 4.6, and 1.8 ppm groups. |
6. |
Mink
fed a diet of 11 ppm PCB
for 66 days were analyzed for Cd
and Hg concentrations
(Olsson et al., 1979). Concentrations of Cd
in treated animals were higher than those in controls. Concentrations of
Hg showed no significant
difference between groups. |
7. |
Eighty-four
ranch-bred mink were separated into four treatment groups and a control
group, and fed commercial mink food supplemented with one of the
following treatments: 1.0 ppm PCB
(Aroclor 1254), 1.0 ppm MeHg,
1.0 ppm PCB plus 1.0 ppm MeHg,
0.5 ppm PCB plus 0.5 ppm MeHg
(½MeHg/PCB group), or no
supplement (Wren et al.,1987a). Mink were fed these diets for
approximately two and a half months, when mink exposed to 1.0 ppm MeHg
either alone or in combination with PCB,
were switched to alternate day feeding as a result of unexpected
mortality of 12 individuals. Mortality tapered off with the revised
feeding schedule. The highest mean liver Hg
levels occurred in the MeHg
group, but had lowered to a similar level as the MeHg/PCB
group by the end of the six-month trial. Both groups maintained higher Hg
concentrations than the ½MeHg/PCB
group. Kits born to MeHg
treated mothers contained greater liver Hg
concentrations than control kits. When tested at 35 days, Hg
levels had lowered, with the ½MeHg/PCB
group maintaining approximately twice the concentration of either of the
two 1.0 µg/g MeHg groups.
No significant differences were found of the test groups in examination
of the thyroid gland, pituitary gland, adrenal gland, or serum T4 or T3
levels. Brain lesions were found in those mink that died of MeHg
poisoning. |
8. |
Mink
were fed 25, 50, or 75% Hg-contaminated
fish collected from the Oak Ridge Reservation (ORR) to study the effects
on metal accumulation and reproduction (Halbrook et al., 1997).
Concentrations of Hg in
tissues of parents and offspring increased with increasing amount of ORR
fish in the diet. Females in the 75% group experienced lower body
weights, reduced litter size, and lower body weights in offspring |
9. |
From
1994-995, farm-raised female mink were fed Hg-contaminated
whitefish and pike from the Bourassa Reservoir, Quebec, at levels to
provide concentrations of 0.1, 0.5, and 1.0 ppm Hg
in the diet (Dansereau et al., 1999). After 60 days, females were mated
with 10-month old males fed a diet containing 0.1 ppm Hg for an equal length of time. Female mink and offspring continued Hg exposure through and beyond the reproductive cycle, and
were again mated to 10-month old males, 10 months after whelping.
Females in the 1.0 ppm group experienced mortality (30/50 of
parents and 6/7 of offspring) after 11 months of exposure.
Length of gestation and number of kits born per female was not
different among dosing groups, though the proportion of females giving
birth was low for all mink except those exposed to 0.1 ppm Hg.
Hepatic concentrations of Hg
for the 0.1, 0.5, and 1.0 ppm groups, respectively, were 28.2, 80.4 and
96.6 µg/g for female parents exposed for 430 days and 15.2, 49.5, and
99.8 µg/g for female offspring exposed for 330 days.
Detection of Hg in
livers of kits that died before solid food was consumed indicated that
exposure occurred in utero
and/or during lactation. |
10. |
Fatty
acid composition was measured in adipose tissue surrounding the lymph
nodes in male and female minks fed control diets of freshwater and
marine fish and similar diets laced with 62 mg Cu/kg
diet (Käkelä and Hyvärinen, 1999).
Two fatty acid components of phospholipids were lower in Cu-treated
groups than in freshwater-diet control groups. |
11. |
Vitamin
levels were measured in liver, adipose tissue, and plasma of male and
female minks fed control diets of freshwater and marine fish and similar
diets laced with 62 mg Cu/kg
diet (Käkelä et al., 1999). Exposure
to Cu had no effect on
hepatic vitamin levels, and caused a decrease in vitamin E levels in
adipose tissue of the freshwater group.
Exposure to Cu
caused a decrease in vitamins A1 and A2 in the
plasma to 50% the control values. Exposure
to Cu caused a significant increase in plasma levels of
thyroxine. |
IV. |
Petroleum |
1. |
Thirty
8-week-old male mink kits were put into 3 groups of 10 and fed diets
containing 0, 100, or 1,000 μg/g weathered Prudhoe Bay crude
oil blended into standard mink feed (Beckett et al., 2002).
Diets were fed to mink during a four-month period (July-November, 2000),
and feed and water were provided ad
libitum. One animal in the 100 μg/g treatment group died
of urolithiasis in the left kidney and urinary bladder prior to the end
of study. Mink (n=29) were anesthetized at the end of trial. A
significant decrease in feed consumption occurred based on mean daily
consumption values; 251.1g (0), 217.88 (100 μg/g), 196.6 (1,000
μg/g). There were no clinical signs of toxicity, and crude
oil consumption did not
affect body weight gain; 1012g (0), 1035g (100 μg/g), 977g (1,000
μg/g). Data suggest exposed mink suffered from anemia, and there
was an upward trend in liver (52.66g 0, 59.78g 100 μg/g, 71.61g
1,000 μg/g) and spleen (3.29g
0, 5.25g 100 μg/g, 5.61 1,000 μg/g) weights with increasing crude
oil concentrations. Examination of tissues and brain sections
indicated no significant alterations. |
V. |
Other |
1. |
In
1974 and 1975, farm mink, ages 10 to 12 weeks were put in groups of 2
males and 8 females. They
were fed 0, 1, 2.5, 6.25, or 15.625 ppm polybrominated
biphenyls (PBBs)
mixed into mink feed, or 1.54 or 11.98 ppm PBB
obtained from mixing PBB
contaminated poultry or beef into mink feed (Aulerich and Ringer 1979).
Percent mortality for the mink in the groups as listed above, was
0, 0, 10, 90, 100, 10, and 100. The
PBB poisoned mink rejected
food, lost weight, had an unthrifty appearance, and had fatty
infiltration of the liver. Female
body weight during the study for the control ranged from 700 g to 950 g,
and for treated females 525 g to 1025 g (estimated from graph).
Brain, heart, liver, lung, spleen, and kidney weights as percent
of body weight for the control group were 1.03, 0.81, 3.70, 1.20, 0.41,
0.67; for the 6.25 ppm 1.53, 0.82, 5.47, 1.44, 0.41, 1.03; for the
15.625 ppm 1.60, 0.80, 5.52, 1.46, 0.39, 0.92; for the 11.98 ppm 1.77,
0.86, 5.58, 1.37, 0.38, 0.92. Average body weight and days on diet for the control, 6.25,
15.625, and 11.98 ppm groups, respectively, were 854.78 g and 313 days,
567.11 g and 210 days, 561.60 g and 74 days, and 519.00 g and 54 days.
Average number of kits whelped per female, percent kit mortality,
average kit birth weight, and kit weight at 4 weeks for controls were
5.6 kits, 23%, 9.1 g, and 128 g; and the range for treated groups 1,
2.5, and 1.54 ppm were 3.5-4.2 kits, 47-60%, 7.5-8.6 g, and 87-132 g.
The 1 ppm and 1.54 ppm groups’ kits weight at birth and 4 weeks
were significantly different from controls.
Mortality (dead/total) for 0, 1, 2.5, 6.25, or 15.625 ppm groups
was 0/10, 0/10, 1/10, 9/10, and 10/10.
No mink in the 6.25 ppm group reproduced, and no mink in the
15.625 ppm group survived to reproduction.
|
2. |
Captive
6-month-old mink at Michigan State University Experimental Fur Farm were
fed dietary concentrations of 0, 0.50, 0.90, 1.62, 2.90, and 5.25 ppm sodium
monofluoroacetate (compound
1080) for 28 days (n = 5 males and 5 females per group,
Hornshaw et al., 1986b). Significant reductions in body weight were observed in
female mink fed 0.90 ppm, and in both sexes fed more than 0.90 ppm.
Change in male body weight (g) for 0, 0.50, 0.90, 1.62, 2.90, and
5.25 ppm groups, respectively, were +283, +354, +36, -204, -614, and
–544, and for females they were +204, +53, -115, -117, -366, and
–445. Cumulative feed
consumption ranged from 1316 to 7217 g, cumulative compound 1080 consumption ranged from 0-7.6 mg.
Ranges of red blood cells/mm3 (x 106),
white blood cells/ mm3 (x 103), hemoglobin (g/dL),
and hematocrit (%) were 9.26-9.89, 6.6-23.3, 21.1-23.2, and 50.5-54.3.
Hemoglobin in the 1.62 and 2.90 ppm treatment groups were
significantly different from the control.
The range of organ weights were (% of brain weight): male/liver
321-839 and female/liver 263-715; male/spleen 15.5-48.0 and
female/spleen 12.5-50.1; male kidney 63.9-104.4, and female/kidney
53.3-86.0; male/lung 84.0-112.4 and female/lung 74.0-96.5; male/heart
59.9-106.7 and female/heart 50.4-74.4; and testes 3.6-9.0. Liver
weights in all treatment groups, spleen weights for males and females
combined in the 1.62, 2.90, and 5,25 ppm treatment groups, kidney weight
for males in the 0.90 ppm treatment and for males and females in all
treatments above 0.90, heart weight in males in the 0.90 treatment and
higher, and heart weight in females in the 5.25 ppm treatment group were
significantly different from controls.
For
mink in a separate reproductive study fed 0, 0.05, 0.20, and 0.80 ppm compound
1080, number of females bred/total females was 12/12, 11/12,
10/12, 2/12; number of females whelped/females bred was 9/12, 9/11,
7/10, and ½; mean number of live kits/female whelped 5.9, 6.0, 4.0, and
5; total number of kits were 6.1, 6.4, 4.0, and 6; percent of kits
surviving after 3 weeks was 94, 85.2, 95.2, and 0; and percent of kits
surviving after 6 weeks was 86.8, 75.6, 85.7, and 0.
Mean kit body weight in the 0.20 treatment group was
significantly different from the control at 3 and 6 weeks, the
difference was due to a decreased litter size in the 0.20 ppm group.
Mean kit body weight at birth ranged from 8.8-9.8 g, at 3 weeks
89.6-108.9, and at 6 weeks 235-292 g.
LC50 values were calculated to be 3.2 ppm.
Concentrations above 0.80 ppm led to decreased weights of liver,
spleen, kidneys, and loss of coordination of hindquarters.
There was a trend towards reduced body weight at lower doses,
however, feed consumption was not reduced.
Compound 1080 was suspected of causing the impaired reproduction
in the mink. |
3. |
Captive
mink were fed warfarin or sodium monofluoroacetate (Aulerich et al.,
1987b). The authors were unable to obtain high enough concentrations of sodium
monofluoroacetate (aconitase inhibitor) in the rabbits to
cause mortality in the mink, so tests for secondary toxicity in mink
were abandoned. In 1984 –
1985, mink were fed warfarin for
4 weeks, mixed into diet directly, or fed to New Zealand white rabbits,
which were sacrificed and mixed with mink feed to obtain correct
concentrations. Mink fed 7
ppm or more warfarin
exhibited anorexia, lethargy, incoordination, and bloody feces.
For mink fed warfarin directly in their food, at 0, 2.2, 3.9, 7.0, 12.5,
22.5 ppm, mortality was 0, 0, 0, 10, 50, and 100%, and mean days to
death were NA, NA, NA, 17, 16.6, and 12.2. Weight change ranged from –138 g to +56 g in males and
–46 to –213 in females, and cumulative feed consumption ranged from
5789 to 8001g for males and 2289 to 4851 for females.
Cumulative warfarin consumption
ranged from 0 to 73.7 mg in males and 0 to 28.7 mg in females.
Feed consumption for males was significantly different from the
controls in the 2.2 ppm group in week 3, the 22.5 ppm group in week 2,
and in females in the 2.2 ppm group in week 3, in the 12.5 ppm group in
acclimation and weeks 3 and 4, and in the 22.5 ppm group in week 2.
In mink fed warfarin
in feed containing rabbit meat from warfarin-contaminated
rabbits, there was no mortality. Weight
change ranged from +18 to +117 g in males and –54 to –127 g in
females, and cumulative feed consumption ranged from 5180 to 7343 g in
males and 3717 to 7203 in females.
Cumulative warfarin
consumption ranged from 0 to 134.1 in males and 0 to 83.7 in females.
Male feed consumption was significantly different from the
control in the 2.2 ppm group in week 2.
|
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