CRD 01-17
Session
II: Environmental Studies
|
Polychlorinated
biphenyl fingerprints in young-of-the-year bluefish |
Session
II: Environmental Studies
Abstract No. II-1
ORAL PRESENTATION |
Ashok
D. Deshpande
NOAA/NMFS/NEFSC,
74 Magruder Rd., Highlands, NJ 07732
Estuaries provide important
summer nurseries for the young-of-the-year bluefish where they may
also be exposed to the varying levels of endocrine disrupting chemicals
such as the polychlorinated biphenyls.� Bluefish from a relatively
pristine estuary will be conceivably subjected to a lesser polychlorinated
biphenyl body burden than bluefish from a relatively contaminated estuary.� Navesink
River, Little Egg Harbor, Great South Bay, Newark Bay, and Hudson River
are the five representative estuaries within the New York Bight ecosystem
with varying degrees of habitat degradation in relation to the polychlorinated
biphenyls.� Preliminary data collected thus far suggests estuary specific
polychlorinated biphenyl fingerprint differences between young-of-the-year
bluefish from the Newark Bay and those from the Great South Bay.
|
Patterns
in biochemical condition of some
young-of-the-year demersal fishes: the price of seasonal migration |
Session
II: Environmental Studies
Abstract No. II-2
ORAL PRESENTATION |
Presentation
Vincent
G. Guida
NOAA/NMFS/NEFSC,
74 Magruder Rd., Highlands, NJ 07732
The accumulation of storage
lipids, especially triacylglycerides (TAG), plays a vital role in the
ability of YOY fishes to survive seasonal migrations and/or overwintering.
In order to better understand the importance of habitat and timing
in preparation for migration, I investigated the time-course and spatial
distribution of storage lipids in YOY scup (Stenotomus chrysops)
and black sea bass (Centropristis striata) at stations representing
differing habitats within the Inner New York Bight and Lower New York
Bay.� Freeze drying and dry grinding of fish allowed analysis of whole
fish over a large size range, analysis of the same subsamples for both
lipids and protein and expression of results on a dry weight basis.� Use
of thin layer chromatography with flame ionization detection for lipid
class analysis allowed me to distinguish small differences in TAG content
within a larger background of structural lipids. Similar temporal patterns
were observed in both species: little TAG accumulation (<0.5% of
dry mass) was evident in fish during August, with significantly greater,
though variable TAG levels (maximum 3% of dry mass) in fish during
October.� Water content in both species showed the inverse pattern:
greater during August, less during October.� Clear size thresholds
for the initiation of TAG accumulation were apparent in both species:
50 mm standard length for S. chrysops and 40 mm standard length
for C. striata.�� Results are discussed with respect to similar
lipid deposition patterns for other migratory demersal fish and the
trade-off between fat deposition and growth for YOY migrants.
Keywords:
black sea bass, scup, lipids, ontogeny
|
Benthic
invertebrate assemblages at�Spartina alterniflora marshes
reestablished after an oil spill in the Arthur Kill (NY/NJ) |
Session
II: Environmental Studies
Abstract No. II-3
ORAL PRESENTATION |
Presentation
Joseph J. Vitaliano, Robert
N. Reid, and David B. Packer
NOAA/NMFS/NEFSC,
74 Magruder Rd., Highlands, NJ 07732
In January 1990, an oil spill
damaged salt marshes along the banks of the Arthur Kill (New
York and New Jersey). In the years following the spill, Spartina
alterniflora seedlings were planted at many of the
damaged sites and successfully reestablished at these sites.� In 1996,
the Coastal Ecology Branch began a study to compare the benthic invertebrate
assemblages at the reestablished S. alterniflora marshes to
those at nearby existing marshes in the Arthur Kill.� Oligochaetes,
nematodes, and the small tube-building polychaete, Manayunkia aestuarina were
the dominant taxa in the study.� Significant differences were found
in the abundances of all invertebrate individuals, oligochaetes, and
nematodes between the September and May sampling times but not between
reestablished and existing marshes.� Benthic invertebrate community
structural was similar at reestablished and existing marshes.� Recovery
time for these benthic invertebrate measures is estimated at three
to four years following planting of the Spartina seedlings.
|
Habitat
and species associations of fish, megafauna,
and benthic infauna in the New York Bight Apex |
Session
II: Environmental Studies
Abstract No. II-4
ORAL PRESENTATION |
Sukwoo Chang, Joseph J.
Vitaliano, and Frank W. Steimle
NOAA/NMFS/NEFSC,
74 Magruder Rd., Highlands, NJ 07732
In
the study, multivariate statistical procedures were used to investigate
distribution abundance associations among fish species collected during
the 12 mile dump sites monitoring in the New York Bight apex, and to
further examine habitat associations between individual fish species
and benthos, and between fish species and environmental habitat variables
from a synoptic data base of three domains (fish, benthos and habitat).
The analysis of integration and synthesis of using these synoptic data
sets is a unique case, even though the scope of the data base is limited
in time and space.� Disturbance and alteration of fish habitat in the
New York Bight apex with fluctuation of characteristics of surrounding
waters in time and space are explored.�� The approach of using habitat
and species associations can be better understood the essential fish
habitat relationships of fish resource in the New York Bight apex,
and can be extended to be a part of total fisheries management that
includes biotic and abiotic effects among fish and megainvertebrate
communities and their ecosystems.
|
The
role of local wintertime atmospheric heat flux in determining
springtime temperature variability in the northern Mid-Atlantic
Bight during 1965-1973 |
Session
II: Environmental Studies
Abstract No. II-5
ORAL
PRESENTATION |
Maureen H. Taylor and
David G. Mountain
NOAA/NMFS/NEFSC,
166 Water St., Woods Hole, MA 02543-1026
This project examines the
role of local atmospheric forcing in the transition from relatively
cold to warmer springtime temperatures in the northern Middle Atlantic
Bight region during 1965 -1973.� A one-dimensional water column model
is run for eight consecutive winter seasons with the local surface
heat flux used as the only external forcing.� Historical data from
the Nantucket Light Ship along with modeled radiation estimates for
New York and Boston are used in the heat flux calculations.� Two model
simulations were made for each winter season and the results allow
for both a qualitative and quantitative comparison of the modeled output
with the observed regional temperature variability and with the observed
temperature changes measured at Nantucket Light Ship.� Variability
in the local atmospheric heat flux during the wintertime was shown
to be a dominant factor in determining springtime temperature conditions
during the study period.� Regression residuals indicate that advective
processes may have contributed to the observed temperature variability,
although it is believed that the advective influence is secondary to
the local surface heat flux in the northern Middle Atlantic Bight.
