Provided by the NOAA Arctic
Research Office
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RUSCALA
Productivity,
Chlorophyll and Phytoplankton in Bering Strait and Chukchi Sea
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Sang Lee, Nutrient Lab Photo, B. Bluhm |
To estimate carbon and nitrogen uptake of phyplankton
at different locations, productivity experiments were executed by incubating
phytoplankton in the swimming pools
Along
with the small productivity bottle experiments, five large volume productivity
experiments were executed to look at the physiology status of phytoplankton
at the small productivity stations. These filtered (GF/F, ø = 47 m) samples
will be chemically analyzed for the photosynthetic end products of phytoplankton
such as lipid, protein, polycarbonate and LMWM.
Since the photosynthetic end products are affected by species
composition of phytoplankton, phytoplankton samples were taken from the CTD
casts at every productivity station for species identification. The total
87 phytoplankton samples stored in
The
Chlorophyll a concentrations will
also be used to calibrate the in vivo
fluorescence profiles. The samples were collected with the rosette on upcasts
and extracted chlorophyll a
concentrations were be determined
fluorometrically (Parsons et al., 1984).
Concurrent
bioassays of phytoplankton nutrient utilization were performed using single
and multiple nutrient (nitrogen, phosphorus and silicate) additions and trace
metals. Emphasis will be on iron enrichments to assess potential effects on
productivity rates. Phytoplankton taxa will be determined at one or two depths
on each productivity station and particulate carbon/nitrogen samples will
be obtained for each productivity sample.