Seasonal variations in carbon budget in water column off Princess Astrid coast, Antarctica
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Date
1996Author
Dhargalkar, V.K.
Matondkar, S.G.P.
Verlecar, X.N.
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Phytoplankton, zooplankton and particulate matter were studied round the year at a fixed station off Lazarev, Princess Astrid Coast, Antarctica, to assess the impact of prolonged winter on carbon flux. Summer-Winter phytoplankton total counts did not vary much and ranged from 2.8 to 22.8 no. x 10 sup(-4) l sup(-1) . Chlorophyll a showed considerable decrease in winter and varied from 0.035 to 0.073 mg m sup(-3) and in summer from 0.09 to 3.68 mg m sup(-3) . Zooplankton population was high during summer (600 to 2255 no. 100 m sup(-3)) and low in winter (437 to 1184 no. 100 m sup(-3)). Particulate carbon values ranged from 46 to 83 mu g l sup(-1) during summer and from 22.2 to 63.8 mu g l sup(-1) in winter. Particulate nitrogen showed little variation during summer and winter (5-10.15 mu g l sup(-1)). Winter effect was particularly seen on the biochemical composition of particulate material when P-CHO and particulate lipid were high during winter and low in summer. An attempt has been made to evaluate the role of dominant species of phytoplankton and zooplankton in overall composition in POC/PON and C:N of particulate matter round the year in surface and water column upto 100 m water depth
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