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Primary productivity, phytoplankton standing crop and physico-chemical characteristics of the Antarctic and adjacent central Indian Ocean waters

DRS at CSIR-National Institute of Oceanography

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Title Primary productivity, phytoplankton standing crop and physico-chemical characteristics of the Antarctic and adjacent central Indian Ocean waters
 
Creator JiyalalRam, M.
 
Subject phytoplankton
primary production
pigments
biomass
physicochemical properties
 
Description Primary productivity, phytoplankton pigments and physico-chemical properties were studied in Antarctic waters and adjoining Indian Ocean between 11 degrees and 67 degrees E longitudes from polynya region (60 degrees S) to equator during the austral summer season viz. 4th January to 23rd March, 1990. The higher concentration of dissolved oxygen (11.33 mg L sup(-1)) due to photosynthesis was observed. The temperature was low (-2.0 degrees to 2.1 degrees C) in the coastal ice-edge zone. Often, temperature recorded above zero, lowered the salinity from 34.9 to 33.16 x 10 sup(-3). Though there was no direct correlation of nutrients to primary productivity, the constant higher concentration of phosphate (av. 4.12 mu mol dm sup(-3)), nitrate (18.67 mu mol dm sup(-3)) and nitrite (2.74 mu mol dm sup(-3)) in the coastal ice zone than those of Antarctic oceanic region (phosphate 3.03, nitrate 16.17 mu mol dm sup(-3)) and central Indian Ocean (phosphate 2.39, nitrate 15.77 and nitrite 2.47 mu mol dm sup(-3)) indicated regeneration of nutrients in the coastal ice-edge zone which supported fairly high growth of phytoplankton (av. 69.89 x 10 sup(4) cells L sup(-1)). This resulted in markedly high values of chlorophyll and primary productivity (av. Chl a) 2.68 mg m sup(-3), PP 1.68 mg C m sup(-3) h sup(-1)) in the coastal ice-edge zone as compared to those in the Antarctic oceanic region (chl. a) 0.74 mg m sup(-3), PP 0.18 mg C m sup(-3) h sup(-1)) and central Indian Ocean (chl a) 1.86 mg m sup(-3), PP 0.55 mg C m sup(-3) h sup(-1)). Fairly higher values of standing crop and column production in the coastal ice-edge zone (av. 179.39 mg m sup(-3) and 15.8 mg m sup(-2) h sup(-1)) than that of Antarctic oceanic region (49.25 mg m sup(-3) and 1.92 mg C m sup(-2) h sup(-1)) and other oceanic region (124.88 mg m sup(-3) and 6.71 mg C m sup(-2) h sup(-1)) suggested the coastal ice edge zone to be far more productive. Low values (0.003-0.009 mg C [mg chl a)] sup(-1) h sup(-1)) of assimilation number (AN) or photosynthetic rate and high concentration of phaeophytin (av. 12.35-23.50 mg m sup(-3)) recorded in floating ice samples was the indication of unhealthy phytoplankton cells frozen in the ice
 
Date 2009-05-05T04:36:20Z
2009-05-05T04:36:20Z
1994
 
Type Book Chapter
 
Identifier Scientific report of Ninth Indian Expedition to Antarctica, 115-132p.
http://drs.nio.org/drs/handle/2264/2635
 
Language en
 
Relation DOD Tech. Publ.. 6
 
Rights Copyright [1994]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Dept of Ocean Development, New Delhi