Show simple item record

dc.contributor.authorJiyalalRam, M.J.
dc.date.accessioned2009-05-05T04:36:20Z
dc.date.available2009-05-05T04:36:20Z
dc.date.issued1994
dc.identifier.citationScientific report of Ninth Indian Expedition to Antarctica, 115-132p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/2635
dc.description.abstractPrimary 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
dc.language.isoen
dc.publisherDept of Ocean Development, New Delhi
dc.relation.ispartofseriesDOD Tech. Publ.. 6
dc.rightsCopyright [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.
dc.subjectphytoplankton
dc.subjectprimary production
dc.subjectpigments
dc.subjectbiomass
dc.subjectphysicochemical properties
dc.titlePrimary productivity, phytoplankton standing crop and physico-chemical characteristics of the Antarctic and adjacent central Indian Ocean waters
dc.typeBook Chapter


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record