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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.40 [2011] >
IJMS Vol.40(5) [October 2011] >
| Title: | Phytoplankton species composition, abundance and distribution in Fishing area 58 of Indian Ocean sector of Southern Ocean |
| Authors: | Rathod, Vijayakumar |
| Keywords: | Phytoplankton
Southern Ocean
Polar Front
Sub Antarctic |
| Issue Date: | Oct-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Phytoplankton species composition,
abundance and standing stocks investigations
were carried out during the First Indian Antarctic Krill Expedition (FIKEX).
Nitrate, phosphate and silicate were available in sufficiently higher
concentrations at Polar Front zone. Nitrate and silicate, exhibited a marked
boundaries between high values in the Sub Antarctic region. Diatom dominated
the phytoplankton in the study region and their numbers generally increases
southward with peaks of abundance in Sub Antarctic waters. Dinoflagellates,
flagellates and “monads” occur in highest concentration north of the Polar
Front zone. Various diatom assemblages are characteristics of different
latitudinal zones. Vicinity of the Polar Front was found to be rich in Nitzschia, Pseudonitzschia group of
species. South of Polar Front Nitzschia “nana” (Cells of both N. cylindrus and N. pseudonana)
and Dactyliosolen tenuijunctus dominate. Diatoms viz. Fragilariopsis
kerguelensis and Thalassionema nitzschioides ; were reported earlier and present studies. Present study laso
reveals that the diatom Pseudonitzschia
spp. were numerous in numbers. |
| Page(s): | 671-679 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.40(5) [October 2011]
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