Diatoms from surface sediments of Enderby Basin of Indian Sector of Southern Ocean |
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Authors: | Rahul Mohan Sunil Kumar Shukla Shramik M Patil Suhas S Shetye Karima K Kerkar |
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Institution: | 1.National Centre for Antarctic and Ocean Research,Headland Sada,Vasco-da-Gama, Goa,India |
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Abstract: | Diatoms from surface sediment samples collected from Enderby Basin of Indian Sector of Southern Ocean were analyzed to determine
the relative abundance and distribution of seven key indicator diatom species viz. Sea ice related species Fragilariopsis rhombica, F. separanda, F. curta, F. ritscheri, Thalassiosira tumida and Actinocyclus actinochilus and Open Ocean species F. kerguelensis on the basis of modern physico-chemical parameters. The relative abundances of different species observed viz. F. rhombica — 6.25%; F. separanda — 12.5%; F. curta — 10.53–13.33%; F. ritscheri — 4.55–12.5%; F. kerguelensis — 6.25–63.64%; T. tumida — 3.13% and A. actinochilus — 9.38–13.33%. The increasing abundance of F. kerguelensis consecutively suggests the effect of Antarctic bottom water in the study area which is further substantiated by the presence
and increasing abundance of F. ritscheri. The gradual decrease in abundance or absence of sea ice related species from the sampled stations indicates the summer and
winter sea ice extent concentration in the study area. The nutrient concentration correlates with the distribution and abundances
of diatom species. |
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