- Dona Paula, Goa, India.
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| Abstract Submission No. | ABS-2022-05-0079 |
| Title of Abstract | Micro-phytoplankton communities from contrasting oceanographic conditions in the eastern Arabian Sea during the winter monsoon |
| Authors | Pranoy Paul*, Jagadish S Patil, A C Anil |
| Organisation | CSIR-National Institute of Oceanography, Goa |
| Address | Room no. SAB-10, NIO Colony, Dona Paula, Panjim, Goa Panjim, Goa, India Pincode: 403004 Mobile: 8017233597 E-mail: ppaul@nio.org |
| Country | India |
| Presentation | Poster |
| Abstract | Micro-phytoplankton communities and the hydrographic conditions that control them are described from north and south of the eastern Arabian Sea during winter monsoon (November to February). Convective mixing and geostrophic currents associated with the Rossby wave propagation are considered to be the prominent oceanographic process that influences phytoplankton composition and biomass during the sampling season in the northeastern (NEAS) and southeastern (SEAS) Arabian Sea respectively. The surface water collected for micro-phytoplankton samples during two and one cruises in the north (February 2015 and November 2016) and south (November 2016), respectively, were used to decipher the differences. Here the morphotypes and taxa are used as traits to understand micro-phytoplankton distribution. The results revealed that the phytoplankton biomass, abundance, number of species and composition (both morphotypes and taxa) were higher in NEAS than SEAS. Overall, diatoms dominated the micro-phytoplankton community and the contribution was highest in NEAS (86-98%) compared to SEAS (68%). A total of 66 (37 diatoms and 29 dinoflagellates) and 39 (19 diatoms and 20 dinoflagellates) micro-phytoplankton species corresponding to sixteen and ten morphotypes were recorded in NEAS and SEAS, respectively. Among them, the highest number of species corresponded to cylindrical followed by an ellipsoid, ellipsoid+2 cone+cylinder and elliptic prism morphotypes. In terms of abundance, contribution of cylindrical and prism on parallelogram morphotypes were highest (65%) in NEAS whereas in SEAS, cylindrical, ellipsoid, and prism on parallelogram morphotypes contributed equally (~20% each) suggesting that the micro-phytoplankton with these morphotypes have some selective advantages over others for dominance in NEAS and SEAS. |