Spatio-temporal variation of microphytoplankton in the upwelling system of the south-eastern Arabian Sea during the summer monsoon of 2009

• Autorzy: Thomas L. C. , Padmakumar K. B. , Smitha B. R. , Asha Devi C. R. , Bijoy Nandan S. , Sanjeevan V. N.
• Języki publikacji: EN

Abstrakty

EN

The phytoplankton standing crop was assessed in detail along the South Eastern Arabian Sea (SEAS) during the different phases of coastal upwelling in 2009. During phase 1 intense upwelling was observed along the southern transects (8°N and 8.5°N). The maximum chlorophyll a concentration (22.7 mg m-3) was observed in the coastal waters off Thiruvananthapuram (8.5°N). Further north there was no signature of upwelling, with extensive Trichodesmium erythraeum blooms. Diatoms dominated in these upwelling regions with the centric diatom Chaetoceros curvisetus being the dominant species along the 8°N transect. Along the 8.5°N transect pennate diatoms like Nitzschia seriata and Pseudo-nitzschia sp. dominated. During phase 2, upwelling of varying intensity was observed throughout the study area with maximum chlorophyll a concentrations along the 9°N transect (25 mg m-3) with Chaetoceros curvisetus as the dominant phytoplankton. Along the 8.5°N transect pennate diatoms during phase 1 were replaced by centric diatoms like Chaetoceros sp. The presence of solitary pennate diatoms Amphora sp. and Navicula sp. were significant in the waters off Kochi. Upwelling was waning during phase 3 and was confined to the coastal waters of the southern transects with the highest chlorophyll a concentration of 11.2 mg m-3. Along with diatoms, dinoflagellate cell densities increased in phases 2 and 3. In the northern transects (9°N and 10°N) the proportion of dinoflagellates was comparatively higher and was represented mainly by Protoperidinium spp., Ceratium spp. and Dinophysis spp.

Słowa kluczowe

EN

South Eastern Arabian Sea; upwelling; coastal waters; phytoplankton; chlorophyll a; diatoms

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2013
• Tom: No. 55 (1)
• Strony: 185--204
• Opis fizyczny: Bibliogr. 51 poz., tab., wykr.

Twórcy

autor

Thomas L. C.

autor

Padmakumar K. B.

autor

Smitha B. R.

autor

Asha Devi C. R.

autor

Bijoy Nandan S.

autor

Sanjeevan V. N.

• Centre for Marine Living Resources and Ecology, Ministry of Earth Sciences, Kochi-37, Kerala, India,

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