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

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

Content Provider	CUSAT-Thesis
Author	Bijoy, Nandan S. Lathika, Cicily Thomas Padmakumar, K. B. Smitha, B. R. Asha Devi, C. R. Sanjeevan, V. N.
Abstract	The phytoplankton standing crop was assessed in detail along the South EasternArabian 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) wasobserved in the coastal waters off Thiruvananthapuram (8.5◦N). Further norththere was no signature of upwelling, with extensive Trichodesmium erythraeumblooms. Diatoms dominated in these upwelling regions with the centric diatomChaetoceros curvisetus being the dominant species along the 8◦N transect. Alongthe 8.5◦N transect pennate diatoms like Nitzschia seriata and Pseudo-nitzschia sp.dominated. During phase 2, upwelling of varying intensity was observed throughoutthe study area with maximum chlorophyll a concentrations along the 9◦N transect(25 mg m−3) with Chaetoceros curvisetus as the dominant phytoplankton. Alongthe 8.5◦N transect pennate diatoms during phase 1 were replaced by centric diatomslike Chaetoceros sp. The presence of solitary pennate diatoms Amphora sp. andNavicula sp. were significant in the waters off Kochi. Upwelling was waning duringphase 3 and was confined to the coastal waters of the southern transects withthe 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 wasrepresented mainly by Protoperidinium spp., Ceratium spp. and Dinophysis spp.
File Format	PDF
Language	English
Publisher	Polish Academy of Sciences, Institute of Oceanology
Access Restriction	Open
Subject Keyword	South Eastern Arabian Sea Upwelling Coastal waters Phytoplankton Chlorophyll a Diatoms
Content Type	Text
Resource Type	Article

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