Spatial variability in phytoplankton community structure along the eastern Arabian Sea during the onset of south-west monsoon

Show simple item record Ahmed, A. Kurian, S. Gauns, M. ChndrasekharaRao, A.V. Mulla, A. Naik, B. Naik, H. Naqvi, S.W.A. 2016-04-11T07:01:33Z 2016-04-11T07:01:33Z 2016
dc.identifier.citation Continental Shelf Research, vol.119; 2016; 30-39
dc.identifier.other no
dc.description.abstract The Arabian Sea experiences moderate to weak upwelling along the south-west coast of India, which subsequently propagates towards the north. This causes variation in plankton community composition, which is addressed in the present study. Here we report the spatial variations in distribution of phytoplankton groups along the north-south transect in the eastern Arabian Sea based on marker pigments supported with flow-cytometric and microscopic analyses. 15 phytoplankton pigments were identified using High-performance liquid chromatography (HPLC) and the chemotaxonomic software (CHEMTAX) analysis associated these to seven major group of phytoplankton. The phytoplankton biomass, chlorophyll a (Chl a) was higher in southern stations with dominance of fucoxanthin whereas, divinyl chlorophyll a (divinyl Chl a), marker pigment of Prochlorococcus was present only in the northern region. Microscopic observation revealed the dominance of larger forms; diatoms (Chaetoceros coarctatum and Nitzschia sp.) and dinoflagellates (Scrippsiella sp., Oxytoxum nanum and Oxytoxum sp.) in the southern region. Furthermore, a study of plankton size distribution showed dominance of picoplankton (f<sub>pico</sub>) followed by nanoplankton (f<sub>nano</sub>) along the northern stations with comparatively higher microplankton (f<sub>micro</sub>) in the south. This study clearly showed the influence of different environmental conditions on the phytoplankton community as reflected in dominance of diatoms in the southern (south of 12 °N) and that of picoplankton in the northern (north of 12 °N) region
dc.language.iso en
dc.publisher Elsevier
dc.relation.requires Cont_Shelf_Res_119_30.jpg
dc.rights An edited version of this paper was published by Elsevier. Copyright [2016] Elsevier
dc.subject AQUATIC COMMUNITIES::Phytoplankton
dc.subject AQUATIC COMMUNITIES::Habitat community studies
dc.subject CHEMISTRY AND BIOGEOCHEMISTRY::Organic compounds
dc.subject POPULATION STUDIES::Population structure
dc.title Spatial variability in phytoplankton community structure along the eastern Arabian Sea during the onset of south-west monsoon
dc.type Journal Article

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