Variation of phytoplankton biomass, diversity and assemblage in a typical bivalve farming sites in Ashtamudi estuary, south west coast of India

by GIREESH
(INDIA)

Original Text: Variation of phytoplankton biomass, diversity and assemblage in a typical bivalve farming sites in Ashtamudi estuary, south west coast of India.


Phytoplankton biomass, diversity and community structure in relation to environmental variables were investigated at two sites of Ashtamudi estuary, south west coast of India during one year period. The investigation was performed monthly at a station inside estuary, where have active mussel farming and another station at near bar mouth. The result showed that change in physico-chemical variables was responsible for variation in phytoplankton composition and diversity in respective areas even though those differences were not statistically different. Considerable deviation among different phytoplankton groups and diversity were recorded in farm area during monsoon season. The community structure analysis showed that the species composition at two sites was mostly determined by seasonal variations and not by mussel farming. No toxic algal bloom was observed in this area.

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Revised Text:


Phytoplankton biomass, diversity, and community structure in relation to environmental variables, was investigated at two sites on the Ashtamudi estuary, on the south west coast of India, during a one year period. The investigation was performed monthly at a station inside the estuary which has active mussel farming, and at another station near the bar mouth.

Results showed that changes in physico-chemical variables were responsible for variations in phytoplankton composition and diversity in the respective areas, even though those differences were not statistically different.

Considerable deviation among different phytoplankton groups and diversity was recorded in farm areas during the monsoon season. The community structure analysis showed that the species composition at two sites was mostly determined by seasonal variations and not by mussel farming. No toxic algal bloom was observed in this area.

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