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1 2025

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Elucidating the variation of phytoplankton pigments in estuarine ecosystem

Ramakrishnan Reshmitha, Singh Keisham Sarjit, Imchen Temjensangba

Oceanologia

2025

No. 67 (1)

Art. no. 67110

Phytoplankton pigments were used to study the community structure and phytoplankton size class in Goa’s estuaries. The study revealed that fucoxanthin and chlorophyll a were the most dominant pigments. The correlation of diagnostic pigments (DP) and chl a correlated positively in both estuaries (Mandovi: R2 = 0.703, P < 0.01; Zuari: R2 = 0.892, P < 0.01), suggesting that DP can serve as a proxy to measure phytoplankton biomass. Results showed that with DP and biomass proportion, phytoplankton size class (picoplankton, nanoplankton and microplankton) can be derived. Picoplankton biomass was highest during pre-monsoon season, while microplankton biomass was high during monsoon season. The high abundance of microplankton may support planktivorous fishery productivity.