Fine-scale responses of phytoplankton to freshwater influx in a tropical monsoonal estuary following the onset of southwest monsoon |
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| Authors: | SURAKSHA M PEDNEKAR S G PRABHU MATONDKAR HELGA DO R GOMES JOAQUIM I GOES SUSHMA PARAB VIJAYA KERKAR |
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| Institution: | (1) Centre for Ecological Research, Kyoto University, 2-509-3 Hirano, Otsu Shiga, 520-2113, Japan;(2) Biological Oceanography Division, National Institute of Oceanography, Dona Paula, Goa, 403 004, India; |
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| Abstract: | In May of 2007, a study was initiated by the National Institute of Oceanography (NIO), Goa, India, to investigate the influence
of monsoonal rainfall on hydrographic conditions in the Mandovi River of India. The study was undertaken at a location ∼2 km
upstream of the mouth of this estuary. During the premonsoon (PreM) in May, when circulation in the estuary was dominated
by tidal activity, phytoplankton communities in the high saline (35–37 psu) waters at the study site were largely made up
of the coastal neritic species Fragilaria oceanica, Ditylum brightwellii and Trichodesmium erythraeum. During the later part of the intermonsoon (InterM) phase, an abrupt decline in salinity led to a surge in phytoplankton
biomass (Chlorophyll a ∼14 mg m − 3), of a population that was dominated by Thalassiosira eccentricus. As the southwest monsoon (SWM) progressed and the estuary freshened salinity and Chlorophyll a (Chl a) concentrations decreased during the MoN, Skeletonema costatum established itself as the dominant form. Despite the low biomass (Chl a <2 mg m − 3), the phytoplankton community of the MoN was the most diverse of the entire study. During the postmonsoon (PostM), the increase
in salinity was marked by a surge in dinoflagellate populations comprising of Ceratium furca, Akashiwo sanguinea, and Pyrophacus horologium. |
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