Applied Environmental Research

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The bloom-forming dinoflagellate, Protoperidinium divergenshas been linked with coastaleutrophication in tropical and subtropical regions. Moderate to intense harmful algal bloom of dinoflagellates Protoperidinium divergens (33,500 cells. mL-1) was observed during June 2012in Junglighat Bay of Port Blair in South Andaman. Bloom of Protoperidinium divergenswas observed for four days and declined afterwards due to heavy rainfall with low seawater temperature of 24 to 26°C. A total of 63 species and 33 genera were identified. In the present investigation, the following species of phytoplankton and zooplankton were found to be common; phytoplanktonsuch as Amphorasp., Bacteriastrumsp., Chaetocerossp., Coscinodiscussp., Rhizosoleniasp., Gonyaulaxsp., Protoperidinium sp., Pyrophacussp.and zooplankton such as Paracalanussp.,Euterpina sp., fish eggs, Copepod nauplii, Codonella sp. and Tintinnopsis sp. Hydrobiologicalparameters analyzed during and post-bloom showed dissolved oxygen in the range of 2.23 - 4.46mg.L-1. Nutrients such as nitrate varied from 0.37-1.118µmol.L-1,nitritefrom 0.37-1.118 µmol.L-1, phosphate (0.10-0.289 µmol.L-1) and silicate (6.22-9.333 µmol.L-1). Anthropogenic activities increased eutrophication in JunglighatBay and led to nutrient enrichment in the watercolumn, although precipitation could also have favoured the outbreak of these dinoflagellates.

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