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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.

Dinoflagellate Bloom Produced by Protoperidinium divergens Response to Ecological Parameters and Anthropogenic Influences in the Junglighat Bay of South Andaman Islands