Bloom of Hemidiscus hardmannianus (Bacillariophyceae) and Its Impact on Water Quality and Plankton Community Structure in a Mangrove Wetland

An intense monospecies bloom of the centric diatom Hemidiscus hardmannianus (Greville) Mann. (Bacillariophyceae) occurred in the coastal waters of Sundarban mangrove wetland, India on 22 July, 2010. The species was abruptly flourished (mean density 8.86 × 106 cells/L) resulting intense green colorat...

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Bibliographic Details
Published in:Clean : soil, air, water air, water, 2013-04, Vol.41 (4), p.333-339
Main Authors: Naha Biswas, Sejuti, Godhantaraman, Nallamuthu, Sarangi, Ranjit K., Bhattacharya, Bhaskar D., Sarkar, Santosh K., Satpathy, Kamala K.
Format: Article
Language:English
Subjects:
Alga
Bacillariophyceae
Hemidiscus
Hilsa ilisha
Mesozooplankton
Nutrient
Sundarban wetland
Tintinnida
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Summary:An intense monospecies bloom of the centric diatom Hemidiscus hardmannianus (Greville) Mann. (Bacillariophyceae) occurred in the coastal waters of Sundarban mangrove wetland, India on 22 July, 2010. The species was abruptly flourished (mean density 8.86 × 106 cells/L) resulting intense green coloration of water. The greatest impoverishment of diversity and density of phytoplankton, micro‐ and mesozooplankton community was observed during the bloom. The phytoplankton community showed an extreme reduction in diversity (12 species to one) and sharp decrease in standing stock (12.84 × 103 to 8.86 × 106 cells/L) during this period. The late bloom condition coincided with sudden and huge arrival of a clupoid fish Hilsa ilisha which forms the most potential fisheries in Sundarban deltaic region. An attempt has been made to correlate the satellite remote sensing‐derived information to the bloom conditions. The MODIS‐Aqua derived chlorophyll and TMI satellite derived sea surface temperature and wind speed maps have been interpreted. The results indicated that the bloom of Hemidiscus hardmannianus occurred at higher temperature and moderate wind speed conditions. The occurrence of the bloom‐forming species with its tremendous impact on plankton community structure necessitates adaptive management strategies. This would help to substantially reduce the occurrence and impact of algal blooms and also to overcome the effects of climate change on algal blooms.
ISSN:1863-0650
1863-0669
DOI:10.1002/clen.201200012