Summary of Abstract Submission

Abstract Submission No. IO50-09-0070PresentationPoster

SPATIAL DISTRIBUTION OF PHYTOPLANKTON AND ZOOPLANKTON IN COASTAL WATERS OF BAY OF BENGAL

K. C. Sahu *1, S.K. Baliarsingh2, Aneesh A. Lotliker2, T. Srinivasa Kumar2

1 Dept. of Marine Sciences, Berhampur University, India
2 Indian National Centre for Ocean Information Services, India

ABSTRACT :

Phytoplankton and zooplankton community structure was studied during a summer cruise in coastal waters of Bay of Bengal. Species composition, abundance and distribution of phytoplankton and zooplankton along with water quality parameters (transparency, water temperature, salinity, pH, dissolved oxygen, nutrients viz. nitrite, phosphate and chlorophyll-a) were examined. During the study period, sea surface temperature (SST) varied from 27.9C to 28.3C with an average of 28.1C. Salinity varied from 33.0 to 35.0 psu with an average of 34.5 psu. A total of 123 phytoplankton species and zooplankton groups belonging to 13 phyla were recorded from seven transects. Phytoplankton floral spectrum was represented by 86 species of diatoms from 44 genera, 22 species of dinoflagellates from 10 genera, 5 species of green algae from 5 genera, 4 species of cyanobacteria from 4 genera, 2 species of cocolithophores from 2 genera and 1 species of silicoflagellate. Diatoms and copepods dominated the phytoplankton and zooplankton community respectively. Thalassiothrix longissima was quantified as the dominant species among diatoms whereas calanoid copepods, namely Paracalanus parvus, P. aculeatus, Temora turbinata were common in all the transects. Abundance of bloom forming phytoplankton species Asterionellopsis glacialis was observed at transects off Godavari & off Mahanadi. Diversity and evenness indices of phytoplankton were found highest at Godavari transect. Whereas, highest diversity index observed ff Pennar for zooplankton. No large scale spatial variation of species composition was observed.