Seasonal variations of phytoplankton diversity in the Coleroon coastal waters, southeast coast of India

• Published in: Acta oceanologica Sinica Vol. 29; no. 5; pp. 97 - 108
• Main Authors: Thillai, Rajasekar K., Rajkumar, M., Sun, Jun, Ashok, Prabu V., Perumal, P.
• Format: Journal Article
• Language: English
• Published: Heidelberg The Chinese Society of Oceanography 01-09-2010; Springer Nature B.V; Centre of Advanced Study in Marine Biology,Annamalai University,Tamil Nadu,India%Centre of Advanced Study in Marine Biology,Annamalai University,Tamil Nadu,India; Department of Biotechnology,Periyar University,Tamil Nadu,India; Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China%Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China%Centre of Advanced Study in Marine Biology,Annamalai University,Tamil Nadu,India
• Subjects: Abundance; Bacillariophyceae; Chemical composition; Chlorophyceae; Chlorophyll; Chlorophyll a; Chrysophyceae; Climatology; Coastal waters; Coasts; Community composition; Community structure; Cyanophyceae; Dinophyceae; Dissolved oxygen; Earth and Environmental Science; Earth Sciences; Ecology; Endangered & extinct species; Engineering Fluid Dynamics; Environmental Chemistry; Environmental factors; Extinction coefficient; Freshwater; Inland water environment; Marine; Marine & Freshwater Sciences; Nutrients; Oceanography; Oxygen content; Parameters; Phosphates; Physicochemical processes; Phytoplankton; Plankton; Quantitative analysis; Salinity; Seasonal distribution; Seasonal variation; Seasonal variations; Seasons; Silicates; Software; Species composition; Species extinction; Summer; Surface temperature; Surface water; Tidal amplitude; Water temperature; Wind; 东南沿海; 季节变化; 晶状体上皮细胞; 植物多样性; 植物群落结构; 沿海水域; 物理化学参数; India; Tamil Nadu India; Bay of Bengal; ISW, India; phytoplankton; diversity; physico-chemical parameters; species composition; Coleroon coastal waters; abundance
• ISSN: 0253-505X; 1869-1099
• DOI: 10.1007/s13131-010-0068-1

The results of an investigation carried out during June 2005 to May 2007 on physico-chemical parameters,species composition and community structure of phytoplankton including Chlorophyll a（Chl-a） at the Coleroon coastal waters（Southeast coast of India） are reported.Air and surface water temperatures（℃） varied from 25.1 to 30.1 and from 24.5 to 28.5 respectively.Salinity values varied from 6 to 28.5 and the pH ranged between 7.0 and 8.3.Variation in dissolved oxygen content was from 3.1 to 7.5 mg/dm^3 while the light extinction coefficient values（LEC） ranged between 3.1 and 10.1 cm.The ranges of inorganic nutrients（μmol/dm^3） viz.,nitrate,nitrite,phosphate and silicate were 10.1-23.4,1.2-8.9,0.2-3.1 and 55-125,respectively.The ranges of Chlorophyll a（μg/dm-3） values was 2.0-7.5.Presently,124 phytoplankton species representing different classes viz：Bacillariophyceae（77）,Dinophyceae（19）,Cyanophyceae（15）,Chlorophyceae（10） and Chrysophyceae（3） were recorded.The phytoplankton cell abundance varied from 0.290 to 111.662 cells/cm-3,with peak diversity（3.38 bits/ind.） during summer season.The maximum abundance was found during summer season coinciding with the stable hydrographical conditions.The seasonal distribution and abundance of phytoplankton are discussed in relation to hydrographical parameters.Canonical Correspondence Analysis（CCA） was applied in this paper for discriminating environmental factors having effect on phytoplankton community at species level.Coleroon coastal water is subjected to long term fluctuations in physico-chemical parameters depending upon the seasonal tidal amplitude and freshwater influx resulting in a continuous exchange of organic,inorganic,plant and animal matters.