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Bloom Forming Species of Phytoplank.on in Two Coastal Waters in the Southeast Coast of India

Journal of Ocean University of China 2010年第3期9卷 265-272页

作者： k. thillai rajasekar M. Rajk.mar SUN Jun V. Ashok.Prabu E Perumal Centre of Advanced Study in Marine Biology Annamalai University Parangipettai - 608502 Tamil Nadu India Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 P. R. China Department of Biotechnology Periyar University Salem - 636011 Tamil Nadu India

The results of an investigation carried out during June 2005 to May 2007 on bloom-forming phytoplank.on species composition and abundance in the Parangipettai and Coleroon coastal waters （Southeast coast of India） are reported. Air and surface water temperatures （℃） varied from 25.1 to 30.1 and 24.5 to 28.5, respectively, in the former waters and from 25.5 to 31.2 and 25.0 to 29.3 in the latter waters. The respective salinities varied from 6.0 to 28.5 and 5.0 to 33.1 and the respective pH ranged between 7.0 and 8.3 and 7.2 and 8.3. Correspondingly, the dissolved oxygen content varied from 3.1 to 7.5 and 3.1 to 7.9 mgL1 while the light extinction coefficient （LEC） values ranged between 3.1 and 10.1 and 1.8 and 11.0. The content ranges of inorganic nutrients, i.e., nitrate, nitrite, phosphate and silicate （μmolL^-1）, in the Parangipettai and Coleroon coastal waters were： 6.5- 27.0; 1.0- 8.9; 0.1-3.0 and 15.0 -140 and 10.1-23.4; 1.2-8.9; 0.2-3.1 and 55-125 respectively. The chlorophyll α contents in both waters ranged from 2.0-7.5 μgL^-1. Presently, 124 phytoplank.on species representing different classes were recorded in the Coleroon coast, viz, Bacillariophyceae （77）; Dinophyceae （19）; Cyanophyceae （15）; Chlorophyceae （10） and Chrysophyceae （3）, whereas 117 phytoplank.on species were recorded in the Parangipettai coast, viz, Bacillariophyceae （66）; Dinophyceae （22）; Cyanophyceae （19）; Chlorophyceae （7） and Chrysophyceae （3）. The phytoplank.on cell abundance in the Parangipettai and Coleroon coastal waters varied from 290 to 111662 and 140 to 132 757 cells L^-1, respectively, with peak.diversity （3.38 and 3.52 bits indl.） recorded in summer. The maximum abundance occurred in summer coinciding with the stable hydrographical conditions. The seasonal distribution and abundance of phytoplank.on are discussed in relation to hydrographical parameters. Totally 31 and 24 species of phytoplank.on were found to be bloom-forming in the Parangipettai and Coleroon coastal waters,

关键词： Bloom-forming phytoplank.on species abundance Parangipettai and Coleroon coastal waters

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Seasonal variations of phytoplank.on diversity in the Coleroon coastal waters,southeast coast of India

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Acta Oceanologica Sinica 2010年第5期29卷 97-108页

作者： thillai rajasekar k.Rajk.mar M SUN Jun Ashok.Prabu V Perumal P Centre of Advanced Study in Marine Biology Annamalai University Tamil Nadu India Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Department of Biotechnology Periyar University Tamil Nadu India

The results of an investigation carried out during June 2005 to May 2007 on physico-chemical parameters,species composition and community structure of phytoplank.on including Chlorophyll a（Chl-a） at the Coleroon coastal waters（Southeast coast of India） are *** and surface water temperatures（℃） varied from 25.1 to 30.1 and from 24.5 to 28.5 *** values varied from 6 to 28.5 and the pH ranged between 7.0 and *** 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 *** 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,*** ranges of Chlorophyll a（μg/dm-3） values was ***,124 phytoplank.on species representing different classes viz：Bacillariophyceae（77）,Dinophyceae（19）,Cyanophyceae（15）,Chlorophyceae（10） and Chrysophyceae（3） were *** phytoplank.on cell abundance varied from 0.290 to 111.662 cells/cm-3,with peak.diversity（3.38 bits/ind.） during summer *** maximum abundance was found during summer season coinciding with the stable hydrographical *** seasonal distribution and abundance of phytoplank.on are discussed in relation to hydrographical *** Correspondence Analysis（CCA） was applied in this paper for discriminating environmental factors having effect on phytoplank.on community at species *** 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.

关键词： physico-chemical parameters phytoplank.on species composition abundance diversity Coleroon coastal waters

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