Rajkumar M, Perumal P, Prabu V Ashok, Perumal N Vengadesh, Rajasekar K Thillai
Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai-608 502, India.
J Environ Biol. 2009 Jul;30(4):489-98.
The results of an investigation carried out during September 2002 to August 2003 on hydrography, composition and community structure of phytoplankton including chlorophyll 'a' (Chl-a) content and primary productivity (PP) of the Pichavaram mangrove (South-east coast of India) are reported. Atmospheric and surface water temperatures varied from 30.0 to 34.8 degrees C and from 29.7 to 34.2 degrees C respectively while the light extinction coefficient values (LEC) (K) ranged between 3.2 and 14.9. Salinity values varied from 9.6 to 35.4 per thousand and the pH ranged between 7.2 and 8.6. Variation in dissolved oxygen content was from 3.2 to 6.5 ml l(-1). The ranges of inorganic nutrients viz., nitrate, nitrite, phosphate and silicate were: 7-36.23, 0.31-5.46, 0.28-3.70 and 12.26-56 64 microM respectively Chlorophyll 'a' content ranged between 0.20 and 105.60 microg l(-1) and the ranges of gross and net primary productivities (PP) were: 16.54-826.8 and11.52-610.2 mg Cm(-3) hr(-1) respectively. Presently a total of 94 species of phytoplankton were identified. Among these, the diatoms formed predominant group. Population density of phytoplankton varied from 400 to 3,21,000 cells(-1). While the peak diversity (5.23 bits/ind.) of the phytoplankton was observed during summer season, the maximum population density was found during summer season coinciding with the stable hydrographical conditions.
本文报道了2002年9月至2003年8月期间对印度东南海岸皮查瓦拉姆红树林的水文状况、浮游植物组成和群落结构（包括叶绿素“a”（Chl-a）含量和初级生产力（PP））进行调查的结果。大气温度和地表水温度分别在30.0至34.8摄氏度和29.7至34.2摄氏度之间变化，而光消光系数值（LEC）（K）在3.2至14.9之间。盐度值在千分之9.6至35.4之间变化，pH值在7.2至8.6之间。溶解氧含量的变化范围为3.2至6.5毫升/升。无机营养物即硝酸盐、亚硝酸盐、磷酸盐和硅酸盐的范围分别为：7 - 36.23、0.31 - 5.46、0.28 - 3.70和12.26 - 56.64微摩尔/升。叶绿素“a”含量在0.20至105.60微克/升之间，总初级生产力和净初级生产力（PP）的范围分别为：16.54 - 826.8和11.52 - 610.2毫克碳/立方米·小时。目前共鉴定出94种浮游植物。其中，硅藻形成了优势类群。浮游植物的种群密度在400至321000个细胞/升之间变化。虽然浮游植物的峰值多样性（5.23比特/个体）在夏季观察到，但最大种群密度在夏季出现，与稳定的水文条件一致。
