Kumar C Santhosh, Perumal P
Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai-608502, India.
J Environ Biol. 2012 May;33(3):585-9.
Physico-chemical variables in the marine environment are subjected to wide spatio-temporal variations. The various physico-chemical parameters viz: temperature, salinity, pH, dissolved oxygen and nutrients of the environment are the factors which mainly influence the production and successful propagation of planktonic life in the coastal biotopes. The ranges of values of surface water temperature (0 degrees C), salinity (per thousand), pH and dissolved oxygen (ml l(-1)) were: 25.5 - 33.4; 23 - 35; 7.8 - 8.2; 3.6 - 5.2, respectively. The values (microg l(-1)) of nutrients were: nitrate 3.21 - 6.34, nitrite 0.74 - 0.896, phosphate 0.22 and 1.16, silicate 24.85 - 61.92 and ammonia 0.05 - 0.32. The recorded values of primary productivity (mgcm(-3)hr(1)) ranged between 16 - 116 and the chlorophyll "a" varied from 3.74 - 8.52. A total number of 51 species of phytoplankton representing different classes viz: Bacillariophyceae (40); Dinophyceae (8); Chlorophyceae (1) and Cyanophyceae (2) was recorded. Among the four classes, Bacillariophyceae appeared to be the dominant group in respect of total species and cell numbers. The population density of phytoplankton was high during summer season and quite low during monsoon season.
海洋环境中的物理化学变量存在广泛的时空变化。环境中的各种物理化学参数，即温度、盐度、pH值、溶解氧和营养物质，是主要影响沿海生物群落中浮游生物生存和成功繁殖的因素。地表水温度（℃）、盐度（千分之一）、pH值和溶解氧（ml l⁻¹）的取值范围分别为：25.5 - 33.4；23 - 35；7.8 - 8.2；3.6 - 5.2。营养物质的值（μg l⁻¹）为：硝酸盐3.21 - 6.34、亚硝酸盐0.74 - 0.896、磷酸盐0.22和1.16、硅酸盐24.85 - 61.92以及氨0.05 - 0.32。记录的初级生产力值（mg cm⁻³ h⁻¹）在16 - 116之间，叶绿素“a”在3.74 - 8.52之间变化。共记录了51种浮游植物，分属于不同的类别，即：硅藻门（40种）；甲藻门（8种）；绿藻门（1种）和蓝藻门（2种）。在这四个类别中，就总物种数和细胞数量而言，硅藻门似乎是优势类群。浮游植物的种群密度在夏季较高，在季风季节相当低。
