Murugesan P, Ajithkumar T T, Khan S Ajmal, Balasubramanian T
Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai 608 502, India.
J Environ Biol. 2009 Sep;30(5 Suppl):865-70.
An attempt was made to find out the impact of shrimp farm discharges on benthic diversity in the discharge point of a shrimp farm. The duration of the study was one culture period right from stocking to harvest. The results revealed that the values of environmental entities were in the safe levels. As regards nutrients, maximum value of TOC and phosphorus were recorded in the sample collected after harvest and minimum in the sample collected during culture. BIO-ENV method revealed that nitrogen, sediment salinity and TOC were manifested as best variable combination explaining faunal distribution. Polychaetes are the dominant group (50%) with 13 species followed by crustaceans (32%) with 10 species, gastropods (10%) with 2 species and bivalves (8%) with 3 species. The faunal density was found to vary in relation to months as observed in the samples which were collected during various seasons in the other areas of estuary. In line with this, diversity values were also paralleled to the faunal density. In a nut shell, the study revealed no negative impact of shrimp farming to the estuarine benthic biota.
本研究旨在探究虾塘排放物对虾塘排放点底栖生物多样性的影响。研究时长为一个养殖周期，即从放苗到收获。结果显示，环境指标值均处于安全水平。就营养物质而言，总有机碳（TOC）和磷的最大值出现在收获后采集的样本中，最小值出现在养殖期间采集的样本中。BIO-ENV方法表明，氮、沉积物盐度和TOC是解释动物群落分布的最佳变量组合。多毛类是优势类群（占50%），有13个物种，其次是甲壳类（占32%），有10个物种，腹足类（占10%），有2个物种，双壳类（占8%），有3个物种。在河口其他区域不同季节采集的样本中观察到，动物群落密度随月份变化。与此一致的是，多样性值也与动物群落密度平行。简而言之，该研究表明对虾养殖对河口底栖生物群没有负面影响。
