北部湾雷州近海春、夏季鱼类群落结构初探

根据2005年4月、7月和8月在北部湾雷州近海进行的渔业资源刺网和底拖网调查,对该海域春、夏季鱼类群落结构进行了初步研究.结果表明,银鲳(Stromateoides argenteus)是当地绝对的优势种,其它鱼类优势种随区域和季节有着较大的差异.分别计算了北部湾雷州近海春、夏季鱼类生物多样性指数的种类丰度指数(R)、多样性指数(H')、均匀度指数(J').聚类分析表明该水域鱼类群落结构存在一定程度的时空异质性,但空间异质性不如时间异质性明显.此外,不同群落中的鱼类呈现出不同的生态型特征.同时部分结果表明,在不同网具的调查下,有的结果会出现较大变化.

Preliminary study on fish community structure in the coastal waters of Leizhou in Beibu Gulf during spring and summer

Based on the gillnet surveys and bottom trawl surveys in the coastal waters of Leizhou in Beibu Gulf in April,June and July,2005,the fish community structure was analyzed.The preliminary results indicated that silver pomfret(Stromateoides argenteus) was the most dominant species in this area,while other dominant species varied with changing waters and seasons.Moreover,calculations of the species richness R,Shannon diversity index H' and evenness index J' were respectively made for the fish community in spring and summer in this area.In addition,cluster analysis revealed that fish community structure existed,spatial and temporal heterogeneity to some extent,with the temporal heterogeneity more obvious than the spatial heterogeneity.And different ecotypes showed among different fish communities.Furthermore,a portion of datum showed that some results greatly varied with the nets that we used.