论文部分内容阅读
在渤海的 3个典型站位 B1、E5和 E1 ,以 3个不同采样时期的沉积物样品 ( 1 997年 6月、1 998年 9～ 1 0月份和 1 999年 4～ 5月份 ) ,研究了渤海自由生活海洋线虫的种类组成变化。结果表明 :自由生活海洋线虫的摄食类型比例在同一个站位 3次不同采样均有变化 ,其中 B1站和 E5站 3个采样时期表现为 3种不同的摄食类型分布 ;将线虫分为 3个时期所进行的年龄结构和雌雄比研究表明 ,在线虫群落中幼龄个体一般占到线虫群落总数的一半以上 ;对 3个站位线虫群落的多样性研究表明 ,离黄河口最近的 B1站 ,出现种类数量最少 ,位于渤海中部的 E5站 ,出现种类数量较多 ;3个不同采样时期的比较 ,以 1 997年 6月份群落中出现的种类数最多 ,1 999年 4～ 5月份出现的最少。对其群落结构的分析表明 ,同一个站位不同采样时期 ,优势种的类型基本相同 ,变化主要表现在优势种丰度大小的差异 ,其群落组成结构相对稳定
In the three typical stations B1, E5 and E1 in the Bohai Sea, sediment samples of three different sampling periods (June 1997, September-January 1998 and April-May 1999) were studied The species composition changes of marine nematodes in the free-living Bohai Sea. The results showed that the proportion of feeding species of free-living marine nematodes changed in three different sampling sites at the same station, among which, three sampling periods were distributed in B1 and E5, and the distribution of nematodes was divided into three The results of age structure and sex ratio showed that young individuals in the nematode community account for more than half of the total nematode community. Studies on the diversity of nematode communities at the three stations show that the B1 station closest to the Yellow River Estuary, The number of species appeared the least in E5 station located in the middle of Bohai Sea, and the number of species appeared more. The number of species appeared in the community in June 1997 was the highest compared with that in the three different sampling periods, and it was the least in April-May 1999 . The analysis of its community structure shows that the types of dominant species are basically the same in different sampling periods of the same station. The changes are mainly manifested in the differences in abundance of dominant species and the relatively stable composition of community structure