厦门浔江湾小型底栖生物数量分布及生态意义

本文首次报道 1 998年 5月厦门浔江湾水域 5个测站小型底栖生物调查的初步结果。小型底栖动物的平均密度为 5 9.6 5个 /cm2 ,自由生活的海洋线虫是优势类群 ,占总密度的 89.2 8% ;其次 ,底栖桡足类占 2 .76 % ;其它类群所占比例较少。小型底栖生物的丰度分布为湾口区底 ,湾中部高。文中分析了小型底栖生物具有高类群优势度和低类群多样性特征 ,以及线虫与桡足类的丰度比率与环境的关系 ,提出浔江湾水域环境状况应引起重视。

Distribution of abundance on meiobethos and its ecological significance in Xunjiang Bay, Xiamen

This article presents the result of preliminary analyses of meiobenthos in May of 1998 in Xunjiang Bay, Xiamen. The average density of meiobenthos was 59.65ind./cm 2, 89.28% of the total meiofauna is Fee living marinenematoes, benthic copepos were the second (for 2.76% ), and other taxas account for a few in the composition of total numbers. The distributions of the density of meiobenthos are higher in centre of the bay than in the entrance of bay. The characteristics of meiobenthos are lower taxonic diversity ( d ) and higher taxonic dominancy ( C ) in Xunjiang Bay, an the ratio Nematoa to Copepoda ( R ) are analysed, and problem of envionmental is emphasized in the Bay.