赣江上游流域丰水期大型底栖动物群落的分布特征

2009年6—7月间从赣江上游流域的70个采样点共采集到大型底栖动物33种,其中软体动物门23种、环节动物门7种、节肢动物门3种,主要优势种为河蚬(Corbicula fluminea)和耳型河螺(Rivularia auriculata).为了较好地了解大型底栖动物的群落分布特征,根据支流汇流和生境状况,将上游流域划分成6个区域.对6个区域的多样性、多维尺度等的分析结果表明,不同区域间大型底栖动物的群落结构组成存在明显差异,其中受人为扰动最小的区域采集得到的底栖动物种类数最多,丰度和生物量最高,Shannon-Wiener多样性指数和Pielou均匀度指数均处于最高水平.

Distribution Characteristics of Macrobenthos in Wet Season in Upper Ganjiang River Basin

33 macrobenthos including 23 mollusks,7 annelids and 3 arthopods were recorded from 70 sample stations in upper Ganjiang River basin during June and July in 2009.The dominant species were Corbicula fluminea and Rivularia auriculata.According to the confluence and habitat of branches,upper Ganjiang River basin was divided into 6 areas for understanding the distribution characteristics of macrobenthos community.Analyses on diversity,multidimensional scaling and other factors indicate that the different areas have different structures of macrobenthos community.However,among all 6 areas,the area with the least anthropogenic disturbance had the largest number of species,the highest abundance and biomass,the highest Shannon-Wiener diversity index and Pielou evenness index.