珠江流域底栖动物资源的宏观格局

Macro-patterns of Macrozoobenthos Resources in the Pearl River Basin

为填补珠江流域大尺度底栖动物研究的空白,本研究通过结合野外调查数据和相关文献资料,系统分析了珠江流域底栖动物的宏观格局。珠江流域共记录底栖动物562种属,隶属于9门14纲41目173科377属,其中节肢动物383种属、环节动物87种属、软体动物86种属。在物种分布格局方面:东江流域和西江流域底栖动物种类分布最多,北江流域底栖动物种类分布最少;环节动物在珠江三角洲分布最多,软体动物和节肢动物均在东江流域分布最多。在现存量分布格局方面:珠江流域底栖动物平均密度为665 ind/m^(2),以节肢动物占优势,而生物量以软体动物占优势,其平均值为69.29 g/m^(2);底栖动物密度:东江流域>西江流域>珠江三角洲>北江流域;底栖动物生物量:西江流域>北江流域>珠江三角洲>东江流域。

In order to fill the gap in the study of macrozoobenthos in large-scale in the Pearl River Basin,the macro-patterns of macrozoobenthos in the Pearl River Basin were systematically analyzed based on the field investigations and related literatures.A total of 562 taxa(species/genus)were recorded in the Pearl River Basin,which belonged to 9 phyla,14 classes,41 orders,173 families and 377 genera,including 383 arthropods,87 annelids and 86 molluscs.As for the taxon distribution,Dongjiang River sub-basin and Xijiang River sub-basin had more taxa of macrozoobenthos.Pearl River Delta owned more taxa of annelids,while Dongjiang River sub-basin owned more taxa of molluscs and arthropods.In terms of the standing crops distribution,the average density order of macrozoobenthos in the Pearl River Basin was 665 ind·m^(-2),and arthropods were dominant;while molluscs were dominant in biomass,and the average value was 69.29 g·m^(-2).Regarding the density order of macrozoobenthos:Dongjiang River sub-basin>Xijiang River sub-basin>Pearl River Delta>Beijiang River sub-basin;as to the amount order of biomass of macrozoobenthos:Xijiang River sub-basin>Beijiang River sub-basin>Pearl River Delta>Dongjiang River sub-basin.