生态环境学报2023，Vol.32Issue(10)：1794-1801,8.DOI:10.16258/j.cnki.1674-5906.2023.10.008
柳江不同河网位置大型底栖动物群落特征及其影响因子差异比较研究
Differences in Benthic Macroinvertebrate Communities and Their Driving Forces between the Edge and Center Positions of the Liujiang River Network
摘要
Abstract
Understanding differences in aquatic biodiversity and its driving forces among various river network positions is valuable for guiding effective conservation practice.Although some researchers addressed this question,most studies focused on comparing differences in the number of species(i.e.,species richness),without considering differences in the distribution pattern of communities and their related factors.In the present study,the positions of the river network were divided into the edge of the river network and the center of the river network.we surveyed the diversity of benthic macroinvertebrates in the Liujiang River network and compared differences in macroinvertebrate species richness,density,dominant taxonomic units,and community compositions between the edge and center position sites of the river network,as well as differences in relationships between community compositions and environmental and spatial factors.We found that a total of 132 taxonomic units of benthic macroinvertebrates were collected in this survey,among which 109 taxonomic units of insecta were the dominant units.The average taxonomic units(32)and community density(2.29×103 ind·m-2)of benthic macroinvertebrates at the edge sites were both higher than those of the center sites(average taxonomic units:22,community density:1.04×103 ind·m-2).There were 12 taxonomic units with an average abundance higher than 1%.Among these dominant units,the average relative abundances of Ephemeroptera were higher at the edge sites,while Chironomidae were more abundant at the center sites.Dissolved oxygen and water depth affected macroinvertebrate communities across all surveyed sites.In addition,community compositions were also influenced by chemical oxygen demand at the edge sites and by total nitrogen and flow velocity at the center sites.Both environmental and spatial distances influenced β diversity of benthic macroinvertebrates at the edge sites,while β diversity at the center sites was mainly driven by environmental distance.Our findings suggest that different conservation strategies should be implemented for the edge and center positions within the Liujiang River network to protect benthic macroinvertebrate biodiversity.关键词
河网位置/大型底栖动物/环境因子/空间因子/生物多样性/β多样性/群落格局Key words
river network positions/benthic macroinvertebrate/environmental factors/spatial factors/biodiversity/β diversity/community pattern分类
资源环境引用本文复制引用
周佳诚,宋志斌,苗芃,谭路,唐涛..柳江不同河网位置大型底栖动物群落特征及其影响因子差异比较研究[J].生态环境学报,2023,32(10):1794-1801,8.基金项目
国家科技基础资源调查专项(2019FY101900) （2019FY101900）
国家自然科学基金项目(32071589) （32071589）
