水生生物学报2025，Vol.49Issue(10)：60-76,17.DOI:10.3724/1000-3207.2025.2024.0489
梯级开发对河流中下游大型底栖动物群落结构的影响
THE IMPACT OF CASCADE DEVELOPMENT ON THE COMMUNITY STRUC-TURE OF MACROZOOBENTHOS IN THE MID-LOWER REACHES AND CONFLUENCE AREAS OF RIVERS
摘要
Abstract
Cascade development transforms natural rivers into continuous river-reservoir ecosystems,altering the communities of aquatic organisms.To understand these changes,we conducted field surveys in the mid-lower reaches of the Hanjiang River during the dry and wet seasons of 2023,combined with historical data from the Wuhan reach of the Yangtze River mainstem.This study compared the community composition of macrozoobenthos across different habitats and seasons,investigated their response to longitudinal connectivity,and analyzed influencing factors.A total of 132 taxa of macrozoobenthos were recorded.From the mid-lower Hanjiang River to the Wuhan reach of mainstem,taxa number and density generally declined but slightly recovered in the confluence zone.The lake zone and the transi-tion zone exhibited higher taxa number and standing crops,while the mainstem zone had the lowest.The community structure showed a parabolic response to longitudinal connectivity,with total taxa number and Shannon-Wiener diver-sity index peaking at intermediate connectivity levels(0.95-0.97)during the wet season.The highest community simi-larity was observed between the lake zone and the confluence zone,whereas the mainstem significantly differed from other habitats(P<0.05).The community composition differences among different habitats during the wet season(P=0.025)were greater than those during the dry season(P=0.038),and there was a highly significant difference between the dry and wet seasons(P=0.001).Seasonal variations(P=0.001)were greater than habitat variations(P=0.015).During the dry season,water temperature and dissolved oxygen dominated the distribution of communities,whereas it was regulated by transparency and longitudinal connectivity during the wet season.This study demonstrates that cascade development reshapes communities of the macrozoobenthos by altering longitudinal connectivity and hydrological regimes,with the confluence zone serving as a critical ecotone in maintaining regional biodiversity.关键词
梯级开发/纵向连通性/大型底栖动物/汇流区/汉江Key words
Cascade development/Longitudinal connectivity/Macrozoobenthos/The confluence zone/Hanjiang River分类
农业科技引用本文复制引用
索雨泽,高文娟,赵永晶,崔永德,和雅静..梯级开发对河流中下游大型底栖动物群落结构的影响[J].水生生物学报,2025,49(10):60-76,17.基金项目
国家重点研发计划(2021YKC3200103) （2021YKC3200103）
国家自然科学基金重点项目(52039006)资助Supported by the National Key Research and Development Program of China(2021YKC3200103) （52039006）
National Natural Science Foundation of China Key Program(52039006) （52039006）
