湖泊科学2024，Vol.36Issue(5)：1447-1458,12.DOI:10.18307/2024.0531
衡水湖鱼类群落及多样性的时空差异以及与水环境因子的关系
Spatiotemporal patterns of fish communities and diversity in Lake Hengshui and their rela-tionships with water environmental factors
摘要
Abstract
Community structure and diversity of fish exhibit a strong correlation with environmental variables.We studied the spatial and temporal patterns of the fish community structure and diversity in both the small and main lake regions of Lake Hengshui throughout 2021.The relationships between fish community structure and environmental factors were analyzed.A total of 29 fish species across 15 families and 27 genera were recorded in Lake Hengshui.Cyprinid species contributed 98％to the total catch by weight.The dominant fish species in Lake Hengshui were Hemiculter leucisculus,Carassius carassius,Hypophthalmus molitrix and Pseudobrama simoni.There were no seasonal and spatial variations in Shannon-Wiener diversity index,Pielou's evenness index and Margalefs species richness index of fishes in the main region of the lake.However,permutational multivariate analysis highlighted significant temporal variations in fish community structure in the main lake region.Similarity percentage analysis revealed an aver-age seasonal difference over 40％in fish communities of the main lake,the spatial difference of fish community structure between the main lake and small lake regions was 41％.The abundance-biomass curve indicated that fish communities in the main lake re-gion was largely disturbed in all sampling seasons.In the small lake region,these disturbances were only observed in spring and summer,while not in autumn.Redundancy analysis indicated that the epilimnetic total phosphorus of the main lake explained most of fish community changes(36％).Total phosphorus,nitrite,secchi depth and total nitrogen were also the main contributors which influencing the fish community structure of the main lake.The fish community structure of Lake Hengshui is dominated by small omnivorous fish,such as H.leucisculus,C.carassius and P.simoni,while the abundance of piscivorous fish is relatively low.Therefore,in the context of enhancing water quality and ecological restoration,after the reduction of external nutrient loads,it is important to manipulate the fish community structure of Lake Hengshui.This involves strengthening the top-down effect by carnivo-rous fish,mitigating the potential adverse impacts of omnivorous fish and planktivorous fish on water quality,ultimately working to-wards the objective of improving water quality.关键词
温带湖泊/鱼类调控/生态修复/富营养化/鱼类群落结构Key words
Temperate lakes/fish regulation/ecological restoration/eutrophication/fish community structure引用本文复制引用
陈浩东,刘正文,于谨磊,张韩,付适,林镇美,刘成,陈开宁,张余广,毛志刚,梅雪英..衡水湖鱼类群落及多样性的时空差异以及与水环境因子的关系[J].湖泊科学,2024,36(5):1447-1458,12.基金项目
国家自然科学基金项目(42277067)和国家重点研发计划项目(2023YFC3208705)联合资助. （42277067）
