Effects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions

Low-head dams are a ubiquitous human disturbance in headwater streams. The effects of low-head dams on stream fish assemblages have gathered increasing interest in the past 20 years; whereas, the effects remain controversial among the existing studies. In this study, we collected fishes from 58 impo...

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Autores principales:	Qiang Li, Yuru Li, Mengdie Jiang, Yongxiang Wang, Dongpo Xu, Ling Chu, Yunzhi Yan
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Low-head dam Fish community Taxonomic diversity Functional diversity Community turnover Community nestedness Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/90c0e5780fe24bef8186074aac3b04b2
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spelling	oai:doaj.org-article:90c0e5780fe24bef8186074aac3b04b22021-12-01T04:38:07ZEffects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions1470-160X10.1016/j.ecolind.2020.107190https://doaj.org/article/90c0e5780fe24bef8186074aac3b04b22021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20311298https://doaj.org/toc/1470-160XLow-head dams are a ubiquitous human disturbance in headwater streams. The effects of low-head dams on stream fish assemblages have gathered increasing interest in the past 20 years; whereas, the effects remain controversial among the existing studies. In this study, we collected fishes from 58 impoundments created by low-head dams and 58 reference free-flowing segments below or above dams within headwater streams of four basins in Wannan Mountains, China. We used the beta diversity, including taxonomic and functional indices based on species composition and species traits, respectively, to quantify the degree to which fish assemblages were altered by low-head dams by comparing pairwise assemblages between impoundment and reference free-flowing segment for each dam surveyed. We aimed to assess whether taxonomic and functional beta diversities varied across the 58 low-head dams surveyed and how beta diversities related to local habitat, landscape conditions, and dam size measures. We found that both taxonomic and functional beta diversities showed quite high spatial variation, with the coefficient of variance of 54.47% and 76.74%, which were dominated by species turnover (68.8%) and functional nestedness (62.8%), respectively. Taxonomic beta diversity, functional beta diversity and functional turnover rate significantly varied across basins, and taxonomic turnover and nestedness rates significantly varied between reference types (i.e., free-flowing segments below vs. above dams). We also found that taxonomic beta diversity, functional beta diversity, and functional turnover rates significantly related to local habitat and/or landscape conditions. Environmental factors explained more spatial variances in functional diversity than taxonomic diversity. Our results suggest that the effects of low-head dams on fish assemblages vary spatially across different dams and relates to environmental factors. In addition, our results highlight the need for reliable approaches for assessing the effects of low-head dams on stream fish assemblages.Qiang LiYuru LiMengdie JiangYongxiang WangDongpo XuLing ChuYunzhi YanElsevierarticleLow-head damFish communityTaxonomic diversityFunctional diversityCommunity turnoverCommunity nestednessEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107190- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Low-head dam Fish community Taxonomic diversity Functional diversity Community turnover Community nestedness Ecology QH540-549.5
spellingShingle	Low-head dam Fish community Taxonomic diversity Functional diversity Community turnover Community nestedness Ecology QH540-549.5 Qiang Li Yuru Li Mengdie Jiang Yongxiang Wang Dongpo Xu Ling Chu Yunzhi Yan Effects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions
description	Low-head dams are a ubiquitous human disturbance in headwater streams. The effects of low-head dams on stream fish assemblages have gathered increasing interest in the past 20 years; whereas, the effects remain controversial among the existing studies. In this study, we collected fishes from 58 impoundments created by low-head dams and 58 reference free-flowing segments below or above dams within headwater streams of four basins in Wannan Mountains, China. We used the beta diversity, including taxonomic and functional indices based on species composition and species traits, respectively, to quantify the degree to which fish assemblages were altered by low-head dams by comparing pairwise assemblages between impoundment and reference free-flowing segment for each dam surveyed. We aimed to assess whether taxonomic and functional beta diversities varied across the 58 low-head dams surveyed and how beta diversities related to local habitat, landscape conditions, and dam size measures. We found that both taxonomic and functional beta diversities showed quite high spatial variation, with the coefficient of variance of 54.47% and 76.74%, which were dominated by species turnover (68.8%) and functional nestedness (62.8%), respectively. Taxonomic beta diversity, functional beta diversity and functional turnover rate significantly varied across basins, and taxonomic turnover and nestedness rates significantly varied between reference types (i.e., free-flowing segments below vs. above dams). We also found that taxonomic beta diversity, functional beta diversity, and functional turnover rates significantly related to local habitat and/or landscape conditions. Environmental factors explained more spatial variances in functional diversity than taxonomic diversity. Our results suggest that the effects of low-head dams on fish assemblages vary spatially across different dams and relates to environmental factors. In addition, our results highlight the need for reliable approaches for assessing the effects of low-head dams on stream fish assemblages.
format	article
author	Qiang Li Yuru Li Mengdie Jiang Yongxiang Wang Dongpo Xu Ling Chu Yunzhi Yan
author_facet	Qiang Li Yuru Li Mengdie Jiang Yongxiang Wang Dongpo Xu Ling Chu Yunzhi Yan
author_sort	Qiang Li
title	Effects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions
title_short	Effects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions
title_full	Effects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions
title_fullStr	Effects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions
title_full_unstemmed	Effects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions
title_sort	effects of low-head dams on fish assemblages in subtropical streams: context dependence on local habitat and landscape conditions
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/90c0e5780fe24bef8186074aac3b04b2
work_keys_str_mv	AT qiangli effectsoflowheaddamsonfishassemblagesinsubtropicalstreamscontextdependenceonlocalhabitatandlandscapeconditions AT yuruli effectsoflowheaddamsonfishassemblagesinsubtropicalstreamscontextdependenceonlocalhabitatandlandscapeconditions AT mengdiejiang effectsoflowheaddamsonfishassemblagesinsubtropicalstreamscontextdependenceonlocalhabitatandlandscapeconditions AT yongxiangwang effectsoflowheaddamsonfishassemblagesinsubtropicalstreamscontextdependenceonlocalhabitatandlandscapeconditions AT dongpoxu effectsoflowheaddamsonfishassemblagesinsubtropicalstreamscontextdependenceonlocalhabitatandlandscapeconditions AT lingchu effectsoflowheaddamsonfishassemblagesinsubtropicalstreamscontextdependenceonlocalhabitatandlandscapeconditions AT yunzhiyan effectsoflowheaddamsonfishassemblagesinsubtropicalstreamscontextdependenceonlocalhabitatandlandscapeconditions
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Effects of low-head dams on fish assemblages in subtropical streams: Context dependence on local habitat and landscape conditions

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