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题名: Effects of loss of lateral hydrological connectivity on fish functional diversity
作者: Liu, Xueqin1; Wang, Hongzhu1
关键词: biodiversity conservation ; fish assemblage ; functional alpha diversity ; functional beta diversity ; Yangtze River floodplain
刊名: CONSERVATION BIOLOGY
发表日期: 2018-12-01
DOI: 10.1111/cobi.13142
卷: 32, 期:6, 页:1336-1345
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Biodiversity Conservation ; Ecology ; Environmental Sciences
研究领域[WOS]: Biodiversity & Conservation ; Environmental Sciences & Ecology
英文摘要: Loss of lateral hydrological connectivity (LHC) is a major cause of biodiversity decline in river floodplains, yet little is known about its effects on aquatic functional diversity in these ecosystems. We quantified functional alpha and beta diversity of fish assemblages in Yangtze River floodplain lakes and explored their responses to loss of LHC with generalized linear mixed models. Functional richness was much lower in lakes that were not connected to the Yangtze River (i.e., disconnected lakes), where functional evenness and divergence were higher. LHC was the most important factor shaping fish diversity patterns in this region. Predicted reductions in functional richness and taxonomic richness due to LHC loss were higher for functional richness (0.47-0.82) than taxonomic richness (0.32) for all species assemblages except nonmigratory species. The distribution of functional strategies of migratory and nonmigratory fishes was highly uneven throughout the floodplain. Taxonomic beta diversity was much higher than functional beta diversity. The former was due mainly to spatial turnover (73.6-83.8%), which suggested that dissimilarity of diversity among fish assemblages was largely induced by species replacement. The latter was induced by the nestedness-resultant component of overall beta diversity (70.7-86.0%), which indicated a high degree of function loss without replacement. Both taxonomic and functional beta diversity were higher in disconnected lakes, where they were significantly correlated with fishing activity and water quality, than in river-connected lakes. We showed for the first time the effects of loss of LHC on fish functional diversity in large river floodplains. We found a serious decline of fish functional richness in the Yangtze floodplain, and functional diversity remained highly vulnerable to loss of LHC even though this is a species-rich ecosystem.
关键词[WOS]: RIVER-FLOODPLAIN CONNECTIVITY ; BETA-DIVERSITY ; COMMUNITY ; CONSERVATION ; BIODIVERSITY ; RESTORATION ; REDUNDANCY ; RESPONSES ; REVEALS ; THREATS
语种: 英语
项目资助者: National Natural Science Foundation of China(41371054) ; National Basic Research Program of China(2015CB458900)
WOS记录号: WOS:000449856900011
ISSN号: 0888-8892
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/56068
Appears in Collections:淡水生态学研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
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