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Fragmentation of lateral connectivity and fish population dynamics in large rivers
Fish and Fisheries ( IF 6.7 ) Pub Date : 2022-01-23 , DOI: 10.1111/faf.12641
Rick J. Stoffels 1 , Paul Humphries 2 , Nick R. Bond 3 , Amina E. Price 2
Affiliation  

Lateral Hydrological Connectivity (LHC) has been extensively fragmented in river–floodplain ecosystems of the world. Uncertainties about how LHC affects fishes are great, impeding the design of effective rehabilitation strategies. Existing conceptual frameworks do not provide sufficient mechanistic detail to support the novel decision problems river managers face. We offer a framework of how LHC affects fishes in river–floodplain ecosystems that is, process-based, integrates all life-stages and is spatial; these features, we argue, are required to assess risks and opportunities associated with different LHC rehabilitation strategies. Within river–floodplain segments, LHC affects population processes through five ‘effect-classes’: effects of floodplain habitat (1) and channel habitat (2); effects of material subsidies from the floodplain to the channel (3) and vice versa (4); and effects of connectivity on lateral dispersal (5). The relative influence of these effect-classes on processes varies among species and life-stages. At the scale of the drainage basin, inter-segment variation in geomorphology generates a longitudinal source-sink structure to habitat quality and quantity, pointing to a need to better understand fish metapopulation dynamics in river–floodplain ecosystems. Given the significant investment in trying to restore river–floodplain ecosystems, we highlight potentially costly and ineffective LHC management decisions. These include certain heavily engineered LHC rehabilitation strategies that do not promote critical population processes at a local scale, and at basin scales implementing strategies that do not facilitate the metapopulation processes that promote species’ persistence.

中文翻译:

大河流横向连通性和鱼类种群动态的碎片化

横向水文连通性 (LHC) 在世界的河流-洪泛区生态系统中被广泛分散。LHC 如何影响鱼类的不确定性很大,阻碍了有效恢复策略的设计。现有的概念框架没有提供足够的机械细节来支持河流管理者面临的新决策问题。我们提供了 LHC 如何影响河流-泛滥平原生态系统中的鱼类的框架,该框架基于过程,整合了所有生命阶段并且是空间的;我们认为,这些特征是评估与不同 LHC 恢复策略相​​关的风险和机遇所必需的。在河流-洪泛区段内,LHC 通过五个“影响等级”影响种群过程:洪泛区栖息地 (1) 和河道栖息地 (2) 的影响;反之亦然(4);以及连通性对横向扩散的影响 (5)。这些效应类别对过程的相对影响因物种和生命阶段而异。在流域范围内,地貌的节段间变化对栖息地质量和数量产生了纵向的源汇结构,这表明需要更好地了解河流 - 泛滥平原生态系统中的鱼类元种群动态。鉴于在试图恢复河流-泛滥平原生态系统方面的重大投资,我们强调了可能成本高昂且无效的 LHC 管理决策。其中包括某些经过精心设计的大型强子对撞机恢复策略,它们不会在局部范围内促进关键种群过程,以及在流域范围内实施不促进促进物种持久性的集合种群过程的策略。
更新日期:2022-01-23
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