River‐reservoir interfaces have been described as aquatic ecotones and contain strong environmental gradients of depth, turbidity and trophic resource abundance. These transitional habitats have traditionally been excluded by riverine and reservoir management schemes despite their prevalence in modern riverscapes. By systematically sampling shoreline habitats along a river‐reservoir interface gradient from riverine to lacustrine zones with trammel nets in 2018–2019, strong patterns were identified in total species captured and individuals captured in the San Juan River‐Lake Powell inflow, USA. Changes in assemblage structure were driven mainly by increases in relative abundance of benthic omnivores towards the riverine zone, including imperiled razorback sucker, Xyrauchen texanus (Abbott), but also by increases in predatory species, such as striped bass, Morone saxatilis (Walbaum). Inter‐annual variation in species distributions along the river‐reservoir interface gradient was likely influenced by variation in reservoir water level that differed by nearly 12 m between years. River‐reservoir interfaces provide high‐quality feeding and potentially spawning areas for both benthic omnivores and piscivores, and these areas should be considered in management and conservation efforts for species using these habitats.

中文翻译：

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跨水生过渡带的水库鱼类组合结构：河水库界面能否提供保护和管理机会？

河流-水库界面被描述为水生生态交错带，并包含深度，浊度和营养资源丰富度的强烈环境梯度。尽管这些过渡性生境在现代河流景观中十分盛行，但传统上一直被河流和水库管理计划所排除。通过在2018-2019年期间从沿河流到水库界面梯度的河流-水库界面坡度系统地取样，并使用松木网，在美国圣胡安河-鲍威尔湖入流中捕获的总物种和捕获的个体中发现了强烈的格局。组合结构的变化主要是由底栖杂食动物向河沿带相对丰富度的增加所驱动的，这些杂食动物包括受害的剃刀背吸盘Xyrauchen texanus（Abbott），也可以通过增加掠食性物种，例如条纹鲈，Morone saxatilis（Walbaum）来实现。沿河—水库界面梯度的物种分布年际变化很可能受到水库水位变化的影响，每年之间相差近12 m。河流水库接口为底栖杂食动物和食肉动物提供了高质量的觅食和潜在产卵区，在使用这些生境的物种的管理和保护工作中应考虑这些区域。