This study developed a spatially explicit framework to support the conservation of Western Brook Lamprey Lampetra richardsoni and Pacific Lamprey Entosphenus tridentatus in the Umpqua River basin, Oregon. This framework identified locations within the river network likely to support “potential burrowing habitat” for lamprey larvae based on geomorphic conditions and evaluated the overlap of potential burrowing habitat with water temperatures suitable for the nonnative, piscivorous Smallmouth Bass Micropterus dolomieu. The study also documented reach‐scale factors that create heterogeneity in potential burrowing habitat to guide on‐the‐ground habitat restoration. Based on criteria for mean annual suspended sediment loads and channel slope, 18% of the Umpqua River network was classified as potential burrowing habitat. Existing mean August water temperatures of ≥20°C were suitable for Smallmouth Bass for 32% of the potential burrowing habitat. This percentage increased to 41% of the potential burrowing habitat using projected mean August water temperatures for year 2040, suggesting that water temperatures in the future will facilitate upstream expansion of Smallmouth Bass into the potential burrowing habitat. At finer spatial scales, potential burrowing habitat was influenced by channel features, such as large wood, pools, and local channel slope and width. These results provide an initial template for identifying locations in river networks likely to have potential burrowing habitat, considering the overlap between threats and lamprey habitats, and planning conservation actions to support native lampreys.

中文翻译：

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俄勒冈Umpqua流域南Lamp幼虫的河网和栖息地规模控制

这项研究建立了一个空间明确的框架，以支持俄勒冈州安普夸河流域的西部布鲁克·兰佩雷Lampetra richardsoni和太平洋南Lamp鳗Entosphenus tridentatus的保护。该框架根据地貌条件，确定了河网中可能支持七lamp鱼幼体“潜在洞穴栖息地”的位置，并评估了潜在洞穴栖息地与水温的重叠情况，水温适合于非原生的，有鱼食的小嘴鲈鱼Micropterus dolomieu。该研究还记录了在潜在的洞穴生境中造成异质性的规模尺度因素，以指导地面生境的恢复。根据年平均悬浮泥沙负荷和河道坡度的标准，Umpqua河网的18％被归类为潜在的洞穴栖息地。对于32％的潜在洞穴栖息地，现有的8月平均水温≥20°C适用于小嘴鲈鱼。使用预计的2040年8月平均水温，该百分比增加到潜在洞穴生境的41％，这表明未来的水温将促进Smallmouth Bass上游向潜在洞穴生境的扩展。在更精细的空间尺度上，潜在的洞穴栖息地受到河道特征的影响，例如大木材，水池以及当地河道的坡度和宽度。