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首页> 外文期刊>Journal of the American Water Resources Association >Deep-Seated Landslides Drive Variability in Valley Width and Increase Connectivity of Salmon Habitat in the Oregon Coast Range
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Deep-Seated Landslides Drive Variability in Valley Width and Increase Connectivity of Salmon Habitat in the Oregon Coast Range

机译：深层滑坡驱动山谷宽度变化，并增加俄勒冈州沿海地区鲑鱼栖息地的连通性

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摘要

Declines in populations of Pacific salmon have prompted extensive and costly restoration efforts, yet many populations are still in peril. An improved understanding of landscape-scale controls on salmon habitat should help focus restoration resources on areas with the greatest potential to host productive habitat. We investigate the contribution of deep-seated landslides (DSLs) to Coho Salmon habitat by comparing the quantity and connectivity of potential seasonal habitat observed in five streams with extensive DSLs to five lacking significant landsliding. Further, we measure valley width in these streams and relate it to connectivity. We show that median fractions of stream length identified as spawning, summer-rearing, winter-refuge habitat, and as having high connectivity among seasonal habitat types are greater in streams with DSLs and that distances between units of each seasonal habitat type are significantly lower in DSL terrain. The median R-2 value for the relationship between drainage area and valley width is lower in landslide terrain and we observed that high connectivity among seasonal habitat types tends to occur where valley width is variable. Our results suggest that DSLs promote connectivity among seasonal habitat types for Coho Salmon and that prioritizing restoration projects in streams in DSL terrain could improve the effectiveness of salmonid recovery programs.
机译：太平洋鲑鱼种群的减少促使人们进行了广泛而昂贵的修复工作，但许多种群仍处于危险之中。更好地了解鲑鱼生境的景观尺度控制，应有助于将恢复资源集中在最有可能容纳生产性生境的地区。我们通过比较五个广泛的DSL与五个缺乏明显滑坡的溪流中观察到的潜在季节性栖息地的数量和连通性，研究了深层滑坡（DSL）对Coho Salmon栖息地的贡献。此外，我们测量这些溪流中的谷宽并将其与连通性联系起来。我们发现，带DSLs的河流中，被确定为产卵，夏季抚育，冬季避难所栖息地以及季节性栖息地类型之间具有高连通性的河流长度的中值部分更大，而每种季节性栖息地类型的单位之间的距离显着降低。 DSL地形。在滑坡地形中，流域面积与河谷宽度之间关系的中值R-2值较低，并且我们观察到在河谷宽度可变的情况下，季节性生境类型之间往往会出现高连通性。我们的研究结果表明，DSL促进了Coho Salmon季节性生境类型之间的连通性，并且优先考虑DSL地形中溪流的恢复项目可以提高鲑鱼恢复计划的效率。

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