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Canada lynx use of burned areas: Conservation implications of changing fire regimes

机译:加拿大山猫对火烧区的使用:改变火势的保护意义

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摘要

A fundamental problem in ecology is forecasting how species will react to major disturbances. As the climate warms, large, frequent, and severe fires are restructuring forested landscapes at large spatial scales, with unknown impacts on imperilled predators. We use the United States federally Threatened Canada lynx as a case study to examine how predators navigate recent large burns, with particular focus on habitat features and the spatial configuration (e.g., distance to edge) that enabled lynx use of these transformed landscapes. We coupled GPS location data of lynx in Washington in an area with several recent large fires and a number of GIS layers of habitat data to develop models of lynx habitat selection in recent burns. Random Forest habitat models showed lynx‐selected islands of forest skipped by large fires, residual vegetation, and areas where some trees survived to use newly burned areas. Lynx used burned areas as early as 1 year postfire, which is much earlier than the 2–4 decades postfire previously thought for this predator. These findings are encouraging for predator persistence in the face of fires, but increasingly severe fires or management that reduces postfire residual trees or slow regeneration will likely jeopardize lynx and other predators. Fire management should change to ensure heterogeneity is retained within the footprint of large fires to enable viable predator populations as fire regimes worsen with climate change.
机译:生态学中的一个基本问题是预测物种对重大干扰的反应。随着气候变暖,大范围,频繁和严重的大火正在大面积改造森林景观,对受威胁的掠食者造成未知的影响。我们以美国联邦受威胁的加拿大山猫为例,研究掠食者如何应对最近的大火,特别关注栖息地特征和空间配置(例如,到边缘的距离),以使山猫能够使用这些变迁的景观。我们将华盛顿地区天猫座的GPS位置数据与最近发生的几次大火以及许多GIS栖息地数据层相结合,以开发近期烧伤中的天猫座栖息地选择模型。随机森林栖息地模型显示,山猫选定的森林岛屿被大火,残留的植被和一些树木幸存下来的区域用于新烧的区域而跳过。山猫早在大火后一年就使用了火烧区域,这比此前认为的捕食者大火后的2-4年要早得多。这些发现对于捕食者在大火面前的持久性是令人鼓舞的,但是日益严重的大火或减少火后残留树木或缓慢再生的管理措施可能会危害山猫和其他捕食者。应对火灾进行管理,以确保在大火覆盖的区域内保持异质性,以使捕食者种群得以生存,因为随着气候变化,火灾情况恶化。

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