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首页> 外文期刊>Northwestern Naturalist: a journal of vertebrate biology >MIXED EVIDENCE FOR NICHE CONSERVATISM IN MOUNTAIN BEAVER (APLODONTIA RUFA) LINEAGES
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MIXED EVIDENCE FOR NICHE CONSERVATISM IN MOUNTAIN BEAVER (APLODONTIA RUFA) LINEAGES

机译：山海狸（APLODONTIA RUFA）谱系中生态位保守主义的混合证据

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Range shifts in response to past climatic changes have been documented in a variety of species and have often resulted in the isolation of relict populations.Understanding how these isolated populations develop local adaptations or maintain their historic climatic niche is crucial to creating effective management plans in the face of current climate change.While Mountain Beavers (Aplodontia rufa) have endured through major climatic shifts in the past, they maintain physiological constraints that limit their distribution to cool, humid climates.Increasing temperatures since the last glacial maximum likely had a strong influence in reducing their range.The species now persists as 5 genetically distinct clades, but it is not clear to what extent climatic differences have driven genetic isolation compared to other factors like topography.We compared species-distribution models (SDMs) for the 5 clades of Mountain Beaver to understand whether this species tends towards niche conservatism or adapts to local climates.Presence points from the Global Biodiversity Information Facility were divided into clades and combined with climatic layers from BioClim to develop SDMs for each clade.Niche overlap was then compared to genetic relatedness between all pairings of clades.High temperatures were a limiting factor in distribution for all clades and, despite a low level of niche overlap at broad scales, Mountain Beavers appeared to display some level of niche conservatism.These landscape level SDMs showed that some clades do exist in a warmer climate than other Mountain Beavers; however, fine-scale models for the Point Arena subspecies suggested they persist by selecting the coolest places within that range.This suggests that niche overlap between clades may be higher than what is detected at the coarser scale.Further research is needed to understand the mechanisms limiting the distribution of these subspecies.
机译：在各种物种中都记录了响应过去气候变化的范围变化，并且经常导致孑遗种群的孤立。了解这些孤立的种群如何发展当地适应环境或维持其历史气候生态位，对于在面对当前气候变化时制定有效的管理计划至关重要。虽然山狸（Aplodontia rufa）过去经历了重大的气候变化，但它们仍然保持着生理限制，限制了它们在凉爽潮湿气候中的分布。自上一次冰川期以来气温的升高可能对缩小它们的范围有很大影响。该物种现在作为 5 个遗传上不同的分支存在，但目前尚不清楚与地形等其他因素相比，气候差异在多大程度上推动了遗传隔离。我们比较了山狸 5 个分支的物种分布模型 （SDM），以了解该物种是否倾向于生态位保守主义或适应当地气候。来自全球生物多样性信息设施的存在点被划分为多个分支，并与BioClim的气候层相结合，为每个分支开发SDM。然后将生态位重叠与所有分支配对之间的遗传相关性进行比较。高温是所有分支分布的限制因素，尽管在大尺度上生态位重叠水平较低，但山海狸似乎表现出一定程度的生态位保守性。这些景观水平SDM表明，一些分支确实存在于比其他山狸更温暖的气候中;然而，Point Arena亚种的精细模型表明，它们通过选择该范围内最凉爽的地方来坚持下去。这表明进化枝之间的生态位重叠可能高于在较粗尺度上检测到的生态位重叠。需要进一步的研究来了解限制这些亚种分布的机制。

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