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首页> 外文期刊>Oecologia >Exotic trees modify the thermal landscape and food resources for lizard communities
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Exotic trees modify the thermal landscape and food resources for lizard communities

机译：外来树木改变了蜥蜴群落的热景观和食物资源

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Increasing numbers of invasive plant species are establishing around the globe, and these species frequently form dense stands that alter habitat structure in critical ways. Nevertheless, little is known about the mechanisms underlying the impacts of invasive alien plant species on native fauna. We first ask whether alien pine trees impact lizard species richness in the Cape Floristic Region of South Africa, a world-renowned biodiversity hotspot, by examining differences in lizard species richness, abundance, and diversity between native mountain fynbos and exotic pine tree-dominated habitats. We then examine two mutually non-exclusive processes: (i) changes in the thermal quality of the habitat and (ii) changes in the availability of food resources, to explain differences in lizard assemblages among habitat types. Lizard richness, abundance, and diversity were greater in fynbos habitat than in fynbos heavily invaded by pine and in pine plantations. The thermal quality of the environment and food resources was consistently higher in native fynbos than in pine forests, but these responses were more varied when comparisons were made along an invasion gradient and among seasons. Our results suggest that management strategies must consider spatially and temporally detailed measurements of thermal regimes and resources to assess the impacts of invasive vegetation on reptile diversity.
机译：全球范围内正在建立越来越多的入侵植物物种，这些物种经常形成密集的林分，以关键的方式改变栖息地的结构。然而，对于外来入侵植物物种对本地动物的影响所依据的机制知之甚少。首先，我们通过研究本地山地小羚羊和外来松树为主的栖息地之间的蜥蜴物种丰富度，丰度和多样性差异，来询问外来松树是否会影响世界著名的生物多样性热点南非开普植物区的蜥蜴物种丰富度。 。然后，我们研究了两个互不排斥的过程：（i）生境的热质量的变化和（ii）食物资源的可用性的变化，以解释不同生境类型中蜥蜴组合的差异。 Fynbos生境中的蜥蜴丰富度，丰度和多样性要比松树和松树人工林严重侵袭的Fynbos大。天然fynbos的环境和食物资源的热质量始终高于松树林，但是当按照入侵梯度和季节进行比较时，这些响应变化更大。我们的结果表明，管理策略必须考虑热态和资源的时空详细测量，以评估侵入性植被对爬行动物多样性的影响。

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