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首页> 外文期刊>Trends in Ecology & Evolution >The effect of hedgerow density on habitat quality distorts species-area relationships and the analysis of extinction debts in hedgerows
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The effect of hedgerow density on habitat quality distorts species-area relationships and the analysis of extinction debts in hedgerows

机译：HEDGEROW密度对栖息地质量的影响扭曲了物种面积关系及分析HEDGEROWS

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Context Hedgerows are highly important for maintaining the biodiversity in deforested landscapes. Especially for habitat specialists such as several forest plants they can provide important refuge habitats. Objectives This study aims to examine whether there is an extinction debt for forest plants in hedgerows. Methods In a study area in Northern Germany that had lost 47% of the hedgerow network over the past 120 years, hedgerows were mapped for the presence of forest vascular plants. In a multi-model approach, we compared the explanatory power of present and historical landscape variables and habitat quality on diversity patterns. Results The change in landscape configuration had no effect on the species richness of forest plants in hedgerows, i.e. there was no sign of an extinction debt. The best explanatory variable was the hedgerow width with more species found in wider hedgerows. This demonstrates the importance of including local habitat variables in the study of extinction debt. For ancient woodland indicator species models including both the landscape configuration and habitat variables were superior to simple models. The best models included the historical distance to the nearest forest, suggesting an extinction debt. Counterintuitively, a high density of hedgerows had a negative influence on species richness, most likely because hedgerows are narrower in areas with higher densities due to land-saving measures by farmers. There was also a negative correlation between hedgerow density and the hedgerow proximity to forests. Conclusions The effects of important covariates may obscure species-area relationships and undermine extinction debt analyses.
机译：背景下，Hedgerows对于维持森林景观中的生物多样性非常重要。特别是对于栖息地专家，如几种森林植物，他们可以提供重要的避难所。目的这项研究旨在审查HEDGEROWS的森林植物是否存在灭绝债务。方法在德国北部的研究区域，在过去120年中失去了47％的HEDGEROW网络，患有森林血管植物的存在映射了Hedgerows。在多模型方法中，我们比较了当前和历史景观变量和栖息地质量的分化模式的解释力。结果景观配置的变化对HEDGEROWS森林植物的种类丰富，即，灭绝债务没有迹象。最好的解释性变量是Hedgerow宽度，更广泛的Hedgerows中发现了更多种。这证明了在灭绝债务研究中包括当地栖息地变量的重要性。对于古代林地指示器物种模型，包括景观配置和栖息地变量的型号优于简单的型号。最好的模型包括到最近森林的历史距离，表明灭亡债务。违反思考，高密度的Hedgerows对物种丰富性产生负面影响，最有可能因为由于农民的征收措施而具有更高密度的地区，因此在具有更高密度的地区较窄。 HEDGEROW密度与森林的HEDGEROW接近之间也存在负相关性。结论重要协变量的影响可能会掩盖物种区域关系和破坏灭绝债务分析。

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