Environmental filtering is the main assembly rule of ground beetles in the forest and its edge but not in the adjacent grassland
Environmental filtering is the main assembly rule of ground beetles in the forest and its edge but not in the adjacent grassland
复制标题
环境过滤是地甲虫在森林及其边缘的主要聚集规则，但在邻近的草原上则不然
作者：
T. Magura;G. Lövei
在破碎的景观中，相邻栖息地之间的过渡区是常见的，我们对这些栖息地的社区组织力量的理解很重要。边缘研究有很多，但大多数都利用物种丰富度和丰度的信息。然而，物种多样性和分类学多样性对共存物种的功能和繁殖提供的信息很少。结合其功能和系统发育关系的评价，我们的目的是评估是否地面甲虫组合是确定性或随机结构沿着草地-森林梯度。我们的研究结果表明，不同的社区组装规则对森林边缘的两侧。在草原上，共现物种在功能和遗传上与随机零模型没有区别，表明了一个随机组装过程。与此相反，在森林边缘和内部，共存物种表现出功能和系统发育聚类，因此环境过滤可能是构建步甲组合的过程。草原中的群落组装受到森林边缘不对称物种流动（溢出）的影响：更多的森林物种进入草原，而不是开放栖息地和通才物种进入森林。这种不对称的物种流动强调了森林边缘过滤功能的重要性。由于不利的，人为引起的变化，森林边缘的结构，组成和特征可能会改变其过滤功能，边缘必须在保护管理中特别考虑。
In a fragmented landscape, transitional zones between neighboring habitats are common, and our understanding of community organizational forces across such habitats is important. Edge studies are numerous, but the majority of them utilize information on species richness and abundance. Abundance and taxonomic diversity, however, provide little information on the functioning and phylogeny of the co‐existing species. Combining the evaluation of their functional and phylogenetic relationships, we aimed to assess whether ground beetle assemblages are deterministically or stochastically structured along grassland–forest gradients. Our results showed different community assembly rules on opposite sides of the forest edge. In the grassland, co‐occurring species were functionally and phylogenetically not different from the random null model, indicating a random assembly process. Contrary to this, at the forest edge and the interior, co‐occurring species showed functional and phylogenetic clustering, thus environmental filtering was the likely process structuring carabid assemblages. Community assembly in the grassland was considerably affected by asymmetrical species flows (spillover) across the forest edge: more forest species penetrated into the grassland than open‐habitat and generalist species entered into the forest. This asymmetrical species flow underlines the importance of the filter function of forest edges. As unfavorable, human‐induced changes to the structure, composition and characteristics of forest edges may alter their filter function, edges have to be specifically considered during conservation management.