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首页> 外文期刊>Oecologia >Spillover from adjacent crop and forest habitats shapes carabid beetle assemblages in fragmented semi-natural grasslands
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Spillover from adjacent crop and forest habitats shapes carabid beetle assemblages in fragmented semi-natural grasslands

机译：邻近农作物和森林栖息地的溢出物塑造了零散的半天然草原中甲壳类甲虫的组合。

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Semi-natural grasslands in Europe are insect biodiversity hotspots and important source habitats delivering ecosystem services to adjacent agricultural land by species spillover. However, this spillover might also occur in the opposite direction, affecting the diversity of semi-natural grasslands. This opposite spillover has got little attention in scientific literature even though generalist species penetrating into the grasslands can affect local biotic interactions, community composition and the conservation value of grassland habitats. In this study, we examined spillover effects from two different adjacent habitat types on carabid beetle assemblages in 20 semi-natural calcareous grasslands. The grasslands were either adjacent to a cereal crop field or to a coniferous forest. We found distinct differences in carabid beetle assemblages in calcareous grasslands depending on adjacent habitat type. Species richness and activity density were higher, but the evenness was lower in calcareous grasslands adjacent to crop fields compared with calcareous grasslands adjacent to coniferous forests. Further, we found a strong spillover of carabid beetles from adjacent crop fields after crop harvest, which may result in transiently increased predation pressure and resource competition in calcareous grasslands. Our results highlight that species composition, diversity and presumably ecosystem functions within semi-natural habitats are affected by the type and management of surrounding habitats. This needs to be considered by nature conservation measures, which aim to protect the unique insect communities of semi-natural European grasslands.
机译：欧洲的半天然草原是昆虫生物多样性的热点地区，也是重要的生物栖息地，可通过物种外溢向邻近的农田提供生态系统服务。但是，这种溢出也可能发生在相反的方向，从而影响了半天然草原的多样性。尽管渗透到草地上的通才物种可能影响当地的生物相互作用，群落组成和草地生境的保护价值，但这种相反的溢出在科学文献中却很少受到关注。在这项研究中，我们研究了两种不同的相邻生境类型对20个半天然钙质草原的甲虫组合的溢出效应。草原与谷物作物田或针叶林相邻。我们发现钙质草地上的甲虫组合有明显的不同，具体取决于邻近的生境类型。与邻近针叶林的钙质草地相比，毗邻农田的钙质草地的物种丰富度和活动密度较高，但均匀度较低。此外，我们发现农作物收获后，甲虫从相邻作物田中大量溢出，这可能会导致钙质草原的捕食压力瞬时增加和资源竞争。我们的结果表明，半自然生境中的物种组成，多样性和生态系统功能受周围生境的类型和管理方式的影响。需要通过自然保护措施来考虑这一点，自然保护措施旨在保护欧洲半天然草原的独特昆虫群落。

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