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>Long-term large-scale decline in relative abundances of butterfly and burnet moth species across south-western Germany
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Long-term large-scale decline in relative abundances of butterfly and burnet moth species across south-western Germany
Current studies have shown a severe general decline in insect species diversity, their abundance, and a biomass reduction of flying insects. Most of previous studies have been performed at single sites, or were spatially restricted at the landscape level. In this study, we analyse trends of species richness and shifts in species composition of butterflies and burnet moth species across the federal state of Baden-Württemberg in south-western Germany, covering an area of 35,750 km2. The data set consists of 233,474 records and covers a period from 1750 until today. We grouped species according to their species´ specific functional traits and analyse how species with different habitat requirements and behaviour respond to land-use changes over time. Our data document a significant loss of relative abundance for most species, especially since the 1950s until today. Species demanding specific habitat requirements are more seriously suffering under this trend than generalists. This in particular affects taxa adapted to extensively used xerothermic grasslands, bogs or other habitats maintained by traditional low-productivity agricultural practices of the past. Our data indicate large-scale decline in relative abundance of many butterfly and burnet moth species, which happened in particular during the past few decades.
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机译:当前的研究表明,昆虫物种多样性,其丰富度以及飞虫的生物量减少严重地普遍下降。以前的大多数研究都是在单个地点进行的,或者在景观水平上受到空间限制。在这项研究中,我们分析了德国西南部巴登-符腾堡州的联邦州,其面积为35,750 km 2 sup>。该数据集包含233,474条记录,涵盖了从1750年到今天的一段时间。我们根据物种的特定功能特征将其分组,并分析具有不同栖息地要求和行为的物种如何随时间变化响应土地利用变化。我们的数据记录了大多数物种相对丰度的显着下降,尤其是自1950年代至今。在这种趋势下,需要特殊栖息地的物种比通才更严重。这尤其会影响分类单元,这些分类单元适合于过去使用过的传统低生产力农业实践所维持的广泛使用的干热草原,沼泽或其他栖息地。我们的数据表明,许多蝴蝶和burn蛾的相对丰度都在大规模下降,尤其是在过去的几十年中。
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