Abstract

Although it is well known that the increasing size of the human population has a negative effect on freshwater biodiversity, the subject of whether or how the intersection of roads and streams (hereafter road crossings) influence the diversity of stream macro-invertebrates is under-researched. To fill this gap in our knowledge, we collected stream macro-invertebrates from road crossings (bridges and culverts) and compared their diversity with upstream and downstream sections. We found that road crossings had negative effects on the richness and abundance of native macro-invertebrates, as well as on the number of protected taxa. Our results showed also that alien individuals were more abundant at road crossings. These findings support the assumption that road crossings contribute to the spread of alien species. The assessment of environmental variables indicated that road crossings caused habitat modifications, and based on these it can be assumed that habitat modifications and associated phenomena (e.g. pollutants and storm events) were the major drivers of the observed patterns in biodiversity. Our results fill a knowledge gap and contribute to the deeper understanding of the effect of road crossings on freshwater biodiversity.

中文翻译：

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道路交叉口对河流大型无脊椎动物多样性的影响

摘要

尽管众所周知，人口数量的增加对淡水生物多样性有负面影响，但是关于道路与溪流的交汇处（以下简称过路处）是否影响或如何影响溪流无脊椎动物多样性的问题尚待研究。 。为了填补我们的知识空白，我们从道路交叉口（桥梁和涵洞）收集了大型无脊椎动物，并将它们的多样性与上游和下游部分进行了比较。我们发现，人行横道对本地大型无脊椎动物的丰富和丰满以及受保护的分类单元的数量具有负面影响。我们的结果还表明，外来人在道路交叉口处更为丰富。这些发现支持这样的假设，即过马路会促进外来物种的扩散。对环境变量的评估表明，人行横道引起了生境的改变，并据此可以假设生境的改变和相关现象（例如，污染物和暴风雨事件）是所观察到的生物多样性模式的主要驱动力。我们的结果填补了知识空白，并有助于加深对道路交叉口对淡水生物多样性影响的了解。