Large wood (LW) is an indispensable element in riverine ecosystems, especially in lower river parts. The presence of LW significantly shapes local hydraulics, morphology, the nutrient budget; promotes overall river dynamics; and additionally presents a unique habitat for numerous benthic invertebrate species. Therefore, LW is recognized as valuable asset for river restoration measures. Experiences from previous projects show that ecological responses on LW implementation measures vary greatly. That complicates comparisons and estimations on the success of planned measures. Methodological inconsistencies and thus reduced transferability of the results is one major issue. Additionally, wood quality aspects are suspected to be important factors affecting benthic invertebrate colonization patterns. The focus of this study is therefore to consistently assess the ecological significance of installed LW and concrete samples of similar size and shape in terms of benthic invertebrate colonization and to further test, if the condition of wood affects the benthic invertebrate colonization. Our results show that (1) installed LW serves as an abundantly and heterogeneously colonized habitat, (2) the state of decay of LW pieces significantly affects benthic invertebrate colonization in terms of density and diversity and (3) even rare or threatened taxa closely associated to LW were abundantly present on the installed logs, emphasizing the suitability of the chosen approach.

中文翻译：

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年龄问题：已安装大型木材上底栖无脊椎动物的基质特定定居模式

大型木材（LW）是河流生态系统中必不可少的元素，尤其是在下游河流地区。LW的存在显着影响了当地的水力，形态，养分收支。促进整体河流动力；并为众多底栖无脊椎动物提供了独特的栖息地。因此，LW被认为是河流修复措施的宝贵资产。先前项目的经验表明，对轻水实施措施的生态反应差异很大。这使得对计划措施的成功进行比较和估计变得复杂。方法学上的不一致以及因此结果的可传递性降低是一个主要问题。另外，木材质量方面被认为是影响底栖无脊椎动物定殖模式的重要因素。因此，本研究的重点是就底栖无脊椎动物定殖而言一致地评估已安装的轻木和大小和形状相似的混凝土样品的生态学意义，并进一步测试木材的状况是否影响底栖无脊椎动物定殖。我们的结果表明，（1）安装的LW可作为丰富多样的定居栖息地，（2）LW碎片的腐烂状态在密度和多样性方面显着影响底栖无脊椎动物定居，（3）甚至稀有或濒临灭绝的分类单元在已安装的日志中大量存在“ LW”到“ LW”，强调了所选方法的适用性。如果木材状况影响底栖无脊椎动物定殖。我们的结果表明，（1）安装的LW可作为丰富多样的定居栖息地，（2）LW碎片的腐烂状态在密度和多样性方面显着影响底栖无脊椎动物的定居，并且（3）甚至稀有或濒临灭绝的分类单元在已安装的日志中大量存在“ LW”到“ LW”，强调了所选方法的适用性。如果木材状况影响底栖无脊椎动物定殖。我们的结果表明，（1）安装的LW可作为丰富多样的定居栖息地，（2）LW碎片的腐烂状态在密度和多样性方面显着影响底栖无脊椎动物定居，（3）甚至稀有或濒临灭绝的分类单元在已安装的日志中大量存在“ LW”到“ LW”，强调了所选方法的适用性。