Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, the Netherlands.
Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, the Netherlands.
Sci Total Environ. 2020 Feb 10;703:135060. doi: 10.1016/j.scitotenv.2019.135060. Epub 2019 Nov 5.
The input of land use specific organic matter into lowland streams may impact sediment characteristics in terms of food resources and habitat structure, resulting in differences in macroinvertebrate community composition. Therefore, we investigated to what extent land use specific sediment food and habitat characteristics structure macroinvertebrate communities. To this purpose linear multiple regression models were constructed, in which macroinvertebrate biotic indices were considered as response variables and sediment characteristics as predictor variables, analysed in 20 stream stretches running through five different land use types. Sediment characteristics and macroinvertebrate community composition were land use specific. The carbon/nitrogen (C/N) ratio, woody debris substrate cover and the origin of fatty acids influenced macroinvertebrate community composition. Shannon-Wiener diversity was better explained by fatty acids origin, such as in grassland streams, where a higher relative content of plant derived fatty acids related to a higher macroinvertebrate diversity. In cropland and wastewater treatment plant (WWTP) streams with a low C/N ratio and dominated by microbial derived fatty acids, higher abundances of Oligochaeta and Chironomus sp. were observed. Ephemeroptera, Plecoptera, and Trichoptera (EPT) richness was positively related to woody debris substrate cover, which only occurred in forest streams. Hence, macroinvertebrate community composition was influenced by the origin of the organic material, being either allochthonous or autochthonous and when autochthonous being either autotrophic or heterotrophic. It is therefore concluded that sediment food and habitat characteristics are key ecological filters.
土地利用特定有机物输入到低地溪流中可能会影响沉积物特性，从而影响食物资源和栖息地结构，进而导致大型无脊椎动物群落组成的差异。因此，我们研究了土地利用特定的沉积物食物和栖息地特征在多大程度上构建了大型无脊椎动物群落。为此，我们构建了线性多元回归模型，其中将生物指数作为响应变量，将沉积物特征作为预测变量，在穿过 5 种不同土地利用类型的 20 个溪流段中进行分析。沉积物特征和大型无脊椎动物群落组成具有土地利用特异性。碳氮比（C/N）、木质碎屑基质覆盖率和脂肪酸来源影响大型无脊椎动物群落组成。香农-威纳多样性指数更好地解释了脂肪酸的起源，例如在草地溪流中，植物衍生脂肪酸的相对含量较高，与较高的大型无脊椎动物多样性相关。在农田和污水处理厂（WWTP）溪流中，C/N 比较低，以微生物衍生脂肪酸为主，寡毛类和摇蚊科的丰度较高。蜉蝣目、石蝇目和毛翅目（EPT）丰富度与木质碎屑基质覆盖率呈正相关，这仅发生在森林溪流中。因此，大型无脊椎动物群落组成受到有机物质来源的影响，即异养或自养，当自养时，是自养或异养。因此，可以得出结论，沉积物的食物和栖息地特征是关键的生态过滤器。
