FAME - Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, P.O. Box 94248, 1090 GE Amsterdam, The Netherlands.
FAME - 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. 2018 Aug 1;631-632:459-468. doi: 10.1016/j.scitotenv.2018.03.010. Epub 2018 Mar 16.
Despite the widely acknowledged connection between terrestrial and aquatic ecosystems, the contribution of runoff to the sediment composition in lowland stream deposition zones and the subsequent effects on benthic invertebrates remain poorly understood. The aim of this study was therefore to investigate the mechanisms by which runoff affects sediment composition and macroinvertebrates in deposition zones of lowland stream ecosystems. To this end, sediment from runoff and adjacent instream deposition zones from streams with different land use was chemically characterized and the biological effects were assessed at the species, community and ecosystem level. Runoff and deposition zone sediment composition as well as biological responses differed clearly between forest and agricultural streams. The stream deposition zone sediment C/N ratio reflected the respective runoff sediment composition. Deposition zones in the forest stream had a higher C/N ratio in comparison to the agricultural streams. Growth of Hyalella azteca and reproduction of Asellus aquaticus were higher on forest stream sediment, whereas chironomids and worms suffered less mortality on the agricultural sediments containing only natural food. The forest stream deposition zones showed higher values for indices indicative of biological integrity and had a lower sediment oxygen demand. We concluded that agricultural land use affects lowland stream ecosystem deposition zones at the species, community and ecosystem level via altered food quality (C/N ratio) and higher oxygen demand of the sediment.
尽管陆地和水生生态系统之间存在广泛公认的联系，但径流入流对低地溪流沉积区沉积物组成的贡献以及对底栖无脊椎动物的后续影响仍知之甚少。因此，本研究旨在调查径流入流如何影响低地溪流生态系统沉积区的沉积物组成和大型无脊椎动物。为此，对具有不同土地利用的溪流的径流入流和相邻的溪流沉积区的沉积物进行了化学特征描述，并在物种、群落和生态系统水平上评估了生物效应。径流入流和沉积区沉积物组成以及生物响应在森林溪流和农业溪流之间明显不同。溪流沉积区沉积物的 C/N 比反映了各自的径流入流沉积物组成。与农业溪流相比，森林溪流的沉积区 C/N 比更高。Hyalella azteca 的生长和 Asellus aquaticus 的繁殖在森林溪流沉积物上更高，而仅含有天然食物的农业沉积物上的摇蚊和蠕虫死亡率较低。森林溪流沉积区的生物完整性指示指数值较高，沉积物的需氧量较低。我们得出结论，农业土地利用通过改变食物质量（C/N 比）和沉积物的需氧量来影响低地溪流生态系统沉积区在物种、群落和生态系统水平上的功能。
