Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, Gregor-Mendel Straße 33, 1180 Vienna, Austria.
Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, Gregor-Mendel Straße 33, 1180 Vienna, Austria.
Sci Total Environ. 2018 Mar;616-617:17-28. doi: 10.1016/j.scitotenv.2017.10.283. Epub 2017 Nov 9.
This work addresses multiple human stressors and their impacts on fish assemblages of the Drava and Mura rivers in southern Austria. The impacts of single and multiple human stressors on riverine fish assemblages in these basins were disentangled, based on an extensive dataset. Stressor configuration, i.e. various metrics of multiple stressors belonging to stressor groups hydrology, morphology, connectivity and water quality were investigated for the first time at river basin scale in Austria. As biological response variables, the Fish Index Austria (FIA) and its related single as well as the WFD biological- and total state were investigated. Stressor-response analysis shows divergent results, but a general trend of decreasing ecological integrity with increasing number of stressors and maximum stressor is observed. Fish metrics based on age structure, fish region index and biological status responded best to single stressors and/or their combinations. The knowledge gained in this work provides a basis for advanced investigations in Alpine river basins and beyond, supports WFD implementation and helps prioritizing further actions towards multi-stressor restoration- and management.
本研究探讨了多种人为压力源及其对奥地利南部德拉瓦河和穆拉河鱼类群落的影响。本研究基于大量数据集，厘清了单一和多种人为压力源对这些流域河流鱼类群落的影响。首次在奥地利流域尺度上研究了压力源组合，即属于水文、形态、连通性和水质压力源组的多种压力源的各种指标。作为生物响应变量，研究了鱼类奥地利指数（FIA）及其相关的单一以及 WFD 生物和综合状态。压力-响应分析显示出不同的结果，但观察到随着压力源数量和最大压力源的增加，生态完整性呈下降趋势。基于年龄结构、鱼类区域指数和生物状况的鱼类指标对单一压力源及其组合的响应最好。本研究获得的知识为阿尔卑斯河流域及其他地区的进一步研究提供了基础，支持 WFD 的实施，并有助于确定针对多压力源恢复和管理的进一步行动的优先次序。
