University of Novi Sad, Faculty of Sciences, Department of Biology and Ecology, Trg Dositeja Obradovića 2, 21000 Novi Sad, Serbia.
University of Novi Sad, Faculty of Sciences, Department of Biology and Ecology, Trg Dositeja Obradovića 2, 21000 Novi Sad, Serbia.
Sci Total Environ. 2018 Sep 1;634:780-790. doi: 10.1016/j.scitotenv.2018.03.367. Epub 2018 Apr 10.
We hypothesize that the physical features of river habitats and anthropogenic hydromorphological alterations influence macrophyte communities and lead to habitat fragmentation. Sampling included 1081 contiguous survey units positioned in the main channel and side arms along 588km of the Danube River, along its middle course. To identify habitat fragments, Multivariate Regression Tree analysis (MRT) was applied on macrophyte and environmental data. Indicator species analyses were combined with MRT. To identify habitat fragments on a scale larger than final MRT groups, we set thresholds for an MRT complexity parameter. We identified 20 fine, 7 medium, and 3 large scale habitat fragments. Damming was the main fragmentation agent. Macrophyte communities show continuous variation at all scales of habitat fragmentation. High species diversity indicates major anthropogenic alteration of the river's hydrology and decline of the natural riparian zone. Future studies of the macrophyte communities, and their habitat fragmentation must include more factors (e.g. nutrient status, physicochemical quality of the water, etc.), as well as assessment of the importance of tributaries.
我们假设河流生境的物理特征和人为的水力学形态改变会影响水生植物群落，并导致生境破碎化。采样包括在多瑙河中游的 588 公里长的主河道和支流的 1081 个连续调查单元。为了识别生境片段，我们将多元回归树分析（MRT）应用于水生植物和环境数据。指示物种分析与 MRT 相结合。为了在大于最终 MRT 组的尺度上识别生境片段，我们为 MRT 复杂度参数设置了阈值。我们确定了 20 个小尺度、7 个中尺度和 3 个大尺度的生境片段。筑坝是主要的破碎化因素。水生植物群落的物种多样性在所有生境破碎化尺度上都表现出连续的变化。高物种多样性表明河流的水文学和自然河岸带发生了重大人为改变。未来对水生植物群落及其生境破碎化的研究必须包括更多因素（如营养状况、水质的理化质量等），以及对支流重要性的评估。
