Suitable habitats for 0-group fish in rehabilitated floodplains along the lower River Rhine
Suitable habitats for 0-group fish in rehabilitated floodplains along the lower River Rhine
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DOI：
10.1002/rra.711
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发表时间：
2003-07-01
影响因子：
2.2
通讯作者：
Backx, JJGM
中科院分区：
文献类型：
--
作者：
Grift, RE;Buijse, AD;Backx, JJGM
通过调查三条新形成的次级河道、一个下游重新连接的牛弓湖和几个现有的丁坝水域之间和内部的0类鱼的空间分布，评估了莱茵河下游恢复的泛滥平原是否适合嗜血鲤科鱼类。在1997年4月至1999年9月期间，用围网和拖网对鱼类进行了抽样，并对每个样本的生境(物理环境)进行了描述(流量、深度、底物和淹没的陆地植被)。与丁坝水域相比，新水体为0级鱼类提供了更合适的栖息地。然而，它们的有益价值在不同的生殖协会之间是不同的，并取决于形态和水文条件。总鱼密度沿水流递减的梯度增加，而嗜血性物种(羽毛虫、戈比奥戈比奥、银鱼和阿斯匹斯)的比例则下降。流速和水深是决定栖息地利用的最重要因素。嗜流性鱼类在空间上与广泛性鱼类(如：阿布拉玛、鲁蒂鲁和大刺鱼)相分离。在洪水期间，被淹没的陆地植被是所有物种幼虫的重要栖息地。为了加强河岸鱼类群落，泛滥平原水体应具有复杂的海岸线和高变异性的流速。它们的坡度应该适中，以最大限度地增加春季和夏季陆地植被被淹没的可能性。今后对类似泛滥平原的管理应侧重于更多样化和更容易获得的水生生境，以增加鱼类物种的总体多样性，因为不同类型的水体显然具有互补的价值。版权所有(C)2003 John Wiley Sons，Ltd.
The suitability of rehabilitated floodplains along the lower River Rhine for rheophilic cyprinids was assessed by investigating the spatial distribution of 0-group fish among, and within, three newly created secondary channels, an oxbow lake reconnected at its downstream end and several existing groyne fields. Fish were sampled during April through September 1997-1999 with seine nets and trawls and, for each sample, the habitat (physical environment) was characterized (flow, depth, substrate and inundated terrestrial vegetation). The new water bodies provide more suitable habitats for 0-group fish than the groyne fields. Their beneficial value differs, however, between reproductive guilds and depends on the morphological and hydrological conditions. Total fish density increased along a gradient of decreasing water flow whereas the proportion of rheophilic species (Barbus barbus, Gobio gobio, Leuciscus idus and Aspius aspius) decreased. Flow velocity and water depth were the most important factors determining habitat utilization. Rheophilic fish were spatially separated from eurytopic fish (e.g. Abramis brama, Rutilus rutilus and Stizostedion lucioperca). During flood events, inundated terrestrial vegetation was an important habitat for the larvae of all species. To enhance the riverine fish community, floodplain water bodies should have complex shorelines, and a high variability of flow velocities. Their slopes should be moderate to maximize the probability of terrestrial vegetation getting inundated during spring and summer. Future management of similar floodplains should focus on more diverse and accessible aquatic habitats to increase overall fish species diversity, since different types of water body clearly have complementary values. Copyright (C) 2003 John Wiley Sons, Ltd.