The role of river confluences and meanderings in preserving local hot spots for threatened plant species in riparian ecosystems
The role of river confluences and meanderings in preserving local hot spots for threatened plant species in riparian ecosystems
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DOI：
10.1002/aqc.1194
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发表时间：
2011-06-01
影响因子：
2.4
通讯作者：
Ushimaru, Atushi
中科院分区：
文献类型：
--
作者：
Osawa, Takeshi;Mitsuhashi, Hiromune;Ushimaru, Atushi
1.虽然洪水在河岸生态系统中为植物和动物创造了多样化的栖息地，但它对人类住区造成了滋扰。因此，这些地区经常受到洪水的干扰，更有可能经历强有力的人工控制措施。对这一假设进行了检验，并制定了一种方法，利用河流地图来确定这些地区。利用两个河岸数据源，在两个不同尺度（网格大小）上考察了可能影响洪水频率的两个地形成分（汇流次数和单位面积的蜿蜒程度）对受威胁物种分布和人工改造程度的影响.受威胁的植物种类和人工建筑物的数量随着汇流次数和单位面积的蜿蜒程度的增加而增加。受威胁植物种类的数量与人工建筑物的数量没有相关性.此外，研究结果表明，汇合和曲流提供不同的生境条件的受威胁的植物物种。汇流可能提供更频繁的干扰栖息地，而曲流可能提供相对稳定的栖息地。根据这些结果，通过洪水，汇合和蜿蜒对于创造和维持受威胁物种所使用的多样性栖息地非常重要，但这些栖息地目前也受到人工控制的威胁。我们建议，单位面积汇流密度和河流长度图是一个有用的工具，定位当地的生物多样性热点。查明目前受到威胁的主要生物多样性储存库，可以改进养护和管理规划。版权所有（C）2011约翰威利父子有限公司
1. While flooding creates diverse habitats for plants and animals in riparian ecosystems, it presents a nuisance to human settlement. Thus, such areas that are frequently disturbed by flooding are more likely to experience strong artificial control measures.2. This hypothesis was tested and a method was developed to identify these areas using river maps. The effects of two terrain components that could potentially influence flooding frequency (the number of confluences and the degree of meandering per unit area) on both the distribution of threatened species and the degree of artificial modification were examined at two different scales (grid sizes) using two riparian data sources.3. The numbers of threatened plant species and artificial constructions increased with the number of confluences and the degree of meandering per unit area. The number of threatened plant species was not correlated with the number of artificial constructions.4. In addition, the results suggest that confluences and meanderings provide different habitat conditions for threatened plant species. Confluences may provide more frequently disturbed habitats, whereas meanderings may provide relatively stable habitats.5. Based on these results, through flooding, both confluences and meanderings are important for creating and maintaining the diverse habitats used by threatened species, but these habitats are also currently threatened by artificial controls. We suggest that a per-unit-area confluence density and river length map is a helpful tool for locating local biodiversity hot spots. The identification of major reservoirs of biodiversity that are currently threatened can improve conservation and management planning. Copyright (C) 2011 John Wiley & Sons, Ltd.