Patterns in the distribution of freshwater fishes in rivers of Central Western Ghats, India and their associations with environmental gradients
Patterns in the distribution of freshwater fishes in rivers of Central Western Ghats, India and their associations with environmental gradients
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DOI：
10.1007/s10750-004-4949-1
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发表时间：
2004-11-01
期刊：
影响因子：
2.6
通讯作者：
Bhat, A
中科院分区：
文献类型：
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作者：
Bhat, A
首次研究了印度高止山脉中部四个水系（Sharavati、Aghanashini、Bedti和Kali）的淡水鱼类群落生态。分析了鱼类物种分布的模式，确定了决定该地区物种丰富度和组成的重要河流和环境参数。利用单变量相关分析研究了物种丰富度和多样性的上下游趋势以及河流特征的变化。初步分析表明，在物种组成和摄食公会的变化存在一个逐渐的物种周转沿着流梯度。有相关的变化，在主要的饲养公会组成，与较高比例的食虫动物和藻类/草食动物的组成在上游转移到杂食动物和食肉动物占主导地位的下游。皮尔逊积差相关分析沿着逐步多元回归分析确定河流深度和海拔高度是决定物种丰富度的重要参数。典范对应分析，研究物种与环境参数的关联。分析表明，CCA轴具有很强的种-环境相关性，CCA轴1以及整个测试具有很高的显著性。CCA轴上的物种和网站分数的情节表现出明显的种族隔离的基础上，它们与环境和流属性的关系。这项研究是我们了解这些河流的鱼类群落结构的重要一步，并将有助于未来的水生群落及其生境的保护工作。
The community ecology of freshwater fishes in four river systems (Sharavati, Aghanashini, Bedti and Kali) of the central Western Ghats ( India) has been studied for the first time. Patterns of fish species distributions were analysed and important stream and environmental parameters determining the species richness and composition of this region were identified. Upstream - downstream trends in species richness and diversity as well as changes in stream characteristics were studied using univariate correlation analyses. Preliminary analyses on changes in species composition and feeding guilds showed the presence of a gradual species turnover along the stream gradient. There were associated changes in the major feeding guild compositions, with a higher proportion of insectivore and algivore/herbivore composition in the upper reaches shifting to a predominance of omnivores and carnivores downstream. Pearson's product - moment correlation analyses along with stepwise multiple regression analyses identified stream depth and altitude as the important parameters determining species richness. Canonical correspondence analysis was performed to study species associations with environmental parameters. The analysis showed a strong species - environmental correlation to the CCA axes, a high significance for the CCA axis 1 as well as for the overall test. The plots of the species and site scores on the CCA axes showed a clear segregation of species based on their relations with environmental and stream properties. This study is an important step in our understanding of the community structure of fish species of these rivers and would be helpful in future efforts on the conservation of aquatic communities and their habitats.