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首页> 外文期刊>Freshwater science >Nestedness patterns and dispersal dynamics in tropical central Indian stream fish metacommunities
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Nestedness patterns and dispersal dynamics in tropical central Indian stream fish metacommunities

机译：热带中部印度溪流畜牧业的嵌套模式和分散动力学

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Dispersal processes, such as immigration and extinction rates, and habitat properties play a crucial role in determining species composition and nestedness patterns within communities. In the current global scenario of changing environmental conditions and habitat fragmentation, information on the role of natural dispersal mechanisms and disturbance factors are especially important for understanding dynamics of species composition changes in stream ecosystems. We investigated spatial and temporal patterns of nestedness of fish communities in tropical stream systems of central India and the relationship of various dispersal factors (immigration–extinction rates and their variability) with habitat properties (habitat size and heterogeneity) and anthropogenic disturbances. We tested predictions of the classical model by Schlosser on immigration–extinction dynamics along longitudinal gradients in stream community composition for these streams. The results revealed significant patterns of nestedness for all study sites. Sites exposed to varying degrees of disturbance (induced by human activities) showed lower nestedness than undisturbed ones. Immigration rates did not show strong relations with nestedness but extinction rates were significantly related (negatively) to nestedness. In addition, disturbance played an important role in determining immigration rates and variability in immigration rates. Stream characteristics, such as habitat-size and habitat-variability gradients, were not statistically significant predictors of immigration and extinction rates. Our results demonstrate the influence of local anthropogenic disturbances on dispersal dynamics of species. A reduction in availability of suitable habitats could lower immigrations.
机译：诸如移民和消除率的分散过程，栖息地属性在确定社区内的物种组成和嵌套模式方面发挥至关重要的作用。在目前改变环境条件和栖息地碎片的全球情景中，有关自然分散机制和扰动因素的作用的信息对于了解物种组成变化的流动体系的变化尤为重要。我们调查了印度中部热带流系统中鱼群嵌套的空间和时间模式，以及各种分散因素（移民 - 消除率及其变异性）与栖息地性能（栖息地大小和异质性）和人为干扰的关系。我们测试了Schlosser对纵向渐变动态的古典模型的预测，这些流的流社区组合物中的纵向梯度。结果显示了所有研究网站的嵌套嵌套的显着模式。暴露于不同程度的干扰（人类活动诱导）的遗址显示出低于未受干扰的腹部较低的嵌套。移民率没有表现出与嵌套的强大关系，但灭绝率与嵌套有关（负面）的显着相关。此外，干扰在确定移民率和移民率方面的可变性方面发挥了重要作用。流特征，如栖息地和栖息地 - 可变性梯度，没有统计学意义的移民和灭绝率的预测因子。我们的结果表明局部人为紊乱对物种分散动力学的影响。合适栖息地的可用性减少可能降低移民。

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