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首页> 外文期刊>Aquatic Sciences >α and β diversity of fishes in relation to a gradient of habitat structural complexity supports the role of environmental filtering in community assembly
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α and β diversity of fishes in relation to a gradient of habitat structural complexity supports the role of environmental filtering in community assembly

机译：与栖息地结构复杂性的梯度相关的鱼类的α和β多样性支持环境过滤在社区组装中的作用

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alpha-diversity often responds to habitat structural complexity as a unimodal function. In aquatic systems, increasing density of aquatic vegetation creates more habitat structural complexity for fishes, but only up to a certain threshold, beyond which fish abundance and diversity are restricted by reduced space. As a result, species turnover and nestedness should be observed over habitat structural complexity gradients, reflecting the sorting of species according to aspects of their environment. We investigated the relationship of fish alpha and beta diversity along gradients of habitat structural complexity created by aquatic vegetation in the floodplain of Upper Parana River. We collected a total of 1832 fishes (24 species) along vegetation density gradients. Our results revealed that alpha diversity peaked at intermediate levels of habitat structural complexity where interstitial spaces were numerous but no so small as to limit occupancy by most fishes. Low alpha diversity was associated with lower habitat structural complexity, as commonly reported, and this may result from the influence of predation mortality or threat where there is less physical structure that provides refuge from predators and interference with predator lines of sight for prey detection. Fish diversity is low in patches with high habitat structural complexity because small interstitial spaces restrict fish size and dissolved oxygen concentration sometimes is low. Aquatic vegetation density in floodplain habitats therefore functions as a strong environmental filter influencing spatial patterns of fish alpha and beta diversity.
机译：α-多样性往往响应栖息地结构复杂性作为单峰功能。在水生体系中，水生植被的升高密度为鱼类创造了更多的栖息地结构复杂性，但只能达到一定的阈值，超出了诸多的鱼类和多样性受到降低空间的限制。结果，应观察到物种营业额和嵌套，以栖息地结构复杂性梯度，反映了根据其环境的方面的物种的分类。我们调查了鱼α和β多样性沿着由上帕拉纳河洪泛区产生的栖息地结构复杂性的习性结构复杂性的关系。我们沿着植被密度梯度共收集了1832条鱼（24种）。我们的研究结果表明，群体多样性在栖息地结构复杂性的中间水平上达到顶峰，间隙空间很多但没有如此之小，以限制大多数鱼类的占用。低α多样性与众所周知的栖息地结构复杂性有关，这可能是由于捕食死亡率或威胁的影响，其中物理结构较少，这些物理结构从捕食者提供避难和与捕食者捕食者捕食者视线的干扰。鱼类多样性在具有高栖息地结构复杂性的斑块中低，因为小型间隙空间限制了鱼尺寸并溶解氧浓度有时是低的。因此，洪泛区栖息地的水生植被密度作为影响鱼α和β多样性的空间模式的强烈环境过滤器。

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