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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：鱼类的α和β多样性与栖息地结构复杂性梯度的关系支持了环境过滤在群落聚集中的作用

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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多样性通常以单峰函数的形式响应栖息地结构的复杂性。在水生系统中，水生植被密度的增加会给鱼类带来更多的栖息地结构复杂性，但只能达到一定的阈值，超过该阈值，鱼类的丰度和多样性就会受到空间减少的限制。因此，应在栖息地结构复杂性梯度上观察物种的更新和嵌套，以反映物种根据其环境方面的分类。我们调查了上巴拉那河上游平原上水生植被造成的鱼类α​​和β多样性与栖息地结构复杂性梯度之间的关系。根据植被密度梯度，我们总共收集了1832条鱼（24种）。我们的结果表明，α多样性在栖息地结构复杂性的中间水平达到顶峰，在该水平上，间隙空间众多，但大小不至于限制大多数鱼类的占有。如普遍报道的那样，低的阿尔法多样性与较低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所致，因为那里的物理结构较少，可以躲避捕食者并干扰捕食者视线以进行猎物检测。在具有高栖息地结构复杂性的斑块中，鱼类的多样性较低，因为小间隙空间限制了鱼类的大小，溶解氧浓度有时较低。因此，漫滩生境中的水生植被密度是影响鱼类α和β多样性空间格局的强大环境过滤器。

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