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Effects of habitat structural complexity on diversity patterns of neotropical fish assemblages in the Bita River Basin, Colombia

机译：栖息地结构复杂性对哥伦比亚Bita River盆地探矿探矿鱼群多样性模式的影响

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摘要

Several studies have shown that fish assemblages are structured by habitat features, most of them have proposed that there is a positive relationship between habitat structural complexity and species diversity. In this study, we aimed to test this positive-relationship idea in three habitats types (creeks, oxbow lakes and river sandbanks) distributed along the Bita River Basin in South America. Standardized surveys were conducted during January and February of 2016 (low water period) in 30 sites distributed along the entire basin. We recorded 23,092 individuals representing 191 species. To investigate possible relationships between habitat structural complexity and species diversity, we calculated the first three Hill's numbers, and performed a Non-metric Multidimensional Scaling (NMDS), a Principal Component Analysis (PCA) and a Canonical Correspondence Analysis (CCA). Our results showed that river sandbanks and creeks had the highest species richness. Results from the NMDS analysis (stress = 0.19) showed that fish community composition was different in the assessed habitats (ANOSIM < p = 0.001). According to the results of the principal component analysis, sand percentage, dissolved oxygen, and vegetation width separated river sandbanks from the other habitats. Results from the Hill's numbers, forward selection procedure, and canonical correspondence analysis suggested that species composition and diversity were significantly influenced by the habitat structural complexity index and conductivity.
机译：几项研究表明，鱼机组合由栖息地特征构成，大多数都提出了栖息地结构复杂性和物种多样性之间存在正相关关系。在这项研究中，我们旨在在沿南美洲的比特河流域分发的三种栖息地类型（小溪，牛排和河流沙手）中测试这种积极关系的想法。 2016年1月和2月（低水期）在沿整个盆地分布的30个地点进行了标准化调查。我们录制了23,092个代表191种的个人。为了调查栖息地结构复杂性和物种多样性之间的可能关系，我们计算了前三个山峰的数字，并进行了非公制多维缩放（NMDS），主要成分分析（PCA）和规范对应分析（CCA）。我们的研究结果表明，河岸和小溪的物种最丰富。 NMDS分析的结果（应力= 0.19）显示，评估栖息地的鱼群组成不同（Anosim = 0.001）。根据主要成分分析的结果，砂百分比，溶解氧和植被宽度与其他栖息地的河砂袋。山坡的数量，正向选择程序和规范对应分析结果表明，物种组成和多样性受到栖息地结构复杂性指数和电导率的显着影响。

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