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首页> 外文期刊>Ocean & coastal management >Fish assemblages in tropical estuaries of northeast Brazil: A multi component diversity approach
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Fish assemblages in tropical estuaries of northeast Brazil: A multi component diversity approach

机译：巴西东北部热带河口的鱼类组合：多组分多样性方法

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Biodiversity in estuarine ecosystems suffers from the impact of environmental changes and human activities. This mainly involves changes in temperature, salinity, pollution, habitat degradation or loss and fishing activities. The diversity of species communities is traditionally assessed on the basis of their species richness and composition. However, there is growing interest in taking into account complementary components dealing with species differences (e.g. taxonomic relatedness). In spite of their social, ecological and economic importance, the diversity of tropical estuarine fish assemblages has rarely been monitored by means of a multi-component approach under different human pressure and environmental conditions. We analysed the diversity of exploited fish communities (both target and non target species) sampled during scientific surveys within four estuarine complexes in the state of Pernambuco, Brazil: Itapissuma, Suape, Sirinhaem, and Rio Formoso. A total of 122 species were collected within 34 samples. Overall, diversity indices and species models fitting dominance-evenness profiles mainly revealed differences between assemblages from Itapissuma, being the largest estuary with wide areas of mangrove, and the other estuaries. While assemblages from Itapissuma generally encompassed more species and individuals than the other estuaries, species were more closely related from a taxonomic point of view. In addition, a Double Principal Coordinate Analysis (DPCoA) established a typology of assemblages, useful for management purposes, and linked to particular fish families: it highlighted differences between Itapissuma, Suape, Sirinhaem and Rio Formoso. This method combines matrices of species abundances and differences (here taxonomic distances according to the Linnean classification). It was particularly accurate with a first factorial plane explaining 73% of the total inertia, while only 17% was achieved by a traditional Principal Component Analysis (PCA). Overall, this study provides an assessment of the state of fish assemblage diversity in Pernambuco estuaries where contrasted human and environmental conditions occur. It underscores the accuracy of using a multi-component diversity approach, with a multivariate analysis that is not yet widely used, for monitoring the diversity of estuaries for ecosystem-based fisheries management purposes. (C) 2016 Elsevier Ltd. All rights reserved.
机译：河口生态系统中的生物多样性受到环境变化和人类活动的影响。这主要涉及温度，盐度，污染，栖息地退化或丧失以及捕鱼活动的变化。传统上，物种群落的多样性是根据物种的丰富程度和组成来评估的。但是，越来越多的兴趣考虑到处理物种差异（例如生物分类相关性）的互补成分。尽管有其社会，生态和经济重要性，但在不同的人类压力和环境条件下，很少通过多组分方法监测热带河口鱼类组合的多样性。我们分析了在巴西伯南布哥州的四个河口综合体中进行的科学调查中采样的被开发鱼类群落（目标和非目标物种）的多样性：Itapissuma，Suape，Sirinhaem和Rio Formoso。在34个样本中总共收集了122种。总体而言，适应优势度-均匀度分布的多样性指数和物种模型主要揭示了来自Itapissuma的组合（这是最大的红树林口和最大的河口）与其他河口之间的差异。虽然来自Itapissuma的组合通常包括比其他河口更多的物种和个体，但从分类学的角度来看，物种之间的联系更为紧密。此外，双重主坐标分析（DPCoA）建立了组合的类型，可用于管理目的，并与特定的鱼类科目相关：它突出了Itapissuma，Suape，Sirinhaem和Rio Formoso之间的差异。这种方法结合了物种丰度和差异矩阵（此处是根据Linnean分类的分类距离）。它在第一个阶乘平面解释了总惯性的73％时特别准确，而传统的主成分分析（PCA）仅实现了17％。总的来说，这项研究评估了伯南布哥河河口鱼类种群多样性的状况，那里人类和环境条件发生了差异。它强调了使用多成分多样性方法和尚未广泛使用的多变量分析来监测河口多样性以基于生态系统的渔业管理目的的准确性。 （C）2016 Elsevier Ltd.保留所有权利。

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