从亚马逊河流量减少河段的海滩了解鱼类贝塔多样性的驱动因素

IF 1.4 4区 环境科学与生态学 Q3 ECOLOGY
Antonio Augusto Jardim Jr, Jean Carlo Gonçalves Ortega, Ronaldo Souza da Silva, Danielly Torres Hashiguti, Luciano Fogaça de Assis Montag
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引用次数: 0

摘要

在这项研究中,我们旨在确定贝洛蒙特大坝影响下的新古大峡谷(Volta Grande do Xingu)河段海滩上鱼类组合的贝塔多样性模式的驱动因素。在 2021 年的枯水期,使用拖网在 28 个沙滩上收集了鱼类(每个沙滩在此期间取样一次)。环境变量的测量在现场进行,而空间变量则通过非对称特征向量图(AEM)获得。我们使用布雷-柯蒂斯(Bray-Curtis)相似性指数计算了贝塔多样性,并对相似性矩阵进行了基于距离的冗余分析(db-RDA),以评估贝塔多样性与环境和空间变量之间的关系。此外,我们还进行了方差分区,以量化解释矩阵对响应矩阵的纯贡献和共享贡献。结果显示,采样海滩的贝塔多样性较低,而空间变量和 pH 值在一定程度上解释了贝塔多样性。我们的研究结果强调了空间结构对当地群落组合的影响,表明在水电站减少流量的影响下,分散过程和空间连通性是导致海滩鱼类群落贝塔多样性的相关机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Understanding the drivers of fish beta diversity from beaches on a reduced flow stretch in an Amazonian River

Understanding the drivers of fish beta diversity from beaches on a reduced flow stretch in an Amazonian River

In this study, we aimed to identify the factors that drive the patterns in beta diversity of fish assemblages on the beaches of the Volta Grande do Xingu, a river stretch under the influence of Belo Monte dam. Fishes were collected using a trawl net in 28 sandy beaches during the low water period of 2021 (each beach was sampled once during this period). Measurements of environmental variables were carried out on-site, while spatial variables were obtained using Asymmetric Eigenvector Maps (AEM). Using the Bray–Curtis dissimilarity index, we calculated beta diversity and conducted a distance-based redundancy analysis (db-RDA) with the dissimilarity matrix to assess its relationship between beta diversity and environmental and spatial variables. Additionally, we performed a variance partition to quantify the pure and shared contributions of the explanatory matrices to our response matrix. The results revealed low beta diversity among the sampled beaches, and that this beta diversity was explained in part by the spatial variables and pH. Our findings underscore the influence of spatial structure on the assembly of local communities, indicating that dispersion processes and spatial connectivity are relevant mechanisms that contribute to the beta diversity of beach fish communities under influence of a reduced flow by a Hydropower Plant.

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来源期刊
Environmental Biology of Fishes
Environmental Biology of Fishes 环境科学-海洋与淡水生物学
CiteScore
2.60
自引率
14.30%
发文量
169
审稿时长
3 months
期刊介绍: Environmental Biology of Fishes is an international journal that publishes original studies on the ecology, life history, epigenetics, behavior, physiology, morphology, systematics and evolution of marine and freshwater fishes. Empirical and theoretical papers are published that deal with the relationship between fishes and their external and internal environment, whether natural or unnatural. The journal concentrates on papers that advance the scholarly understanding of life and draw on a variety of disciplines in reaching this understanding. Environmental Biology of Fishes publishes original papers, review papers, brief communications, editorials, book reviews and special issues. Descriptions and submission requirements of these article types can be found in the Instructions for Authors.
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