Coastal freshwater stream fish fauna from a threatened estuarine lagoon complex in northeastern Brazil

IF 1.4 4区环境科学与生态学 Q3 ECOLOGY Environmental Biology of Fishes Pub Date : 2023-12-23 DOI:10.1007/s10641-023-01495-x

{"title":"Coastal freshwater stream fish fauna from a threatened estuarine lagoon complex in northeastern Brazil","authors":"","doi":"10.1007/s10641-023-01495-x","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> Freshwater ecosystems play a vital role in sustaining human populations; however, these environments are increasingly subject to human interference, driven by land use modifications, species introductions, pollution, and habitat loss. We sampled the ichthyofauna and collected environmental variables from 24 coastal streams in northeastern Brazil. Fish composition, abundance, and biomass served as the response variables, while physicochemical data, hydrological attributes, riparian characteristics, and substrate composition were considered as predictor variables. Our main objective was to evaluate the impact of a riparian land use gradient, ranging from conserved to degraded scenarios (i.e., forested, grassy, and urban streams), on the structure of fish assemblages. To achieve this, the graphical relationship of ABC plots and their W values between the three sets of streams was evaluated, and a Hellinger transformation-based Redundancy Analysis (tb-RDA) was conducted and we compared fish composition among the stream categories using a PERMANOVA test. We identified that the W values of forested and urban streams were significantly different, indicating a shift from k to r-strategists; the tb-RDA revealed three stream categories: (i) forested streams and their association with Anablepsoides bahianus and Parotocinclus cf. jumbo, (ii) grassy streams and their association with Poecilia vivipara and Astyanax cf. bimaculatus, and (iii) urban streams and their relationship with Poecilia reticulata and Oreochromis niloticus. We also found important differences between fish composition along the riparian land use gradient, with urban streams showing a significant divergence from grassy and forested streams. We observed a loss of native species and an introduction of exotic species in the evaluated gradient, consistent with the premises of niche theory.","PeriodicalId":11799,"journal":{"name":"Environmental Biology of Fishes","volume":"81 1","pages":""},"PeriodicalIF":1.4000,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Biology of Fishes","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s10641-023-01495-x","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ECOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

Freshwater ecosystems play a vital role in sustaining human populations; however, these environments are increasingly subject to human interference, driven by land use modifications, species introductions, pollution, and habitat loss. We sampled the ichthyofauna and collected environmental variables from 24 coastal streams in northeastern Brazil. Fish composition, abundance, and biomass served as the response variables, while physicochemical data, hydrological attributes, riparian characteristics, and substrate composition were considered as predictor variables. Our main objective was to evaluate the impact of a riparian land use gradient, ranging from conserved to degraded scenarios (i.e., forested, grassy, and urban streams), on the structure of fish assemblages. To achieve this, the graphical relationship of ABC plots and their W values between the three sets of streams was evaluated, and a Hellinger transformation-based Redundancy Analysis (tb-RDA) was conducted and we compared fish composition among the stream categories using a PERMANOVA test. We identified that the W values of forested and urban streams were significantly different, indicating a shift from k to r-strategists; the tb-RDA revealed three stream categories: (i) forested streams and their association with Anablepsoides bahianus and Parotocinclus cf. jumbo, (ii) grassy streams and their association with Poecilia vivipara and Astyanax cf. bimaculatus, and (iii) urban streams and their relationship with Poecilia reticulata and Oreochromis niloticus. We also found important differences between fish composition along the riparian land use gradient, with urban streams showing a significant divergence from grassy and forested streams. We observed a loss of native species and an introduction of exotic species in the evaluated gradient, consistent with the premises of niche theory.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

巴西东北部受威胁河口泻湖群的沿海淡水溪流鱼类动物群

摘要淡水生态系统在维持人类生存方面发挥着至关重要的作用；然而，由于土地使用方式的改变、物种引进、污染和栖息地丧失，这些环境正日益受到人类的干扰。我们在巴西东北部的 24 条沿海溪流中采集了鱼类样本，并收集了环境变量。鱼类组成、丰度和生物量是响应变量，而物理化学数据、水文属性、河岸特征和底质组成则是预测变量。我们的主要目标是评估河岸土地利用梯度（从保护区到退化区（即森林溪流、草地溪流和城市溪流））对鱼群结构的影响。为此，我们评估了三组溪流之间 ABC 图块及其 W 值的图示关系，并进行了基于海灵格变换的冗余分析（tb-RDA），同时使用 PERMANOVA 检验比较了不同溪流类别之间的鱼类组成。我们发现，森林溪流和城市溪流的 W 值有显著差异，这表明k-战略家向 r-战略家转变；tb-RDA 揭示了三个溪流类别：(i) 森林溪流及其与 Anablepsoides bahianus 和 Parotocinclus cf. jumbo 的关系；(ii) 草地溪流及其与 Anablepsoides bahianus 和 Parotocinclus cf. jumbo 的关系。(ii)草溪及其与 Poecilia vivipara 和 Astyanax cf. bimaculatus 的关系，以及(iii)城市溪流及其与 Poecilia reticulata 和 Oreochromis niloticus 的关系。我们还发现，沿河岸土地利用梯度的鱼类组成存在重大差异，城市溪流与草地溪流和森林溪流存在显著差异。我们观察到，在评价梯度中，本地物种减少，外来物种引入，这与生态位理论的前提是一致的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

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.