Assessing Site and Species Associations With Beta Diversity of Fish Assemblages in Amazonian Streams

IF 2.8 2区生物学 Q2 ECOLOGY

Freshwater Biology Pub Date : 2025-01-26 DOI:10.1111/fwb.70001

Maria Dayanne Lima de Lucena, André Ribeiro-Martins, Lilian Casatti, Thiago Bernardi Vieira, Gabriel Lourenço Brejão, Fernando Rogério Carvalho, Thaisa Sala Michelan, Leandro Juen, Luciano Fogaça de Assis de Montag

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引用次数: 0

Abstract

The increasing environmental changes threatening the fish fauna of streams are driving a growing interest in understanding how sites and species contribute to diversity, as this is important information for decision-making related to the management and conservation of priority areas and species. The objective of this study was to understand how environmental factors, spatial distance between streams, land use, and land cover (landscape) may be associated with the uniqueness of fish assemblages in Amazonian streams.
We sampled fish assemblages and characterised environmental conditions in 29 streams within and around the Tapajós River basin, near the Amazon National Park in Brazil. Each stream was studied along a 150-m stretch.
The variables associated with the local contribution to beta diversity (LCBD) were vegetation cover and the presence of refuges. Streams inside and outside the park showed similar contributions to beta diversity. Species richness and abundance showed a negative relationship with LCBD, suggesting that unique sites tended to have few species and low abundance. The species that contributed most to beta diversity (SCBD) had intermediate occurrence, high abundance, and non-marginal niches. We did not observe an effect of niche breadth on SCBD, as both generalist and specialist species contributed equally to beta diversity.
Our findings underscore the role of environmental variables in ecological uniqueness. Sites unique in species composition may also exhibit low species richness and abundance.
Our study demonstrates the importance of environmental variables in conserving biodiversity in Amazonian streams in the face of environmental changes. By examining the contributions of sites and species, we highlight the importance of considering habitat quality and uniqueness in protecting these ecosystems against the challenges of global change.

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评估亚马逊溪流中鱼类组合的 Beta 多样性与地点和物种的关系

越来越多的环境变化威胁着溪流中的鱼类区系，这促使人们对了解地点和物种如何促进多样性产生了越来越大的兴趣，因为这是与管理和保护优先区域和物种相关的决策的重要信息。本研究的目的是了解环境因素、河流之间的空间距离、土地利用和土地覆盖（景观）如何与亚马逊河流中鱼类组合的独特性相关联。我们在巴西亚马逊国家公园附近的Tapajós河流域及其周围的29条溪流中取样了鱼类组合并描述了环境条件。每条溪流沿着150米的长度进行了研究。与当地对beta多样性（LCBD）的贡献相关的变量是植被覆盖和避难所的存在。公园内外的溪流对beta多样性的贡献相似。物种丰富度和丰度与LCBD呈负相关关系，表明独特立地倾向于物种少、丰度低。对β多样性（SCBD）贡献最大的物种为中等发生率、高丰度和非边际生态位。我们没有观察到生态位宽度对SCBD的影响，因为通才和专才物种对β多样性的贡献相同。我们的发现强调了环境变量在生态独特性中的作用。物种组成独特的地点也可能表现出较低的物种丰富度和丰度。我们的研究表明，面对环境变化，环境变量在保护亚马逊河流生物多样性方面的重要性。通过研究地点和物种的贡献，我们强调了考虑栖息地质量和独特性在保护这些生态系统免受全球变化挑战方面的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Freshwater Biology 生物-海洋与淡水生物学

CiteScore

5.90

自引率

3.70%

发文量

162

审稿时长

2 months

期刊介绍： Freshwater Biology publishes papers on all aspects of the ecology of inland waters, including rivers and lakes, ground waters, flood plains and other freshwater wetlands. We include studies of micro-organisms, algae, macrophytes, invertebrates, fish and other vertebrates, as well as those concerning whole systems and related physical and chemical aspects of the environment, provided that they have clear biological relevance. Studies may focus at any level in the ecological hierarchy from physiological ecology and animal behaviour, through population dynamics and evolutionary genetics, to community interactions, biogeography and ecosystem functioning. They may also be at any scale: from microhabitat to landscape, and continental to global. Preference is given to research, whether meta-analytical, experimental, theoretical or descriptive, highlighting causal (ecological) mechanisms from which clearly stated hypotheses are derived. Manuscripts with an experimental or conceptual flavour are particularly welcome, as are those or which integrate laboratory and field work, and studies from less well researched areas of the world. Priority is given to submissions that are likely to interest a wide range of readers. We encourage submission of papers well grounded in ecological theory that deal with issues related to the conservation and management of inland waters. Papers interpreting fundamental research in a way that makes clear its applied, strategic or socio-economic relevance are also welcome. Review articles (FRESHWATER BIOLOGY REVIEWS) and discussion papers (OPINION) are also invited: these enable authors to publish high-quality material outside the constraints of standard research papers.