Small Streams Support Beta Diversity in Neotropical Fish Assemblages in the Upper Paraná River Basin

IF 1.6 3区农林科学 Q3 FISHERIES

Ecology of Freshwater Fish Pub Date : 2024-10-27 DOI:10.1111/eff.12819

Renner Fernando da Silva Córdova Junior, Fabiane Silva Ferreira, Henrique Lopes Ledo Pinho, Alessandro Minillo, Elaine Antoniassi Luiz Kashiwaqui, Yzel Rondon Súarez

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引用次数: 0

Abstract

Variation in species composition along an environmental gradient (β-diversity) can inform our understanding of biodiversity patterns and species composition. Beta diversity can be partitioned into species contributions to beta diversity (SCBD) and local contributions to beta diversity (LCBD). While SCBD describes the variations in species composition among samples, LCBD measures the uniqueness of a biological community within a larger ecosystem. Recently developed metrics enabled the estimation of species contribution to total beta diversity (SCBD) and the contribution of individual sites to total beta diversity (LCBD). Utilising these metrics, a one-time survey of 275 sampling points within four sub-basins of the Upper Paraná River Hydrographic Basin (low-flow streams, < 5 m³/s) was conducted to assess fish community composition. Our results show that limnological influences at different scales contribute to higher LCBD. However, land use and species richness were not directly linked to this outcome, suggesting that sites with fewer fish species along sub-basins contributed to higher beta diversity. It was concluded that beta diversity is more influenced by limnological characteristics and the position of sampling sites along the longitudinal gradient than that based on variations in species composition (SCBD). Moreover, high LCBD values were even found in portions of the gradient with lower species richness. This means that small streams in the sub-basins of the upper Paraná River are unique and are comprised of varied habitats that contribute to increasing diversity. As such, they should be seen as a target in the development of environmental policies designed to conserve their pristine condition.

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在帕拉纳河上游流域，小溪支持新热带鱼群落的β多样性

物种组成沿环境梯度的变化（β-多样性）可以为我们理解生物多样性格局和物种组成提供信息。Beta多样性可分为物种对Beta多样性的贡献（SCBD）和地方对Beta多样性的贡献（LCBD）。SCBD描述的是样本中物种组成的变化，而LCBD衡量的是更大生态系统中生物群落的独特性。最近开发的指标能够估计物种对总β多样性（SCBD）的贡献和单个站点对总β多样性（LCBD）的贡献。利用这些指标，在上帕拉纳河水文盆地（低流量，5 m3/s）的四个子流域内进行了275个采样点的一次性调查，以评估鱼类群落组成。研究结果表明，不同尺度的湖泊影响对高LCBD有贡献。然而，土地利用和物种丰富度与这一结果没有直接联系，这表明沿子流域鱼类种类较少的地点贡献了更高的β多样性。结果表明，β -多样性受湖泊特征和采样点位置沿纵向梯度的影响大于物种组成变化（SCBD）。此外，在物种丰富度较低的部分，LCBD值也较高。这意味着帕拉纳河上游子流域的小溪是独特的，由不同的栖息地组成，有助于增加多样性。因此，它们应被视为制定旨在保护其原始状态的环境政策的目标。

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

Ecology of Freshwater Fish 农林科学-海洋与淡水生物学

CiteScore

4.10

自引率

0.00%

发文量

审稿时长

12-24 weeks

期刊介绍： Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.