考虑扩散成本以了解北美高梯度流域鱼类群落的差异

IF 1.6 3区 农林科学 Q3 FISHERIES
Breno Laio Medeiros de Rezende, Renato Bolson Dala-Corte, Adriano S. Melo
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引用次数: 0

摘要

如果考虑到河流网络的树枝状结构,就能最好地理解淡水鱼类元群落。树枝状结构对与连通性相关的扩散施加了限制。许多结构对鱼类活动的限制更大,如水坝和地形坡度(扩散成本)。我们利用广义相似性建模(GDM)研究了环境预测因子和扩散成本对田纳西河上游淡水鱼贝塔多样性的影响。此外,我们还测试了非对称扩散成本(上游扩散成本高)对本地和非本地鱼类嵌套性的影响。在 GDM 模型中,环境预测因子比扩散成本更能解释鱼类的整体差异,与物种丰富度差异相比,更替率占据了大部分解释因素。水坝高度是 GDM 中最重要的扩散成本变量,主要用于物种更替。与非本地鱼类相比,环境和扩散变量能更好地解释本地鱼类亚群的总体差异(20.03% 对 8.41%)。考虑到本地物种集合子集,与成对地点之间最大河道坡度和水道距离有关的扩散成本提高了上下游相邻地点的嵌套度,而与水坝有关的扩散成本则降低了嵌套度。研究结果表明,大坝增加了田纳西河上游流域本地鱼类元群落的整体差异性,同时也降低了相邻地点的嵌套度。我们的研究结果增进了人们对在大坝影响下流域中与扩散成本相关的机制和过程如何产生异质性和嵌套性模式的了解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Considering dispersal costs to understand fish community dissimilarity in a high-gradient basin of North America

Freshwater fish metacommunities are best understood when considering the dendritic structure of riverine networks. The dendritic structure imposes restrictions to dispersal associated with the connectivity. Many structures restrict the movement of fish even more, such as dams and the terrain slope (dispersal costs). We investigated the influence of environmental predictors and dispersal costs on the beta diversity of freshwater fishes from the Upper Tennessee River using Generalised Dissimilarity Modelling (GDM). In addition, we tested the effects of asymmetrical dispersal costs (high costs for upstream dispersal) on the nestedness of native and non-native fishes. Environmental predictors were more important than dispersal costs for explaining the overall fish dissimilarity in the GDM models, with the turnover capturing most of the explanation compared to the species richness difference. Dam heights were the most important dispersal cost variable in the GDM, mainly for species turnover. Overall dissimilarity of the native fish subset was better explained by environmental and dispersal variables than non-native fish (20.03% vs. 8.41%). Considering the native species assemblage subset, dispersal cost related to maximum channel slope between pairs of sites and watercourse distance increased the nestedness of adjacent upstream–downstream sites, whereas those attributed to dams reduced the nestedness. The results support that dams increase overall dissimilarity in the native fish metacommunity of the Upper Tennessee basin, but also reduce the nestedness of adjacent sites. Our findings improve the knowledge on how mechanisms and processes associated with dispersal costs in watersheds under the effects of dams create patterns of dissimilarity and nestedness.

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来源期刊
Ecology of Freshwater Fish
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
45
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.
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