Effects of hydrological and spatial seasonality on taxonomic and functional diversity of fish assemblages in an Amazonian floodplain lake

IF 1.6 3区 农林科学 Q3 FISHERIES Ecology of Freshwater Fish Pub Date : 2024-01-13 DOI:10.1111/eff.12770
Severino Adriano de Oliveira Lima, Humber Agrelli Andrade, Raniere Garcez Costa Sousa
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Abstract

The floodplain lakes of the Amazon constitute one of the most important aquatic systems in terms of fish biodiversity. These ecosystems are influenced by the flood pulse, which in turn, affects the behaviour of fish communities within this lake ecosystem. In this study, we tested the hypothesis that the facets of taxonomic and functional diversity may be influenced by the conditions of ‘patches’ of internal habitats, considering the margins and central environments of a floodplain lake in the Amazon. Lake Cujubim, located on the right bank of the Madeira River, was evaluated via fisheries carried out in the high-water and low-water phases, during the day and night, and considering two location strata. The results suggest that the absence of significant differences in alpha taxonomic diversity between the two phases may be a possible seasonal mischaracterisation in Lake Cujubim attributed mainly to dam constructions along the Madeira River. Apparently, no major differences occur in the assembly of fish in terms of their taxonomic and functional characteristics, regardless of luminosity. In the strata of the locations, demonstrates noticeable habitat patches, with the margins being bioregions with high incidences of individuals of the Engraulidae family, confirmed by both taxonomic and functional diversity (alpha and beta). It can be seen that, even in connected lakes, there are differentiated metacommunities between the bioregions, thus forming patches of habitat, and that the shores of the lake, especially those located in proximity or distant from the river, are more suitable areas for food and refuge.

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水文和空间季节性对亚马逊洪泛平原湖泊鱼类群落分类和功能多样性的影响
就鱼类生物多样性而言,亚马逊河洪泛平原湖泊是最重要的水生系统之一。这些生态系统受到洪水脉冲的影响,而洪水脉冲又反过来影响着湖泊生态系统中鱼类群落的行为。在这项研究中,我们考虑到亚马逊洪泛平原湖泊的边缘和中心环境,测试了分类和功能多样性可能受内部栖息地 "斑块 "条件影响的假设。对位于马德拉河右岸的库朱比姆湖(Lake Cujubim)进行了评估,通过在涨水期和退水期、白天和夜晚以及两个位置层进行的渔业活动进行了评估。结果表明,两个阶段的阿尔法分类多样性没有明显差异,这可能是库朱比姆湖的季节性错误特征,主要归因于马德拉河沿岸的水坝建设。显然,无论光度如何,鱼类在分类学和功能特征方面的组合并无重大差异。在这些地点的地层中,显示出明显的栖息地斑块,其边缘是啮齿目鱼科个体出现率较高的生物区,分类学和功能多样性(α和β)都证实了这一点。可以看出,即使在相连的湖泊中,生物区之间也有不同的元群落,从而形成了生境斑块,湖岸,尤其是靠近或远离河流的湖岸,是更适合食物和避难的区域。
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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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