Environmental and spatial determinants of fish community structure in an Afro-tropical river ecosystem

IF 1.6 3区 农林科学 Q3 FISHERIES Ecology of Freshwater Fish Pub Date : 2023-05-09 DOI:10.1111/eff.12726
Ogechi Nnabuchi Ugbor, Michael Osasele Omoigberale, Amien Isaac Amoutchi, Kouadio Affian, Thomas Mehner
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Abstract

We investigated the relative influence of local environmental and spatial factors in structuring the community composition of fish at 15 sampling sites along the longitudinal gradient of the Lower Niger River Basin (LNRB) in dry and rainy seasons using distance-based redundancy analysis and variation partitioning analysis. We collected a total of 3807 fish specimens representing 42 species. Our result indicated that the fish community composition differed between the upper and lower regions of the river. The communities in the upper region is influenced by high-nutrient concentrations, while downstream sites were characterized by high concentrations of suspended solids. Variation partitioning revealed higher contributions of spatial than environmental predictors on fish community composition, with a higher total predicted variance in dry season. The variations in the community composition between upper and lower region may be attributable to the differences in the nature of anthropogenic activities within the regions, which influenced the local conditions differently. Differences in flow dynamics between upper and lower regions as attributable to black and white floods in the LNRB modify the connectivity between sites. Dispersal among sites may be more limited downstream than in the upper region, particularly in the dry season, because damming in the upper region also interrupts the natural flood regime such that there are low water levels in the lower region, which spatially isolate fish communities at certain sampling sites. The relatively higher total predicted variance during dry season may be attributable to the temporal differences in abiotic conditions between sites, which may have influenced site level community composition and abundance differently.

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非洲热带河流生态系统中鱼类群落结构的环境和空间决定因素
采用基于距离的冗余分析和变异分区分析方法,研究了尼日尔河下游纵向梯度15个采样点在旱季和雨季对鱼类群落组成的相对影响。共采集到42种3807份鱼类标本。结果表明,黄河上游和下游鱼类群落组成存在差异。上游地区的群落受高营养物浓度的影响,而下游地区则以高浓度的悬浮物为特征。变异分区显示空间因子对鱼类群落组成的贡献大于环境因子,旱季总预测方差较大。上、下游地区群落组成的差异可能是由于区域内人类活动性质的差异,对当地条件的影响不同。由于LNRB的黑色和白色洪水,上游和下游地区之间的流动动力学差异改变了站点之间的连通性。下游地点之间的分散可能比上游地区更有限,特别是在旱季,因为上游地区的水坝也中断了自然洪水制度,使下游地区的水位较低,从而在空间上隔离了某些采样地点的鱼类群落。旱季总预测方差相对较高,可能是由于不同立地间非生物条件的时间差异,这可能对立地水平的群落组成和丰度产生不同的影响。
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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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