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Seasonal hydrology and fish assemblage structure in the floodplain of the lower Amazon River
Ecology of Freshwater Fish ( IF 1.8 ) Pub Date : 2020-09-22 , DOI: 10.1111/eff.12572
Poliane B. Silva 1 , Caroline C. Arantes 2, 3 , Carlos E. C. Freitas 4 , Miguel Petrere 5 , Frank R. V. Ribeiro 1
Affiliation  

We investigated how the taxonomic and functional structures of fish assemblages in the lower Amazon River floodplain responded to seasonal hydrological variations. Fishes were sampled in 440 aquatic habitats across a floodplain area of 17,673 km2 during periods of high, receding, low and rising water. In addition, we recorded local environmental and landscape variables known to affect fish assemblages in floodplains. Redundancy analysis indicated that the taxonomic and functional structures of the fish assemblages were associated with water levels as well as local environmental, landscape and spatial variables. Our results showed that piscivores, planktivores and omnivores, as well as species with periodic and intermediate life history strategies, dominated the floodplain fish assemblages during periods of high‐water levels, whereas herbivores, invertivores and detritivores, as well as species of large body size with an equilibrium life history strategy, dominated the fish assemblages during periods of low‐water levels. Hydrology strongly influenced the structure of the fish assemblages in the Amazon floodplains. Our results indicate that the maintenance of seasonal hydrological dynamics in the basin is essential for the conservation of the regional fish diversity.

中文翻译:

亚马逊河下游漫滩的季节性水文学和鱼类组合结构

我们调查了亚马逊河下游平原上鱼群的分类和功能结构如何响应季节性水文变化。在17,673 km 2的洪泛区中的440个水生生境中对鱼类进行了采样在水位高,后退,水位低和上升的时期。此外,我们记录了已知会影响洪泛区鱼群的当地环境和景观变量。冗余分析表明,鱼群的分类和功能结构与水位以及局部环境,景观和空间变量有关。我们的结果表明,食水动物,浮游动物和杂食动物以及具有周期性和中期生活史策略的物种在高水位时期主导着洪泛区鱼类种群,而食草动物,食虫和碎屑动物以及大体形物种采用平衡的生活史策略,在水位低时,鱼群处于支配地位。水文学极大地影响了亚马逊河漫滩中鱼群的结构。我们的结果表明,维持流域季节性水文动态对于保护区域鱼类多样性至关重要。
更新日期:2020-09-22
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