Universidade Estadual de Maringá - UEM, Departamento de Biologia, Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Laboratório de Ictiologia e Ecoestatística, Maringá, PR, Brasil.
Universidade Estadual de Maringá - UEM, Departamento de Biologia, Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Laboratório da Coleção Ictiológica do Nupélia, Maringá, PR, Brasil.
Braz J Biol. 2021 Jul-Sep;81(3):765-775. doi: 10.1590/1519-6984.230833. Epub 2021 Aug 31.
In aquatic environments, dams are considered one of the main threats to fish species, acting as an environmental filter for certain functional traits. Although there is some predictability in the composition of the functional traits in reservoirs, it is hypothesized that the environmental filters imposed by evolutionary processes, linked to the characteristics of the basins, are determinant for the functional composition of the traits in reservoirs. For this we performed a PCoA using the functional traits composition matrix of the reservoirs. We used PERMANOVA to test the difference in functional composition between basins. We performed the same process for the species composition matrix to compare the patterns. In this study, there were taxonomic and functional differences among reservoirs inserted in different basins. It was observed that the basin is a determining factor for the functional structure of fish assemblage in reservoirs. When compared, functional and taxonomic structures follow the same pattern, although functionally the reservoir tends to be more similar. These results reinforce the idea that reservoirs act as filters for functional traits (e.g., related with reproduction, feeding and habitat use), although there is a great influence of evolutionary processes related to the basin's characteristics and origin of the ichthyofaunistic province.
在水生环境中，大坝被认为是鱼类物种的主要威胁之一，它们对某些功能特征起着环境过滤器的作用。尽管水库中功能特征的组成具有一定的可预测性，但据推测，进化过程中与盆地特征有关的环境过滤器对水库中功能特征的组成具有决定性作用。为此，我们使用水库功能特征组成矩阵进行了 PCoA。我们使用 PERMANOVA 来检验盆地之间功能组成的差异。我们对物种组成矩阵进行了相同的处理，以比较模式。在这项研究中，插入不同盆地的水库存在分类和功能差异。观察到盆地是水库中鱼类组合功能结构的决定因素。进行比较时，功能和分类结构遵循相同的模式，尽管功能上水库更相似。这些结果强化了这样一种观点，即水库对功能特征（例如与繁殖、摄食和生境利用有关的特征）起到了过滤器的作用，尽管与盆地特征和鱼类区系起源有关的进化过程有很大影响。
