Universidade Federal do Pará, Programa de Pós-Graduação em Zoologia, Instituto de Ciências Biológicas, Rua Augusto Corrêa, 01, Guamá, 66075-110 Belém, PA, Brazil.
Universidade Federal do Pará, Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Rua Augusto Corrêa, 01, Guamá, 66075-110 Belém, PA, Brazil.
An Acad Bras Cienc. 2024 Aug 5;96(suppl 1):e20230496. doi: 10.1590/0001-3765202420230496. eCollection 2024.
The Amazon floodplain is home to an extremely high diversity of fish, with lakes playing an important role in the establishment of this biological richness. These lacustrine environments are subject to constant fluctuations caused by the annual flood pulse, with local factors and other regional patterns also contributing to the variation in fish community structure. The present study verified how local (depth and transparency of the water, the size and species composition of the macrophyte stands) and regional factors (spatial distribution of the stands and the hydrological phase) influence the structure of the fish community of the floodplain lakes of the Môa River, in northern Brazil. Fish species richness was influenced by the depth of the water and the spatial distribution of the macrophyte stands. Fish species composition was influenced by local environmental variables, spatial structure, and the hydrological phase. However, variation partitioning indicated that only the hydrological phase explained the variation in fish composition. These findings indicate that the local environment, the spatial structure, and the hydrological phase drive changes in the structure of the fish communities associated with aquatic macrophytes in the floodplain lakes of the Amazon basin.
亚马逊河漫滩是极高多样性鱼类的家园，湖泊在建立这种生物丰富度方面起着重要作用。这些湖泊环境受到年度洪水脉冲引起的持续波动的影响，当地因素和其他区域模式也导致鱼类群落结构的变化。本研究验证了局部因素（水深和水的透明度、大型植物的大小和物种组成）和区域因素（植物群落的空间分布和水情阶段）如何影响巴西北部莫阿河漫滩湖泊的鱼类群落结构。鱼类物种丰富度受水深和大型植物群落的空间分布影响。鱼类物种组成受局部环境变量、空间结构和水情阶段的影响。然而，变异划分表明，只有水情阶段解释了鱼类组成的变化。这些发现表明，当地环境、空间结构和水情阶段驱动与亚马逊盆地漫滩湖泊水生植物相关的鱼类群落结构的变化。
