Habitat heterogeneity in the Pantanal results from flood dynamics and vegetation characteristics. Considering that these impacts affect landbird nesting conditions and food resource availability, species turnover and richness should respond to them. We conducted this study in the northeastern Pantanal, in two dominant habitats, savanna and forest, covering two annual cycles. The objectives were: (1) evaluation of trophic structure, (2) analyses of species dissimilarity patterns, and (3) investigation of whether seasonal changes in the flood regime and/or vegetation characteristics drive these patterns. We used mist nests to acquire data on bird species composition, abundance, and guilds. Insectivore and omnivore species were the predominant guilds. The bird community showed very high overall dissimilarity, with a Jaccard Index of 0.86, with 86% attributed to species replacement and 14% to species nestednesss. This high dissimilarity reflects the reduced number of shared species, mainly between some savannas and forests (12%). Our analyses also showed that habitat characteristics, specifically the differences in vegetation structure and composition, mostly explained the species turnover. Flood seasonality was also an important driver of bird community spatial variability, in which dissimilarities in species composition increased from the terrestrial to the aquatic phases, with the wettest phase being the most dissimilar.

潘塔纳尔湿地的生境异质性是由洪水动态和植被特征造成的。考虑到这些影响会影响陆鸟的筑巢条件和粮食资源的可获得性，因此物种周转率和丰富度应对此做出反应。我们在潘塔纳尔（Pantana）东北部的两个主要生境大草原和森林中进行了这项研究，涵盖两个年度周期。目标是：（1）营养层结构的评估；（2）物种异质性模式的分析；（3）调查洪水制度和/或植被特征的季节性变化是否驱动了这些模式。我们使用薄雾巢获取有关鸟类物种组成，丰度和行会的数据。食虫和杂食动物是主要的行会。鸟类群落的总体相似度非常高，Jaccard指数为0.86，其中86％归因于物种替代，而14％归因于物种嵌套。这种高度差异反映了共有物种的数量减少，主要是在一些稀树草原和森林之间（12％）。我们的分析还表明，栖息地的特征，特别是植被结构和组成的差异，可以解释物种的更新。洪水季节也是鸟类群落空间变异的重要驱动力，其中鸟类组成的差异从陆相到水生相增加，最湿相最相似。特别是植被结构和组成的差异，主要解释了物种更新。洪水季节也是鸟类群落空间变异的重要驱动力，其中鸟类组成的差异从陆相到水生相都在增加，而最湿相则最为相似。特别是植被结构和组成的差异，主要可以解释物种更新。洪水季节也是鸟类群落空间变异的重要驱动力，其中鸟类组成的差异从陆相到水生相都在增加，而最湿相则最为相似。