Beta diversity can be portioned into local contributions to beta diversity (LCBD), which represents the degree of community composition uniqueness of a site compared to regionally sampled sites. LCBD can fluctuate among seasons and ecoregions according to site characteristics, species dispersal abilities, and biotic interactions. In this context, we examined anuran seasonal patterns of LCBD in different ecoregions of Western Brazil, and assessed their correlation with species richness and if environmental (climatic variables, pond area and ecoregions) and/or spatial predictors (spatial configuration of sampling sites captured by distance-based Moran’s Eigenvector Maps) would drive patterns of LCBD. We sampled anurans in 19 ponds in different ecoregions in the Mato Grosso do Sul state, Western Brazil, during one dry and one rainy season. We found that LCBD patterns were similar between seasons with sites tending to contribute in the same way for community composition uniqueness during the dry and rainy season. Among studied ecoregions, Cerrado showed higher LCBD values in both seasons. In addition, LCBD was negatively correlated with species richness in the dry season. We also found that LCBD variation was explained by ecoregion in the dry season, but in the rainy season both environmental and spatial global models were non-significant. Our results reinforce the compositional uniqueness of the Cerrado ecoregion when compared to the other ecoregions in both seasons, which may be caused by the presence of species with different requirements that tolerate different conditions caused by seasonality.

Beta多样性可以分为对Beta多样性（LCBD）的本地贡献，它表示与区域采样站点相比，站点的社区组成唯一性的程度。LCBD会根据地点特征，物种扩散能力和生物相互作用而在季节和生态区域之间波动。在这种情况下，我们研究了巴西西部不同生态区域LCBD的无色季节模式，并评估了它们与物种丰富度的相关性，以及环境（气候变量，池塘面积和生态区域）和/或空间预测因子（由捕获的采样点的空间结构）基于距离的Moran特征向量图将驱动LCBD模式。在一个干旱和一个雨季期间，我们在巴西西部的马托格罗索州南部不同生态区域的19个池塘中采样了无尾藻。我们发现，LCBD的模式在各个季节之间是相似的，并且在干旱和雨季，站点倾向于以相同的方式为社区组成的独特性做出贡献。在研究过的生态区中，塞拉多的两个季节的LCBD值均较高。此外，在旱季，LCBD与物种丰富度呈负相关。我们还发现，旱季，LCBD的变化是由生态区解释的，但在雨季，环境和空间全局模型均无意义。与两个季节中的其他生态区域相比，我们的研究结果增强了塞拉多生态区域的组成独特性，这可能是由于存在具有不同需求的物种所致，这些物种可以忍受季节性因素造成的不同条件。