Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
Sci Rep. 2024 Sep 17;14(1):21698. doi: 10.1038/s41598-024-70782-z.
Changes in species diversity of different taxa along environmental gradients are usually correlated, resulting in a pattern called cross-taxon congruence. This pattern can be due to functional relationships between taxa, a common response to niche-related processes, or stochastic processes. However, it remains unclear the extent to which they contribute to the association among patterns of changes in species composition, (i.e., beta diversity), and whether these changes are related to species nestedness and turnover. Here we described patterns of change in the taxonomic composition of plant and orthopteran assemblages along an elevational gradient in Cordoba province, central Argentina. We assessed cross-taxon congruence and identified the main environmental variables accounting for such patterns. Mantel correlations showed congruence between the patterns of taxonomic dissimilarity of plants and orthopterans. According Generalized disiimilarity models (GDM) the main environmental variables driving the patterns were temperature for both taxa, and changes in soil nutrient content for plants, spatial effects were also found. Beta diversity was mainly due to species turnover for orthopterans and plants, indicating replacement by species adapted to elevational conditions. Niche-related process, such as environmetal filtering, along with neutral processes may have contributed to cross-taxon congruence in beta diversity.
沿环境梯度的不同分类群的物种多样性变化通常是相关的，导致出现一种称为跨分类群一致性的模式。这种模式可能是由于分类群之间的功能关系、对与生态位相关的过程的共同反应，或随机过程。然而，目前尚不清楚它们在多大程度上促成了物种组成变化模式（即β多样性）之间的关联，以及这些变化是否与物种嵌套和周转率有关。在这里，我们描述了阿根廷中部科尔多瓦省沿海拔梯度的植物和直翅目动物组合的分类组成变化模式。我们评估了跨分类群的一致性，并确定了主要的环境变量来解释这些模式。Mantel 相关性表明植物和直翅目动物的分类差异模式具有一致性。根据广义差异模型（GDM），驱动这些模式的主要环境变量是温度，对这两个分类群都是如此，而植物的土壤养分含量变化也是如此。β多样性主要是由于直翅目动物和植物的物种周转率造成的，这表明物种被适应海拔条件的物种所取代。与生态位相关的过程（如环境过滤）以及中性过程可能促成了β多样性中跨分类群的一致性。
