Turnover, richness difference and nestedness of rodent assemblages along the southern Andes elevation gradient,Austral Ecology

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Turnover, richness difference and nestedness of rodent assemblages along the southern Andes elevation gradient
Austral Ecology ( IF 1.6 ) Pub Date : 2020-12-03 , DOI: 10.1111/aec.12974
Agustina Novillo _{1,

2} , Ricardo Ojeda ₂

Affiliation

Beta diversity in ecological communities can reflect adaptations of species to differences in climate, environmental characteristics and site history, as well as local ecological dynamics. These dissimilarities among communities may reflect different processes as species replacement and richness difference or nestedness, which can be generated by different factors. Assemblages in mountain regions are expected to exhibit high beta diversity due to sharp environmental variation and historical events promoting isolation. Diversity patterns of small mammals along elevation gradients in the southern dry Andes exhibit high richness among high elevations and a humped shape pattern for abundances. However, it is not clear how beta diversity changes along this gradient, or the processes involved in this variation. Here we aim to evaluate small mammal beta diversity patterns along the elevation gradient. Therefore, we decomposed beta diversity into spatial turnover, richness differences and richness differences as a result of nestedness. Assemblage structure variation was assessed qualitatively and quantitatively. Also, we evaluate the local contribution of beta diversity (LCBD) and species contribution to beta diversity, to identify priority conservation sites and species. Our results show contrasting patterns among qualitative and quantitative beta diversity components. The former was mainly explained by species turnover, while the latter showed a higher contribution of richness difference than species turnover. Most components of beta diversity decreased with elevation, except for abundance turnover that showed an opposite trend. Furthermore, LCBD was higher at lower and mid‐elevation sites and exhibited a negative relationship with species richness and abundance.

中文翻译：

南部安第斯山脉海拔梯度上啮齿类动物种群的周转，丰富度差异和嵌套

生态社区中的贝塔多样性可以反映物种对气候，环境特征和地点历史以及当地生态动态差异的适应性。群落之间的这些差异可能反映了不同的过程，如物种置换和丰富度差异或嵌套，这可能是由不同因素引起的。由于急剧的环境变化和促进孤立的历史事件，预计山区的集合体将表现出较高的beta多样性。南部干旱安第斯山脉沿海拔梯度的小型哺乳动物的多样性格局在高海拔地区表现出很高的丰富度，并且呈丰满的驼峰形状格局。但是，尚不清楚β多样性如何沿着该梯度变化，或这种变化所涉及的过程。在这里，我们旨在评估沿海拔梯度的小型哺乳动物β多样性模式。因此，由于嵌套，我们将β多样性分解为空间周转率，丰富度差异和丰富度差异。组装结构的变化进行了定性和定量评估。此外，我们评估了β多样性（LCBD）的本地贡献和物种对β多样性的贡献，从而确定了优先保护区和物种。我们的结果显示出定性和定量β多样性成分之间的对比模式。前者主要由物种周转来解释，而后者则比物种周转对丰富度差异的贡献更大。β多样性的大多数组成部分都随海拔升高而下降，但丰度周转率却呈现相反趋势。此外，

更新日期：2020-12-03

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