Temperature drives local contributions to beta diversity in mountain streams: Stochastic and deterministic processes

作者：Jianjun Wang, Pierre Legendre, Janne Soininen, Chih‐Fu Yeh, Emily Graham, James Stegen, Emilio O. Casamayor, Jizhong Zhou, Ji Shen, Feiyan Pan · 发表于：Global Ecology and Biogeography · 年份：2019 · DOI：10.1111/geb.13035 · 被引用次数：67 · 研究领域：Microbial Community Ecology and Physiology、Freshwater macroinvertebrate diversity and ecology、Species Distribution and Climate Change

Abstract Aim Community variation (i.e. beta diversity) along geographical gradients is of substantial interest in ecology and biodiversity reserves in the face of global changes. However, the generality in beta diversity patterns and underlying processes remains less studied across trophic levels and geographical regions. We documented beta diversity patterns and underlying ecological processes of stream bacteria, diatoms and macroinvertebrates along six elevational gradients. Locations Asia and Europe. Methods We examined stream communities using molecular and morphological methods. We characterised community uniqueness with local contributions to beta diversity (LCBD), and investigated the drivers of its geographic patterns using Mid‐Domain Effect (MDE), coenocline simulation, Raup‐Crick null model approach, and through comparisons to environmental factors. MDE is a stochastic model by considering species elevational range, while coenocline simulation is a deterministic model by considering species niche optima and tolerance. The null model provides possible underlying mechanisms of community assembly with the degree to which deterministic processes create communities deviating from those of null expectations. Results Across all taxa, we revealed a general U‐shaped LCBD‐elevation relationship, suggesting higher uniqueness of community composition at both elevational ends. This pattern was confirmed and could be explained by both stochastic and deterministic models, that is,...