Beta-diversity in temperate and tropical forests reflects dissimilar mechanisms of community assembly
Beta-diversity in temperate and tropical forests reflects dissimilar mechanisms of community assembly
复制标题
DOI：
10.1111/ele.12021
复制
发表时间：
2013-02-01
期刊：
影响因子：
8.8
通讯作者：
Seidel, Renate
中科院分区：
文献类型：
--
作者：
Myers, Jonathan A.;Chase, Jonathan M.;Seidel, Renate
物种组成的地点间差异（β多样性）一般从低多样性区域到高多样性区域增加。虽然群落组装机制的地理差异可以解释这种模式，随机抽样效应可以通过区域物种库的差异来创建这种模式。在这里，我们比较了空间广泛的温带和热带森林地块网络之间的组装机制与高度分化的物种池（46与607种）。在控制采样效应后，木本植物的β多样性相似，并高于预期的机会，在两个森林，反映了强烈的种内聚集。然而，不同的机制似乎解释聚集在两个森林。在温带森林中，聚集反映了更强的环境相关性，这表明物种分类（如环境过滤）过程中的重要作用，而在热带地区，聚集反映了更强的空间相关性，更有可能反映扩散限制。我们认为，不同的社区组装机制的相对重要性的地理差异有助于这些惊人的梯度在全球生物多样性。
Site-to-site variation in species composition (beta-diversity) generally increases from low- to high-diversity regions. Although biogeographical differences in community assembly mechanisms may explain this pattern, random sampling effects can create this pattern through differences in regional species pools. Here, we compared assembly mechanisms between spatially extensive networks of temperate and tropical forest plots with highly divergent species pools (46 vs. 607 species). After controlling for sampling effects, beta-diversity of woody plants was similar and higher than expected by chance in both forests, reflecting strong intraspecific aggregation. However, different mechanisms appeared to explain aggregation in the two forests. In the temperate forest, aggregation reflected stronger environmental correlations, suggesting an important role for species-sorting (e.g. environmental filtering) processes, whereas in the tropics, aggregation reflected stronger spatial correlations, more likely reflecting dispersal limitation. We suggest that biogeographical differences in the relative importance of different community assembly mechanisms contribute to these striking gradients in global biodiversity.