Seeholzer Glenn F, Claramunt Santiago, Brumfield Robb T
Museum of Natural Science and Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, 70803.
Department of Natural History, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, M5S2C6, Canada.
Evolution. 2017 Mar;71(3):702-715. doi: 10.1111/evo.13177. Epub 2017 Feb 8.
Rapid diversification may be caused by ecological adaptive radiation via niche divergence. In this model, speciation is coupled with niche divergence and lineage diversification is predicted to be correlated with rates of niche evolution. Studies of the role of niche evolution in diversification have generally focused on ecomorphological diversification but climatic-niche evolution may also be important. We tested these alternatives using a phylogeny of 298 species of ovenbirds (Aves: Furnariidae). We found that within Furnariidae, variation in species richness and diversification rates of subclades were best predicted by rate of climatic-niche evolution than ecomorphological evolution. Although both are clearly important, univariate regression and multivariate model averaging more consistently supported the climatic-niche as the best predictor of lineage diversification. Our study adds to the growing body of evidence, suggesting that climatic-niche divergence may be an important driver of rapid diversification in addition to ecomorphological evolution. However, this pattern may depend on the phylogenetic scale at which rate heterogeneity is examined.
快速多样化可能是由通过生态位分化的生态适应性辐射引起的。在这个模型中，物种形成与生态位分化相关联，并且谱系多样化预计与生态位进化速率相关。对生态位进化在多样化中的作用的研究通常集中在生态形态多样化上，但气候生态位进化也可能很重要。我们使用298种灶鸟（雀形目：灶鸟科）的系统发育来测试这些替代方案。我们发现在内灶鸟科中，与生态形态进化相比，气候生态位进化速率能更好地预测亚分支的物种丰富度和多样化速率的变化。虽然两者显然都很重要，但单变量回归和多变量模型平均更一致地支持气候生态位是谱系多样化的最佳预测指标。我们的研究增加了越来越多的证据，表明除了生态形态进化之外，气候生态位分化可能是快速多样化的一个重要驱动因素。然而，这种模式可能取决于检查速率异质性的系统发育尺度。
