Evidence for determinism in species diversification and contingency in phenotypic evolution during adaptive radiation
Evidence for determinism in species diversification and contingency in phenotypic evolution during adaptive radiation
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DOI：
10.1098/rspb.2012.1669
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发表时间：
2012-12-07
影响因子：
4.7
通讯作者：
Pyron, R. Alexander
中科院分区：
文献类型：
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作者：
Burbrink, Frank T.;Chen, Xin;Pyron, R. Alexander
适应性辐射（AR）理论预测，共享相同生态机会（EO）来源的群体将经历确定性的物种多样化和形态进化。因此，确定性的生态和形态进化应该与相似栖息地和时间段内群体的物种形成速度和模式的确定性模式相关。我们使用渐新世晚期殖民新大陆（NW）的四个有鳞类群的系统发育学样本来检验这一假设。我们使用标准模型和合并模型来评估物种多样化，并使用可能性模型来检查形态进化。所有有鳞类群都表现出相似的早期物种形成脉冲，以及在大陆范围内对进化枝大小的多样性依赖的生态限制。相比之下，形态进化的过程不容易预测，也不会表现出类似的早期和快速变化的脉冲。因此，这些群体的形态和物种多样化模式似乎是不相关的。这表明，即使在经历相同环氧乙烷来源的相似类群中，驱动多样化和差异化的过程也没有机械联系。它还表明，不能仅根据 AR 的存在或对多样化过程的了解来预测表型多样化的过程。
Adaptive radiation (AR) theory predicts that groups sharing the same source of ecological opportunity (EO) will experience deterministic species diversification and morphological evolution. Thus, deterministic ecological and morphological evolution should be correlated with deterministic patterns in the tempo and mode of speciation for groups in similar habitats and time periods. We test this hypothesis using well-sampled phylogenies of four squamate groups that colonized the NewWorld (NW) in the Late Oligocene. We use both standard and coalescent models to assess species diversification, as well as likelihood models to examine morphological evolution. All squamate groups show similar early pulses of speciation, as well as diversity-dependent ecological limits on clade size at a continental scale. In contrast, processes of morphological evolution are not easily predictable and do not show similar pulses of early and rapid change. Patterns of morphological and species diversification thus appear uncoupled across these groups. This indicates that the processes that drive diversification and disparification are not mechanistically linked, even among similar groups of taxa experiencing the same sources of EO. It also suggests that processes of phenotypic diversification cannot be predicted solely from the existence of an AR or knowledge of the process of diversification.