Extreme environmental change and evolution: stress-induced morphological variation is strongly concordant with patterns of evolutionary divergence in shrew mandibles
Extreme environmental change and evolution: stress-induced morphological variation is strongly concordant with patterns of evolutionary divergence in shrew mandibles
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DOI：
10.1098/rspb.2000.1011
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发表时间：
2000-02-22
影响因子：
4.7
通讯作者：
Foresman, KR
中科院分区：
文献类型：
--
作者：
Badyaev, AV;Foresman, KR
形态结构通常由更简单的性状组成，这些性状可以被视为整合性状（例如，由于功能相互依赖而相关）或非整合性状（例如，功能独立）。结合长期稳定的选择对整个结构与短期定向选择的适应性重要的子集的性状应导致长期的历史持久性的综合功能复合体？环境引起的变异和宏观进化变化主要局限于非整合性状。我们进行了实验种群的三个密切相关的种Sorex 鼩的环境压力。正如所预测的那样，我们发现，大多数的变化，在鼩的下颌骨形状是本地化之间，而不是在功能复合体，整合的模式没有改变物种之间。胁迫诱导的变异仅限于非整合的试验，并且与进化变化的模式高度一致--物种在同一组对胁迫最敏感的非整合性状上存在差异。我们认为，低的环境和遗传渠道的非集成的trails地图已导致这些性状是最敏感的，不仅对环境，但也与压力相关的遗传扰动。在非整合性状的胁迫诱导和种间变异模式的一致性表明，这些性状的胁迫诱导变异可能在物种分化中发挥重要作用。
Morphological structures often consist of simpler traits which can be viewed as either integrated (e.g. correlated due to functional interdependency) or non-integrated (e.g. functionally independent) traits. The combination of a long-term stabilizing selection on the entire structure with a short-term directional selection on an adaptively important subset of traits should result in long historical persistence of integrated functional complexes? with environmentally induced variation and macroevolutionary change confined mostly to non-integrated traits. We experimentally subjected populations of three closely related species of Sorex shrews to environmental stress. As predicted, we found that most of the variation in shrew mandibular shape was localized between rather than within the functional complexes; the patterns of integration did not change between the species. The stress-induced variation was confined to nonintegrated trails and was highly concordant with the patterns of evolutionary change-species differed in the same set of non-integrated traits which were most sensitive to stress within each species. We suggest that low environmental and genetic canalization of non-integrated trails map have caused these traits to be most sensitive not only to the environmental but also to genetic perturbations associated with stress. The congruence of stress-induced and between-species patterns of variation in non-integrated traits suggests that stress-induced variation in these traits may play an important role in species divergence.