Coevolution and divergence in the Joshua tree/yucca moth mutualism
Coevolution and divergence in the Joshua tree/yucca moth mutualism
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DOI：
10.1086/587757
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发表时间：
2008-06-01
影响因子：
2.9
通讯作者：
Pellmyr, Olle
中科院分区：
文献类型：
--
作者：
Godsoe, William;Yoder, Jeremy B.;Pellmyr, Olle
理论表明，共同进化驱动专性授粉互惠共生的多样化，但很难将共同进化的影响与其他因素分开。我们测试的假设，差异选择的两个姐妹种授粉丝兰蛾（Tegeticula属）。驱动分歧之间的两个品种的约书亚树（丝兰brevifolia）的花和营养特征的分化措施进行比较。我们发现，与授粉相关的花的功能比外在的相互作用的营养功能更迅速地发展，并且参与互利共生的关键花的功能比任何其他的都更有区别，并且匹配授粉蛾的形态中的等同差异。一个基于遗传学的祖先状态重建表明，蛾形态的差异出现在时间，因为他们第一次成为与约书亚树。这些结果表明，协同进化，而不是外在的环境因素，驱动了这种专性授粉互惠的分歧。
Theory suggests that coevolution drives diversification in obligate pollination mutualism, but it has been difficult to disentangle the effects of coevolution from other factors. We test the hypothesis that differential selection by two sister species of pollinating yucca moths (Tegeticula spp.) drove divergence between two varieties of the Joshua tree (Yucca brevifolia) by comparing measures of differentiation in floral and vegetative features. We show that floral features associated with pollination evolved more rapidly than vegetative features extrinsic to the interaction and that a key floral feature involved in the mutualism is more differentiated than any other and matches equivalent differences in the morphology of the pollinating moths. A phylogenetically based, ancestral states reconstruction shows that differences in moth morphology arose in the time since they first became associated with Joshua trees. These results suggest that coevolution, rather than extrinsic environmental factors, has driven divergence in this obligate pollination mutualism.