Morse Geoffrey E, Farrell Brian D
Department of Entomology, One Shields Avenue, University of California, Davis, CA 95616, USA.
Evolution. 2005 Jun;59(6):1315-33.
Ehrlich and Raven's (1964) hypothesis on coevolution has stimulated numerous phylogenetic studies that focus on the effects of plant defensive chemistry as the main ecological axis of phytophagous insect diversification. However, other ecological features affect host use and diet breadth and they may have very different consequences for insect evolution. In this paper, we present a phylogenetic study based on DNA sequences from mitochondrial and protein-coding genes of species in the seed beetle genus Stator, which collectively show considerable interspecific variation in host affiliation, diet breadth, and the dispersal stage of the seeds that they attack. We used comparative analyses to examine transitions in these three axes of resource use. We argue that these analyses show that diet breadth evolution is dependent upon colonizing novel hosts that are closely or distantly related to the ancestral host, and that oviposition substrate affects the evolution of host-plant affiliation, the evolution of dietary specialization, and the degree to which host plants are shared between species. The results of this study show that diversification is structured by interactions between different selective pressures and along multiple ecological axes.
埃利希和雷文（1964年）提出的协同进化假说激发了众多系统发育研究，这些研究聚焦于植物防御化学作为植食性昆虫多样化主要生态轴的影响。然而，其他生态特征也会影响寄主利用和食性广度，并且它们对昆虫进化可能产生截然不同的后果。在本文中，我们基于种子甲虫属Stator物种线粒体和蛋白质编码基因的DNA序列进行了一项系统发育研究，这些物种在寄主归属、食性广度以及它们所攻击种子的传播阶段上总体表现出相当大的种间差异。我们使用比较分析来研究这三个资源利用轴的转变。我们认为这些分析表明，食性广度的进化依赖于定殖到与祖先寄主密切或疏远相关的新寄主上，并且产卵基质会影响寄主植物归属的进化、食性特化的进化以及物种间共享寄主植物的程度。这项研究的结果表明，多样化是由不同选择压力之间的相互作用以及沿着多个生态轴构建的。
