Geographic variation in phenotypic divergence between two hybridizing field cricket species

IF 1 Q3 ENTOMOLOGY
Amy R. Byerly, Clara Jenck, Alexander R. B. Goetz, David B. Weissman, David A. Gray, Charles L. Ross, Luana S. Maroja, Erica L. Larson
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引用次数: 0

Abstract

Patterns of morphological divergence across species’ ranges can provide insight into local adaptation and speciation. In this study, we compared phenotypic divergence among 4,221 crickets from 337 populations of two closely related species of field cricket, Gryllus firmus and G. pennsylvanicus , and their hybrids. We found that these species differ across their geographic range in key morphological traits, such as body size and ovipositor length, and we directly compared phenotype with genotype for a subset of crickets to demonstrate nuclear genetic introgression, phenotypic intermediacy of hybrids, and essentially unidirectional mitochondrial introgression. We discuss how these morphological traits relate to life history differences between the two species. Our comparisons across geographic areas support prior research suggesting that cryptic variation within G. firmus may represent different species. Our study highlights how variable morphology can be across wide-ranging species and the importance of studying reproductive barriers in more than one or two transects of a hybrid zone.
两种杂交蟋蟀表型分化的地理差异
跨物种范围的形态差异模式可以提供对局部适应和物种形成的见解。本研究比较了野地蟋蟀(Gryllus firmus和G. pennsylvanicus)及其杂种337个居群的4221只蟋蟀的表型差异。我们发现这些物种在其地理范围内的关键形态特征(如体型和产卵器长度)存在差异,并且我们直接比较了蟋蟀的一个子集的表型和基因型,以证明核遗传渗入,杂交的表型中间性,以及本质上单向的线粒体渗入。我们讨论了这些形态特征如何与两个物种之间的生活史差异有关。我们跨地理区域的比较支持了先前的研究,表明G. firus内部的隐变可能代表不同的物种。我们的研究强调了如何在广泛的物种中改变形态,以及在杂交带的一个或两个以上的样带中研究生殖障碍的重要性。
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来源期刊
Journal of Orthoptera Research
Journal of Orthoptera Research Agricultural and Biological Sciences-Insect Science
CiteScore
1.90
自引率
25.00%
发文量
20
审稿时长
12 weeks
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