首页|Sexual dimorphism in cranial shape and size in geomyoid rodents: multivariate and evolutionary perspectives

Sexual dimorphism in cranial shape and size in geomyoid rodents: multivariate and evolutionary perspectives

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Geomyoid rodents provide a great study system for the analysis of sexual dimorphism. They are polygynic and many inhabit harsh arid environ-ments thought to promote sexual dimorphism. In fact, there has been extensive work published on the sexual size dimorphism of individual populations and species within this rodent clade. However, little work has been undertaken to assess the evolutionary patterns and processes associated with this sexual dimorphism. We use multivariate analyses of cranial measurements in a phylogenetic framework to determine the distribution of size and shape dimorphism among geomyoids and test for Rensch's rule. Our results suggest that sexual dimorphism is more common in geomyids than heteromyids, but it is not in fact universal. There is evidence for variation in sexual dimorphism across populations. Additionally, in many taxa, geographic variation appears to overwhelm existing sexual dimorphism. We find support for the repeated independ-ent evolution of shape and size dimorphism across geomyoid taxa, but we do not find support for an association between size and shape dimorphism. There is no evidence for Rensch's rule in geomyoids, whether at the superfamily or family level. Together, our findings suggest that there is no single explanation for the evolution of sexual dimorphism in geomyoids and that, instead, it is the product of numerous evolutionary events. Future studies incorporating phylogenetic relationships will be necessary to paint a more complete picture of the evolution of sexual dimorphism in geomyoids.

GeomyidaeHeteromyidaephylogenetic comparative methodsmorphometricsRensch's rule

Jonathan J M Calede、Andrew Brown

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Department of Evolution,Ecology,and Organismal Biology,The Ohio State University,318 W.12th Ave.,300 Aronoff Laboratory,Columbus,OH 43210,USA

The Ohio State University at Marion,1459 Mount Vernon Avenue,Marion,OH 43302,USA

a Paleontological Society Norman Newel Award,a College of Arts and Sciences Regional Campus Research and Creative Activity GrantOhio State University at Marionstartup funds from the Ohio State Universitya Meaningful Inquiry grant from the Ohio State University library system

2022

动物学报(英文版)
中国科学院动物研究所,中国动物学会

动物学报(英文版)

CSCDSCI
影响因子：0.198
ISSN：1674-5507
年,卷(期)：2022.68(4)
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