Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/129389
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Type: | Journal article |
Title: | Australian Rodents Reveal Conserved Cranial Evolutionary Allometry across 10 Million Years of Murid Evolution |
Author: | Marcy, A.E. Guillerme, T. Sherratt, E. Rowe, K. Phillips, M. Weisbecker, V. |
Citation: | The American Naturalist, 2020; 196(6):755-768 |
Publisher: | University of Chicago Press |
Issue Date: | 2020 |
ISSN: | 0003-0147 1537-5323 |
Statement of Responsibility: | Ariel E. Marcy, Thomas Guillerme, Emma Sherratt, Kevin C. Rowe, Matthew J. Phillips, and Vera Weisbecker |
Abstract: | Among vertebrates, placental mammals are particularly variable in the covariance between cranial shape and body size (allometry), with rodents being amajor exception. Australianmurid rodents allow an assessment of the cause of this anomaly because they radiated on an ecologically diverse continent notably lacking other terrestrial placentals. Here, we use 3D geometric morphometrics to quantify species-level and evolutionary allometries in 38 species (317 crania) from all Australian murid genera. We ask whether ecological opportunity resulted in greater allometric diversity compared with other rodents or whether conserved allometry suggests intrinsic constraints and/or stabilizing selection. We also assess whether cranial shape variation follows the proposed rule of craniofacial evolutionary allometry (CREA), whereby larger species have relatively longer snouts and smaller braincases. To ensure we could differentiate parallel versus nonparallel species-level allometric slopes, we compared the slopes of rarefied samples across all clades.We found exceedingly conserved allometry and CREA-like patterns across the 10-million-year split between Mus and Australian murids. This could support both intrinsicconstraint and stabilizing-selection hypotheses for conserved allometry. Large-bodied frugivores evolved faster than other species along the allometric trajectory, which could suggest stabilizing selection on the shape of the masticatory apparatus as body size changes. |
Keywords: | allometric facilitation; craniofacial evolutionary allometry (CREA); geometric morphometrics; molecular phylogeny; Murinae; stabilizing selection |
Description: | Electronically published October 16, 2020 |
Rights: | © 2020 by The University of Chicago. All rights reserved. |
DOI: | 10.1086/711398 |
Grant ID: | http://purl.org/au-research/grants/arc/DP170103227 |
Published version: | https://www.journals.uchicago.edu/doi/abs/10.1086/711398 |
Appears in Collections: | Aurora harvest 8 Zoology publications |
Files in This Item:
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hdl_129389.pdf | Accepted version | 2.3 MB | Adobe PDF | View/Open |
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