Cranial modularity and sequence heterochrony in mammals

Goswami, A. (2007) Cranial modularity and sequence heterochrony in mammals. Evolution and Development, 9 (3). 290 -298. DOI 10.1111/j.1525-142X.2007.00161.x

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Abstract

Heterochrony, the temporal shifting of develop- cranial bone ossification sequences of 12 therian mammals. A dataset of 12--18 developmental events was used to assess if mental events relative to each other, requires a degree of modularity in developmental sequences corresponds to six autonomy among those processes or structures. Modularity, the phenotypic modules, derived from a recent morphometric division of larger structures or processes into autonomous sets analysis of cranial modularity in mammals. Kendall’s t was of internally integrated units, is often discussed in relation to the used to measure rank correlations, with randomization tests concept of heterochrony. However, the relationship between the for significance. If modularity in developmental sequences developmental modules derived from studies of heterochrony corresponds to observed phenotypic modules, bones within and evolutionary modules, which should be of adaptive a single phenotypic module should show integration of importance and relate to the genotype–phenotype map, has developmental timing, maintaining the same timing of not been explicitly studied. I analyzed a series of sectioned and ossification relative to each other, despite differences in whole cleared-and-stained embryological and neonatal overall ossification sequences across taxa. Analyses did not specimens, supplemented with published ontogenetic data, to find any significant conservation of developmental timing test the hypothesis that bones within the same phenotypic within the six phenotypic modules, meaning that bones that are modules, as determined by morphometric analysis, are highly integrated in adult morphology are not significantly developmentally integrated and will display coordinated integrated in developmental timing. heterochronic shifts across taxa. Modularity was analyzed in

Item Type:	Article
Uncontrolled Keywords:	2007 AREP IA54 2007 P
Subjects:	04 - Palaeobiology
Divisions:	04 - Palaeobiology
Journal or Publication Title:	Evolution and Development
Volume:	9
Page Range:	290 -298
Identification Number:	10.1111/j.1525-142X.2007.00161.x
Depositing User:	Sarah Humbert
Date Deposited:	16 Feb 2009 13:02
Last Modified:	23 Jul 2013 10:07
URI:	http://eprints.esc.cam.ac.uk/id/eprint/334

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