Comparing the strength of modular signal, and evaluating alternative modular hypotheses, using covariance ratio effect sizes with morphometric data

dc.contributor.author Adams, Dean
dc.contributor.author Collyer, Michael L.
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.date.accessioned 2022-03-29T19:57:25Z
dc.date.available 2022-03-29T19:57:25Z
dc.date.issued 2019-12
dc.description.abstract The study of modularity is paramount for understanding trends of phenotypic evolution, and for determining the extent to which covariation patterns are conserved across taxa and levels of biological organization. However, biologists currently lack quantitative methods for statistically comparing the strength of modular signal across datasets, and a robust approach for evaluating alternative modular hypotheses for the same dataset. As a solution to these challenges, we propose an effect size measure ( ) derived from the covariance ratio, and develop hypothesis-testing procedures for their comparison. Computer simulations demonstrate that displays appropriate statistical properties and low levels of mis-specification, implying that it correctly identifies modular signal, when present. By contrast, alternative methods based on likelihood (EMMLi) and goodness of fit (MINT) suffer from high false positive rates and high model mis-specification rates. An empirical example in sigmodontine rodent mandibles is provided to illustrate the utility of for comparing modular hypotheses. Overall, we find that covariance ratio effect sizes are useful for comparing patterns of modular signal across datasets or for evaluating alternative modular hypotheses for the same dataset. Finally, the statistical philosophy for pairwise model comparisons using effect sizes should accommodate any future analytical developments for characterizing modular signal.
dc.description.comments This is the peer reviewed version of the following article: Adams, Dean C., and Michael L. Collyer. "Comparing the strength of modular signal, and evaluating alternative modular hypotheses, using covariance ratio effect sizes with morphometric data." Evolution 73, no. 12 (2019): 2352-2367, which has been published in final form at DOI:10.1111/evo.13867. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/arY4RRWv
dc.language.iso en
dc.publisher © 2019 The Author(s). Evolution © 2019 The Society for the Study of Evolution.
dc.source.uri https://doi.org/10.1111/evo.13867 *
dc.subject.keywords Morphometrics
dc.subject.keywords modularity
dc.subject.keywords trait covariation
dc.subject.keywords morphological evolution
dc.title Comparing the strength of modular signal, and evaluating alternative modular hypotheses, using covariance ratio effect sizes with morphometric data
dc.type Article
dspace.entity.type Publication
relation.isAuthorOfPublication a0b123a9-ab5f-41a2-879a-581582509519
relation.isOrgUnitOfPublication fb57c4c9-fba7-493f-a416-7091a6ecedf1
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