Model adequacy and the macroevolution of angiosperm functional traits

Matthew W. Pennell*, Richard G. Fitzjohn, William K. Cornwell, Luke J. Harmon

*Corresponding author for this work

Research output: Contribution to journalArticle

74 Citations (Scopus)
3 Downloads (Pure)

Abstract

Making meaningful inferences from phylogenetic comparative data requires a meaningful model of trait evolution. It is thus important to determine whether the model is appropriate for the data and the question being addressed. One way to assess this is to ask whether the model provides a good statistical explanation for the variation in the data. To date, researchers have focused primarily on the explanatory power of a model relative to alternative models. Methods have been developed to assess the adequacy, or absolute explanatory power, of phylogenetic trait models, but these have been restricted to specific models or questions. Here we present a general statistical framework for assessing the adequacy of phylogenetic trait models. We use our approach to evaluate the statistical performance of commonly used trait models on 337 comparative data sets covering three key angiosperm functional traits. In general, the models we tested often provided poor statistical explanations for the evolution of these traits. This was true for many different groups and at many different scales. Whether such statistical inadequacy will qualitatively alter inferences drawn from comparative data sets will depend on the context. Regardless, assessing model adequacy can provide interesting biological insights—how and why a model fails to describe variation in a data set give us clues about what evolutionary processes may have driven trait evolution across time.

Original languageEnglish
Pages (from-to)E33-E50
Number of pages18
JournalAmerican Naturalist
Volume186
Issue number2
DOIs
Publication statusPublished - Aug 2015

Bibliographical note

Copyright the Publisher 2015. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • Angiosperm functional traits
  • Independent contrasts
  • Model adequacy
  • Phylogenetic comparative methods

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