DOI: 10.5061/dryad.vm263
title: Data from: Selection towards different adaptive optima drove the early diversification of locomotor phenotypes in the radiation of Neotropical geophagine cichlids

description: Background: Simpson envisaged a conceptual model of adaptive radiation in
 which lineages diversify into "adaptive zones" within a broad
 adaptive landscape. However only a handful of studies have actually
 investigated the adaptive landscape and its implication for our
 interpretation of the underlying mechanisms of phenotypic evolution. In
 fishes the evolution of locomotor phenotypes may represent an important
 dimension of ecomorphological diversification during an adaptive radiation
 given its implications for feeding and habitat use. Neotropical geophagine
 cichlids represent a newly identified adaptive radiation and provide a
 useful system for studying patterns of locomotor diversification and the
 implications of selective constraints on phenotypic divergence in general.
 Results: We use multivariate ordination models of phenotypic evolution and
 posterior predictive approaches to investigate the adaptive landscape and
 test for evidence of early diversification of locomotor phenotypes in
 Geophagini. The evolution of locomotor phenotypes was characterized by
 divergent selection towards two distinct adaptive peaks and the early
 divergence of modern morphological disparity. Evolutionary models and
 posterior predictive approaches favoured constant-rate divergent selection
 over decreasing rates of phenotypic evolution as the underlying process
 driving the early divergence of locomotor phenotypes. Conclusions: The
 influence of multiple adaptive peaks on the divergence of locomotor
 attributes in Geophagini is compatible with the expectations of an
 ecologically-driven adaptive radiation. This study confirms that the
 diversification of locomotor morphology represents an important dimension
 of phenotypic evolution in the geophagine adaptive radiation. It also
 suggests that the commonly observed early burst of phenotypic evolution
 during adaptive radiations is best explained by a model that incorporates
 divergent selection deep in the phylogeny.
description: Astudillo-Clavijo et al.
 Geophagini_MCC_treeThis file contains a
 Newick-formatted Maximum Clade Credibility tree for the Neotropical
 cichlid tribe Geophagini. The tree has been pruned to include only those
 species used in the study and scaled to a total length of 1 to account for
 uncertainty in absolute ages. The file is readable in R Statistical
 Software and formatted for analyses with the R packages used in the
 study.Geophagini_MCC_tree.phyAstudillo-Clavijo et al. Geophagini_1000_treesThis file contains 1000 Newik-formatted chronograms for the Neotropical cichlid tribe Geophagini. Trees have been pruned to include only those species used in the study and have been scaled to a total length of 1 to account for uncertainty in absolute ages. The files is readable in R Statistical Software and has been formatted for analyses with R packages used in the study.Geophagini_1000_trees.phyAstudillo-Clavijo et al. Geophagini body size dataThis file contains the log-transformed body size (measured as standard length) data for Geophagine cichlid species used in the study. Species names have been formatted to match those in the MCC tree and 1000 trees (provided here) to conduct body-size corrections of morphometric variables (provided here).LOGsl.csvAstudillo-Clavijo et al. Geophagini swimming morphometric variablesThis file contains the log-transformed swimming morphometric data for Geophagine cichlid species used in the study. Species names have been formatted to match those in the MCC tree and 1000 trees (provided here) for body-size correction and comparative analyses using the R packages noted in the study.LOGvariables.csv