10.5061/DRYAD.9111KR8
Weaver, Timothy D.
University of California System
Max Planck Institute for Evolutionary Anthropology
Gunz, Philipp
Max Planck Institute for Evolutionary Anthropology
Data from: Using geometric morphometric visualizations of directional
selection gradients to investigate morphological differentiation
Dryad
dataset
2018
neutral evolution
Primates
Form
great apes
Humans
2018-02-22T04:36:11Z
2018-02-22T04:36:11Z
en
https://doi.org/10.1111/evo.13460
3613572 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Researchers studying extant and extinct taxa are often interested in
identifying the evolutionary processes that have lead to the morphological
differences among the taxa. Ideally, one could distinguish the influences
of neutral evolutionary processes (genetic drift, mutation) from natural
selection, and in situations for which selection is implicated, identify
the targets of selection. The directional selection gradient is an
effective tool for investigating evolutionary process, because it can
relate form (size and shape) differences between taxa to the variation and
covariation found within taxa. However, although most modern morphometric
analyses use the tools of geometric morphometrics (GM) to analyze landmark
data, to date, selection gradients have mainly been calculated from linear
measurements. To address this methodological gap, here we present a GM
approach for visualizing and comparing between-taxon selection gradients
with each other, associated difference vectors, and "selection"
gradients from neutral simulations. To exemplify our approach, we use a
dataset of 347 three-dimensional landmarks and semilandmarks recorded on
the crania of 260 primate specimens (112 humans, 67 common chimpanzees, 36
bonobos, 45 gorillas). Results on this example dataset show how
incorporating geometric information can provide important insights into
the evolution of the human braincase, and serve to demonstrate the utility
of our approach for understanding morphological evolution.
WeaverGunz_260ind_347slidlms_logCSThis text file contains the example
dataset used by Weaver and Gunz in their Evolution publication. The rows
correspond to 260 different primate specimens, with the specimen number
and species name given by the rows of
"WeaverGunz_4species_labels.txt" (e.g., row 4 in the labels file
corresponds to row 4 in the dataset file). The full species names are
given in Table 3 of the publication. The columns contain the Procrustes
fit and slid landmarks/semilandmarks and the log Centroid size. Columns
1-3 contain the x, y, and z coordinates of the 1st landmark/semilandmark,
columns 4-6 contain the x, y, and z coordinates of the 2nd
landmark/semilandmark, and so on, up to the 1041st column (z coordinate of
the 347th landmark/semilandmark). The 1042nd column contains the log
Centroid Size. The landmarks/semilandmarks are ordered following Table 1
in the publication.WeaverGunz_4species_labelsThis text file contains the
labels for the example dataset used by Weaver and Gunz in their Evolution
publication. See description of
"WeaverGunz_260ind_347slidlms_logCS.txt" for more
information.WeaverGunz_neutral_simulationsThis text file contains Matlab
code for simulating the "selection" gradients from neutral
divergence used by Weaver and Gunz in their Evolution publication. The
code is meant to be used with the
"WeaverGunz_260ind_347slidlms_logCS.txt" dataset file and the
"WeaverGunz_4species_labels.txt" labels file. Refer to the
publication for details about the methods.WeaverGunz_neutBetaUnit100This
text file contains 100 simulated "selection" gradients from
neutral divergence, which were produced by the Matlab code in the
"WeaverGunz_neutral_simulations.m" file, using the methods
described by Weaver and Gunz in their Evolution publication. Each row
corresponds to a single "selection" gradient from neutral
divergence. See description of
"WeaverGunz_260ind_347slidlms_logCS.txt" for an explanation of
the columns.