10.5061/DRYAD.6BR16
Hubbe, Alex
Federal University of Bahia
Melo, Diogo
University of Sao Paulo
Marroig, Gabriel
University of Sao Paulo
Data from: A case study of extant and extinct Xenarthra cranium covariance
structure: implications and applications to paleontology
Dryad
dataset
2016
Mammalia
Xenarthra
P-matrix
G-matrix
2016-10-26T00:00:00Z
en
https://doi.org/10.1017/pab.2015.49
8347619 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Most of the mammalian diversity is known only from fossils, and only a few
of these fossils are well preserved or abundant. This under sampling poses
serious problems for understanding mammalian phenotypic evolution under a
quantitative genetics framework, since this framework requires estimation
of a group's additive genetic variance-covariance matrix (G-matrix),
which is impossible, and estimating a phenotypic variance-covariance
matrix (P-matrix) requires larger sample sizes then what is often
available for extinct species. One alternative is to use G- or P-matrices
from extant taxa as surrogates for the extinct ones. Although there are
reasons to believe this approach is usually safe, it has not been fully
explored. By thoroughly determining the extant and some extinct Xenarthra
(Mammalia) cranium P-matrices, this study aims to explore the feasibility
of using extant G- or P-matrices as surrogates for the extinct ones, and
to provide guidelines regarding the reliability of this strategy and the
necessary sample sizes. Variance-covariance and correlation P-matrices for
35 cranium traits from 16 xenarthran genera (12 extant and four extinct)
were estimated and compared between genera. Results show xenarthran
P-matrix structures are usually very similar if sample sizes are
reasonable. This study and others developed with extant therian mammals
suggest, in general, using extant G- or P-matrices as an approximation to
extinct ones is a valid approach. Nevertheless, the accuracy of this
approach depends on sample size, selected traits and the type of matrix
being considered.
supplementary materialsupplementary text + supplementary figures +
supplementary tablesall_supplementary_material.pdf
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