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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A case study of extant and extinct Xenarthra cranium covariance structure: implications and applications to paleontology

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Autor(es):
Hubbe, Alex ; Melo, Diogo ; Marroig, Gabriel
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: PALEOBIOLOGY; v. 42, n. 3, p. 465-488, SUM 2016.
Citações Web of Science: 3
Resumo

Most of the mammalian diversity is known only from fossils, and only a few of these fossils are well preserved or abundant. This undersampling 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 than what is often available for extinct species. One alternative is to use Gor 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 4 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, that 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. (AU)

Processo FAPESP: 12/24937-9 - Evolução craniana dos Xenarthra (Mammalia): modularidade e suas consequências evolutivas na diversificação morfológica
Beneficiário:Alex Christian Rohrig Hubbe
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 11/14295-7 - Modularidade e suas consequências evolutivas
Beneficiário:Gabriel Henrique Marroig Zambonato
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 14/26262-4 - Estimativas diretas de parâmetros evolutivos via análise de loci de traços quantitativos
Beneficiário:Diogo Amaral Reboucas Melo
Linha de fomento: Bolsas no Brasil - Doutorado