Ecological and phylogenetic influence on mandible shape variation of South American caviomorph rodents (Rodentia: Hystricomorpha)

We analyzed mandible shape variation of 17 genera belonging to three superfamilies (Cavioidea, Chinchilloidea, and Octodontoidea) of South American caviomorph rodents using geometric morphometrics. The relative influence of phylogeny and ecology on this variation was assessed using phylogenetic comp...

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Detalles Bibliográficos
Autores principales: Álvarez, Alicia, Pérez, Sergio Iván, Verzi, Diego Héctor
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Naturales
Comparative methods
Evolutionary history
Geometric morphometrics
Morphological diversification
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84090
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84090
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Comparative methods
Evolutionary history
Geometric morphometrics
Morphological diversification
spellingShingle Ciencias Naturales
Comparative methods
Evolutionary history
Geometric morphometrics
Morphological diversification
Álvarez, Alicia
Pérez, Sergio Iván
Verzi, Diego Héctor
Ecological and phylogenetic influence on mandible shape variation of South American caviomorph rodents (Rodentia: Hystricomorpha)
topic_facet Ciencias Naturales
Comparative methods
Evolutionary history
Geometric morphometrics
Morphological diversification
description We analyzed mandible shape variation of 17 genera belonging to three superfamilies (Cavioidea, Chinchilloidea, and Octodontoidea) of South American caviomorph rodents using geometric morphometrics. The relative influence of phylogeny and ecology on this variation was assessed using phylogenetic comparative methods. Most morphological variation was concentrated in condylar, coronoid, and angular processes, as well as the diastema. Features potentially advantageous for digging (i.e. high coronoid and condylar processes, relatively short angular process, and diastema) were present only in octodontoids; cavioids showed opposing trends, which could represent a structural constraint for fossorial habits. Chinchilloids showed intermediate features. Genera were distributed in the morphospace according to their classification into superfamilial clades. The phylogenetic signal for shape components was significant along phylogeny, whereas the relationship between mandibular shape and ecology was nonsignificant when phylogenetic structure was taken into account. An early evolutionary divergence in the mandible shape among major caviomorph clades would explain the observed strong phylogenetic influence on the variation of this structure.
format Articulo
Articulo
author Álvarez, Alicia
Pérez, Sergio Iván
Verzi, Diego Héctor
author_facet Álvarez, Alicia
Pérez, Sergio Iván
Verzi, Diego Héctor
author_sort Álvarez, Alicia
title Ecological and phylogenetic influence on mandible shape variation of South American caviomorph rodents (Rodentia: Hystricomorpha)
title_short Ecological and phylogenetic influence on mandible shape variation of South American caviomorph rodents (Rodentia: Hystricomorpha)
title_full Ecological and phylogenetic influence on mandible shape variation of South American caviomorph rodents (Rodentia: Hystricomorpha)
title_fullStr Ecological and phylogenetic influence on mandible shape variation of South American caviomorph rodents (Rodentia: Hystricomorpha)
title_full_unstemmed Ecological and phylogenetic influence on mandible shape variation of South American caviomorph rodents (Rodentia: Hystricomorpha)
title_sort ecological and phylogenetic influence on mandible shape variation of south american caviomorph rodents (rodentia: hystricomorpha)
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/84090
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AT perezsergioivan ecologicalandphylogeneticinfluenceonmandibleshapevariationofsouthamericancaviomorphrodentsrodentiahystricomorpha
AT verzidiegohector ecologicalandphylogeneticinfluenceonmandibleshapevariationofsouthamericancaviomorphrodentsrodentiahystricomorpha
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