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Artículo

A comparative analysis on cranial ontogeny of South American fur seals (Otariidae: Arctocephalus)

Tarnawski, Bárbara AlejandraIcon ; Flores, David AlfredoIcon ; Cassini, Guillermo HernánIcon ; Cappozzo, Humberto LuisIcon
Fecha de publicación: 01/2015
Editorial: Wiley Blackwell Publishing, Inc
Revista: Zoological Journal of the Linnean Society
ISSN: 0024-4082
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Zoología, Ornitología, Entomología, Etología

Resumen

We analysed the cranial ontogeny of male Arctocephalus australis (Zimmermann, 1783) (N=116), Arctocephalus gazella (Peters, 1875) (N=69), and Arctocephalus tropicalis (Gray, 1872) (N=51) to study skull growth and its allometric patterns in the genus. We used 15 metric variables with bivariate and multivariate approaches to detect interspecific similarities and differences between growth trends, which we discussed in the context of phylogeny and life history. We found common trajectories in 20% of variables, detecting that the differences between adults were associated with size. We detected higher growth rates in A.gazella than in A.australis and A.tropicalis, which were associated with shape differences. Amongst the three species, A.tropicalis was morphologically intermediate, showing additional common trends with A.gazella and A.australis, and an intermediate position in the multivariate morphospace. Allometric patterns were also compared with growth trends described for Otaria byronia (Péron, 1816) and Mirounga leonina (Linnaeus, 1758). We detected positive allometry in Arctocephalus for the mastoid width (MW) but negative allometry in O.byronia and M.leonina. This could indicate that males of Arctocephalus exhibited a delayed development of MW. Finally, the presence of common growth trends for the skull length and the postorbital constriction could indicate a conservative pattern within otariids.
Palabras clave: ARCTOPHOCA , CRANIAL MORPHOMETRY , ONTOGENY , PINNIPEDIA , SKULL , TAXONOMY
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/84466
URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/zoj.12197
DOI: http://dx.doi.org/10.1111/zoj.12197
Colecciones
Articulos(MACNBR)
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Citación
Tarnawski, Bárbara Alejandra; Flores, David Alfredo; Cassini, Guillermo Hernán; Cappozzo, Humberto Luis; A comparative analysis on cranial ontogeny of South American fur seals (Otariidae: Arctocephalus); Wiley Blackwell Publishing, Inc; Zoological Journal of the Linnean Society; 173; 1; 1-2015; 249-269
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