Morphological variation in two sigmodontine rodents along the mainland and the Fuegian archipelago in Chilean southern Patagonia

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dc.contributor.authorValladares Gómez, Alejandro Andrés
dc.contributor.authorHuenumilla Linares, Marcela Ivette
dc.contributor.authorPalma Vásquez, Ramón Eduardo
dc.contributor.authorRodríguez Serrano, Enrique Alfonso
dc.contributor.authorHernández Ulloa, Cristián Esteban
dc.date.accessioned2020-07-21T11:53:20Z
dc.date.available2020-07-21T11:53:20Z
dc.date.issued2020
dc.date.updated2020-07-19T00:06:19Z
dc.description.abstractAbstract Background Analysis of morphological variation in archipelagos has been essential to understand the evolution of terrestrial vertebrates. In particular, these natural scenarios allow to assess morphological changes experienced by insular fauna compared to their mainland counterparts. In mammals, morphological changes of insular forms have been observed in size and shape of body and cranial traits. The southern Patagonia of Chile represents a unique scenario to analyze morphological variation in two of the most widely distributed small rodents along western southern South America: Abrothrix olivacea and Oligoryzomys longicaudatus. Methods We applied linear and three-dimensional geometric morphometric tools to analyze the variation in cranial morphology of A. olivacea (N = 80) and O. longicaudatus (N = 49). Sampled localities were distributed in the mainland and islands of the Fuegian archipelago in Chilean Patagonia. Standard multivariate methods, as Principal Components Analysis, and Logistic Regression models were carried out to evaluate differences in size and shape of crania. Results We detected higher levels of morphological variation in the crania of A. olivacea if compared to O. longicaudatus. The variation was associated to cranial size instead of shape. We observed significant differences between insular and mainland individuals in A. olivacea, being the cranium size of this species significantly bigger on islands. Indeed, specimens of A. olivacea from “Isla Wellington”, exhibited the higher increment in cranium size compared to any other mainland and insular site sampled for this species. In contrast, insular and mainland forms of O. longicaudatus did not show significant differences in cranial morphology. Conclusions We suggest that the patterns of morphological variation observed in these two small rodents along Patagonia, could be explained in terms of the historical biogeography of the region, and the different ecological features of the studied species.
dc.identifier.citationRevista Chilena de Historia Natural. 2020 Jul 14;93(1):6
dc.identifier.doi10.1186/s40693-020-00094-9
dc.identifier.urihttps://doi.org/10.1186/s40693-020-00094-9
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/33473
dc.identifier.wosidWOS:000548665700001
dc.issue.numeroNo. 6
dc.language.isoen
dc.pagina.final12
dc.pagina.inicio1
dc.revistaRevista Chilena de Historia Naturales_ES
dc.rightsacceso restringido
dc.rights.holderThe Author(s)
dc.subjectAbrothrix olivaceaes_ES
dc.subjectGeometric morphometricses_ES
dc.subjectLinear morphometricses_ES
dc.subjectOligoryzomys longicaudatuses_ES
dc.subject.ddc599.35
dc.subject.deweyBiologíaes_ES
dc.subject.ods15 Life on land
dc.subject.ods13 Climate action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.titleMorphological variation in two sigmodontine rodents along the mainland and the Fuegian archipelago in Chilean southern Patagoniaes_ES
dc.typeartículo
dc.volumenVol. 93
sipa.codpersvinculados198517
sipa.codpersvinculados1027812
sipa.codpersvinculados100250
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