title: Molecular assessment of the phylogeny and biogeography of a recently diversified endemic group of South American canids (Mammalia: Carnivora: Canidae).
abstract: To investigate the evolution and biogeography of an endemic group of South American foxes, we examined mitochondrial DNA control region sequences for 118 individuals belonging to all six extant species of the genus Lycalopex. Phylogenetic and molecular dating analyses supported the inference that this genus has undergone a very recent and rapid radiation, stemming from a common ancestor that lived ca. 1 million years ago. The Brazilian endemic L. vetulus was supported as the most basal species in this genus, whereas the most internal group is comprised by the recently diverged (ca. 350,000 years ago) Andean/Patagonian species L. griseus and L. culpaeus. We discuss the inferred phylogenetic relationships and divergence times in the context of the current geographic distributions of these species, and the likely effects of Pleistocene climatic changes on the biogeography of this group. Furthermore, a remarkable finding was the identification of multiple individuals classified as L. gymnocercus bearing mtDNA haplotypes clearly belonging to L. griseus, sampled in regions where the latter is not known to occur. At a minimum, this result implies the need to clarify the present-day geographic distribution of each of these fox species, while it may also indicate an ongoing hybridization process between them. Future testing of this hypothesis with in-depth analyses of these populations is thus a priority for understanding the history, evolutionary dynamics and present-day composition of this endemic Neotropical genus.
authors: Departamento de Química e Biologia, Centro de Educação, Ciências Exatas e Naturais (CECEN), Universidade Estadual do Maranhão (UEMA), São Luís, MA, Brazil.
authors: Ligia
authors: L
authors: Tchaicka
authors: Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
authors: Thales Renato Ochotorena de
authors: TR
authors: Freitas
authors: Departamento de Biologia, Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil.
authors: Alex
authors: A
authors: Bager
authors: Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca, Argentina.
authors: Stela Luengos
authors: SL
authors: Vidal
authors: Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Bahía Blanca, Argentina.
authors: Mauro
authors: M
authors: Lucherini
authors: Center for Advanced Studies in Ecology & Biodiversity (CASEB), Pontificia Universidad Catolica & Fundacion Biodiversitas, Santiago, Chile.
authors: Agustín
authors: A
authors: Iriarte
authors: Consejo Nacional de Investigaciones Científicas y Técnicas, and Wildlife Conservation Society-Argentina, Junín de los Andes, Neuquén, Argentina.
authors: Andres
authors: A
authors: Novaro
authors: Department of Zoology, Tel Aviv University, Israel.
authors: Eli
authors: E
authors: Geffen
authors: Laboratório de Biologia Genômica e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil.
authors: Fabricio Silva
authors: FS
authors: Garcez
authors: Smithsonian Conservation Biology Institute, Washington, DC, USA.
authors: Warren E
authors: WE
authors: Johnson
authors: Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, USA.
authors: Robert K
authors: RK
authors: Wayne
authors: Laboratório de Biologia Genômica e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil.|Instituto Pró-Carnívoros, Atibaia, SP, Brazil.
authors: Eduardo
authors: E
authors: Eizirik