A cytogenetic, molecular genetic and morphological study of Patagonian chinchilla mice Euneomys (Rodentia, Cricetidae) in the Southern Central Andes

• Autorzy: Ojeda A. A. , Novillo A. , Ovejero R. J. A. , Cuello P. A. , Lanzone C. , Borisenko A. V. , Braun J. K. , Mares M. A. , Ojeda R. A.
• Języki publikacji: EN

Abstrakty

EN

Euneomys is a genus of sigmodontine rodent endemic to South America, distributed along the Andes of Argentina and Chile and in adjoining Patagonian steppe. Here, we studied specimens of Euneomys from different localities in the Central Andes, Mendoza Province, Argentina. Karyotypic analyses confirm the presence of a new karyomorph of Euneomys chinchilloides, the form 2n = 34, FN = 62–64. This new karyomorph differs from the form E. chinchilloides with 2n = 36, FN = 64–66. The chromosome complement with 2n = 36 has an extra pair of small acro-telocentric chromosomes that is not present in individuals with 2n = 34. We also found small differences in molecular analyses with the mitochondrial COI gene. We recovered two monophyletic clades, one with specimens with 2n = 34 and the other one with specimens with 2n = 36, which are separated by a range of 0.7 to 1.2 % sequence divergence. Individuals from the two clades also show some morphological differences. Significant difference in the length of ear was found between the specimens with 2n = 34 and 36, and qualitative differences in the shape of the incisive foramen, the palate, and the palatine fossa were observed. The modification on fundamental and diploid number that we found between the two karyomorphs of E. chinchilloides can be the result of tandem chromosome fusion; such rearrangements are strongly negatively heterotic and lead to reproductive isolation between differentiated populations. Thus, the integrated cytogenetic, molecular, and morphologic analyses show concordant differentiation between the two karyomorph types of the uncommon E. chinchilloides from the Southern Central Andes of Argentina. The evidence presented here might reflect a recent and/or incipient allopatric speciation event. Further investigations are needed to elucidate the taxonomic and distributional status of species of Euneomys.

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 2015
• Tom: 60
• Numer: 1
• Opis fizyczny: p.61-69,fig.,ref.

Twórcy

autor

Ojeda A. A.

• Grupo de Investigaciones de la Biodiversidad (GIB), Instituto Argentino de Zonas Aridas (IADIZA), CONICET. Centro de Ciencia y Tecnica Mendoza (CCT Mendoza), Avenida Ruiz Leal s/n Parque CC 507, CP 5500 General San Martin, Mendoza, Argentina

autor

Novillo A.

• Grupo de Investigaciones de la Biodiversidad (GIB), Instituto Argentino de Zonas Aridas (IADIZA), CONICET. Centro de Ciencia y Tecnica Mendoza (CCT Mendoza), Avenida Ruiz Leal s/n Parque CC 507, CP 5500 General San Martin, Mendoza, Argentina

autor

Ovejero R. J. A.

• Grupo de Investigaciones de la Biodiversidad (GIB), Instituto Argentino de Zonas Aridas (IADIZA), CONICET. Centro de Ciencia y Tecnica Mendoza (CCT Mendoza), Avenida Ruiz Leal s/n Parque CC 507, CP 5500 General San Martin, Mendoza, Argentina

autor

Cuello P. A.

• Grupo de Investigaciones de la Biodiversidad (GIB), Instituto Argentino de Zonas Aridas (IADIZA), CONICET. Centro de Ciencia y Tecnica Mendoza (CCT Mendoza), Avenida Ruiz Leal s/n Parque CC 507, CP 5500 General San Martin, Mendoza, Argentina

autor

Lanzone C.

• Grupo de Investigaciones de la Biodiversidad (GIB), Instituto Argentino de Zonas Aridas (IADIZA), CONICET. Centro de Ciencia y Tecnica Mendoza (CCT Mendoza), Avenida Ruiz Leal s/n Parque CC 507, CP 5500 General San Martin, Mendoza, Argentina
• Laboratorio de Genetica Evolutiva, FCEQyN, IBS, UNaM-CONICET, Felix de Azara 1552, CPA N3300LQF, Posadas, Misiones, Argentina

autor

Borisenko A. V.

• Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, Canada

autor

Braun J. K.

• Sam Noble Oklahoma Museum of Natural History, University of Oklahoma, Norman, OK, USA

autor

Mares M. A.

• Sam Noble Oklahoma Museum of Natural History, University of Oklahoma, Norman, OK, USA

autor

Ojeda R. A.

• Grupo de Investigaciones de la Biodiversidad (GIB), Instituto Argentino de Zonas Aridas (IADIZA), CONICET. Centro de Ciencia y Tecnica Mendoza (CCT Mendoza), Avenida Ruiz Leal s/n Parque CC 507, CP 5500 General San Martin, Mendoza, Argentina

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DOI

10.1007/s13364-014-0200-2