INSTITUTO DE DIVERSIDAD Y ECOLOGIA ANIMAL
Unidad Ejecutora - UE
Natural hybridization in lizards of the genus Tupinambis (Teiidae) in the southernmost contact zone of their distribution range
CABAÑA JUAN IMANOL; CHIARAVIGLIO MARGARITA; GARDENAL CRISTINA N; RIVERA PAULA C.
ANNALES ZOOLOGICI FENNICI
FINNISH ZOOLOGICAL BOTANICAL PUBLISHING BOARD
Lugar: Helsinki; Año: 2014 vol. 51 p. 340 - 340
Studies on the mechanisms of speciation and maintenance of lineages have paid great attention to hybridization between species because this process is considered an important source of variability and evolution. In the last years, the use of molecular markers has provided more detailed information on the distribution and magnitude of hybridization in natural populations. Here we present a phylogenetic analysis using mitochondrial and nuclear DNA markers in two closely related lizard species, Tupinambis merianae and T. rufescens, which are present in a continuous area including populations in allopatry and sympatry. Consensus trees obtained with the mitochondrial gene showed two well supported clades. Some specimens clustered with one of the species in the tree obtained with mitochondrial DNA and with the other species in the tree resulting from the analysis of a nuclear gene, demonstrating the occurrence of hybridization between these species. Hybrids individuals are from the area of sympatry, suggesting the existence of a hybrid zone in the contact area of the distribution ranges of both lizards, which corresponds to the ecotone between Dry Chaco and Espinal. This work presents the first evidence of natural hybridization within the genus Tupinambis.