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Title: The evolutionary history of Lygodactylus lizards in the South American open diagonal
Authors: Lanna, Flávia Mól
Werneck, F. P.
Gehara, Marcelo C.M.
Fonseca, Emanuel M.
Colli, Guarino R.
Sites, Jack Walter
Rodrigues, Miguel Trefaut
Garda, Adrian Antonio
Keywords: Animals
Bayes Theorem
Genetic Variation
South America
Species Difference
Statistical Model
Time Factor
Bayes Theorem
Biological Evolution
Genetic Variation
Likelihood Functions
South America
Species Specificity
Time Factors
Issue Date: 2018
metadata.dc.publisher.journal: Molecular Phylogenetics and Evolution
metadata.dc.relation.ispartof: Volume 127, Pags. 638-645
Abstract: The Pleistocenic Arc Hypothesis (PAH) posits that South American Seasonally Dry Tropical Forests (SDTF) were interconnected during Pleistocene glacial periods, enabling the expansion of species ranges that were subsequently fragmented in interglacial periods, promoting speciation. The lizard genus Lygodactylus occurs in Africa, Madagascar, and South America. Compared to the high diversity of African Lygodactylus, only two species are known to occur in South America, L. klugei and L. wetzeli, distributed in SDTFs and the Chaco, respectively. We use a phylogenetic approach based on mitochondrial (ND2) and nuclear (RAG-1) markers covering the known range of South American Lygodactylus to investigate (i) if they are monophyletic relative to their African congeners, (ii) if their divergence is congruent with the fragmentation of the PAH, and (iii) if cryptic diversity exists within currently recognized species. Maximum likelihood and Bayesian phylogenetic analyses recovered a well-supported monophyletic South American Lygodactylus, presumably resulting from a single trans-Atlantic dispersal event 29 Mya. Species delimitation analyses supported the existence of five putative species, three of them undescribed. Divergence times among L. klugei and the three putative undescribed species, all endemic to the SDTFs, are not congruent with the fragmentation of the PAH. However, fragmentation of the once broader and continuous SDTFs likely influenced the divergence of L. wetzeli in the Chaco and Lygodactylus sp. 3 (in a SDTF enclave in the Cerrado). © 2018 Elsevier Inc.
metadata.dc.identifier.doi: 10.1016/j.ympev.2018.06.010
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