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Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga

Background: Phylogeographic research has advanced in South America, with increasing efforts on taxa from the dry diagonal biomes. However, the diversification of endemic fauna from the semiarid Caatinga biome in northeastern Brazil is still poorly known. Here we targeted saxicolous lizards of the Tr...

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Main Authors: Werneck, Fernanda de Pinho, Leite, Rafael N., Geurgas, Silvia R., Rodrigues, Miguel Trefaut
Format: Artigo
Language: Inglês
Published: BioMed Central 2017
Subjects:
Caatinga
Lagarto
Árvores
São Francisco, Rio
Online Access: http://repositorio.unb.br/handle/10482/23856
https://dx.doi.org/10.1186/s12862-015-0368-3
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spelling ir-10482-238562021-10-14T14:37:03Z Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga Werneck, Fernanda de Pinho Leite, Rafael N. Geurgas, Silvia R. Rodrigues, Miguel Trefaut Caatinga Lagarto Árvores São Francisco, Rio Background: Phylogeographic research has advanced in South America, with increasing efforts on taxa from the dry diagonal biomes. However, the diversification of endemic fauna from the semiarid Caatinga biome in northeastern Brazil is still poorly known. Here we targeted saxicolous lizards of the Tropidurus semitaeniatus species group to better understand the evolutionary history of these endemic taxa and the Caatinga. We estimated a time-calibrated phylogeny for the species group based on two mitochondrial and two nuclear genes and jointly estimated the species limits and species tree within the group. We also devoted a denser phylogeographic sampling of the T. semitaeniatus complex to explore migration patterns, and the spatiotemporal diffusion history to verify a possible role of the São Francisco River as a promoter of differentiation in this saxicolous group of lizards. Results: Phylogenetic analysis detected high cryptic genetic diversity, occurrence of unique microendemic lineages associated with older highlands, and a speciation history that took place during the Pliocene-Pleistocene transition. Species delimitation detected five evolutionary entities within the T. semitaeniatus species group, albeit with low support. Thus, additional data are needed for a more accurate definition of species limits and interspecific relationships within this group. Spatiotemporal analyses reconstructed the geographic origin of the T. semitaeniatus species complex to be located north of the present-day course of the São Francisco River, followed by dispersal that expanded its distribution towards the northwest and south. Gene flow estimates showed higher migration rates into the lineages located north of the São Francisco River. Conclusions: The phylogenetic and population structures are intrinsically associated with stable rock surfaces and landscape rearrangements, such as the establishment of drainage basins located to the northern and southern distribution ranges. The T. semitaeniatus complex preserved high genetic diversity during range expansion, possibly as a result of frequent long-distance dispersal events. Our results indicate that both the current course of the São Francisco River and its paleo-courses had an important role in promoting diversification of the Caatinga endemic T. semitaeniatus species group. 2017-07-19T16:37:35Z 2017-07-19T16:37:35Z 2015-05-23 Artigo WERNECK, Fernanda de Pinho et al. Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga. BMC Evolutionary Biology, v. 15, Article 94, 23 mai. 2015. Disponível em: <https://bmcevolbiol.biomedcentral.com/articles/10.1186/s12862-015-0368-3>. Acesso em: 21 jun. 2017. doi: https://bmcevolbiol.biomedcentral.com/articles/10.1186/s12862-015-0368-3. http://repositorio.unb.br/handle/10482/23856 https://dx.doi.org/10.1186/s12862-015-0368-3 Inglês Acesso Aberto © 2015 Werneck et al.; licensee BioMed Central. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. application/pdf BioMed Central
institution REPOSITORIO UNB
collection REPOSITORIO UNB
language Inglês
topic Caatinga
Lagarto
Árvores
São Francisco, Rio
spellingShingle Caatinga
Lagarto
Árvores
São Francisco, Rio
Werneck, Fernanda de Pinho
Leite, Rafael N.
Geurgas, Silvia R.
Rodrigues, Miguel Trefaut
Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga
description Background: Phylogeographic research has advanced in South America, with increasing efforts on taxa from the dry diagonal biomes. However, the diversification of endemic fauna from the semiarid Caatinga biome in northeastern Brazil is still poorly known. Here we targeted saxicolous lizards of the Tropidurus semitaeniatus species group to better understand the evolutionary history of these endemic taxa and the Caatinga. We estimated a time-calibrated phylogeny for the species group based on two mitochondrial and two nuclear genes and jointly estimated the species limits and species tree within the group. We also devoted a denser phylogeographic sampling of the T. semitaeniatus complex to explore migration patterns, and the spatiotemporal diffusion history to verify a possible role of the São Francisco River as a promoter of differentiation in this saxicolous group of lizards. Results: Phylogenetic analysis detected high cryptic genetic diversity, occurrence of unique microendemic lineages associated with older highlands, and a speciation history that took place during the Pliocene-Pleistocene transition. Species delimitation detected five evolutionary entities within the T. semitaeniatus species group, albeit with low support. Thus, additional data are needed for a more accurate definition of species limits and interspecific relationships within this group. Spatiotemporal analyses reconstructed the geographic origin of the T. semitaeniatus species complex to be located north of the present-day course of the São Francisco River, followed by dispersal that expanded its distribution towards the northwest and south. Gene flow estimates showed higher migration rates into the lineages located north of the São Francisco River. Conclusions: The phylogenetic and population structures are intrinsically associated with stable rock surfaces and landscape rearrangements, such as the establishment of drainage basins located to the northern and southern distribution ranges. The T. semitaeniatus complex preserved high genetic diversity during range expansion, possibly as a result of frequent long-distance dispersal events. Our results indicate that both the current course of the São Francisco River and its paleo-courses had an important role in promoting diversification of the Caatinga endemic T. semitaeniatus species group.
format Artigo
author Werneck, Fernanda de Pinho
Leite, Rafael N.
Geurgas, Silvia R.
Rodrigues, Miguel Trefaut
author_sort Werneck, Fernanda de Pinho
title Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga
title_short Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga
title_full Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga
title_fullStr Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga
title_full_unstemmed Biogeographic history and cryptic diversity of saxicolous Tropiduridae lizards endemic to the semiarid Caatinga
title_sort biogeographic history and cryptic diversity of saxicolous tropiduridae lizards endemic to the semiarid caatinga
publisher BioMed Central
publishDate 2017
url http://repositorio.unb.br/handle/10482/23856
https://dx.doi.org/10.1186/s12862-015-0368-3
_version_ 1713692109953826816
score 13.657419

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