Arid
DOI10.1016/j.ympev.2012.05.007
Phylogeny of North African Agama lizards (Reptilia: Agamidae) and the role of the Sahara desert in vertebrate speciation
Goncalves, Duarte V.1,2; Brito, Jose C.1,2; Crochet, Pierre-Andre3; Geniez, Philippe4; Padial, Jose M.5; James Harris, D.1,2
通讯作者Brito, Jose C.
来源期刊MOLECULAR PHYLOGENETICS AND EVOLUTION
ISSN1055-7903
EISSN1095-9513
出版年2012
卷号64期号:3页码:582-591
英文摘要

The origin of Saharan biodiversity is poorly understood, in part because the geological and paleoclimatic events that presumably shaped species diversity are still controversial, but also because few studies have explored causal explanations for the origin of Saharan diversity using a phylogenetic framework. Here, we use mtDNA (16S and ND4 genes) and nDNA (MC1R and CMOS genes) to infer the relationships and biogeographic history of North African agamas (genus Agama). Agamas are conspicuous, diverse and abundant African lizards that also occur in the Saharan xeric and mesic environments. Our results revealed the presence of three Agama lineages in North Africa: one Afrotropical, one Sahelo-Saharan, and one broadly distributed in North Africa and mainly Saharan. Southern Mauritania contains the highest known diversity, with all three lineages present. Results suggest that agamas colonized the Sahara twice, but only one lineage was able to radiate and diversify there. Species in the Saharan lineage are mostly allopatric, and their splitting, genetic diversity and distribution are greatly explained by mountain ranges. One species in this lineage has colonized the Mediterranean climatic zone (A. impalearis), and another one the Sahel savannah (A. boueti). The other lineage to colonize the Sahara corresponds to A boulengeri, an eminently Sahelian species that also inhabits Saharan mountain ranges in Mauritania and Mali. Phylogenetic analyses indicate that allopatric montane populations within some currently recognized species are also genetically divergent. Our study therefore concludes that vicariant speciation is a leading motor of species diversification in the area: Inside the Sahara, associated to mountain-ranges isolated by dune seas and bare plains; outside, associated to less harsh climates to the North and South. Paleoclimatic oscillations are suggested as causal explanations of the vicariant distribution and origin of species. Agamas are thought to have colonized northern Africa during wet periods, with subsequent dry periods fragmenting species distribution and leading to allopatric populations associated to milder and wetter climates in the Mediterranean, Sahel, and in Saharan mountains, in an island-model fashion. Finally, our results support the synonymization of A. castroviejoi with A. boueti, the reciprocal monophyly of all other North African agamas, and suggest one candidate species within A. boulengeri. (C) 2012 Elsevier Inc. All rights reserved.


英文关键词Biogeography Vicariance Candidate species Taxonomy Climate shifts Mountains
类型Article
语种英语
国家Portugal ; France ; USA
收录类别SCI-E
WOS记录号WOS:000306621400016
WOS关键词MITOCHONDRIAL-DNA SEQUENCES ; SOUTHERN ROCK AGAMA ; SAURIA AGAMIDAE ; WEST-AFRICA ; HAPLOTYPE RECONSTRUCTION ; SQUAMATA AGAMIDAE ; MTDNA SEQUENCES ; SPECIES LEVEL ; MIXED MODELS ; NUCLEAR-DNA
WOS类目Biochemistry & Molecular Biology ; Evolutionary Biology ; Genetics & Heredity
WOS研究方向Biochemistry & Molecular Biology ; Evolutionary Biology ; Genetics & Heredity
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174098
作者单位1.Univ Porto, Inst Ciencias Agr Vairao, Ctr Invest Biodiversidade & Recursos Genet, CIBIO, P-4485661 Vairao, Portugal;
2.Univ Porto, Fac Ciencias, Dept Biol, P-4169007 Oporto, Portugal;
3.Ctr Ecol Fonct & Evolut, CNRS UMR 5175, F-34293 Montpellier 5, France;
4.Ctr Ecol Fonct & Evolut, EPHE UMR 5175, F-34293 Montpellier 5, France;
5.Amer Museum Nat Hist, Div Vertebrate Zool Herpetol, New York, NY 10024 USA
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Goncalves, Duarte V.,Brito, Jose C.,Crochet, Pierre-Andre,et al. Phylogeny of North African Agama lizards (Reptilia: Agamidae) and the role of the Sahara desert in vertebrate speciation[J]. French National Research Institute for Sustainable Development,2012,64(3):582-591.
APA Goncalves, Duarte V.,Brito, Jose C.,Crochet, Pierre-Andre,Geniez, Philippe,Padial, Jose M.,&James Harris, D..(2012).Phylogeny of North African Agama lizards (Reptilia: Agamidae) and the role of the Sahara desert in vertebrate speciation.MOLECULAR PHYLOGENETICS AND EVOLUTION,64(3),582-591.
MLA Goncalves, Duarte V.,et al."Phylogeny of North African Agama lizards (Reptilia: Agamidae) and the role of the Sahara desert in vertebrate speciation".MOLECULAR PHYLOGENETICS AND EVOLUTION 64.3(2012):582-591.
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