dorsal/arxiv
View SchemaInt\'er\^ets et limites de l'approche mol\'eculaire pour aborder la biog\'eographie et la sp\'eciation : l'exemple de quelques Mammif\`eres d'Afrique tropicale
| Authors | Sophie Quérouil |
|---|---|
| Categories | |
| ArXiv ID | q-bio/0703052 |
| URL | https://arxiv.org/abs/q-bio/0703052 |
| Journal | Bulletin de la soci\'et\'e zoologique de France 127 (2002) 359-370 |
Abstract
We attempted to test biogeographic hypotheses proposed for the evolution of tropical faunas using mitochondrial DNA sequences of selected African mammalian taxa (Insectivora, Rodentia and Primates). 1/ we constructed a molecular phylogeny of taxa in order to ascertain their monophyly and calibrate a molecular clock; 2/ we analysed and compared the phylogeographic patterns of five forest-dwelling taxa; 3/ we evaluated the evolutionary processes potentially involved in the speciation of cercopithecine Primates. Phylogenetic results confirm that gene history is not necessarily the same as organism history. Phylogeographic analyses reveal distinct patterns for each model species, suggesting differences in initial distributions or different responses to the same events. They indicate a role of Plio-Pleistocene vicariance events in the intra-specific diversification of small mammals. Thus, genetic divergence would be much older than the last glacial cycles. In cercopithecine Primates, speciation would have been predominantly allopatric and driven by Miocene and Pliocene vicariance events. Altogether, results give support to the refuge hypothesis, without excluding the riverine barrier nor the paleogrographic ones. They emphasize the role of paleo-ecological changes in generating diversity and of the main riverine barriers in shaping the present distribution of that diversity.
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"abstract": "We attempted to test biogeographic hypotheses proposed for the evolution of\ntropical faunas using mitochondrial DNA sequences of selected African mammalian\ntaxa (Insectivora, Rodentia and Primates). 1/ we constructed a molecular\nphylogeny of taxa in order to ascertain their monophyly and calibrate a\nmolecular clock; 2/ we analysed and compared the phylogeographic patterns of\nfive forest-dwelling taxa; 3/ we evaluated the evolutionary processes\npotentially involved in the speciation of cercopithecine Primates. Phylogenetic\nresults confirm that gene history is not necessarily the same as organism\nhistory. Phylogeographic analyses reveal distinct patterns for each model\nspecies, suggesting differences in initial distributions or different responses\nto the same events. They indicate a role of Plio-Pleistocene vicariance events\nin the intra-specific diversification of small mammals. Thus, genetic\ndivergence would be much older than the last glacial cycles. In cercopithecine\nPrimates, speciation would have been predominantly allopatric and driven by\nMiocene and Pliocene vicariance events. Altogether, results give support to the\nrefuge hypothesis, without excluding the riverine barrier nor the\npaleogrographic ones. They emphasize the role of paleo-ecological changes in\ngenerating diversity and of the main riverine barriers in shaping the present\ndistribution of that diversity.",
"arxiv_id": "q-bio/0703052",
"authors": [
"Sophie Qu\u00e9rouil"
],
"categories": [
"q-bio.PE"
],
"journal_ref": "Bulletin de la soci\\\u0027et\\\u0027e zoologique de France 127 (2002) 359-370",
"title": "Int\\\u0027er\\^ets et limites de l\u0027approche mol\\\u0027eculaire pour aborder la biog\\\u0027eographie et la sp\\\u0027eciation : l\u0027exemple de quelques Mammif\\`eres d\u0027Afrique tropicale",
"url": "https://arxiv.org/abs/q-bio/0703052"
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