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Biologie Moléculaire et Phylogenèse des Lémuriformes (Primates de Madagascar)

Abstract : Molecular biology and Lemuriformes (Malagasy Primates) phylogeny In this study most of the species included in the Lemuridae (Eulemur, Hapalemur, Varecia), Indriidae (Indri, Propithecus, Avahi), Lepilemuridae, Cheirogaleidae (Cheirogaleus, Microcebus, Mirza) and Daubentonia are used, as well as a sub-fossile (Megaladapis edwardsi) and two Tupaia species. Mitochondrial sequences from a cytochrome b fragment (357 bp) and a 12S rRNA fragment (393 bp) are used to infer phylogenetic relationships between Lemuriformes families. Reconstructions are done using different methods (Neighbor-joining, Maximum Likelihood, Maximum Parsimony, Parsimony Ratchet, Quartet Puzzeling). The different trees are compared using LTR (Likelihood Test ratio) tests and 'four clusters' tests. The most 'credible' phylogenetic reconstruction is then: ((Cheirogaleidae, (Indriidae, (Lepilemuridae, Megaladapis)), ((Eulemur, Hapalemur), Varecia)), (Daubentonia, Tupaia)) The association between Daubentonia and Tupaia may indicate the existence of two distinct Lemuriformes colonisations, one conducting to the Daubentonia and the other to all other Malagasy Strepsirhini. The Megaladapis edwardsi sub-fossile appear to be grouped with le Lepilemuridae and together formed a clade how is the sister clade of the one including Indriidae. It was also possible to show that the sequences studied here have evolved under local molecular clocks. Divergence dates are estimated for the main groups. The oldest separation (near 60 million years) is found for the split between Daubentonia and Tupaia and the most recent (near 11 million years) is the one between Megaladapis and Lepilemuridae. For the other groups estimated divergence dates are between 48 and 29 million years.
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https://tel.archives-ouvertes.fr/tel-00002829
Contributor : Daniel Montagnon <>
Submitted on : Friday, May 16, 2003 - 9:04:40 AM
Last modification on : Thursday, April 23, 2020 - 2:26:30 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:05:38 PM

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  • HAL Id : tel-00002829, version 1

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Daniel Montagnon. Biologie Moléculaire et Phylogenèse des Lémuriformes (Primates de Madagascar). Biochimie [q-bio.BM]. Université Louis Pasteur - Strasbourg I, 2001. Français. ⟨tel-00002829⟩

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