Manioc : Portail | resultats 21 - 40 pour la recherche: Mahogany family

Reports from committees : eighteen volumes. Sugar and coffee planting. Session 18 november 1847 - 5 september 1848. Part. 1
Auteur(s) : Grande Bretagne. House of commons. Library
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Personal narrative of travels to the equinoctial regions of America, during the years 1799-1804 / by Alexander von Humboldt and Aimé Bonpland ; translated from the French of Alexander von Humboldt and edited by Thomasina Ross. Volume 2
Auteur(s) : Bonpland, Aimé (1773-1858) Humboldt, Alexander von (1769-1859)
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Emancipation in the West Indies : a six months's tour in Antigua, Barbadoes, and Jamaica, in the year 1837
Auteur(s) : Thome, James Armstrong (1813-1873) Kimball, Joseph Horace (1813-1838)
Auteurs secondaires : American Anti-Slavery Society
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Cuba population, history and resources 1907
Auteur(s) : Olmsted, Victor Hugo Gannett, Henry (1846-1914)
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The Life and voyages of Christopher Colombus ; together with the voyages of his companions (vol. 1)
Auteur(s) : Irving, Washington (1783-1859)
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Guiana : British, Dutch, and French
Auteur(s) : Rodway, James (1848-1926)
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The magic island
Auteur(s) : Seabrook, William Buehler (1886-1945)
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Les bois coloniaux : 28 figures
Auteur(s) : Lecomte, Henri (1856-1934)
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Phylogeography of a species complex of lowland Neotropical rain forest trees (Carapa, Meliaceae)
Auteur(s) : Scotti-Saintagne, Caroline Dick, Christopher W. Caron, Henri Vendramin, Giovanni G. Guichoux, Erwan Buonamici, Anna Duret, Caroline Sire, Pierre
Auteurs secondaires : Ecologie des forêts de Guyane (ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - AgroParisTech - Centre National de la Recherche Scientifique (CNRS) Department of Ecology and Evolutionary Biology ; University of Michigan [Ann Arbor] Biodiversité, Gènes et Communautés ; Institut National de Recherche Agronomique Laboratorio de Ecología de Plantas y Herbario QCA, Escuela de Ciencias Biológicas ; Pontificia Universidad Catolica del Ecuador Laboratório de Genética e Biologia Reprodutiva de Plantas ; Instituto Nacional de Pesquisas da Amazônia

Éditeur(s) : HAL CCSD Wiley
Résumé : [b]Aim[/b][br/] Many tropical tree species have poorly delimited taxonomic boundaries and contain undescribed or cryptic species. We examined the genetic structure of a species complex in the tree genus Carapa in the Neotropics in order to evaluate age, geographic patterns of diversity and evolutionary relationships, and to quantify levels of introgression among currently recognized species.[br/] [br/] [b]Location[/b][br/] Lowland moist forests in the Guiana Shield, the Central and Western Amazon Basin, Chocó and Central America.[br/] [br/] [b]Methods[/b][br/] Genetic structure was analysed using seven nuclear simple sequence repeats (nuSSR), five chloroplast SSRs (cpSSR), and two chloroplast DNA (cpDNA) intergenic sequences (trnH-psbA and trnC-ycf6). Bayesian clustering analysis of the SSR data was used to infer population genetic structure and to assign 324 samples to their most likely genetic cluster. Bayesian coalescence analyses were performed on the two cpDNA markers to estimate evolutionary relationships and divergence times.[br/] [br/] [b]Results[/b][br/] Two genetic clusters (nu_guianensis and nu_surinamensis) were detected, which correspond to the Neotropical species C. guianensis (sensu latu) and C. surinamensis. Fourteen cpDNA haplotypes clustered into six haplogroups distributed between the two nuclear genetic clusters. Divergence between the haplogroups was initiated in the Miocene, with some haplotype structure evolving as recently as the Pleistocene. The absence of complete lineage sorting between the nuclear and chloroplast genomes and the presence of hybrid individuals suggest that interspecific reproductive barriers are incomplete. NuSSR diversity was highest in C. guianensis and, within C. guianensis, cpDNA diversity was highest in the Central and Western Amazon Basin. Regional genetic differentiation was strong but did not conform to an isolation-by-distance process or exhibit a phylogeographical signal.[br/] [br/] [b]Main conclusions[/b][br/] The biogeographical history of Neotropical Carapa appears to have been influenced by events that took place during the Neogene. Our results point to an Amazonian centre of origin and diversification of Neotropical Carapa, with subsequent migration to the Pacific coast of South America and Central America. Gene flow apparently occurs among species, and introgression events are supported by inconsistencies between chloroplast and nuclear lineage sorting. The absence of phylogeographical structure may be a result of the ineffectiveness of geographical barriers among populations and of reproductive isolation mechanisms among incipient and cryptic species in this species complex.
ISSN: 0305-0270

hal-01032395
https://hal.archives-ouvertes.fr/hal-01032395
DOI : 10.1111/j.1365-2699.2011.02678.x

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