trié(s) par (Pertinence décroissant(e), Titre croissant(e)) 

Centaurea corymbosa, a cliff-dwelling species tottering on the brink of extinction : A demographic and genetic study / Bruno Colas in Proceedings of the National Academy of Sciences of the United States of America, vol. 94, n°7 (Année 1997)

Public [article]  inProceedings of the National Academy of Sciences of the United States of America > vol. 94, n°7 (Année 1997) . - pp. 3471–3476 Titre : Centaurea corymbosa, a cliff-dwelling species tottering on the brink of extinction : A demographic and genetic study Auteurs : Bruno Colas, Auteur ; Isabelle Olivieri (1957-2016), Auteur ; Miquel Riba, Auteur Année de publication : 1997 Article en page(s) : pp. 3471–3476 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Centaurea corymbosa [Thèmes] Conservation [Thèmes] Plante à forte valeur patrimoniale Mots-clés : aire de répartition  diversité génétique  réintroduction d'espèces Résumé : "Centaurea corymbosa (Asteraceae) is endemic to a small area (≤3 km2), and <500 individuals reproduce in any given year. Nevertheless, enzyme polymorphism was found within and among the six local extant populations, the most distant at 2.3 km. Levels of gene flow among populations and seed and pollen dispersal data indicated very low dispersal capacity. Rarity of long distance dispersal events coupled with traits such as prolonged juvenile period, monocarpy, and self-incompatibility precludes the establishment of new populations and thus the evolution toward colonization ability through increased dispersal rate, polycarpy, or self-compatibility. The species thus appears to be trapped on an evolutionary dead-end toward extinction, even though, from a preliminary introduction experiment, we conclude that several nearby unoccupied sites would be suitable for the species." (source : auteurs) Type de publication : périodique Référence biblio : Colas B., Olivieri I., Riba M., 1997 - Centaurea corymbosa, a cliff-dwelling species tottering on the brink of extinction : A demographic and genetic study. Proceedings of the National Academy of Sciences of the United States of America, 94 (7) : 3471–3476. ID PMB : 72252 DOI : 10.1073/pnas.94.7.3471 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72252 [article]

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Multilocus genetic structure at contrasted spatial scales of the endangered water fern Marsilea strigosa Willd. (Marsileaceae, Pteridophyta) / Renaud Vitalis in American Journal of Botany, vol. 89, n°7 (Année 2002)

Public [article]  inAmerican Journal of Botany > vol. 89, n°7 (Année 2002) . - pp. 1142-55 Titre : Multilocus genetic structure at contrasted spatial scales of the endangered water fern Marsilea strigosa Willd. (Marsileaceae, Pteridophyta) Auteurs : Renaud Vitalis, Auteur ; Miquel Riba, Auteur ; Bruno Colas, Auteur ; Patrick Grillas, Auteur ; Isabelle Olivieri (1957-2016), Auteur Année de publication : 2002 Article en page(s) : pp. 1142-55 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Marsilea strigosa [Thèmes] Conservation [Thèmes] Plante à forte valeur patrimoniale [Thèmes] Reproduction Mots-clés : diversité Génétique Résumé : "Marsilea strigosa (Marsileaceae, Pterydophyta) is a rare water fern found in the Mediterranean basin, in temporary flooded habitats only. We analyzed the level and the distribution of genetic variation at seven microsatellite loci, both at the Mediterranean scale and at a narrower scale within a highly fragmented French metapopulation. Genetic diversity among individuals within each pond suggests that M. strigosa reproduces predominantly through selfing. The very high population differentiation at the Mediterranean scale indicates that gene flow (if any) is highly restricted. Similar differentiation is also found at the scale of a single metapopulation. The distribution of multilocus genotypes suggests that the genetic variation in this species is maintained mainly through the interplay of mutation and low recombination." (source : auteurs) Type de publication : périodique Référence biblio : Vitalis R., Riba M., Colas B., Grillas P., Olivieri I., 2002 - Multilocus genetic structure at contrasted spatial scales of the endangered water fern Marsilea strigosa Willd. (Marsileaceae, Pteridophyta). American Journal of Botany, 89 (7) : 1142-55. ID PMB : 72259 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=72259 [article]

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