Détail de l'auteur
Auteur Myriam Gaudeul (1976-) |
Documents disponibles écrits par cet auteur (6)
Affiner la rechercheComplémentarité des approches génétique, démographiques, et écologiques dans l'étude d'une espèce menacée : le cas d'Eryngium alpinum L, Chardon bleu des Alpes / Myriam Gaudeul (2002)
Titre : Complémentarité des approches génétique, démographiques, et écologiques dans l'étude d'une espèce menacée : le cas d'Eryngium alpinum L, Chardon bleu des Alpes Type de document : Imprimé Auteurs : Myriam Gaudeul (1976-) ; Université Paris-Sud (1970-2019) Année de publication : 2002 Langues : Français (fre) Catégories : [Thématique] Distribution de la diversité génétique
[Thématique] Démographie, écologie des populations (dynamique des populations, démécologie)
[Thématique] Structures des populations végétales
[Thématique] Incidence des activités agricoles
[Géographique] AlpesMots-clés : Eryngium alpinum L. Note de contenu : Thèse de 3ème cycle à l'Université Paris XI à Orsay Gaudeul, M., Université Paris-Sud, 2002 - Complémentarité des approches génétique, démographiques, et écologiques dans l'étude d'une espèce menacée : le cas d'Eryngium alpinum L, Chardon bleu des Alpes, [éditeur inconnu], [lieu de publication inconnu], [pas de pagination].Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 12530 8400 Thèse et mémoire Centre de documentation Bibliothèque Consultable Genetic diversity and differentiation in Eryngium alpinum L. (Apiaceae): comparison of AFLP and microsatellite markers / Myriam Gaudeul in Heredity, 92 (2004)
Titre : Genetic diversity and differentiation in Eryngium alpinum L. (Apiaceae): comparison of AFLP and microsatellite markers Type de document : Imprimé Auteurs : Myriam Gaudeul (1976-) ; Irène Till-Bottraud ; Stéphanie Manel Année de publication : 2004 Article en page(s) : 508–518 Langues : Anglais (eng) Mots-clés : Eryngium alpinum L., 1771 Eryngium alpinum L., 1753 Résumé : Genetic diversity and structure of 12 populations of Eryngium alpinum L. were investigated using 63 dominant amplified fragment length polymorphism (AFLP) and seven codominant microsatellite (48 alleles) markers. Within-population diversity estimates obtained with both markers were not correlated, but the microsatellite-based fixation index Fis was correlated with both AFLP diversity indices (number of polymorphic bands and Nei's expected heterozygosity). Only AFLP diversity indices increased with the size of populations, although they did not significantly differ among them (Kruskall–Wallis test). The discrepancy between AFLPs and microsatellites may be explained by a better coverage of the genome with numerous AFLPs, the higher mutation rates of microsatellites or the absence of significant difference among within-population diversity estimates. Genetic differentiation was higher with AFLPs (θ=0.40) than with microsatellites (θ=0.23), probably due to the higher polymorphism of microsatellites. Thus, we considered global qualitative patterns rather than absolute estimates to compare the performance of both types of markers. On a large geographic scale, the Mantel test and multivariate analysis showed that genetic patterns were more congruent with the spatial arrangement of populations when inferred from microsatellites than from AFLPs, suggesting higher homoplasy of AFLP markers. On a small spatial scale, AFLPs managed to discriminate individuals from neighboring populations whereas microsatellites did not (multivariate analysis), and the percentage of individuals correctly assigned to their population of origin was higher with AFLPs than with microsatellites. However, dominant AFLPs cannot be used to study heterozygosity-related topics. Thus, distinct molecular markers should be used depending on the biological question and the geographical scale investigated. Identifiant pérenne : DOI : 10.1038/sj.hdy.6800443
in Heredity > 92 (2004) . - 508–518Gaudeul, M., Till-Bottraud, I., Manel, S., 2004 - Genetic diversity and differentiation in Eryngium alpinum L. (Apiaceae): comparison of AFLP and microsatellite markers ; Heredity, 92 : 508–518.Documents numériques
Consultable
Article (2004)Adobe Acrobat PDF
Titre : Genetic diversity in an endangered alpine plant, Eryngium alpinum L. (Apiaceae), inferred from amplified fragment length polymorphism markers Type de document : Imprimé Auteurs : Myriam Gaudeul (1976-) ; Pierre Taberlet ; Irène Till-Bottraud Année de publication : 2000 Article en page(s) : 1625-1637 Langues : Anglais (eng) Mots-clés : Eryngium alpinum L., 1753 Résumé : Eryngium alpinum L. is an endangered species found across the European Alps. In order to obtain base-line data for the conservation of this species, we investigated levels of genetic diversity within and among 14 populations from the French Alps. We used the amplified fragment length polymorphism (AFLP) technique with three primer pairs and scored a total of 62 unambiguous, polymorphic markers in 327 individuals. Because AFLP markers are dominant, within-population genetic structure (e.g. FIS) could not be assessed. Analyses based either on the assumption of random-mating or on complete selfing lead to very similar results. Diversity levels within populations were relatively high (mean Nei's expected heterozygosity = 0.198; mean Shannon index = 0.283), and a positive correlation was detected between both genetic diversity measurements and population size (Spearman rank correlation: P = 0. 005 and P = 0.002, respectively). Moreover, FST values and exact tests of differentiation revealed high differentiation among populations (mean pairwise FST = 0.40), which appeared to be independent of geographical distance (nonsignificant Mantel test). Founder events during postglacial colonizations and/or bottlenecks are proposed to explain this high but random genetic differentiation. By contrast, we detected a pattern of isolation by distance within populations and valleys. Predominant local gene flow by pollen or seed is probably responsible for this pattern. Concerning the management of E. alpinum, the high genetic differentiation leads us to recommend the conservation of a maximum number of populations. This study demonstrates that AFLP markers enable a quick and reliable assessment of intraspecific genetic variability in conservation genetics. Identifiant pérenne : DOI : 10.1046/j.1365-294x.2000.01063.x
in Molecular Ecology > 9 (2000) . - 1625-1637Gaudeul, M., Taberlet, P., Till-Bottraud, I., 2000 - Genetic diversity in an endangered alpine plant, Eryngium alpinum L. (Apiaceae), inferred from amplified fragment length polymorphism markers ; Molecular Ecology, 9 : 1625-1637.Intraspecific genetic diversity in alpine plants / Irène Till-Bottraud (2002)
Titre : Intraspecific genetic diversity in alpine plants Type de document : Extrait d'ouvrage Auteurs : Irène Till-Bottraud ; Myriam Gaudeul (1976-) Année de publication : 2002 Importance : p. 23-34 Langues : Anglais (eng) Catégories : [Thématique] Biodiversité Till-Bottraud, I., Gaudeul, M., 2002 - Intraspecific genetic diversity in alpine plants ; in : Mountain biodiversity : a global assesment, 2002, p. 23-34.
Titre : Landscape structure, clonal propagation and genetic diversity in Scandinavian populations of Arabidopsis lyrata (Brassicaceae) Type de document : Électronique Auteurs : Myriam Gaudeul (1976-) ; Hans K. Stenøien ; Jon Ågren Année de publication : 2007 Article en page(s) : 1146-1155 Langues : Anglais (eng) Résumé : Colonization history, landscape structure, and environmental conditions may influence patterns of neutral genetic variation because of their effects on gene flow and reproductive mode. We compared variation at microsatellite loci within and among 26 Arabidopsis lyrata populations in two disjunct areas of its distribution in northern Europe (Norway and Sweden). The two areas probably share a common colonization history but differ in size (Norwegian range markedly larger than Swedish range), landscape structure (mountains vs. coast), and habitat conditions likely to affect patterns of gene flow and opportunities for sexual reproduction. Within-population genetic diversity was not related to latitude but was higher in Sweden than in Norway. Population differentiation was stronger among Norwegian than among Swedish populations (F(ST) = 0.23 vs. F(ST) = 0.18). The frequency of clonal propagation (proportion of identical multilocus genotypes) increased with decreasing population size, was higher in Norwegian than in Swedish populations, but was not related to altitude or substrate. Differences in genetic structure are discussed in relation to population characteristics and range size in the two areas. The results demonstrate that the possibility of clonal propagation should be considered when developing strategies for sampling and analyzing data in ecological and genetic studies of this emerging model species. Identifiant pérenne : DOI : 10.3732/ajb.94.7.1146
in American Journal of Botany > 94 (2007) . - 1146-1155Gaudeul, M., Stenøien, H.K., Ågren, J., 2007 - Landscape structure, clonal propagation and genetic diversity in Scandinavian populations of Arabidopsis lyrata (Brassicaceae) ; American Journal of Botany, 94 : 1146-1155.Documents numériques
Consultable
Article (2007)URL
