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Complémentarité 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)

Public Citation 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 : [CBNPMP-Thématique] Distribution de la diversité génétique [CBNPMP-Thématique] Démographie, écologie des populations (dynamique des populations, démécologie) [CBNPMP-Thématique] Structures des populations végétales [CBNPMP-Thématique] Incidence des activités agricoles [CBNPMP-Géographique] Alpes Mots-clés : Eryngium alpinum L. Note de contenu : Thèse de 3ème cycle à l'Université Paris XI à Orsay Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=78021 Gaudeul, Myriam (1976-), Université Paris-Sud (1970-2019) , 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. , .

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
12530	8400	Thèse et mémoire	Centre de documentation	Bibliothèque	Consultable

Disjunct distribution of Hypericum nummularium L. (Hypericaceae): molecular data suggest bidirectional colonization from a single refugium rather than survival in distinct refugia / Myriam Gaudeul in Biological Journal of the Linnean Society, 87 (2006) 

Public Citation [article]  inBiological Journal of the Linnean Society > 87 (2006) . - 437–447 Titre : Disjunct distribution of Hypericum nummularium L. (Hypericaceae): molecular data suggest bidirectional colonization from a single refugium rather than survival in distinct refugia Type de document : Électronique Auteurs : Myriam Gaudeul (1976-) Année de publication : 2006 Article en page(s) : 437–447 Langues : Anglais (eng) Résumé : Hypericum nummularium has a strongly disjunct, bi-areal distribution in Europe: it is abundant in the Pyrenees and grows in a very restricted part of the Alps, more than 1000 km away. My aim was to estimate the genetic divergence between these areas and to identify the factors responsible for the disjunction: glacial relicts, bidirectional colonization from a common refugium, long-distance dispersal and/or human introduction? Internal transcribed spacers (ITS) sequencing (680 bp) and amplified fragment length polymorphism (AFLP) fingerprinting (104 polymorphic markers) showed very low differentiation between populations in the Alps and the Pyrenees, indicating that H. nummularium probably survived in a single refugium. Moreover, levels of genetic diversity were similar in the two areas, making human introduction and long-distance dispersal unlikely. Thus, the species probably survived in one refugium, subsequently colonizing both areas more or less simultaneously. The comparison of genetic and geographical distances suggested a step by step migration in the Alps (isolation by distance), whereas random dispersal events were more likely in the Pyrenees. Finally, I discuss possible causes for the restricted distribution area of H. nummularium in the Alps (e.g. unsuitable habitat, low dispersal capacities) and conclude that strong human disturbance is probably the major limit to the expansion of the species in this region. Lien pérenne : DOI : 10.1111/j.1095-8312.2006.00583.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=140703 Gaudeul, Myriam (1976-) 2006 Disjunct distribution of Hypericum nummularium L. (Hypericaceae): molecular data suggest bidirectional colonization from a single refugium rather than survival in distinct refugia. Biological Journal of the Linnean Society, 87: 437–447.

Documents numériques

Consultable article (2006) URL

Ecological differentiation of Mediterranean endemic plants / John D. Thompson in Taxon, 54 (4) (2005) 

Public Citation [article]  inTaxon > 54 (4) (2005) . - 967-976 Titre : Ecological differentiation of Mediterranean endemic plants Type de document : Électronique Auteurs : John D. Thompson (1959-) ; Sébastien Lavergne (1976-) ; Laurence Affre (1969-) ; Myriam Gaudeul (1976-) ; Max Debussche (1948-) Année de publication : 2005 Article en page(s) : 967-976 Langues : Anglais (eng) Résumé : A striking feature of the Mediterranean flora concerns the high rates of narrow endemism within many regions. The prevailing paradigm for the evolution of such endemism relies on an important role of geographic isolation and allopatric speciation. Until recently there has been little work on the precise ecological differences among endemic plants and their congeners in the Mediterranean region and the potential role of ecological specialisation in isolation and speciation. This paper has two objectives. First, we evaluate general ecological differences among endemic and widespread congeners in the flora of the western Mediterranean. The results and review of the literature attest to consistent patterns of ecological differentiation among endemic species and their more widespread congeners. Second, we present results of a detailed study of morphological, molecular and ecological differentiation in a group of spring-flowering Mediterranean Cyclamen species. This study illustrates how differentiation in geographically peripheral and ecologically marginal populations may contribute to the diversification of endemic species whose contemporary distributions are disjunct from con-generic species. Lien pérenne : DOI : 10.2307/25065481 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=140704 Thompson, John D. (1959-), Lavergne, Sébastien (1976-), Affre, Laurence (1969-), Gaudeul, Myriam (1976-), Debussche, Max (1948-) 2005 Ecological differentiation of Mediterranean endemic plants. Taxon, 54(4): 967-976.

Documents numériques

Consultable article (2005) URL

Genetic diversity and differentiation in Eryngium alpinum L. (Apiaceae): comparison of AFLP and microsatellite markers / Myriam Gaudeul in Heredity, 92 (2004) 

Public Citation [article]  inHeredity > 92 (2004) . - 508–518 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. Lien pérenne : DOI : 10.1038/sj.hdy.6800443 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=140706 Gaudeul, Myriam (1976-), Till-Bottraud, Irène, Manel, Stéphanie 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) URL

Genetic diversity in an endangered alpine plant, Eryngium alpinum L. (Apiaceae), inferred from amplified fragment length polymorphism markers / Myriam Gaudeul in Molecular ecology, 9 (2000)

Public Citation [article]  inMolecular ecology > 9 (2000) . - 1625-1637 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. Lien pérenne : DOI : 10.1046/j.1365-294x.2000.01063.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148157 Gaudeul, Myriam (1976-), Taberlet, Pierre, Till-Bottraud, Irène 2000 Genetic diversity in an endangered alpine plant, Eryngium alpinum L. (Apiaceae), inferred from amplified fragment length polymorphism markers. Molecular ecology, 9: 1625-1637.

Genetic structure of the endangered perennial plant Eryngium alpinum (Apiaceae) in an Alpine valley / Myriam Gaudeul in Biological Journal of the Linnean Society, 93 (2008) 

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Intraspecific genetic diversity in alpine plants / Irène Till-Bottraud (2002)

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Landscape structure, clonal propagation and genetic diversity in Scandinavian populations of Arabidopsis lyrata (Brassicaceae) / Myriam Gaudeul in American Journal of Botany, 94 (2007) 

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Low selfing rate in an endangered perennial plant, Eryngium alpinum L. (Apiaceae) / Myriam Gaudeul in American Journal of Botany, 90 (10) (10/2003) 

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Reproductive ecology of the endangered alpine species eryngium alpinum l. (apiaceae) : phenology, gene dispersal and reproductive success / Myriam Gaudeul in Annals of Botany, 93 (2004) 

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