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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)
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-Thèmes] Distribution de la diversité génétique
[CBNPMP-Thèmes] Démographie, écologie des populations (dynamique des populations, démécologie)
[CBNPMP-Thèmes] Structures des populations végétales
[CBNPMP-Thèmes] Incidence des activités agricoles
[CBNPMP-Géographique] AlpesMots-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, M. 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. , .Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 12530 8400 Thèse et mémoire Centre de documentation Bibliothèque Consultable 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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Titre : Genetic structure of the endangered perennial plant Eryngium alpinum (Apiaceae) in an Alpine valley Type de document : Électronique Auteurs : Myriam Gaudeul (1976-) ; Irène Till-Bottraud Année de publication : 2008 Article en page(s) : 667-677 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Généralités en amélioration des plantes et valorisation Mots-clés : Eryngium alpinum L. Résumé : We investigated the genetic structure of Eryngium alpinum (Apiaceae) in an Alpine valley where the plant occurs in patches of various sizes. In a conservation perspective, our goal was to determine whether the valley consists of one or several genetic units. Habitat fragmentation and previous observations of restricted pollen/seed dispersal suggested pronounced genetic structure, but gene dispersal often follows a leptokurtic distribution, which may lead to weak genetic structure. We used nine microsatellite loci and two nested sampling designs (50 x 50 m grid throughout the valley and 2 x 2 m grid in two 50 x 10 m quadrats). Within the overall valley, F-statistics and Bayesian approaches indicated high genetic homogeneity. This result might be explained by: (1) underestimation of long-distance pollen/seed dispersal by in situ experiments and (2) too recent fragmentation events to build up genetic structure. Spatial autocorrelation revealed isolation by distance on the overall valley but this pattern was much more pronounced in the 50 x 10 m quadrats sampled with a 2-m mesh. This was probably associated with limited primary seed dispersal, leading to the spatial clustering of half-sibs around maternal plants. We emphasize the interest of nested sampling designs and of combining several statistical tools. (C) 2008 The Linnean Society of London. Lien pérenne : DOI : 10.1111/j.1095-8312.2008.00958.x / HAL : halsde-00277918 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=140695
in Biological Journal of the Linnean Society > 93 (2008) . - 667-677Gaudeul, M., Till-Bottraud, I. 2008. Genetic structure of the endangered perennial plant Eryngium alpinum (Apiaceae) in an Alpine valley. Biological Journal of the Linnean Society, 93: 667-677.Documents numériques
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article (2008)URL 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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Titre : Low selfing rate in an endangered perennial plant, Eryngium alpinum L. (Apiaceae) Type de document : Électronique Auteurs : Myriam Gaudeul (1976-) ; Irène Till-Bottraud Année de publication : 2003 Article en page(s) : 716-723 Langues : Anglais (eng) Mots-clés : Eryngium alpinum L. Résumé : We investigated the reproductive ecology of an endangered alpine species, Eryngium alpinum L., to determine its selfing rate and to propose possible mechanisms that may shape its breeding system. Whereas pollinators' foraging behavior suggested a high potential for geitonogamy (70% of the flights occur within plants), microsatellite analyses of seed progenies demonstrated that plants are primarily outcrossing (outcrossing rate [tm] = 0.65, 0.96, and 1 in three populations). Given the relatively long pollen viability (at least 4-5 d) and the high number of simultaneously opened flowers on each plant, protandry is not sufficient to eliminate selfing. Second, controlled crosses demonstrated not only auto-fertility, but also partial self-incompatibility. Partial self-incompatibility is probably due to the competitive advantage of cross vs. self-pollen, and, together with protandry, could lead the species to selfing as a reproductive assurance. These results are encouraging for the maintenance of large populations. However, higher selfing was observed in a small population that could suffer inbreeding depression, as observed on experimentally selfed seeds. Thus, these populations should be carefully monitored. Finally, this study shows how molecular markers and field experiments may complement each other in our reaching a global understanding of mating patterns. Lien pérenne : DOI : 10.3732/ajb.90.5.716 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=140707
in American Journal of Botany > 90 (10) (10/2003) . - 716-723Gaudeul, M., Till-Bottraud, I. 2003. Low selfing rate in an endangered perennial plant, Eryngium alpinum L. (Apiaceae). American Journal of Botany, 90(10): 716-723.Documents numériques
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article (2003)URL A propos d'une station de "Reine des Alpes" Eryngium alpinum L. signalée dans la région d'Ainac-Lambert / Louis Borel (1958)
Titre : A propos d'une station de "Reine des Alpes" Eryngium alpinum L. signalée dans la région d'Ainac-Lambert Type de document : Tiré à part de revue Auteurs : Louis Borel ; André Lavagne (1932-) Année de publication : 1958 Importance : 119-132 Langues : Français (fre) Catégories : [CBNPMP-Géographique] Ainac-Lambert Mots-clés : Eryngium alpinum L. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=134913 Borel, L., Lavagne, A. 1958. A propos d'une station de "Reine des Alpes" Eryngium alpinum L. signalée dans la région d'Ainac-Lambert. Documents pour la carte de la végétation des Alpes, 3 : 119-132.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 22986 Lavagne A. Tiré à part Centre de documentation Tirés à part Consultable 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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Titre : Reproductive ecology of the endangered alpine species eryngium alpinum l. (apiaceae) : phenology, gene dispersal and reproductive success Type de document : Électronique Auteurs : Myriam Gaudeul (1976-) ; Irène Till-Bottraud Année de publication : 2004 Article en page(s) : 711-721 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Phénologie Mots-clés : Eryngium alpinum L. Résumé : Background and aims Eryngium alpinum (Apiaceae) is an endangered perennial, characteristic of the Alpine flora. Because the breeding system influences both demographic (reproductive success) and genetic (inbreeding depression, evolutionary potential) parameters that are crucial for population maintenance, the reproductive ecology of E. alpinum was investigated. Specifically, the aims of the study were (1) to determine the factors (resources and/or pollen) limiting plant fitness; and (2) to assess the potential for gene flow within a plant, within a patch of plants, and across a whole valley where the species is abundant. Methods Field experiments were performed at two sites in the Fournel valley, France, over three consecutive years. Studies included a phenological survey, observations of pollinators (visitation rates and flight distances), dispersal of a fluorescent powder used as a pollen analogue, the use of seed traps, determination of the pollen/ovule ratio, and an experiment to test whether seed production is limited by pollen and/or by resources. Key resultsE. alpinum is pollinated by generalist pollinators, visitation rates are very high and seed set is resource‐ rather than pollen‐limited. The short flights of honeybees indicate a high potential for geitonogamy, and low pollen and seed dispersals suggest strong genetic structure over short distances. These results are interpreted in the light of previous molecular markers studies, which, in contrast, showed complete outcrossing and high genetic homogeneity. Conclusions. The study highlights the usefulness of adopting several complementary approaches to understanding the dynamic processes at work in natural populations, and the conservation implications for E. alpinum are emphasized. Although the studied populations do not seem threatened in the near future, long‐term monitoring appears necessary to assess the impact of habitat fragmentation. Moreover, this study provides useful baseline data for future investigations in smaller and more isolated populations. Lien pérenne : DOI : 10.1093/aob/mch098 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=140705
in Annals of Botany > 93 (2004) . - 711-721Gaudeul, M., Till-Bottraud, I. 2004. Reproductive ecology of the endangered alpine species eryngium alpinum l. (apiaceae) : phenology, gene dispersal and reproductive success. Annals of Botany, 93: 711-721.Documents numériques
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Article (2004)URL