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Auteur Richard Michalet |
Documents disponibles écrits par cet auteur (7)
Affiner la rechercheAcer negundo invasion along a successional gradient: Early direct facilitation by native pioneers and late indirect facilitation by conspecifics / Patrick Saccone in New Phytologist, 187 (3) (2010)
Titre : Acer negundo invasion along a successional gradient: Early direct facilitation by native pioneers and late indirect facilitation by conspecifics Type de document : Numérique Auteurs : Patrick Saccone (1976-) ; Jean-Philippe Pages ; Jacky Girel ; Jean-Jacques Brun ; Richard Michalet Année de publication : 2010 Article en page(s) : 13 p. Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Acer negundo L., 1753 Identifiant : DOI : 10.1111/j.1469-8137.2010.03289.x / HAL : hal-02667702
Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142781
in New Phytologist > 187 (3) (2010) . - 13 p.Saccone, Patrick (1976-), Pages, Jean-Philippe, Girel, Jacky, Brun, Jean-Jacques, Michalet, Richard 2010 Acer negundo invasion along a successional gradient: Early direct facilitation by native pioneers and late indirect facilitation by conspecifics. New Phytologist, 187(3): 13 p..Documents numériques
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Article (2010)URL
Titre : Changes in taxonomic and functional composition of subalpine plant communities in response to climate change under contrasting conditions of bedrock and snow cover duration Type de document : Numérique Auteurs : Richard Michalet ; Blaise Touzard ; Gilbert Billard ; Philippe Choler ; Gregory Loucougaray Année de publication : 2024 Article en page(s) : e13253 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Diversité botanique
[CBNPMP-Thématique] Changement climatique
[CBNPMP-Géographique] Alpes françaisesRésumé : Questions
We assessed interactions between climate change, bedrock types and snow cover duration on the trajectories of taxonomic and functional composition of subalpine plant communities. We predict (i) an increase in species richness on siliceous bedrock due to a reduced competition and a decrease in richness on calcareous bedrock due to increasing drought stress; (ii) decreasing snow cover duration should induce a higher shrub encroachment in hollows as compared to ridges; and (iii) increasing growing season temperature should induce taller sizes and more conservative growth traits, in particular in hollows.
Location
Subalpine belt of the Grandes Rousses mountain range, southwestern Alps (France).
Methods
189 vegetation plots were sampled in 1997 and 2017–2018. The duration of snow cover was assessed during two years in 1995–1997 and five functional traits were measured on 108 species in 2021. We performed multivariate analyses, quantified community-weighted means (CWM) of traits and used ANOVAs to detect responses to local-scale factors and changes in snow cover, temperature and precipitation since 1997 according to a nearby meteorological station.
Results
Overall, taxonomic composition weakly changed and changes were more dependent on the position of communities along the snow cover duration gradient than on their bedrock type. The abundance of drought-tolerant species increased at the border of hollows and there was, over all communities, a slight increase in the abundance of dwarf shrubs and tall herbaceous species, a strong decrease in short herbaceous species and, thus, an overall decrease in species richness. There were important overall changes in CWM of size traits, in particular leaf area which increased the most in hollows irrespective of bedrock types.
Conclusion
In this subalpine site the effects of decreasing snow cover duration overwhelmed the effects of bedrocks, which may explain the overall increase in competitive species and decrease in species richness.
Identifiant : DOI : 10.1111/jvs.13253 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155440
in Journal of vegetation science > 35 (2024) . - e13253Michalet, Richard, Touzard, Blaise, Billard, Gilbert, Choler, Philippe, Loucougaray, Gregory 2024 Changes in taxonomic and functional composition of subalpine plant communities in response to climate change under contrasting conditions of bedrock and snow cover duration. Journal of vegetation science, 35: e13253.Documents numériques
article (2024)URL
Titre : Les groupements à hautes herbes de l'étage subalpin des Monts Doré (Massif central français) Type de document : Imprimé Auteurs : Richard Michalet ; Thierry Philippe Année de publication : 1985 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Groupements végétaux, phytosociologie
[CBNPMP-Thématique] Inventaire des milieux, cartographies, relevés phyto-sociologiques
[CBNPMP-Thématique] Landes, fourrés et formation herbeuse naturelle et semi-naturelle
[CBNPMP-Thématique] Pelouses alpines et subalpines
[CBNPMP-Géographique] Monts dore
[CBNPMP-Géographique] Massif Central
[CBNPMP-Syntaxonomique] Festucion eskiae
[CBNPMP-Syntaxonomique] Calamagrostion
[CBNPMP-Syntaxonomique] Ligustico mutellinae-Luzulion desvauxiiPermalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=84964
in Colloques phytosociologiques > XII (1983-1984)Michalet, Richard, Philippe, Thierry 1985 Les groupements à hautes herbes de l'étage subalpin des Monts Doré (Massif central français). Colloques phytosociologiques, XII.Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité R2996B 8050 Revue Bureaux Natura 2000 Consultable R2996 8050 Revue Centre de documentation Bibliothèque Consultable
Titre : Invasive Acer negundo outperforms native species in non-limiting resource environments due to its higher phenotypic plasticity Type de document : Numérique Auteurs : Annabel J. Porté ; Laurent Jean Lamarque (1983-) ; Christopher Lortie ; Richard Michalet ; Sylvain Delzon (1977-) Année de publication : 2011 Article en page(s) : 28 p. Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Acer negundo L. Résumé : Background
To identify the determinants of invasiveness, comparisons of traits of invasive and native species are commonly performed. Invasiveness is generally linked to higher values of reproductive, physiological and growth-related traits of the invasives relative to the natives in the introduced range. Phenotypic plasticity of these traits has also been cited to increase the success of invasive species but has been little studied in invasive tree species. In a greenhouse experiment, we compared ecophysiological traits between an invasive species to Europe, Acer negundo, and early- and late-successional co-occurring native species, under different light, nutrient availability and disturbance regimes. We also compared species of the same species groups in situ, in riparian forests.
Results
Under non-limiting resources, A. negundo seedlings showed higher growth rates than the native species. However, A. negundo displayed equivalent or lower photosynthetic capacities and nitrogen content per unit leaf area compared to the native species; these findings were observed both on the seedlings in the greenhouse experiment and on adult trees in situ. These physiological traits were mostly conservative along the different light, nutrient and disturbance environments. Overall, under non-limiting light and nutrient conditions, specific leaf area and total leaf area of A. negundo were substantially larger. The invasive species presented a higher plasticity in allocation to foliage and therefore in growth with increasing nutrient and light availability relative to the native species.
Conclusions
The higher level of plasticity of the invasive species in foliage allocation in response to light and nutrient availability induced a better growth in non-limiting resource environments. These results give us more elements on the invasiveness of A. negundo and suggest that such behaviour could explain the ability of A. negundo to outperform native tree species, contributes to its spread in European resource-rich riparian forests and impedes its establishment under closed-canopy hardwood forests.Identifiant : DOI : 10.1186/1472-6785-11-28 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142542
in BMC Ecology > 11 (2011) . - 28 p.Porté, Annabel J., Lamarque, Laurent Jean (1983-), Lortie, Christopher, Michalet, Richard, Delzon, Sylvain (1977-) 2011 Invasive Acer negundo outperforms native species in non-limiting resource environments due to its higher phenotypic plasticity. BMC Ecology, 11: 28 p..Documents numériques
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Article (2011)Adobe Acrobat PDF
Titre : Une quantification de la confidentialité relative en climat méditerranéen : application du système de Gams (1932) au Maroc septentrional Type de document : Imprimé Auteurs : Richard Michalet Année de publication : 1994 Article en page(s) : 237-246 Langues : Français (fre) Note de contenu : Actes du colloque "Ecologie et biogéographie alpines" de septembre 1990 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=138179
in Revue valdôtaine d'histoire naturelle > 48 (suppl.) (1994) . - 237-246Michalet, Richard 1994 Une quantification de la confidentialité relative en climat méditerranéen : application du système de Gams (1932) au Maroc septentrional. Revue valdôtaine d'histoire naturelle, 48(suppl.): 237-246.
PermalinkLe rôle de la facilitation pour la biodiversité dans les environnements contraints / Richard Michalet (2006)
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