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Auteur Antoine Guisan (1966-) |
Documents disponibles écrits par cet auteur (6)
Affiner la rechercheAssesing alpine plant vulnerability to climate change: a modeling perspective / Antoine Guisan (2000)
Titre : Assesing alpine plant vulnerability to climate change: a modeling perspective Type de document : Tiré à part de revue Auteurs : Antoine Guisan (1966-) ; Jean-Paul Theurillat Année de publication : 2000 Importance : 307-320 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Changement climatique
[CBNPMP-Thématique] Relations climat-végétationRésumé : The potential ecological impact of ongoing climate change has been much discussed. High mountain ecosystems were identified early on as potentially very sensitive areas. Scenarios of upward species movement and vegetation shift are commonly discussed in the literature. Mountains being characteristically conic in shape, impact scenarios usually assume that a smaller surface area will be available as species move up. However, as the frequency distribution of additional physiographic factors (e.g., slope angle) changes with increasing elevation (e.g., with few gentle slopes available at higher elevation), species migrating upslope may encounter increasingly unsuitable conditions. As a result, many species could suffer severe reduction of their habitat surface, which could in turn affect patterns of biodiversity. In this paper, results from static plant distribution modeling are used to derive climate change impact scenarios in a high mountain environment. Models are adjusted with presence/absence of species. Environmental predictors used are: annual mean air temperature, slope, indices of topographic position, geology, rock cover, modeled permafrost and several indices of solar radiation and snow cover duration. Potential Habitat Distribution maps were drawn for 62 higher plant species, from which three separate climate change impact scenarios were derived. These scenarios show a great range of response, depending on the species and the degree of warming. Alpine species would be at greatest risk of local extinction, whereas species with a large elevation range would run the lowest risk. Limitations of the models and scenarios are further discussed. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=131325 Guisan, Antoine (1966-), Theurillat, Jean-Paul 2000 Assesing alpine plant vulnerability to climate change: a modeling perspective. Integrated assessment, 1(4) : 307-320.Evidence of climatic niche shift during biological invasion / O Broennimann in Ecology Letters, 10 (7) (2007)
Titre : Evidence of climatic niche shift during biological invasion Type de document : Imprimé Auteurs : O Broennimann ; U.A. Treier ; Heinz Müller-Schärer (1954-) ; Wilfried Thuiller (1975-) ; A. T. Peterson ; Antoine Guisan (1966-) Année de publication : 2007 Article en page(s) : 701-709 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Centaurea maculosa Lam. Lien pérenne : DOI : 10.1111/j.1461-0248.2007.01060.x Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142443
in Ecology Letters > 10 (7) (2007) . - 701-709Broennimann, O, Treier, U.A., Müller-Schärer, Heinz (1954-), Thuiller, Wilfried (1975-), Peterson, A. T., Guisan, Antoine (1966-) 2007 Evidence of climatic niche shift during biological invasion. Ecology Letters, 10(7): 701-709.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité R12668 P-782 Revue Centre de documentation Revues Consultable 
Titre : Flore alpine et réchauffement à travers le XXe siècle Type de document : Imprimé Auteurs : Pascal Vittoz ; Sandrine Jutzeler ; Antoine Guisan (1966-) Année de publication : 2005 Article en page(s) : 49-59 Langues : Français (fre) Catégories : [OIEAU-Thèmes] Changement climatiques
[CBNPMP-Thématique] Changement climatique
[CBNPMP-Thématique] BiodiversitéRésumé : Le réchauffement climatique, particulièrement important dans les Alpes suisses, est susceptible d'induire un déplacement de la flore vers les sommets. Aux Grisons et en Autriche, des études précédentes ont déjà mis en évidence l'enrichissement floristique de sommets alpins depuis le début du XXe siècle. Trois sommets valaisans sont considérés ici: le Gornergrat (avec un premier inventaire floristique en 1919), le Torrenthorn (environ 1885) et le Beaufort (environ 1920). Chaque sommet a été réinventorié en 2003 dans le cadre du projet «Permanent.Plot.ch.» Tous ont montré une forte augmentation du nombre d'espèces présentes. Au Gornergrat (3135 m), seize espèces n'ont pu être retrouvées mais trente-cinq nouvelles ont été observées, avec un total passant de cent deux à cent vingt et une, ce qui en fait un sommet exceptionnellement riche par rapport à son altitude. La richesse floristique a passé de vingt-quatre à soixante-trois espèces au Torrenthorn (2924 m) et de seize à quarante-huit au Beaufort (3048 m). Comme ailleurs, cet enrichissement semble être associé au réchauffement climatique car les nouvelles espèces sont liées, en moyenne, à des températures plus élevées que celles qui étaient déjà présentes. Au Gornergrat et au Beaufort, elles montrent un développement des pelouses alpines, alors qu'au Torrenthorn, ce sont plutôt des espèces des rochers et sols bruts qui s'installent. Cette différence pourrait être due à l'impact important des randonneurs sur la végétation de ce dernier sommet. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=154049
in Bulletin de la Murithienne > 123 (2005) . - 49-59Vittoz, Pascal, Jutzeler, Sandrine, Guisan, Antoine (1966-) 2005 Flore alpine et réchauffement à travers le XXe siècle. Bulletin de la Murithienne, 123: 49-59.Documents numériques
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Titre : Overcoming limitations of modelling rare species by using ensembles of smallmodels Type de document : Imprimé Auteurs : Frank T. Breiner ; Antoine Guisan (1966-) ; Ariel Bergamini ; Michael P. Nobis Année de publication : 2015 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Messicole Note de contenu : 1- Species distribution models (SDMs) have become a standard tool in ecology and applied conservation biology. Modelling rare and threatened species is particularly important for conservation purposes. However, modelling rare species is difficult because the combination of few occurrences and many predictor variables easily leads to model overfitting. A new strategy using ensembles of small models was recently developed in an attempt to overcome this limitation of rare species modelling and has been tested successfully for only a single species so far. Here, we aim to test the approach more comprehensively on a large number of species including a transferability assessment. 2- For each species, numerous small (here bivariate) models were calibrated, evaluated and averaged to an ensemble weighted by AUC scores. These ‘ensembles of small models’ (ESMs) were compared to standard SDMs using three commonly used modelling techniques (GLM, GBM and Maxent) and their ensemble prediction. We tested 107 rare and under-sampled plant species of conservation concern in Switzerland. 3- We show that ESMs performed significantly better than standard SDMs. The rarer the species, the more pronounced the effects were. ESMs were also superior to standard SDMs and their ensemble when they were evaluated using a transferability assessment. 4- By averaging simple small models to an ensemble, ESMs avoid overfitting without losing explanatory power through reducing the number of predictor variables. They further improve the reliability of species distribution models, especially for rare species, and thus help to overcome limitations of modelling rare species.
Lien pérenne : DOI : 10.1111/2041-210X.12403 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148446
in Methods in ecology and evolution > 6 (2015)Breiner, Frank T., Guisan, Antoine (1966-), Bergamini, Ariel, Nobis, Michael P. 2015 Overcoming limitations of modelling rare species by using ensembles of smallmodels. Methods in ecology and evolution, 6.Documents numériques
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Titre : Vegetation classification and biogeography of European floodplain forests and alder carrs Type de document : Numérique Auteurs : Jan Douda ; Karel Boublik ; Michal Slezak ; Idoia Biurrun ; Josef Nociar ; Alena Havrodová ; Jana Doudová ; Svetlana Acic ; Henri Brisse ; Jörg Brunet ; Milan Chytrý (1967-) ; Hugues Claessens ; János Csiky ; Yakiv Didukh ; Panayotis Dimopoulos ; Stefan Dullinger ; Una FitzPatrick ; Antoine Guisan (1966-) ; Peter J. Horchler ; Richard Hrivnák ; Ute Jandt ; Zygmunt Kącki ; Balázs Kevey ; Flavia Landucci ; Hugues Lecomte ; Jonathan Lenoir ; Jaanus Paal ; David Paternoster ; Harald Pauli ; Remigiusz Pielech ; John S. Rodwell ; Bart Roelandt ; Jens-Christian Svenning ; Jozef Šibík ; Urban Silc ; Zeljko Skvorc ; Ioannis Tsiripidis ; Rossen T. Tzonev ; Thomas Wohlgemuth ; Niklaus E. Zimmermann Année de publication : 2015 Article en page(s) : 17 p. Langues : Anglais (eng) Résumé : Aim: Formalized classifications synthesizing vegetation data at the continental scale are being attempted only now, although they are of key importance for nature conservation planning. Therefore, we aim to provide a vegetation classification and to describe the main biogeographical patterns of floodplain forests and alder carrs in Europe. Location: Europe. Methods: A database of more than 40 000 vegetation plots of floodplain forests and alder carrs across Europe was compiled. After geographic stratification, 16 392 plots were available for classification, which was performed using the supervised method Cocktail. We also searched for new associations using semi-supervised K- means classification. The main biogeographic patterns and climate-related gradients in species composition were determined using detrended correspondence analysis and cluster analysis. Results: Thirty associations of floodplain forests and alder carrs were distinguished, which belong to five alliances. The Alnion incanae includes riparian, seepage and hardwood floodplain forests in the nemoral and hemiboreal zones (dominated by Alnus glutinosa and Fraxinus excelsior) and in the boreal zone (dominated by A. incana). The Osmundo-Alnion represents oceanic vegetation dominated by Alnus glutinosa, Fraxinus angustifolia and F. excelsior distributed mostly on the Iberian Peninsula and composed of species with Atlantic distribution and Iberian endemics. The Populion albae comprises floodplain forests frequently dominated by Fraxinus angustifolia, Populus alba and P. nigra that are widespread in floodplains of large rivers under summer-dry climates in the Mediterranean region. The Platanion orientalis represents eastern Mediterranean floodplain forests dominated by Platanus orientalis. The Alnion glutinosae includes forest swamps dominated by Alnus glutinosa distributed mostly in the nemoral and hemiboreal zones. The main biogeographic patterns within European floodplain forests and alder carrs reflect the climatic contrasts between the Mediterranean, nemoral, boreal and mountain regions. Oceanic flood-plain forests differ from those in the rest of Europe. The hydrological regime appears to be the most important factor influencing species composition within regions. Conclusions: This study is the first applying a formalized classification at the association level for a broad vegetation type at the continental scale. The proposed classification provides the scientific basis for the necessary improvement of the habitat classification systems used in European nature conservation Lien pérenne : DOI : 10.1111/avsc.12201 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=143079
in Applied vegetation science > 18 (11/2015) . - 17 p.Douda, Jan, Boublik, Karel, Slezak, Michal, Biurrun, Idoia, Nociar, Josef, Havrodová, Alena, Doudová, Jana, Acic, Svetlana, Brisse, Henri, Brunet, Jörg, Chytrý, Milan (1967-), Claessens, Hugues, Csiky, János, Didukh, Yakiv, Dimopoulos, Panayotis, Dullinger, Stefan, FitzPatrick, Una, Guisan, Antoine (1966-), Horchler, Peter J., Hrivnák, Richard, Jandt, Ute, Kącki, Zygmunt, Kevey, Balázs, Landucci, Flavia, Lecomte, Hugues, Lenoir, Jonathan, Paal, Jaanus, Paternoster, David, Pauli, Harald, Pielech, Remigiusz, Rodwell, John S., Roelandt, Bart, Svenning, Jens-Christian, Šibík, Jozef, Silc, Urban, Skvorc, Zeljko, Tsiripidis, Ioannis, Tzonev, Rossen T., Wohlgemuth, Thomas, Zimmermann, Niklaus E. 2015 Vegetation classification and biogeography of European floodplain forests and alder carrs. Applied vegetation science, 18: 17 p..Documents numériques
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