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11 results on '"Michelle Leydet"'

1. Postglacial change of the floristic diversity gradient in Europe

Author

Thomas Giesecke, Steffen Wolters, Jacqueline F. N. van Leeuwen, Pim W. O. van der Knaap, Michelle Leydet, Simon Brewer, Palaeo-ecologie, Sub Handelsrecht & Notariaat, Coastal dynamics, Fluvial systems and Global change, Palaeoecology, Department of Physical Geography, Faculty of Geosciences, Utrecht University, Department of Palynology and Climate Dynamics, Georg-August-University [Göttingen], Niedersächsisches Institut für Historische Küstenforschung (NIHK), Oeschger Centre for Climate Change Research (OCCR), University of Bern, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Geography Department, University of Utah, DFG grant GI 732/5-2. S.B. was partly supported by NSF grant EAR-1003848., and Georg-August-University = Georg-August-Universität Göttingen

Subjects
Ecology, Chemistry(all), Biochemistry, Genetics and Molecular Biology(all), Science, Climate Change, Climate-change ecology, Biodiversity, Plants, 580 Plants (Botany), Physics and Astronomy(all), respiratory system, Palaeoclimate, Global Warming, Article, Europe, Climate warming, Biogeography, [SDU]Sciences of the Universe [physics], [SDE]Environmental Sciences, Pollen, lcsh:Q, lcsh:Science, human activities
Abstract

Climate warming is expected to cause a poleward spread of species, resulting in increased richness at mid to high latitudes and weakening the latitudinal diversity gradient. We used pollen data to test if such a change in the latitudinal diversity gradient occurred during the last major poleward shift of plant species in Europe following the end of the last glacial period. In contrast to expectations, the slope of the gradient strengthened during the Holocene. The increase in temperatures around 10 ka ago reduced diversity at mid to high latitude sites due to the gradual closure of forests. Deforestation and the introduction of agriculture during the last 5 ky had a greater impact on richness in central Europe than the earlier climate warming. These results do not support the current view that global warming alone will lead to a loss in biodiversity, and demonstrate that non-climatic human impacts on the latitudinal diversity gradient is of a greater magnitude than climate change., Climate-induced poleward shifts in plant distributions could flatten latitudinal diversity gradients. However, here the authors show that the spread of forests after the last ice age reduced diversity in central and northern Europe, and that human land-use over the past 5000 years strengthened the latitudinal gradient in plant diversity.

Published
2019
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2. Coprophilous Coleoptera vs fungal spores, examples from Iran and from the Alps

Author

Philippe Ponel, Valérie Andrieu-Ponel, Monika Badura, De Beaulieu Jacques-Louis, Mona Court-Picon, Morteza Djamali, Frédéric Guiter, Hamid Lahijani, Michelle Leydet, Marjan Mashkour, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Faculty of Civil and Environmental Engineering Gdańsk University of Technology Gdańsk Poland, Institut Royal des Sciences Naturelles de Belgique (IRSNB), Iranian National Institute for Oceanography and Atmospheric Sciences (INIOAS), Archéozoologie, archéobotanique : sociétés, pratiques et environnements (AASPE), and Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

3. Fossil beetles as possible evidence for transhumance during the middle and late Holocene in the high mountains of Talysch (Talesh) in NW Iran?

Author

Michelle Leydet, Marjan Mashkour, Valérie Andrieu-Ponel, Philippe Ponel, Hamid Lahijani, Morteza Djamali, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Iranian National Institute for Oceanography and Atmospheric Sciences (INIOAS), Archéozoologie, archéobotanique : sociétés, pratiques et environnements (AASPE), and Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010506 paleontology, Archeology, Steppe, Pastoralism, Environmental Science (miscellaneous), Iran, medicine.disease_cause, 01 natural sciences, Pollen, Temperate climate, medicine, 0601 history and archaeology, Sediment core, Holocene, 0105 earth and related environmental sciences, geography.geographical_feature_category, Middle East, 060102 archaeology, Ecology, 06 humanities and the arts, 15. Life on land, Archaeological evidence, Coleoptera, Geography, [SDE]Environmental Sciences, Neor lake
Abstract

International audience; A short sediment core (300 cm) was retrieved from a peaty deposit in the northeastern corner of Lake Neor in NW Iran yielding a 6500-year-old sequence relatively rich in pollen and beetle remains. Beetle assemblages contained a significant amount of coprophagous and coprophilous species all along the core. Pollen spectra suggest an open steppe landscape typical of the modern Irano-Turanian highlands with pollen indicators of agro-pastoral activities and also the proximity of the mesic temperate Hyrcanian forest to the east. Together, insect and pollen evidence, in agreement with the archaeological evidence for NW Iran, suggest that pastoralism was practised in the high elevation surroundings of Neor in Talysch Mountains at least since ca. 6500 years ago. This preliminary study highlights the strong potential of palaeoentomological investigations in furthering our understanding of the history of pastoralism in the Middle East.

Published
2013
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4. The European Modern Pollen Database (EMPD) project

Author

Basil A. S. Davis, Marco Zanon, Pamella Collins, Achille Mauri, Johan Bakker, Doris Barboni, Alexandra Barthelmes, Celia Beaudouin, Anne E. Bjune, Elissaveta Bozilova, Richard H. W. Bradshaw, Barbara A. Brayshay, Simon Brewer, Elisabetta Brugiapaglia, Jane Bunting, Simon E. Connor, Jacques-Louis de Beaulieu, Kevin Edwards, Ana Ejarque, Patricia Fall, Assunta Florenzano, Ralph Fyfe, Didier Galop, Marco Giardini, Thomas Giesecke, Michael J. Grant, Jöel Guiot, Susanne Jahns, Vlasta Jankovská, Stephen Juggins, Marina Kahrmann, Monika Karpińska-Kołaczek, Piotr Kołaczek, Norbert Kühl, Petr Kuneš, Elena G. Lapteva, Suzanne A. G. Leroy, Michelle Leydet, José Guiot, José Antonio López Sáez, Alessia Masi, Isabelle Matthias, Florence Mazier, Vivika Meltsov, Anna Maria Mercuri, Yannick Miras, Fraser J. G. Mitchell, Jesse L. Morris, Filipa Naughton, Anne Birgitte Nielsen, Elena Novenko, Bent Odgaard, Elena Ortu, Mette Venås Overballe-Petersen, Heather S. Pardoe, Silvia M. Peglar, Irena A. Pidek, Laura Sadori, Heikki Seppä, Elena Severova, Helen Shaw, Joanna Święta-Musznicka, Martin Theuerkauf, Spassimir Tonkov, Siim Veski, W. O. van der Knaap, Jacqueline F. N. van Leeuwen, Jessie Woodbridge, Marcelina Zimny, Jed O. Kaplan, López Sáez, José Antonio, ÉcolePolytechniqueFédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental, Center for Archaeological Sciences, Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Dipartimento de Scienze Animali, Vegetali e dell' Ambiente, Università degli Studi del Molise = University of Molise (UNIMOL), Department of Geography, University of Hull-University of Hull, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), ICAC, Icac, Laboratorio di Palinologia e Paleobotanica, School of Geography, Plymouth University-Plymouth University, Géographie de l'environnement (GEODE), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di biologia ambientale, Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), López Sáez, José Antonio [0000-0002-3122-2744], Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Università del Molise, Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UMR237-Aix Marseille Université (AMU)-Avignon Université (AU), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J), Università degli Studi di Roma 'La Sapienza' [Rome], Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], and Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP)

Subjects
010506 paleontology, Archeology, Research groups, europe, pollen, epd, empd, surface sample, database, 010504 meteorology & atmospheric sciences, Climate change, Plant Science, 580 Plants (Botany), computer.software_genre, medicine.disease_cause, 01 natural sciences, Proxy (climate), Database, Pollen, medicine, EMPD, Biogeosciences, 0105 earth and related environmental sciences, Surface sample, Surface Sample, EPD, Europe, Paleontology, 15. Life on land, Geography, European Pollen Database, [SDE]Environmental Sciences, computer
Abstract

Davis, B.A.S. et al., Modern pollen samples provide an invaluable research tool for helping to interpret the quaternary fossil pollen record, allowing investigation of the relationship between pollen as the proxy and the environmental parameters such as vegetation, land-use, and climate that the pollen proxy represents. The European Modern Pollen Database (EMPD) is a new initiative within the European Pollen Database (EPD) to establish a publicly accessible repository of modern (surface sample) pollen data. This new database will complement the EPD, which at present holds only fossil sedimentary pollen data. The EMPD is freely available online to the scientific community and currently has information on almost 5,000 pollen samples from throughout the Euro-Siberian and Mediterranean regions, contributed by over 40 individuals and research groups. Here we describe how the EMPD was constructed, the various tables and their fields, problems and errors, quality controls, and continuing efforts to improve the available data.

Published
2013
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5. Climatic variations across the Mediterranean Basin reconstructed from pollen and vegetation model

Author

Joel Guiot, Michelle Leydet, Armand Rotereau, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UMR237-Aix Marseille Université (AMU)-Avignon Université (AU), Ecosystèmes continentaux et risques environnementaux (ECCOREV), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), and Leydet, Michelle

Subjects
[SDE] Environmental Sciences, atmosphere interactions, Biosphere, [SDE]Environmental Sciences, Paleoclimatology and paleoceanography
Abstract

International audience; The Mediterranean Basin is a complex region with a complex topography at the interface of two climatic systems. Water availability is the main limiting factor of vegetation at low elevation and both temperature and precipitation are equally important at higher elevation. We propose here a gridded reconstruction of the Holocene climate at the scale of the Mediterranean region from pollen by using a vegetation model in inverse mode (Guiot et al, 2009) and so relating vegetation changes to climatic changes in a more mechanistic way than standard statistical approaches. The proxy data used are the pollen series stored in the European Pollen Database (EPD) for the Mediterranean Basin. The period covered is the last 10 ky at a multi-decadal time-step and the climatic variables are winter, summer temperature and precipitation, as well as soil water. BIOME4 model (Kaplan et al, 2003) uses as inputs monthly temperature, precipitation variables and provides outputs comparable to pollen data (assuming that there is a relationship between plant productivity and pollen counts). The idea behind paleoclimatological reconstructions is then to obtain inputs, given outputs. This procedure, called model inversion, is achieved with appropriate algorithms in the frame of the Bayesian statistical theory. As CO2 atmospheric concentration is also an input of the model, it is possible to take into account the true variations of the concentration across Holocene to reconstruct the climate. We will present gridded maps of climatic change for typical periods where Mediterranean Basin has known important water stresses.

Published
2012

6. Structure and dynamics of ecosystems during the recent glaciations of the Quaternary in Medio-European and Mediterranean areas

Author

Valérie Andrieu-Ponel, Jacques-Louis de Beaulieu, Soumaya Belmecheri, Svante Björck, Simon Brewer, Jacques Brulhet, Pascal Campagne, Coste, G., Emmanuel Gandouin, Frédéric Guiter, Didier Kéravis, George Kukla, Elisabeth Lallier-Vergès, Michelle Leydet, Gérard Nicoud, Philippe Ponel, Frank Preusser, Maurice Reille, Patrick Rioual, Nicolas Thouveny, Daniel Veres, Linda Ampel, Ulrich von Grafenstein, Barbara Wohlfarth, Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP), Université Paul Cézanne - Aix-Marseille 3-Centre National de la Recherche Scientifique (CNRS)-Avignon Université (AU)-Université de Provence - Aix-Marseille 1, University of Utah, Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Avignon Université (AU)-Centre National de la Recherche Scientifique (CNRS), and Leydet, Michelle

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010

7. Organisation et dynamique des écosystèmes pendant les glaciations récentes du Quaternaire dans les régions médio-européennes et méditerranéennes

Author

Valérie Andrieu-Ponel, Jacques-Louis de Beaulieu, Soumaya Belmecheri, Svante Björck, Simon Brewer, Jacques Brulhet, Coste, G., Emmanuel Gandouin, Frédéric Guiter, Didier Kéravis, George Kukla, Elisabeth Lallier-Vergès, Michelle Leydet, Gérard Nicoud, Frank Preusser, Maurice Reille, Patrick Rioual, Nicolas Thouveny, Daniel Veres, Linda Ampel, Ulrich von Grafenstein, Barbara Wohlfarth, Leydet, Michelle, Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP), Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Avignon Université (AU)-Centre National de la Recherche Scientifique (CNRS), University of Utah, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Paul Cézanne - Aix-Marseille 3-Centre National de la Recherche Scientifique (CNRS)-Avignon Université (AU)-Université de Provence - Aix-Marseille 1, and Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA)

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010

8. Vegetation and climate changes in the French Alps for the last 140 000 yr

Author

Valérie Andrieu-Ponel, Jacques-Louis de Beaulieu, Soumaya Belmecheri, Simon Brewer, Jacques Brulhet, Emmanuel Gandouin, Frédéric Guiter, George Kukla, Elisabeth Lallier-Vergès, Michelle Leydet, Anson Mackay, David Morley, Gérard Nicoud, Philippe Ponel, Frank Preusser, Maurice Reille, Patrick Rioual, Nicolas Thouveny, Daniel Veres, Ulrich von Grafenstein, Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP), Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Avignon Université (AU)-Centre National de la Recherche Scientifique (CNRS), University of Utah, Université Paul Cézanne - Aix-Marseille 3-Centre National de la Recherche Scientifique (CNRS)-Avignon Université (AU)-Université de Provence - Aix-Marseille 1, and Leydet, Michelle

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2009

9. Réponse des écosystèmes ouest-européens aux fluctuations rapides du climat (Heinrich et Dansggard-Oeschger) pendant le glaciaire wurmien (OIS 4 à OIS 2)

Author

Valérie Andrieu-Ponel, Linda Ampel, Jacques-Louis de Beaulieu, Soumaya Belmecheri, Svante Björck, Simon Brewer, Jacques Brulhet, Coste, G., Emmanuel Gandouin, Frédéric Guiter, Didier Kéravis, George Kukla, Elisabeth Lallier-Vergès, Michelle Leydet, Anson Mackay, David Morley, Gérard Nicoud, Philippe Ponel, Frank Preusser, Maurice Reille, Patrick Rioual, Nicolas Thouveny, Daniel Veres, Ulrich von Grafenstein, Barbara Wohlfarth, Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP), Université Paul Cézanne - Aix-Marseille 3-Centre National de la Recherche Scientifique (CNRS)-Avignon Université (AU)-Université de Provence - Aix-Marseille 1, University of Utah, Leydet, Michelle, and Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Avignon Université (AU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

10. Response of the Western-European ecosystems to rapid climatic fluctuations (Heinrich and Dansggard-Oeschger) during glacial times (OIS 4 to OIS 2)

Author

Valérie Andrieu-Ponel, Linda Ampel, Jacques-Louis de Beaulieu, Soumaya Belmecheri, Svante Björck, Simon Brewer, Jacques Brulhet, Coste, G., Emmanuel Gandouin, Frédéric Guiter, Didier Kéravis, George Kukla, Elisabeth Lallier-Vergès, Michelle Leydet, Anson Mackay, David Morley, Gérard Nicoud, Philippe Ponel, Frank Preusser, Maurice Reille, Patrick Rioual, Nicolas Thouveny, Daniel Veres, Ulrich von Grafenstein, Leydet, Michelle, Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP), Université Paul Cézanne - Aix-Marseille 3-Centre National de la Recherche Scientifique (CNRS)-Avignon Université (AU)-Université de Provence - Aix-Marseille 1, University of Utah, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Avignon Université (AU)-Centre National de la Recherche Scientifique (CNRS), and Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

11. Holocene history of Lac des Lauzons (2180 m a.s.l.), reconstructed from multiproxy analyses of Coleoptera, plant macroremains and pollen (Hautes-Alpes, France)

Author

Jacques-Louis de Beaulieu, Emmanuel Gandouin, Michelle Leydet, Alexandre Buttler, Morteza Djamali, Frédéric Guiter, Philippe Ponel, Monika Badura, Mona Court-Picon, Valérie Andrieu-Ponel, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Laboratoire de chrono-écologie - CNRS (UMR6565) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Universiteit Gent = Ghent University (UGENT), Faculty of Civil and Environmental Engineering Gdańsk University of Technology Gdańsk Poland, Laboratoire Chrono-environnement (UMR 6249) (LCE), Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Federal Research Institute (WSL), Switzerland, Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UMR237-Aix Marseille Université (AMU)-Avignon Université (AU), Universiteit Gent = Ghent University [Belgium] (UGENT), and Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE)

Subjects
treeline, 010506 paleontology, Archeology, Peat, Environments, 010502 geochemistry & geophysics, medicine.disease_cause, Paleoenvironments, 01 natural sciences, High-Altitude, Swiss Alps, Altitude, Pollen, medicine, Stadial, plant macro-remains, French Alps, Merveilles, climate, Holocene, 0105 earth and related environmental sciences, Earth-Surface Processes, Netherlands, Global and Planetary Change, Vegetation, Ecology, Paleontology, Macrofossil, fossil Coleoptera, 15. Life on land, Spectra, Timberline, pollen, [SDE]Environmental Sciences, Period (geology), human action, Geology
Abstract

International audience; A 1.70 m core extracted from the Lac des Lauzons, Haut Champsaur, French Alps, at 2180 m altitude, provided a detailed Holocene record of beetles, pollen and plant macrofossils, enabling the reconstruction of local palaeoenvironmental changes during the last 10 000 years. After an early phase of colonization by plants and insects, corresponding to the Lateglacial interstadial, a long phase of relative stability of the ecosystems (at least in the vicinity of the lake) is recorded. Strikingly, there is no evidence from beetle and plant macrofossils that the treeline reached the altitude of Lauzons during the Holocene climate optimum, although this period is characterized by major forest expansion in many high-altitude sites in the southern French Alps. The uppermost part of the record is blurred by the infilling of the lake, progressively turning into a peat bog. This sequence also provides an opportunity to compare the records of coprophilous fungal spores and coprophilous beetles and to improve the interpretation of these proxies in terms of their significance as proxies for pastoralism.

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