POULENARD , Jérôme

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High-resolution record of Holocene erosion patterns in a high altitude lake (Lake Anterne, NW French Alps): a witness of environmental changes, climatic variability and human activities

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Approche d'un territoire de montagne : occupations humaines et contexte pédo-sédimentaire des versants du col du Petit-Saint-Bernard, de la Préhistoire à l'Antiquité

International audience

International audience

International audience

As part of a multi-year programme, survey campaigns have been carried out on both slopes of the Petit-Saint-Bernard pass (2188 m, western Alps), at an altitude of between 750 and 3000 m. The method employed abandons ground-based surveying in favour of multiple manual surveys carried out on selected topographic contexts down to the base of the...

International audience

As part of a multi-year programme, survey campaigns have been carried out on both slopes of the Petit-Saint-Bernard pass (2188 m, western Alps), at an altitude of between 750 and 3000 m. The method employed abandons ground-based surveying in favour of multiple manual surveys carried out on selected topographic contexts down to the base of the...

De 2003 à 2007, une étude archéologique et sédimentaire a été réalisée sur les versants du col du Petit-Saint-Bernard (2188 m, Alpes occidentales), par de grandes séries de sondages manuels effectués dans des contextes sélectionnés. Les avantages et les inconvénients de cette méthodologie sont exposés et discutés. Ce travail a permis...

Edytem equipe 1 2003-2010

Two well-dated ca Holocene-long sedimentary sequences from deepest parts of Lake Bourget provide new insights onto the evolution of erosion patterns at a regional scale in NW European Alps. The combination of high resolution geochemistry e XRF core scanning, calibrated by 150 punctual measurements e and isotope geochemistry ( 3Nd) of the...

A high-resolution sedimentological and geochemical study was performed on a 20 m long core from the alpine Lake Anterne (2063 m a.s.l., NW French Alps) spanning the last 10 ka. Sedimentation is mainly of minerogenic origin. The organic matter quantity (TOC%) as well as its quality (hydrogen (HI) and oxygen (OI) indices) both indicate the...

Ancient human presence in the mountain landscapes of the Alps has been documented by archaeological and palaeoecological studies which show a change from gathering to pastoralism over the last 4 ka. Above 2000 m, landscapes have been exploited at least since the Bronze Age. Human activities rendered soils vulnerable to colluviation, increasing...

A 144-cm-long core was obtained in Lake Petit (2200 m a.s.l., Mediterranean French Alps) in order to reconstruct past interactions between humans, the environment and the climate over the last five millennia using a multidisciplinary approach involving sedimentological, geochemical and botanical analyses. We show a complex pattern of...

Ancient human presence in the mountain landscapes of the Alps has been documented by archaeological and palaeoecological studies which show a change from gathering to pastoralism over the last 4 ka. Above 2000 m, landscapes have been exploited at least since the Bronze Age. Human activities rendered soils vulnerable to colluviation, increasing...

L'analyse multiproxies à haute résolution d'une séquence sédimentaire prélevée dans le Lac Petit (alt. 2 200 m, vallon des Millefonts, Mercantour, France) a permis d'étudier les interactions climat-environnement-Homme à l'Holocène récent en contexte de haute montagne dans les Alpes du Sud. Grâce aux analyses lithostratigraphiques, géochimiques...

International audience

What are the long-term consequences of invasive species? After invasion, how long do ecosystems require to reach a new equilibrium? Answering these questions requires long-term, high-resolution data that are vanishingly rare. We combined the analysis of environmental DNA extracted from a lake sediment core, coprophilous fungi, and...

Archaeological studies carried out in the European Alps have documented ancient human occupation of mountains, characterized by hunting, pastoral activities and mining. High resolution multi-proxy analyses, including sedimentological, palynological and geochemical investigations, were carried out on a 144 cm-long sediment core from the Lac...