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

Abstract

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Post‐Last Glacial Maximum glacier fluctuations in the southern Écrins massif (westernmost Alps): insights from 10Be cosmic ray exposure dating

“…The average annual temperature in our study area varies between 4 and 6 °C and mean annual precipitation amounts to 1500–2000 mm (Ponel et al . ).…”

History of Larix decidua Mill. (European larch) since 130 ka

“…Based on pollen data ( de Beaulieu, 1977;Ortu, 2002), a preliminary estimation would be c. 10 ka. In the Inner French Alps, macrofossils, charcoals and pollen records (Ali et al, 2005;Blarquez et al, 2009;Ponel et al, 2011) indicate an establishment between 9 ka and 8 ka, though earlier scattered macrofossils point to an earlier presence of Larix in the Vanoise Massif (Lac du Loup, 2035 m a.s.l., Blarquez et al 2009). In the central Eastern Alps, records covering the early Holocene are scarce.…”

Holocene environmental history of a small Mediterranean island in response to sea-level changes, climate and human impact

“…Palaeoentomological studies have already demonstrated that insect remains in a deposit are not necessarily related to the immediate surrounding area (Kenward, 1975(Kenward, , 1976, that insect macrofossils could undergo important taphonomical problems (Kenward, 1976;Ponel et al, 2011) and that deposition of dead beetles from far-afield by wind and water could lead to the formation of complex fossil assemblages, difficult to interpret (Ponel and Richoux, 1997). Beetle taxa were regularly represented by a single occurrence in the sediment core CAVA-1.…”

“…5), could correspond to an early presence of domestic cattle 2500 years before the first archaeological evidence of human presence in the Lavezzi archipelago. Co-occurrences of these bio-indicators have often been used as markers of pastoralism but it is necessary to interpret dung beetle fossils carefully: these specialized insects could be associated with domestic mammals and pastoralism but they could also reveal the local presence of wild animals as shown in the Alps (Lemdahl 2000;Ponel et al, 2001Ponel et al, , 2011 cal. yr B.P.)…”

“…Many species are specific to very narrow ecological niches, they respond quickly to ecosystem shifts and disturbances, and they are relatively easy to identify to species or species-group level. Recent multidisciplinary studies including pollen and coleopteran analyses provide original and independent data concerning forest dynamics, human activities and climate (Ponel et al, 1992(Ponel et al, , 2001(Ponel et al, , 2011Gustavsson et al, 2009;Tessier et al, 1993). This study is the first multidisciplinary analysis including Coleoptera carried out in the Corso-Sardinian region.…”