Vegetation, insects, molluscs and stable isotopes from Late-Würm deposits at Lobsigensee (Swiss Plateau)

Ammann, Brigitta; Chaix, Louis; Eicher, Ulrich; Elias, Scott A.; Gaillard, Marie-José; Hofmann, Wolfgang; Siegenthaler, Ulrich; Toboiski, Kazimierz; Wilkinson, B. (1983). Vegetation, insects, molluscs and stable isotopes from Late-Würm deposits at Lobsigensee (Swiss Plateau). Revue de Paléobiologie, 2(2), pp. 221-227. Muséum d'Histoire naturelle de Genève

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At a littoral site of Lobsigensee northwest of Bern pollen (including Betula, pollen size measurements), plant macrofossils, Coleoptera, Trichoptera, Chironomidae, Ceratopogonidae, Mollusca, delta-18C and delta-13C from Late-Würm sediments were studied. In the clay of Oldest Dryas the expansion of Betula nana was recorded from the level where the first Coleoptera, Trichoptera and Mollusca occurred and a change in the chironomid fauna took place. The transition from Oldest Dryas to Bölling was sharply marked by the sediment (clay/lake marl transition), by vegetation (beginning of reforestation), by chironomid fauna (disappearance of cold stenothermic species) and by high mollusc frequencies; only a small rise of delta-18C in carbonate is recorded. During the Bölling a faunal shift among Coleoptera and Trichoptera suggests a rise of mean July temperature from 10-12°C to 14-16°C. No climatic cooling between Bölling and Alleröd was found. A Younger Dryas climatic cooling was indicated by pollen diagrams, by delta-18C and by a minimum among molluscs, but not by changes in the species composition of the insects. These data support the view that rising annual and summer temperatures favored a vegetational and faunal development reaching a major step around 13 300-13 000 B.P.; the only climatic reversal registered was the Younger Dryas.

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