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 (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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Ammann, Brigitta

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0253-6730

Publisher:

Muséum d'Histoire naturelle de Genève

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

23 Jan 2018 09:13

Last Modified:

23 Jan 2018 09:13

BORIS DOI:

10.7892/boris.109198

URI:

https://boris.unibe.ch/id/eprint/109198

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