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The Holocene
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Chironomid responses (Insect: Diptera) to Younger Dryas and Holocene environmental changes in a river floodplain from northern France (St-Momelin, St-Omer basin)

Emmanuel Gandouin

IMEP, UMR-6116/CNRS, Université Paul Cézanne, Europôle Méditerranéen de l'Arbois, Pavillon Villemin, BP 80, F-13545 Aix-en-Provence Cedex 04, France, e.gandouin{at}univ-cezanne.fr

Philippe Ponel

IMEP, UMR-6116/CNRS, Université Paul Cézanne, Europôle Méditerranéen de l'Arbois, Pavillon Villemin, BP 80, F-13545 Aix-en-Provence Cedex 04, France

Evelyne Franquet

IMEP, UMR-6116/CNRS, Université Paul Cézanne, Europôle Méditerranéen de l'Arbois, Pavillon Villemin, BP 80, F-13545 Aix-en-Provence Cedex 04, France

Brigitte Van Vliet-Lanoë

PBDS, UMR-8110/CNRS, UST-Lille, F-59655 Villeneuve d'Ascq Cedex, France

Valérie Andrieu-Ponel

IMEP, UMR-6116/CNRS, Université Paul Cézanne, Europôle Méditerranéen de l'Arbois, Pavillon Villemin, BP 80, F-13545 Aix-en-Provence Cedex 04, France

David H. Keen

IAA, University of Birmingham, Birmingham B15 2TT, UK

Jacques Brulhet

ANDRA, Service de Géologie et Géoprospective, Parc de la Croix Blanche, 1/7 rue Jean Monnet, F-92298 Châtenay-Malabry, France

Marcel Brocandel

ANDRA, Service de Géologie et Géoprospective, Parc de la Croix Blanche, 1/7 rue Jean Monnet, F-92298 Châtenay-Malabry, France

Lateglacial to Holocene subfossil chironomids from the St-Omer basin at St-Momelin (northern France) were analysed. At the end of the Lateglacial, stratigraphic and chironomid sequences indicate a shallow, oligotrophic and slow-flowing freshwater stream, with abundant aquatic macrophytic vegetation. Cold-water adapted taxa indicate a cold climate. During the early Holocene, from about 9500 to 7700 conventional radiocarbon yr BP, climate improvement is marked by an increase in warm-water adapted taxa and a decrease in cold-water fauna. However, the cold-water fauna persist, probably because of both the instability and continentality of the climate. During the mid Holocene, from about 7700 to 6000 BP, the marine transgression strongly influenced the river's hydrological regime and consequently the chironomid assemblages. At that time, eutrophic, warm and shallow stagnant-water conditions occured throughout the basin. From 6000 to 3200 BP, the St-Momelin basin was subjected to a marine regression. Chironomids indicate a hydrological regime marked by an alternance of phases with either a dominance of rheophilous or limnophilous fauna. During this period, equivalent percentages of warm- and cold-adapted taxa may be explained by cold-water input in context of a temperate climate.

Key Words: Palaeoecology • palaeoclimate • Holocene • marine transgression • hydrological regime • river floodplain • North Sea • Chironomidae • northern France.

The Holocene, Vol. 17, No. 3, 331-347 (2007)
DOI: 10.1177/0959683607076447
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