Skip to Main content Skip to Navigation
Journal articles

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

Abstract : 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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [75 references]  Display  Hide  Download

https://hal-amu.archives-ouvertes.fr/hal-02959291
Contributor : Emmanuel Gandouin <>
Submitted on : Tuesday, October 6, 2020 - 4:33:11 PM
Last modification on : Wednesday, October 14, 2020 - 3:55:03 AM

File

4_Gandouin et al 2007 HOL-HAL....
Files produced by the author(s)

Identifiers

Collections

Citation

Emmanuel Gandouin, Philippe Ponel, Evelyne Franquet, Brigitte van Vliet-Lanoë, Valérie Andrieu-Ponel, et al.. Chironomid responses (Insect: Diptera) to Younger Dryas and Holocene environmental changes in a river floodplain from northern France (St-Momelin, St-Omer basin). The holocene, London: Sage, 2016, 17 (3), pp.331-347. ⟨10.1177/0959683607076447⟩. ⟨hal-02959291⟩

Share

Metrics

Record views

32

Files downloads

56