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Evolution of assemblages of Chironomidae Insecta Diptera during the Late-glacial period in Lake Lautrey Jura, France attempt at a paleoenvironmental reconstruction Evolution des assemblages de Chironomidae Insecta Diptera pendant le Tardiglaciaire dans le Lac du Lautrey Jura, France essai de reconstruction paleoenvironnementale



Evolution of assemblages of Chironomidae Insecta Diptera during the Late-glacial period in Lake Lautrey Jura, France attempt at a paleoenvironmental reconstruction Evolution des assemblages de Chironomidae Insecta Diptera pendant le Tardiglaciaire dans le Lac du Lautrey Jura, France essai de reconstruction paleoenvironnementale



Eclogae Geologicae Helvetiae, 96 S99-S107 (Special issue)



The study of subfossil Chironomidae assemblages from a 2.50 m long core spanning the entire Late-glacial period in Lake Lautrey (Jura, France) displays the main climatic events of this interval, i.e. Oldest Dryas, Bolling/Allerod Interstadial and Younger Dryas. Each climatic event was characterized by a particular chironomid community associated with a corresponding trophic state of the lake. Oligotrophic conditions prevailed during the Oldest Dryas, whereas a strong eutrophication characterized the Bolling/Allerod Interstadial. Moreover, the chironomid biostratigraphy appears not monotonous during this Interstadial. Two large developments of macrophyte belt were proposed at the beginning of the Bolling and the end of the Allerod, respectively. Furthermore, from their particular chironomid fauna two short intervals were identified displaying comparatively lower organic content. These intervals correspond to the Older Dryas and the Intra Allerod Cold Phase (I.A.C.P.). The beginning of the Younger Dryas is shown by a strong and rapid change in chironomid assemblages. The pelagic primary production appeared much reduced whereas the benthic production was rather favored. The progressive change in chironomid assemblages and specially the decline of C. ambigua (Zetterstedt) during the rest of the Younger Dryas, is interpreted as an improvement of the environmental conditions.

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