Chironomid analysis in northern Quebec and arctic Canada

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To better quantify the changes of temperature through time, a model will be created to quantify temperature using the larvae of insects (chironomids) preserved in lake sediments. These larvae will be sampled in 190 lakes from southern Quebec to Ellesmere Island. Each taxa will be attributed a temperature optimum and these optima will be used to create a quantitative model for temperature reconstruction. Sediment cores will be extracted from many lakes in a north-south transect to reconstruct the temperature during the last 10 000 years using the communities of chironomids preserved in the sediments. The data will indicate the natural variation of climate through time, as well as the changes observed since anthropogenic activities have started.