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SFS Annual Meeting

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Chironomids spend their immature life stages in water and emerge as adults into the terrestrial environment. Once out of the water, they are exposed to air temperatures. It is probable that their ability to adapt to variable air temperatures is a result of their exposure to specific water temperatures as immatures. Research conducted in Minnesota indicates that chironomids emerging from trout streams in winter are cold adapted and long-lived when exposed to cold air temperatures. However, a comparison between chironomids emerging from cold and warm streams still warrants investigation. Results from my study at the alpine Hengill geothermal area in southwestern Iceland shows that 80% of female Diamesa (Diptera: Chironimidae) emerging from cold springs during the summer survived up to 28 days when incubated at 6°C in the lab. Eighty percent of males survived up to 17 days at the same temperature. In contrast, 0% of both males and females survived past day 7 when incubated at 20°C. Other chironomid taxa collected from cold springs followed a similar trend. Results from this project support our Minnesota research with Diamesa adults indicating that they are adapted to cold air temperatures.

Corrie Nyquist (Primary Presenter/Author), University of Minnesota,;

Leonard Ferrington, Jr. (Co-Presenter/Co-Author), University of Minnesota,;

Gisli Mar Gislason (Co-Presenter/Co-Author), University of Iceland,;

Sigrun Oddgeirsdottir (Co-Presenter/Co-Author), University of Iceland,;