||Effect of Elevated Water Temperature on Insect Emergence in Outdoor Experimental Channels.
Nordlie, Kathleen J. ;
Arthur, John W. ;
||Environmental Research Lab.-Duluth, Monticello, MN. Monticello Ecological Research Station.
Aquatic biology ;
Mississippi River ;
Thermal gradients ;
Dissolved gases ;
Field tests ;
Water pollution effects(Animals) ;
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Emergence of adult aquatic insects was evaluated weekly with plexiglass traps positioned in two outdoor experimental channels from April through August 1977. One channel was seasonal Mississippi River water temperature and the other maintained at 10C above. Maximum water temperatures reached 31.0C in the ambient and 40.8C in the heated channel. Chironomids comprised 84% of the insects collected in both channels. The temperature in the heated channel (10C above ambient) advanced the emergence of two Chironominae, one Orthocladiinae, one Ceratopogonidae and one Zygopteran species by one to four weeks.