Sep 1, 1971
Abstract The larvae of 10 species of aquatic insects (Trichoptera, Plecoptera, Ephemeroptera, and Diptera) were subjected to unseasonably high winter water temperatures in the laboratory from November through July. The stonefly Pteronarcys dorsata and the burrowing mayfly Hexagenia limbata emerged in January, 5 months earlier than their natural June emergence time. All other test species exhibited similar premature emergence under test conditions. The time between emergence of males and females was increased by increased water temperatures.