OBSERVATIONS ON THE BIOLOGY OF AMETROPUS-NEAVEI (EPHEMEROPTERA, AMETROPODIDAE) FROM A LARGE RIVER IN NORTHERN ALBERTA, CANADA

Ametropus neavei McDunnough populations apparently inhabit only large rivers. In the Athabasca River of northeastern Alberta, Canada, the species has an univoltine life cycle, with some overlap of generations. There appears to be an extended emergence period (June and July), the nymphs are found in flowing water at depths greater than 0.5 m, and the population is almost entirely small-particle detritivores. © 1979, Entomological Society of Canada. All rights reserved.