Life history and distribution of mayflies (Ephemeroptera) in some acid streams in south central Ontario, Canada

Abstract

At least 29 mayfly species were recorded from the streams, with 16 common enough for life history analysis. No mayflies were found in the smallest, most acid stream, and numbers of mayfly species and their relative abundances generally increased with both increasing stream size and stream pH. Incorporation of life cycle information with distributional data enabled the authors to determine the precise stream-water pH range encountered by different mayfly life stages in the study streams. Generally, during the period of greatest acid stress in the streams (pH depressions associated with spring snowmelt) the mayflies were present in large or dormant stages, which are believed to be more tolerant of lowered pH. -from Authors