Diel Emergence Patterns of some Mayflies (Ephemeroptera) of the Roseau River (Manitoba, Canada)
Emergence of mayflies was monitored at 2 h intervals throughout one 48 h period in each of June, July and August, 1976. In all three study periods most emergence occurred from mid-day until dark, with peak emergence at dusk. The main exceptions to these general trends were Baetis intercalaris whose peak emergence occurred at mid-day in June, and some females of B. intercalaris and Tricorythodes nr. allectus which emerged at dawn. The time of day of emergence was similar for most species from day to day and month to month. In species where considerable numbers of males and females emerged, peak emergence of both sexes tended to occur during the same 2 h periods.
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