Annual patterns of emergence of some Quebec stoneflies (Insecta: Plecoptera)

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Abstract
Twelve series of collections of adults from emergence traps in four streams and from six different years provide data on the annual emergence patterns of Plecoptera. Of the 24 species collected, 15 were in sufficient number to be studied in detail. Each species has a typical emergence pattern which it maintains year after year despite climatic variations. Two types of pattern are distinguished: a synchronous and an extended emergence. Species with a wide temperature tolerance can, however, present both types. Usually equal numbers of both sexes are collected and the males on the whole often emerge before the females. Closely related species normally have different emergence periods.

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