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POSTGLACIAL COLONIZATION OF CANADA BY ITS SUBBOREAL WINTER STONEFLIES OF THE GENUS ALLOCAPNIA1

Published online by Cambridge University Press:  31 May 2012

Herbert H. Ross
Affiliation:
Illinois Natural History Survey, Urbana
George L. Rotramel
Affiliation:
Illinois Natural History Survey, Urbana
John E. H. Martin
Affiliation:
Entomology Research Institute, Canada Department of Agriculture, Ottawa
J. Frank McAlpine
Affiliation:
Entomology Research Institute, Canada Department of Agriculture, Ottawa

Abstract

The three boreal species of the winter stonefly genus Allocapnia, minima (Newport), pygmaea (Burmeister), and illinoensis Frison are subboreal species whose ranges include a band across eastern Canada from the western end of Lake Superior to the east coast; minima occurs also in Newfoundland. An analysis of variation in pygmaea and illinoensis suggests that during the Wisconsin glacial maximum these two species occurred south of the ice in the Cumberland Plateau region in east-central United States, and that they dispersed first northward through the Appalachians, then east and west into their present range. Geoclimatic evidence suggests that minima did not persist in Newfoundland during the glacial maximum. Its ecological similarity to pygmaea suggests that minima also persisted in the Cumberland Plateau area and dispersed in the same fashion as the other two species.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1967

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