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NEW RECORDS OF WINTER STONEFLIES (PLECOPTERA) FROM MANITOBA WITH NOTES ON THEIR ZOOGEOGRAPHICAL ORIGINS

Published online by Cambridge University Press:  31 May 2012

J. F. Flannagan  and
D. G. Cobb
J. F. Flannagan
Affiliation:
Freshwater Institute, Department of Fisheries and Oceans, Winnipeg, Manitoba R3T 2N6
D. G. Cobb
Affiliation:
Freshwater Institute, Department of Fisheries and Oceans, Winnipeg, Manitoba R3T 2N6
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Abstract

Recent collections (1980–1982) of winter stoneflies in southern Manitoba have resulted in the addition of five previously unrecorded species: Capnia coloradensis Claassen, C. confusa Claassen, Paracapnia angulata Hanson, Skwala parallela (Frison), and Utacapnia trava (Nebeker and Gaufin) to the nine previously recorded species. Eight of the 14 species now known from Manitoba occur in the small spring-fed streams on the east escarpment of the Duck Mountain Provincial Park. The probable zoogeographical origins and present distribution of winter stoneflies in Manitoba are explained in light of various post-glacial drainage patterns. Adults of U. trava were observed, often copulating, on the underside of the ice. They were also observed crawling away from streams with no ice cover to a distance of 50 m.

Résumé

Des récents échantillonnages (1980–1982) de perles d'hiver effectués dans le sud du Manitoba, ont permis d'ajouter cinq nouvelles espèces, notamment la Capnia coloradensis Claassen, la C. confusa Claassen, la Paracapnia angulata Hanson, la Skwala parallela (Frison), et la Utacapnia trava (Nebeker et Gaufin) aux neuf espèces déjà connues. De ces quatorze espèces manitobaines, huit proviennent de petits ruisseaux, alimentés par des sources, qui coulent sur l'escarpement est du parc provincial Duck Mountain. Les origines zoogéographiques probables et la répartition actuelle des perles d'hiver manitobaines peuvent s'expliquer à la lumière des divers systèmes hydrographiques post-glaciaires. Des adultes de l'espèce U. trava ont été observés sur le dessous de la glace, souvent en train de s'accoupler. On les a également aperçus qui quittaient en rampant les ruisseaux libres de glace, pour s'en éloigner jusqu'à 50 mètres.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 6 , June 1983 , pp. 673 - 677
Copyright
Copyright © Entomological Society of Canada 1983

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