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DIAPAUSE INTENSITY IN A FRENCH UNIVOLTINE AND A SASKATCHEWAN COMMERCIAL STRAIN OF MEGACHILE ROTUNDATA (FAB.)

Published online by Cambridge University Press:  31 May 2012

G.H. Rank  and
F.P. Rank
G.H. Rank
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
F.P. Rank
Affiliation:
Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
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Abstract

The relative diapause intensity of a French univoltine and Saskatchewan commercial strain of the alfalfa leafcutting bee, Megachile rotundata (Fab.), was evaluated over a 3-year period. Prepupae from both strains underwent diapause development at 10 °C for different time periods. Diapause intensity was estimated by scoring days to emergence after initiating incubation at three different times in each of the 3 years: fall incubation (immediate post harvest); winter incubation; and spring incubation. In all comparisons made, the univoltine strain had a significantly increased diapause intensity compared with the commercial strain. We concluded that diapause intensity was heritable and that this stable difference between strains could provide the basis for a selected line with increased univoltinism under field conditions.

Résumé

L’intensité relative de diapause d’une souche française univoltine et d’une souche commerciale de Saskatchewan de l’abeille mégachile Megachile rotundata (Fab.), a été étudiée pendant 3 ans. A 10 °C, le développement de diapause des deux souches a duré des périodes différentes. L’intensité de diapause a été estimée en comptant les jours précédant l’émergence après la mise en incubation à trois moments différents pour chacune des 3 années : automne (juste après la récolte); hiver; et printemps. Dans toutes les comparaisons, la souche univoltine a montré une intensité significativement plus élevée de diapause que la souche commerciale. On a conclu que l’intensité de diapause était héréditaire et que la stabilité de la différence entre les souches pourrait servir de base pour la sélection en faveur de l’univoltinisme en conditions naturelles.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 2 , February 1989 , pp. 141 - 148
Copyright
Copyright © Entomological Society of Canada 1989

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References

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