Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-24T17:23:52.168Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Asensio, E. 1982. Leaf cutter bee management in Spain: problems of parasitism. pp. 77–79in Rank, G.H. (Ed.), Proceedings of the First International Symposium on Alfalfa Leafcutting Bee Management. Univ. of Saskatchewan, Saskatoon, Sask.Google Scholar
Danks, H. V. 1982. Insect Dormancy: An Ecological Perspective. Biological Survey of Canada, Ottawa. p. 17.Google Scholar
Hobbs, G.A., and Richards, K.W.. 1982. Selection for a univoltine strain of Megachile (Eutricharaea) pacifica (Hymenoptera: Megachilidae). Can. Ent. 108: 165–167.CrossRefGoogle Scholar
Krunic, M.D. 1982. Voltinism in Megachile rotundata (Megachilidae: Hymenoptera) in Southern Alberta. Can. Ent. 104: 185–188.CrossRefGoogle Scholar
Krunic, M.D., and Hinks, C.F.. 1982. The effect of temperature and of temperature pretreatment on diapause and on the synchronization of adult emergence in Megachile rotundata (Hymenoptera: megachilidae). Can. Ent. 104: 889–893.CrossRefGoogle Scholar
Parker, F.D. 1982. Alfalfa leafcutter bee: origin of female and its influence on diapause. Proc. IV Int. Symp. Pollination. Md. Agric. Exp. Sta. Spec. Misc. Publ. 1: 269–272.Google Scholar
Parker, F.D. 1982. Introduction of alfalfa leafcutting bees to new areas and selection development. pp. 198–211in Rank, G.H. (Ed.), Proceedings of the First International Symposium on Alfalfa Leafcutting Bee Management. Univ. of Saskatchewan, Saskatoon, Sask.Google Scholar
Parker, F.D., and Tepedino, V.J.. 1982. Maternal influence on diapause in the alfalfa leafcutting bee (Hymenoptera: Megachilidae). Ann. Ent. Soc. Am. 75: 407–410.CrossRefGoogle Scholar
Rank, G.H., and Goerzen, D. W.. 1982. Effect of incubation temperature on emergence of Megachile rotundata (Hymenoptera: Megachilidae). J. econ. Ent. 75: 467–471.CrossRefGoogle Scholar
Tasei, J.N. 1982. Status of Megachile rotundata F. in France. pp. 239–246in Rank, G.H. (Ed.), Proceedings of the First International Symposium on Alfalfa Leafcutting Bee management. Univ. of Saskatchewan, Saskatoon, Sask.Google Scholar
Tasei, J.M., and Masure, M.M.. 1982. Sur quelques facteurs influençant le développement de Megachile pacifica Panz (Hymenoptera, Megachilidae). Apidologie 9: 273–290.CrossRefGoogle Scholar
Tepedino, V.J., and Parker, F.D.. 1982. Effect of rearing temperature on mortality, second-generation emergence, and size of adult in Megachile rotundata (Hymenoptera: Megachilidae). J. econ. Ent. 79: 978–977.Google Scholar
Toe, L. 1982. Variations intra-spécifiques chez l'abeille Megachille rotundata (F.): Comparaisons morphologique, écoéthologique et biochimique de deux souches: une Canadienne et une Française. Ph.D. thesis, Université de Poitiers.Google Scholar