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SOME ASPECTS OF THE POPULATION DYNAMICS OF SEMIOTHISA SPECIES (GEOMETRIDAE: ENNOMINAE) IN SOUTHERN MANITOBA LARCH BOGS

Published online by Cambridge University Press:  31 May 2012

Jean-Marie Bergeron  and
Charles H. Buckner
Jean-Marie Bergeron
Affiliation:
Zoology Department, University of Manitoba, Winnipeg
Charles H. Buckner
Affiliation:
Chemical Control Research Institute, Canadian Forestry Service, Ottawa
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Abstract

Studies of the population dynamics of the Semiothisa complex in Manitoba larch bogs indicated that the fluctuations in the numbers of this complex were clearly related to mortality in the pupal stage, which is therefore a “key” stage. Density-dependent factors are evidently operating in the dynamics of these insect populations. Interrelationships exist between the various Semiothisa species and also between looper and larch sawfly numbers.

Résumé

A la suite d’études sur la dynamique des populations du complexe spécifique appartenant au genre Semiothisa dans des tourbières à Mélèzes au Manitoba, les auteurs concluent que les fluctuations numériques de ces populations sont nettement reliées à leur mortalité au stade de pupe, qui est donc un “stade-clé”. Des facteurs qui dépendent de la densité influent sans doute sur la dynamique de ces populations d’insectes. Des rapports réciproques existent entre les diverses espèces de Semiothisa et aussi entre les populations d’Arpenteuses et de Tenthrède du Mélèze.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 9 , September 1974 , pp. 957 - 968
Copyright
Copyright © Entomological Society of Canada 1974

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