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FECUNDITY, LONGEVITY, AND SEX RATIO OF APHIDIUS NIGRIPES (HYMENOPTERA: APHIDIIDAE) PARASITIZING DIFFERENT STAGES OF ITS HOST, MACROSIPHUM EUPHORBIAE (HOMOPTERA: APHIDIDAE)1

Published online by Cambridge University Press:  31 May 2012

Conrad Cloutier ,
Jeremy N. McNeil  and
Jacques Regnière
Conrad Cloutier
Affiliation:
Département de biologie, Université Laval, Québec, Québec G1K 7P4
Jeremy N. McNeil
Affiliation:
Département de biologie, Université Laval, Québec, Québec G1K 7P4
Jacques Regnière
Affiliation:
Département de biologie, Université Laval, Québec, Québec G1K 7P4
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Abstract

The longevity and age specific fecundity, as well as the sex ratio of the progeny, were obtained for Aphidius nigripes Ashmead females given access to the five developmental stages of the potato aphid, Macrosiphum euphorbiae (Thomas). Neither female longevity nor fecundity, as measured by the total number of aphids parasitized, were significantly different for the various host stages. The percentage of females in the progeny decreased as the female parasite aged, and the overall sex ratio of progeny was significantly affected by the host stage attacked although no direct relationship with host size was evident. However in a separate experiment where parasitism was controlled (females not permitted to attack more than 10 hosts per day), the host stage (size) significantly affected the sex ratio of progeny, with more females emerging from larger than smaller hosts.

These data indicate that all developmental stages of M. euphorbiae, when presented separately, are suitable to A. nigripes.

Résumé

La longévité et la fécondité spécifique à l’âge, ainsi que le rapport des sexes dans la progéniture, ont été obtenus pour des femelles d’Aphidius nigripes Ashmead ayant accès à l’un ou l’autre des cinq stades de développement de son hôte, Macrosiphum euphorbiae (Thomas). La longévité, et la fécondité telle que mesurée par le nombre total d’hôtes parasités, ne diffèrent pas significativement entre les différents stades de l’hôte. La proportion des femelles dans la progéniture décroît avec l’âge du parasite, et le rapport des sexes calculé sur l’ensemble de la progéniture est significativement affecté par le stade de l’hôte quoique l’effet ne soit pas directement lié à la taille de l’hôte. Cependant, des expériences de parasitisme contrôlé (10 hôtes par jour, une seule attaque par hôte) démontrent que le rapport des sexes est affecté par le stade de l’hôte, une proportion plus élevée de femelles étant obtenue sur les stades plus avancés.

Nos résultats indiquent que lorsque le choix de la femelle d’A. nigripes est limité à l’un ou l’autre des cinq stades de M. euphorbiae, tous les stades sont également convenables comme hôtes.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 3 , March 1981 , pp. 193 - 198
Copyright
Copyright © Entomological Society of Canada 1981

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