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REPRODUCTIVE POTENTIAL OF LABORATORY-REARED MANDUCA SEXTA (LEPIDOPTERA: SPHINGIDAE) AS AFFECTED BY SEX RATIO

Published online by Cambridge University Press:  31 May 2012

J. G. Stewart  and
B. J. R. Philogène
J. G. Stewart
Affiliation:
Department of Biology, University of Ottawa, Ottawa, Ontario K1N 6N5
B. J. R. Philogène
Affiliation:
Department of Biology, University of Ottawa, Ottawa, Ontario K1N 6N5
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Abstract

The influence of sex ratio on the reproductive ability of the tobacco hornworm, Manduca sexta, was examined under laboratory controlled conditions. The optimum sex ratio was found to be 0.50 (F/T) displaying the highest rate of oviposition and egg production. The fertility of the eggs laid was linearly dependent on the number of males present in each ratio. Unmated females lived longer and began oviposition later than mated females. The percentage of the total egg production retained by the females was highest for the 0.17 and 0.83 ratios and may be attributed to a stress-related impairment of reproductive behaviour.

Résumé

L'influence de l'indice de masculinité sur la capacité reproductrice du sphinx du tabac, Manduca sexta, a été étudiée en laboratoire. On a trouvé que l'indice optimum est de 0.50 F/T, cette proportion donnant le taux le plus élevé d'oviposition et d'ovogenèse. La fertilité des oeufs pondus dépendait, de façon linéaire, du nombre de mâles présents dans chaque groupe étudié. Les femelles vierges ont vécu plus longtemps et ont commencé leur ponte plus tard que celles qui se sont accouplées. Le pourcentage de la production totale d'oeufs retenus par les femelles était plus élevé pour les indices 0.17 et 0.83 et peut être attribuable à une altération reliée au stress du comportement reproducteur.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 3 , March 1983 , pp. 295 - 298
Copyright
Copyright © Entomological Society of Canada 1983

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