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EFFECTIVENESS OF THE SECOND MATING IN A BISEXUAL TRICHOGRAMMA SPECIES AND THE FIRST MATING IN A THELYTOKOUS TRICHOGRAMMA SPECIES (HYMENOPTERA: TRICHOGRAMMATIDAE)

Published online by Cambridge University Press:  31 May 2012

Bernard Pintureau ,
M. Del Pilar Iglesias Calvin  and
Simon Grenier
Bernard Pintureau
Affiliation:
INSA, UA INRA 203, Laboratoire de Biologie appliquée, Bâtiment 406, 20 avenue A. Einstein, 69 621-Villeurbanne-cedex, France
M. Del Pilar Iglesias Calvin
Affiliation:
INSA, UA INRA 203, Laboratoire de Biologie appliquée, Bâtiment 406, 20 avenue A. Einstein, 69 621-Villeurbanne-cedex, France
Simon Grenier
Affiliation:
INSA, UA INRA 203, Laboratoire de Biologie appliquée, Bâtiment 406, 20 avenue A. Einstein, 69 621-Villeurbanne-cedex, France
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Abstract

A chromatic mutation, dark body (mutants with a darker body than wild individuals), allowed us to test the effectiveness of the second mating in the bisexual species Trichogramma turkestanica Meyer, and of the first mating in the thelytokous species T. cordubensis Vargas and Cabello. Second mating in T. turkestanica was mostly efficient (i.e. followed by fertilization). Nevertheless, the latency before the second mating was longer as the time between second and first matings increased. The utilization of the spermatozoa from the second mating increased as the stock of spermatozoa from the first mating decreased. A long time in the presence of a male was necessary to obtain mating of the thelytokous females of T. cordubensis. Such fertilized females produced a low percentage (28%) of daughters from bisexual reproduction.

Résumé

Une mutation à effet chromatique, «dark body» (mutants ayant un corps plus sombre que celui des individus sauvages), a permis de tester l’efficacité du 2ème accouplement chez l’espèce Trichogramma turkestanica Meyer à reproduction bisexuée et l’efficacité du 1er accouplement chez l’espèce T. cordubensis Vargas et Cabello à reproduction thélytoque. Chez T. turkestanica, le 2ème accouplement est possible et le plus souvent efficace (i.e. suivi par une fécondation). Il est toutefois d’autant plus difficile à obtenir que le temps écoulé depuis le 1er accouplement est long. L’utilisation des spermatozoïdes du 2ème accouplement augmente au fur et à mesure que le stock de spermatozoïdes issus du 1er accouplement se réduit. Chez T. cordubensis, les femelles thélytoques peuvent être fécondées. Toutefois, elle n’acceptent l’accouplement qu’après une longue période de mise en présence avec un mâle. Ces femelles fécondées donnent un pourcentage relativement faible (28%) de filles issues de la sexualité.

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 1 , February 1997 , pp. 35 - 41
Copyright
Copyright © Entomological Society of Canada 1997

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