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THE MECHANISM OF SPERM PRECEDENCE IN THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)1

Published online by Cambridge University Press:  31 May 2012

Arthur Retnakaran
Arthur Retnakaran
Affiliation:
Insect Pathology Research Institute, Canadian Forestry ServiceSault Ste. Marie, Ontario
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Abstract

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The mechanism of sperm precedence in the spruce budworm was studied using a genetic marker. When female moths with red-eyes, a recessive trait, are mated twice within a day, first with a red-eyed male followed by a black-eyed male, three types of offspring were observed in the F1 generation. Some females produced only red-eyed offspring; another group produced only black-eyed progeny; a third group produced a mixture of both types. This indicates that sperms received from either or both matings may be utilized. The time interval between successive sperm transfers appears to be the underlying factor that determines sperm precedence in this insect; a hypothesis to explain this phenomenon is presented.

Résumé

Au moyen de marques génétiques, l’auteur étudia le mécanisme de précédence de sperme chez la Tordeuse des bourgeons de l’épinette. Lorsque des adultes femelles à yeux rouges (trait récessif) furent accouplées deux fois le même jour, d’abord avec un male aux yeux rouges puis avec un mâle aux yeux noirs, trois types de rejetons furent observés lors de la génération F1. Quelques femelles produisirent seulement des rejetons aux yeux rouges; d’autres seulement des rejetons aux yeux noirs, et d’autres produisirent un mélange des deux types. Ce résultat indique les spermes de l’un ou l’autre accouplement peuvent être utilisés. L’intervale de temps entre les transferts successifs de sperme semble le facteur de base qui préside à la précédence de sperme chez cet insecte et l’auteur fournit une hypothèse visant à expliquer ce phénomène.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 11 , November 1974 , pp. 1189 - 1194
Copyright
Copyright © Entomological Society of Canada 1974

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