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Analysis of the reproductive potential of diploid males in the wasp Diadromus pulchellus (Hymenoptera: Ichneumonidae)

Published online by Cambridge University Press:  10 July 2009

M. El Agoze ,
J. M. Drezen ,
S. Renault  and
G. Periquet
M. El Agoze
Affiliation:
IBEAS, URA CNRS 1298, Université François Rabelais, Faculté des Sciences, Tours, France
J. M. Drezen
Affiliation:
IBEAS, URA CNRS 1298, Université François Rabelais, Faculté des Sciences, Tours, France
S. Renault
Affiliation:
IBEAS, URA CNRS 1298, Université François Rabelais, Faculté des Sciences, Tours, France
G. Periquet*
Affiliation:
IBEAS, URA CNRS 1298, Université François Rabelais, Faculté des Sciences, Tours, France
*
IBEAS, Université François Rabelais, Faculté des Sciences, Avenue Monge, Parc Grandmont, 37200 Tours, France.
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Abstract

In the ichneumonid wasp Diadromus pulchellus (Wesmael), diploid males may regularly be produced in laboratory populations by inbreeding. They are viable, produce diploid sperm and are equally capable of multiple inseminations as are haploid males. Their spermatozoa are also able to penetrate the oocyte. Progeny sired by diploid males are essentially haploid sons with only a few daughters. The sons are normal haploid individuals, produced in a frequency significantly higher than in crosses between females and haploid males. The daughters are normal diploid females probably resulting from the fertilization of an oocyte by an exceptional haploid sperm rarely produced by diploid males. Triploid individuals were not observed and their absence was correlated with the high mortality observed during the first developmental stages. The death of these individuals is discussed in the light of the phenomenon of superparasitism to explain the increase in the frequency of sons produced in crosses with diploid males. Despite their viability, their ability to produce sperm and their normal potential insemination, diploid males of Diadromus pulchellus are therefore almost sterile.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 84 , Issue 2 , June 1994 , pp. 213 - 218
Copyright
Copyright © Cambridge University Press 1994

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