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Entomophaga

, Volume 32, Issue 2, pp 149–157 | Cite as

Genetic variability in the egg-laying behaviour ofTrichogramma maidis

  • C. Chassain
  • M. Bouletreau
Article

Abstract

SomeTrichogramma maidis females [Hymenoptera: Trichogrammatidae] aggregate their eggs in adjacent hosts whereas others scatter them amongst distant host eggs.

The individual variability of aggregated-attack behaviour in matedTrichogramma maidis females was studied by isolating them with a uniform patch of about 500Ephestia kuehniella [Lepidoptera: Pyralidae] UV killed eggs.

Genetic analysis demonstrated that similar behaviour exists between sisters and that the trait is transmissible and relatively stable over 2 successive generations.

The ethological basis and the ecological significance of this variability are discussed.

Key-Words

Trichogramma maidis oophagous parasitoid egg aggregation genetic variability 

Résumé

Nous avons étudié la dispersion de la ponte des femelles deTrichogramma maidis [Hymenoptera: Trichogrammatidae] fécondées et isolées sur une ooplaque uniforme d'environ 500 œufs d'Ephestia kuehniella [Lepidoptera: Pyralidae] tués par irradiation aux ultra-violets.

Ce caractère comportemental possède une variabilité individuelle au sein de la population étudiée: certaines Φ agrègent leur ponte alors que d'autres ont tendance à la disperser. L'analyse génétique montre d'une part qu'il existe pour ce caractère une ressemblance entre les individus d'une même famille et, d'autre part, qu'il est transmissible et relativement stable au cours de 2 générations successives.

Les bases éthologiques et la signification écologique sont discutées.

Mots Clefs

Trichogramma maidis parasitoïdes oophages agrégation des œufs variabilité génétique 

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Copyright information

© Lavoisier Abonnements 1987

Authors and Affiliations

  • C. Chassain
    • 1
  • M. Bouletreau
    • 1
  1. 1.Laboratoire de Génétique des Populations (UA CNRS 243)Université Lyon IVilleurbanneFrance

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