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DISTURBANCE OF ECLOSION SEQUENCE IN HYBRID LEPIDOPTERA

Published online by Cambridge University Press:  31 May 2012

Charles G. Oliver
Charles G. Oliver
Affiliation:
R. D. 1, Box 78, Scottdale, Pennsylvania 15683
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Abstract

Some interspecific and interpopulation Lepidoptera and Orthoptera hybrids show a syndrome of developmental abnormalities referred to here as the “sequence effect.” In normal within population broods of Lepidoptera males develop slightly faster than females, but in crosses showing the sequence effect, females in one direction of the cross develop faster and in the reciprocal cross much more slowly than their male siblings. In some cases the environmentally induced diapause of the females may differ strikingly from that of their male siblings. Development rate and diapause in these species appear to be controlled by a sex-linked coadapted gene complex. Expression of the sequence effect may result from a loss of a species- or population-specific balance between regulatory and secretory portions of this complex, resulting in hormonal abnormalities which are more likely to be expressed in the heterogametic sex (females in Lepidoptera, males in Orthoptera).

Résumé

Des hybrides interspécifiques et interpopulations de certains Lépidoptères et Orthoptères sont affectés par un syndrome d'anomalies du développement désigné ici comme étant un “effet de séquence.” Chez les portées intra-populations normales de Lépidoptères, les mâles se développent légèrement plus vite que les femelles, mais à la suite de croisements produisant "l'effet de séquence", les femelles issues du croisement dans un sens se développent plus rapidement, et celles issues du croisement réciproque, plus lentement, que les mâles de la même portée. Dans certains cas, la diapause induite par l'environnement peut être très différente chez les mâles et les femelles de la même portée. La vitesse de développement et la diapause chez ces espèces semblent être contrôlées par un complexe coadapté de gènes liés au sexe. L'expression de "l'effet de séquence" pourrait résulter de la perte d'équilibre spécifique à l'espèce ou à la population, entre la partie régulatrice et la partie secrétaire de ce complexe, causant des anomalies hormonales plus susceptibles de se manifester chez le sexe hétérogamétique (femelles chez les Lépidoptères, mâles chez les Orthoptères).

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 11 , November 1983 , pp. 1445 - 1452
Copyright
Copyright © Entomological Society of Canada 1983

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