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A Novel method for estimating the pre-reproductive period of female african armyworm moths, Spodoptera Exempta

Published online by Cambridge University Press:  19 September 2011

Kenneth Wilson
Kenneth Wilson
Affiliation:
School of Biological Sciences, University of Wales – Bangor, Gwynedd, LL57 2UW, UK
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Abstract

In the majority of insects, migration occurs exclusively or predominantly during the pre-reproductive period (PRP) and therefore, the duration of the PRP provides a useful index of migratory potential. The present study describes a novel method for estimating the PRP of Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). It relies on the fact that as the female approaches sexual maturity, there is a substantial change in the shape of her gonopore-patch (an area of black scales at the posterior of the abdomen). Gonopore-patch shape (GPS) is strongly correlated with PRP (as determined by “calling” behaviour) and may prove to be the best method for estimating migratory potential in some circumstances. A number of other species of moths also have gonopore-patches which may aid the study of their migration.

Résumé

Chez la plupart des insectes, la migration se produit exclusivement ou abondament pendant la période précédant la reproduction. Par conséquent, la durée de cette période peut journir un indice utile du potential migrateur de ces insectes. L'étude dont il est question dans cet article décrit une méthode nouvelle pour l'estimation du PRP de la femelle de Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). La methode vient du fait que, chez la femelle, juste avant la maturité sexuelle, il y a un changement substantial de la forme de son rustine (I'aggloromeration d'écailles noires à la partie postérieure de I'abdomen). II existe une grande corrélation entre la forme du rustine (“GPS”) et la PRP (comme indiqué par le comportement et le cri d'appel de la femelle). Dans certaines circonstances, le GPS peut être la meilleure méthode pour estimer le potentiel migrateur. Chez d'autres espéces de papillons de nuit, il existe également des GPS qui pourraient servir, éventuellement, dans l'étude de leur migration.

Keywords

African armywormgonopore-patch sizepre-reproductive periodcalling behaviourmoth migration
Type
Research Artilces
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 3 , June 1993 , pp. 325 - 331
Copyright
Copyright © ICIPE 1993

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References

REFERENCES

Colvin, J. and Gatehouse, A. G. (1993) The reproduction-flight syndrome and the inheritance of tethered-flight activity in the cotton-boll worm moth, Helicoverpa armigera. Physiol. Entomol. 18, 16–22.CrossRefGoogle Scholar
Dewhurst, C. F. (1984) Some observations on the mating habits of the African armyworm, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). Entomologist's Mon. Mag. 120, 119–125.Google Scholar
Gatehouse, A. G. (1986) Migration in the African armyworm Spodoptera exempta: genetic determination of migratory capacity and a new synthesis. In Insect Flight, Dispersal and Migration (Edited by Danthanarayan, W.), pp. 128–44. Springer-Verlag, Berlin.CrossRefGoogle Scholar
Haggis, M. J. (1986) Distribution of the African armyworm, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae), and the frequency of larval outbreaks in Africa and Arabia. Bull. Entomol. Res. 76, 151–170.CrossRefGoogle Scholar
Han, E.-N. and Gatehouse, A. G. (1991) Genetics of pre-calling period in the Oriental armyworm, Mythimna separata (Walker) (Lepidoptera: Noctuidae), and implications for migration. Evolutions, 1502–1510.CrossRefGoogle Scholar
Hill, J. K. and Gatehouse, A. G. (1993) Genetic control of the pre-reproductive period in the silver Y moth Autographa gamma (L.) (Lepidoptera: Noctuidae). Heredity 69, 458–464.CrossRefGoogle Scholar
Hinton, H. E. (1981) Biology of Insect Eggs. Pergamon Press, Oxford.Google Scholar
Kennedy, J. S. (1961) A turning point in the study of insect migration. Nature 189, 789–791.CrossRefGoogle Scholar
Khasimuddin, S. (1978) Courtship and mating behaviour of the African armyworm, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). Bull. entomol. Res. 68, 195–202.CrossRefGoogle Scholar
McNeil, J. N. (1986) Calling behaviour: can it be used to identify migratory species of moths? Fla. Entomol. 69, 78–84.CrossRefGoogle Scholar
Otindo, B. L. ( 1977) Morphology and histology of the female sex pheromone gland in the armyworm moth, Spodoptera exempta. ICIPE Fifth Annual Report pp. 12–13.Google Scholar
Page, W. W. (1988) Varying durations of arrested oocyte development in relation to migration in the African armyworm moth Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). Bull, entomol. Res. 78, 181–198.Google Scholar
Riley, J. R., Reynolds, D. R. and Farmery, M. J. (1983) Observations of the flight behaviour of the armyworm moth, Spodoptera exempta at an emergence site using radar and infra-red optical techniques. Ecol. Entomol. 8, 395–418.CrossRefGoogle Scholar
Rose, D. J. W., Page, W. W., Dewhurst, C. F., Riley, J. R., Reynolds, D. R., Pedgley, D. E. and Tucker, M. R. (1985) Downwind migration of the African armyworm moth Spodoptera exempta studied by mark-and-capture and radar. Ecol. Entomol. 10, 299–313.CrossRefGoogle Scholar
Rose, D. J. W., Dewhurst, C. F., Page, W. W. and Fishpool, L. D. C. (1987) The role of migration in the life system of the African armyworm Spodoptera exempta (Wlk.). Insect Sci. Applic. 8, 561–569.Google Scholar
Siegel, S. and Castellan, N. J. (1988) Nonparametric Statisticsm for the Behavioural Sciences (2nd Edn.). McGraw-Hill, Singapore.Google Scholar
Turgeon, J. and McNeil, J. N. (1982) Calling behaviour of the armyworm, Pseudaletia unipuncta. Entomol. Exp. Appi. 31, 402–408.CrossRefGoogle Scholar
Wilson, K. and Gatehouse, A. G. (1993) Seasonal and geographical variation in the migratory potential of outbreak populations of the African armyworm moth Spodoptera exempta. J. Anim. Ecol. 62, 169–181.CrossRefGoogle Scholar