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évolution de migration

International Journal of Tropical Insect Science (1)

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1 results

Migration and low population density in armyworm (Lepidoptera: Noctuidae) life histories
A. G. Gatehouse
Journal:

Insect Science and Its Application / Volume 8 / Issue 4-5-6 / December 1987

Published online by Cambridge University Press:

19 September 2011, pp. 573-580

Print publication:

December 1987
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Field and laboratory evidence now suggests that the African armyworm, Spodoptera exempta, is specifically adapted for survival at low population densities, providing a new basis for understanding the significance of its phase polyphenism and migratory strategy. This conclusion allows deductions to be made as to the expected extent of displacement of flying moths from low and, when they occur as a result of impeded or inadequate dispersal of parent moths, high density populations. The proposed migratory strategy which depends on the genetic determination of flight potential also provides a framework for interpreting observed patterns of armyworm outbreaks through the season and in relation to rainfall. Traits associated with a low-density, “armyworm” strategy are shared by other Noctuids which may have similar life histories.