Journal of Chemical Ecology

, Volume 17, Issue 11, pp 2063–2075

Chemical basis of egg cannibalism in a caterpillar (Utetheisa ornatrix)

Authors

  • Franz Bogner
    • Section of Neurobiology and BehaviorCornell University
  • Thomas Eisner
    • Section of Neurobiology and BehaviorCornell University
Article

DOI: 10.1007/BF00987992

Cite this article as:
Bogner, F. & Eisner, T. J Chem Ecol (1991) 17: 2063. doi:10.1007/BF00987992

Abstract

Larvae of the mothUtetheisa ornatrix are shown to cannibalize eggs in the laboratory. They proved most cannibalistic if they were systemically deficient in pyrrolizidine alkaloid (PA), the defensive agent that protectsUtetheisa at all stages of development against predation, and whichUtetheisa acquire as larvae from their food plant. In exercising cannibalistic choice,Utetheisa larvae feed preferentially on eggs that are PA-Iaden rather than PA-free. Egg cannibalism can therefore provideUtetheisa with a supplemental means of PA procurement. Moreover, presence of PA in the egg, while providing the egg with defense against predation, can increase its vulnerability to cannibalism. Although evidence is presented thatUtetheisa larvae cannibalize eggs in nature, it is argued that such feeding may occur only opportunistically in the wild, rather than as a matter of course.

Key Words

Utetheisa ornatrixLepidopteraArctiidaepyrrolizidine alkaloidegg cannibalismacquired defensephagostimulantspecific hunger

Copyright information

© Plenum Publishing Corporation 1991