Chemical basis of egg cannibalism in a caterpillar (Utetheisa ornatrix)
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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 WordsUtetheisa ornatrix Lepidoptera Arctiidae pyrrolizidine alkaloid egg cannibalism acquired defense phagostimulant specific hunger
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- Bell, R.A.,Owens, C.D.,Shapiro, M., andTardif, J.R. 1981. Development of mass-rearing technology, pp. 599–655,in C.C. Doane and M.L. McManus (eds.). The Gypsy Moth: Research Toward Integrated Pest Managment. USDA Technical Bulletin 1584.Google Scholar
- Bogner, F., andEisner, T. 1991. Chemical basis of pupal cannibalism in a caterpillar (Utetheisa ornatrix). Experientia. In press.Google Scholar
- Conner, W.E., Roach, B., Benedict, E., Meinwald, J., andEisner, T. 1990. Courtship pheromone production and body size as correlates of larval diet in males of the arctiid moth,Utetheisa ornatrix.J. Chem. Ecol. 16:543.Google Scholar
- Dussourd, D.E., Harvis, C.A., Meinwald, J., andEisner, T. 1989. Paternal allocation of sequestered plant pyrrolizidine alkaloid to eggs in the danaine butterfly,Danaus gilippus. Experientia. 45:896–898.Google Scholar
- Eisner, T. 1988. Insekten als fürsorgliche Eltern.Verhandl Dtsch.Zool. Gesellsch. 81:9–17.Google Scholar
- Eisner, T., andEisner, M. 1991. Unpalatability of the pyrrolizidine alkaloid-containing mothUtetheisa ornatrix, and its larva, to wolf spiders.Psyche 98:111–118.Google Scholar
- Eisner, T., andMeinwald, J. 1987. Alkaloid-derived pheromones and sexual selection in Lepidoptera, pp. 251–269,in G.D. Prestwich and G.J. Blomquist (eds.). Pheromone Biochemistry. Academic Press, New York.Google Scholar
- Johnson, A.E., Molyneux, R.J., andMerill, G.B. 1985. Chemistry of toxic range plants. Variation in pyrrolizidine alkaloid content ofSenecio, Amisickia, andCrotalaria species.J. Agric. Food Chem. 33:50–55.Google Scholar
- Mattocks, A.R. 1969. Dihydropyrrolizine derivatives from unsaturated pyrrolizidine alkaloids.J. Chem. Soc. C. 1969:1155–1162.Google Scholar
- McCormick, J.P., andCarrel, J.E. 1987. Cantharidin biosynthesis and function in meloid beetles, pp. 307–350,in G.D. Prestwich and G.J. Blomquist (eds.). Pheromone Biochemistry. Academic Press, New York.Google Scholar
- Sokal, R.R., andRohlf, F.J. 1981. Biometry. W.H. Freeman Co., San Francisco.Google Scholar