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.
journal_name
J Chem Ecoljournal_title
Journal of chemical ecologyauthors
Bogner F,Eisner Tdoi
10.1007/BF00987992subject
Has Abstractpub_date
1991-11-01 00:00:00pages
2063-75issue
11eissn
0098-0331issn
1573-1561journal_volume
17pub_type
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journal_title:Journal of chemical ecology
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journal_title:Journal of chemical ecology
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journal_title:Journal of chemical ecology
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