Journal of Chemical Ecology

, Volume 9, Issue 4, pp 521–532

Cardenolide sequestration by the dogbane tiger moth (Cycnia tenera; Arctiidae)

Authors

  • James A. Cohen
    • Department of ZoologyUniversity of Florida
  • Lincoln P. Brower
    • Department of ZoologyUniversity of Florida
Article

DOI: 10.1007/BF00990224

Cite this article as:
Cohen, J.A. & Brower, L.P. J Chem Ecol (1983) 9: 521. doi:10.1007/BF00990224

Abstract

Cycnia tenera adults, reared as larvae onAsclepias humistrata, had 10 times higher cardenolide concentrations, and contained 15 times more total cardenolide, than did moths reared onA. tuberosa. Thin-layer chromatography confirmed that each individual cardenolide visualized in the adult moths reared on the former host plant corresponds to one present in the plant, thus demonstrating that the insects' cardenolides are indeed derived from the larval food. Adult weights were significantly greater when the larvae had been fed upon the higher cardenolide plant species,A. humistrata. Similar results for other milkweed-feeding insects have been interpreted by some authors as evidence against a metabolic cost of handling cardenolides. However, such interpretations confound cardenolide differences among milkweed species with other differences in plant primary and secondary chemistry that affect insect growth and development. While the cooccurrence inC. tenera of other noxious chemicals (e.g., alkaloids) is not precluded, cardenolides sequestered from larval host plants have probably contributed to the evolution of visual and auditory aposematism in this species. As the eggs are laid in large clutches and larvae are gregarious, such aposematism may have evolved via kin selection.

Key words

Cycnia teneraArctiidaeLepidopteraAsclepiasmilkweedscardenolidescardiac glycosidesallelochemicsplant-insect interactionsplant secondary chemistrychemical ecologychemical defensekin selection

Copyright information

© Plenum Publishing Corporation 1983