Iridoid glycosides in the nectar of Catalpa speciosa are unpalatable to nectar thieves

Andrew G. Stephenson

Research output: Contribution to journalArticle

69 Scopus citations

Abstract

The floral nectar of Catalpa speciosa has a chemical mechanism that limits thievery. A bioassay employing sphingid larvae, Ceratomia catalpae, shows that catalpa iridoid glycosides are present in the floral nectar. When potential nectar thieves are fed nectar, a sucrose solution of identical concentration, or a sucrose solution plus 0.4% catalpol and 0.4% catalposide (catalpa iridoids), the thieves drink significantly more of the pure sucrose solution than either of the other two sugar sources. Those thieves that drink either the nectar or the sucrose solution plus catalpa iridoids develop behavioral abnormalities including regurgitation and loss of locomotion. The response of the potential nectar thieves to nectar or the sucrose solution plus catalpa iridoids cannot be distinguished by the amount consumed or by their behavior. The legitimate diurnal pollinators of C. speciosa are not affected by the iridoid glycosides.

Original languageEnglish (US)
Pages (from-to)1025-1034
Number of pages10
JournalJournal of Chemical Ecology
Volume8
Issue number7
DOIs
StatePublished - Jul 1 1982

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Biochemistry

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