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Corpus Systématique Animale

Titre du document

Variation in cardenolide content of the lygaeid bugs, Oncopeltus fasciatus and Lygaeus kalmii kalmii and of their milkweed hosts ( Asclepias spp.) in central California

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Springer (journals)
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Mots-clés d'auteur
  • Variation in cardenolides
  • Oncopeltus fasciatus
  • Lygaeus kalmii kalmii
  • milkweeds
  • Asclepias
  • chemical defense
Nom du fichier dans la ressource
  • M. B. Isman 1
  • S. S. Duffey 2
  • G. G. E. Scudder 1
  • 1) Department of Zoology, University of British Columbia, V6T 1W5, Vancouver, Canada
  • 2) Department of Entomology, University of California, 95616, Davis, California

A colorimetric assay was used to quantify the amount of cardenolides in the lygaeid bugsOncopeltus fasciatus andLygaeus kalmii kalmii and their milkweed host plants (Asclepias spp.) in central California. The cardenolide content of individual insects, determined in microgram equivalents of digitoxin, varied from zero to over 300 ?g per insect. Sources of variation of cardenolide content in the insects include interspecific and intraspecific differences in the content of the host plant species and also differences in the content of plant organs on which insects were feeding. This last source of variability may explain temporal variation in the cardenolide content of the insects. Adults ofO. fasciatus, which migrate into California in the late spring and early summer, and adults ofL. k. kalmii, which emerge from winter hibernacula in the early spring, contained small to immeasureable amounts of cardenolides. The colonization pattern ofO. fasciatus on species ofAsclepias in north central California suggests that this species does not maximize its opportunities to sequester large quantities of cardenolides from potential hosts. The emetic potential of lygaeids in California to vertebrate predators is briefly discussed.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - entomology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - psychologie. psychophysiologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Biochemistry
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
  • 1 - Health Sciences ; 2 - Medicine ; 3 - General Medicine
Catégories WoS
  • 1 - science ; 2 - ecology
  • 1 - science ; 2 - biochemistry & molecular biology
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Journal of Chemical Ecology

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  • Insectes
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