Variation in Cardiac Glycoside Content of Monarch Butterflies from Natural Populations in Eastern North America
- 4 August 1972
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 177 (4047) , 426-429
- https://doi.org/10.1126/science.177.4047.426
Abstract
A new spectrophotometric assay has been used to determine the gross concentration of cardiac glycoside in individual monarch butterflies. Adults sampled during the fall migration in four areas of eastern North America exhibited a wide variation in cardiac glycoside concentration. The correlation between spectrophotometrically measured concentrations and emetic dose determinations supports the existence of a broad palatability spectrum in wild monarch butterflies. The cardiac gylcoside concentration is greater in females than in males and is independent of the dry weight of the butterflies; contrary to prediction, both the concentration mean and variance decrease southward. The defensive advantage of incorporating cardiac glycosides may be balanced by detrimental effects on individual viability.Keywords
This publication has 8 references indexed in Scilit:
- Cardenolides in the Milkweed Plant and Feetling by the Milkweed Bug1Annals of the Entomological Society of America, 1971
- THEORETICAL INVESTIGATIONS OF AUTOMIMICRY, I. SINGLE TRIAL LEARNINGProceedings of the National Academy of Sciences, 1970
- Cardiac Glycosides and Distastefulness: Some Observations on the Palatability Spectrum of ButterfliesScience, 1970
- Ecological ChemistryScientific American, 1969
- Ecological Chemistry and the Palatability SpectrumScience, 1968
- Plant poisons in a terrestrial food chain.Proceedings of the National Academy of Sciences, 1967
- The North American Species of Asclepias L.Annals of the Missouri Botanical Garden, 1954
- Ueber Synthesen in der BiphenylreiheEuropean Journal of Inorganic Chemistry, 1901