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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.<\/jats:p>","DOI":"10.1126\/science.177.4047.426","type":"journal-article","created":{"date-parts":[[2006,10,5]],"date-time":"2006-10-05T14:03:38Z","timestamp":1160057018000},"page":"426-429","source":"Crossref","is-referenced-by-count":123,"title":["Variation in Cardiac Glycoside Content of Monarch Butterflies from Natural Populations in Eastern North America"],"prefix":"10.1126","volume":"177","author":[{"given":"Lincoln P.","family":"Brower","sequence":"first","affiliation":[{"name":"Department of Biology, Amherst College, Amherst, Massachusetts 01002"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter B.","family":"McEvoy","sequence":"additional","affiliation":[{"name":"Department of Biology, Amherst College, Amherst, Massachusetts 01002"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenneth L.","family":"Williamson","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Mount Holyoke College, South Hadley, Massachusetts 01075"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maureen A.","family":"Flannery","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Mount Holyoke College, South Hadley, Massachusetts 01075"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_2_1_1_1","first-page":"193","volume":"5","year":"1953","unstructured":"BORISON, H.L., PHYSIOLOGY AND PHARMACOLOGY OF VOMITING, PHARMACOLOGICAL REVIEWS 5: 193 (1953).","journal-title":"PHARMACOLOGICAL REVIEWS"},{"key":"e_1_2_1_2_1","first-page":"69","year":"1970","unstructured":"Brower, L. 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