title: Ecological chemistry and the palatability spectrum.
abstract: A new bioassay for comparing the palatability to avian predators of monarch butterflies reared on various asclepiadaceous food plants containing cardiac glycosides indicates a palatability spectrum. The monarchs reared on one plant species are six times as emetic as those fed another, while those raised on an asclepiad which lacks cardiac glycosides are not emetic at all.
authors.forename: L P
authors.initials: LP
authors.lastname: Brower
authors.forename: W N
authors.initials: WN
authors.lastname: Ryerson
authors.forename: L L
authors.initials: LL
authors.lastname: Coppinger
authors.forename: S C
authors.initials: SC
authors.lastname: Glazier