1818 JOURNAL OF THE LEPIDOPTERISTS’ SOCIETY Journal of the Lepidopterists’ Society 62(1), 2008, 18–30 RESPONSES OF NORTH AMERICAN PAPILIO TROILUS AND P. GLAUCUS TO POTENTIAL HOSTS FROM AUSTRALIA J. MARK SCRIBER Dept. Entomology, Michigan State University, East Lansing, MI 48824, USA; School of Integrative Biology, University of Queensland, Brisbane, Australia 4072; email:
[email protected] MICHELLE L. LARSEN School of Integrative Biology, University of Queensland, Brisbane, Australia 4072 AND MYRON P. Z ALUCKI School of Integrative Biology, University of Queensland, Brisbane, Australia 4072 ABSTRACT. We tested the abilities of neonate larvae of the Lauraceae-specialist, P. troilus, and the generalist Eastern tiger swallowtail, Papilio glaucus (both from Levy County, Florida) to eat, survive, and grow on leaves of 22 plant species from 7 families of ancient angiosperms in Australia, Rutaceae, Magnoliaceae, Lauraceae, Monimiaceae, Sapotaceae, Winteraceae, and Annonaceae. Clearly, some common Papilio feeding stimulants exist in Australian plant species of certain, but not all, Lauraceae. Three Lauraceae species (two introduced Cinnamomum species and the native Litsea leefeana) were as suitable for the generalist P. glaucus as was observed for P. troilus. While no ability to feed and grow was detected for the Lauraceae-specialized P. troilus on any of the other six ancient Angiosperm families, the generalist P. glaucus did feed successfully on Magnoliaceae and Winteraceae as well as Lauraceae. In addition, some larvae of one P. glaucus family attempted feeding on Citrus (Rutaceae) and a small amount of feeding was observed on southern sassafras (Antherosperma moschatum; Monimiaceae), but all P. glaucus (from 4 families) died on Annonaceae and Sapotaceae.