Plant latex and first-instar monarch larval growth and survival on three North American milkweed species

Citation
Mp. Zalucki et Sb. Malcolm, Plant latex and first-instar monarch larval growth and survival on three North American milkweed species, J CHEM ECOL, 25(8), 1999, pp. 1827-1842
Citations number
55
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
25
Issue
8
Year of publication
1999
Pages
1827 - 1842
Database
ISI
SICI code
0098-0331(199908)25:8<1827:PLAFML>2.0.ZU;2-Y
Abstract
First-instar larvae of the monarch butterfly, Danaus plexippus, a milkweed specialist, generally grew faster and survived better on leaves when latex flow was reduced by partial severance of the leaf petiole. The outcome depe nded on milkweed species and was related to the amount of latex produced. T he outcome also may be related to the amount of cardenolide produced by the plants as a potential chemical defense against herbivory. Growth was more rapid, but survival was similar on partially severed compared with intact l eaves of the high-latex/low-cardenolide milkweed, Asclepias syriaca, wherea s both growth and survival were unaffected on the low-latex/low-cardenolide milkweed A. incarnata. On the low-latex/low-cardenolide milkweed A. tubero sa, both growth and survival of larvae were only marginally affected. These results contrast sharply to previous results with the milkweed, A. humistr ata, in Florida, which has both high latex and high cardenolide. Larval gro wth and survival on A. humistrata were both increased by partially severing leaf petioles. Larval growth rates among all four milkweed species on leav es with partially severed petioles were identical, suggesting that latex an d possibly the included cardenolides are important in first-instar monarch larval growth, development, and survivorship.