Southern Monarchs do not Develop Learned Preferences for Flowers With Pyrrolizidine Alkaloids

Autor(es)

de Oliveira, Marina Vasconcelos ^[1] ; Trigo, Jose Roberto ^[2] ; Rodrigues, Daniela ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio de Janeiro, Inst Biol, Dept Ecol, Lab Interacoes Insetoplanta, Ilha Fundao, BR-21941902 Rio De Janeiro, RJ - Brazil

^[2] Univ Estadual Campinas, Dept Biol Anim, Inst Biol, Lab Ecol Quim, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Chemical Ecology; v. 41, n. 7, p. 662-669, JUL 2015.
• Citações Web of Science: 4

Resumo

Danaus butterflies sequester pyrrolizidine alkaloids (PAs) from nectar and leaves of various plant species for defense and reproduction. We tested the hypothesis that the southern monarch butterfly Danaus erippus shows innate preferences for certain flower colors and has the capacity to develop learned preferences for artificial flowers presenting advantageous floral rewards such as PAs. We predicted that orange and yellow flowers would be innately preferred by southern monarchs. Another prediction is that flowers with both sucrose and PAs would be preferred over those having sucrose only, regardless of flower color. In nature, males of Danaus generally visit PA sources more often than females, so we expected that males of D. erippus would exhibit a stronger learned preference for PA sources than the females. In the innate preference tests, adults were offered artificial non-rewarding yellow, orange, blue, red, green, and violet flowers. Orange and yellow artificial flowers were most visited by southern monarchs, followed by blue and red ones. No individual visited either green or violet flowers. For assessing learned preferences for PA flowers over flowers with no PAs, southern monarchs were trained to associate orange flowers with sucrose plus the PA monocrotaline vs. yellow flowers with sucrose only; the opposite combination was used to train another set of butterflies. In the tests, empty flowers were offered to trained butterflies. Neither males nor females showed learned preferences for flower colors associated with PAs in the training set. Thus, southernmonarchs resemble the sister species Danaus plexippus in their innate preferences for orange and yellow flowers. Southern monarchs, similarly to temperate monarchs, might not be as PA-demanding as are other danaine species. (AU)

• Processo FAPESP: 11/17708-0 - Defesas químicas em plantas e insetos neotropicais
• Beneficiário: Jose Roberto Trigo
• Linha de fomento: Auxílio à Pesquisa - Regular