Why do larvae of Utetheisa ornatrix penetrate and feed in pods of Crotalaria species? Larval performance vs. chemical and physical constraints

dc.creatorFerro, VG
dc.creatorGuimaraes, PR
dc.creatorTrigo, JR
dc.date2006
dc.dateOCT
dc.date2014-11-18T10:33:59Z
dc.date2015-11-26T17:49:23Z
dc.date2014-11-18T10:33:59Z
dc.date2015-11-26T17:49:23Z
dc.date.accessioned2018-03-29T00:32:26Z
dc.date.available2018-03-29T00:32:26Z
dc.identifierEntomologia Experimentalis Et Applicata. Blackwell Publishing, v. 121, n. 1, n. 23, n. 29, 2006.
dc.identifier0013-8703
dc.identifierWOS:000240402500003
dc.identifier10.1111/j.1570-8703.2006.00450.x
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/72877
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/72877
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/72877
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1289363
dc.descriptionLarvae of Utetheisa ornatrix (L.)(Lepidoptera: Arctiidae) are found mainly inside unripe pods of several alkaloid-bearing Crotalaria (Fabaceae) species. Although eggs are laid on the leaves, the larvae are usually found feeding on unripe seeds in the pods. In this work, we investigated the selective pressures that could explain why U. ornatrix larvae feed primarily on unripe pods with seeds and not on leaves. Our results showed that larval survivorship in the laboratory was unaffected by feeding on leaves or unripe seeds, and that larval development up to the pupal stage was better in larvae that fed on unripe seeds, although perforating unripe pods to reach seeds was costly in terms of survivorship. Females were also heavier when fed on unripe seeds, but there was no significant difference in the fecundity of females fed either of the two diets. Feeding on unripe seeds in pods had other benefits for U. ornatrix, including a lower predation rate for larvae that fed inside compared to larvae that fed outside the pods. Similarly, adults derived from larvae that fed on unripe seeds were preyed upon less frequently by the orb-weaving spider Nephila clavipes than were adults that fed on leaves. The latter benefit may be closely related to the high concentration of pyrrolizidine alkaloids in unripe seeds, which is about five times more than in leaves. These alkaloids are sequestered by the larvae and transferred to adults, which then become chemically protected. However, this chemical defence does not protect the larvae against ants such as Ectatomma quadridens and Camponotus crassus. Pods with unripe seeds that confer physical protection to larvae and pyrrolizidine alkaloids that confer chemical protection to adults limit the use of leaves by U. ornatrix larvae.
dc.description121
dc.description1
dc.description23
dc.description29
dc.languageen
dc.publisherBlackwell Publishing
dc.publisherOxford
dc.publisherInglaterra
dc.relationEntomologia Experimentalis Et Applicata
dc.relationEntomol. Exp. Appl.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectants
dc.subjectArctiidae
dc.subjectCamponotus crassus
dc.subjectchemical defence
dc.subjectCrotalaria pallida
dc.subjectEctatomma quadridens
dc.subjectFabaceae
dc.subjectLepidoptera
dc.subjectNephila clavipes
dc.subjectphysical defence
dc.subjectpyrrolizidine alkaloids
dc.subjectOrb-weaving Spider
dc.subjectPyrrolizidine Alkaloids
dc.subjectIthomiine Butterflies
dc.subjectDefense-mechanisms
dc.subjectArctiid Moth
dc.subjectNephila-clavipes
dc.subjectChemistry
dc.subjectLepidoptera
dc.subjectArthropods
dc.subjectEggs
dc.titleWhy do larvae of Utetheisa ornatrix penetrate and feed in pods of Crotalaria species? Larval performance vs. chemical and physical constraints
dc.typeArtículos de revistas


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