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• W2904461658 abstract "Abstract Environmental change has the potential to influence trophic interactions by altering the defensive phenotype of prey. Here, we examine the effects of a pervasive environmental change driver, elevated atmospheric concentrations of CO 2 (eCO 2 ), on toxin sequestration and flight morphology of a specialist herbivore. We fed monarch butterfly larvae, Danaus plexippus , foliage from four milkweed, Asclepias , species of varying chemical defence profiles grown under either ambient or eCO 2 . We also infected a subset of these herbivores with a protozoan parasite, Ophryocystis elektroscirrha , to understand how infection and environmental change combine to alter herbivore defences. We measured changes in phytochemistry induced by eCO 2 and assessed cardenolide, toxic steroid, sequestration and wing morphology of butterflies. Monarchs compensated for lower plant cardenolide concentrations under eCO 2 by increasing cardenolide sequestration rate, maintaining similar cardenolide composition and concentrations in their wings under both CO 2 treatments. We suggest that these increases in sequestration rate are a by‐product of compensatory feeding aimed at maintaining a nutritional target in response to declining dietary quality under eCO 2 . Monarch wings were more suitable for sustained flight (more elongated) when reared on plants grown under eCO 2 or when reared on Asclepias syriaca or Asclepias incarnata rather than on Asclepias curassavica or Asclepias speciosa . Parasite infection engendered wings less suitable for sustained flight (wings became rounder) on three of four milkweed species. Wing loading (associated with powered flight) was higher on A. syriaca than on other milkweeds, whereas wing density was lower on A. curassavica . Monarchs that fed on high cardenolide milkweed developed rounder, thinner wings, which are less efficient at gliding flight. Ingesting foliage from milkweed high in cardenolides may provide protection from enemies through sequestration yet come at a cost to monarchs manifested as lower quality flight phenotypes: rounder, thinner wings with lower wing loading values. Small changes in morphology may have important consequences for enemy evasion and migration success in many animals. Energetic costs associated with alterations in defence and morphology may, therefore, have important consequences for trophic interactions in a changing world. A plain language summary is available for this article." @default.
• W2904461658 created "2018-12-22" @default.
• W2904461658 creator A5033401748 @default.
• W2904461658 creator A5055203034 @default.
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• W2904461658 creator A5083051547 @default.
• W2904461658 date "2019-01-11" @default.
• W2904461658 modified "2023-10-12" @default.
• W2904461658 title "Phytochemical changes in milkweed induced by elevated CO ₂ alter wing morphology but not toxin sequestration in monarch butterflies" @default.
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• W2904461658 doi "https://doi.org/10.1111/1365-2435.13270" @default.
• W2904461658 hasPublicationYear "2019" @default.
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