Data from: Migratory monarchs that encounter resident monarchs show life-history differences and higher rates of parasite infection

Dara A. Satterfield, John C. Maerz, Mark D. Hunter, D. T. Tyler Flockhart, Keith A. Hobson, D. Ryan Norris, Hillary Streit, Jacobus C. De Roode & Sonia Altizer
Environmental change induces some wildlife populations to shift from migratory to resident behaviours. Newly formed resident populations could influence the health and behaviour of remaining migrants. We investigated migrant-resident interactions among monarch butterflies and consequences for life history and parasitism. Eastern North American monarchs migrate annually to Mexico, but some now breed year-round on exotic milkweed in the southern U.S. and experience high infection prevalence of protozoan parasites. Using stable isotopes (2H, 13C) and cardenolide...
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