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. 2011 Feb 1;92(2):342–351. doi: 10.1890/10-0489.1

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© 2011 by the Ecological Society of America

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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figure image — Decreasing parasite prevalence (proportion of adult monarchs heavily infected, mean ± SE) for wild‐caught eastern North American migrating adult monarchs from three different locations (New Jersey, Georgia, and Florida, USA) along the eastern fall migratory flyway from 2006 to 2009 (N = 1917 adult monarchs). Sample sizes for each year and site combination are given. Sites are arranged (left to right) from relative northern to southern locations, and points are offset along the x‐axis for visualization.