Researchers Rebecca A. Bartel and Sonia Altizer of the University of Georgia, Jaap de Roode of Emory University, and Karen Oberhauser have recently used MLMP and MonarchHealth breeding season data to arrive at this phenomena of OE parasite population density vs. length of migration finding. In two out of three years examined, parasite prevalence dropped between its peak in the final summer breeding phase and the butterflies' wintering period in Mexico. As the monarchs migrated south, the proportion of insects carrying heavy parasite loads kiminished. Their conclusion is that migration provides an opportunity to escape from habitats that might build up levels of diseases, and also to cull out susceptible individuals. This research is published in the journal Ecology.
DR. RYAN NORRIS WITH MONARCH RESEARCH
MONARCHS CROSS APPALACHIANS TO POPULATE EAST COAST OF U.S.
MONARCH POPULATIONS WAY DOWN FROM LAST YEAR: WAYSTATION NO. 613
CREATE A MONARCH WAYSTATION IN YOUR YARD
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