Abstract
Distributions of the host plants of mobile herbivorous insects form complex mosaics in space and time. Thus it is difficult to track large scale patterns of herbivorous insect movement without time-and labour-intensive trapping, tracking, and marking techniques that are subject to misinterpretation. Here we summarize the use of a chemical fingerprinting technique to describe the continental scale pattern of migration by the monarch butterfly (Danaus plexippus (L.)) in relation to the spatial and temporal distributions of its milkweed larval host plants (Asclepias spp.) in North America.
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