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Population Differentiation in Euphydryas editha Butterflies: Larval Adaptation to Different Hosts

Mark D. Rausher
Evolution
Vol. 36, No. 3 (May, 1982), pp. 581-590
DOI: 10.2307/2408102
Stable URL: http://www.jstor.org/stable/2408102
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Population Differentiation in Euphydryas editha Butterflies: Larval Adaptation to Different Hosts
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Abstract

Evidence from laboratory rearing experiments on two populations of the checkerspot butterfly Euphydryas editha that use different host species indicate that the populations differ in characteristics associated with adaptation of larvae to growth on their food plants. Larvae from each population grow relatively faster and survive better when grown on their own primary host species than do larvae from the other population when grown on the same species. This pattern of specialization is not caused by differences in feeding behavior, but appears to be due to differences in digestive physiology.

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