Triangulating from the cairns…
Counts of montane Euphydryas editha along transects at Almont Summit, Colorado, show that males form a dense aggregation along a ridgetop with an estimated 30:1 (male:female) sex ratio. Fertilized females showed preference for subsites below the ridgetop at least as rich in oviposition plants but less rich in nectar resources, where the sex ratio was close to 1:1. Mark-release-recapture data suggest mating is less probable on the ridgetop than below it. This suggests the possibility that nonaggregating males, at least under conditions similar to those of 1983, may have greater reproductive success than those in aggregations, raising questions about the function of such aggregations.
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