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Effects of frost on wildflowers: an unexpected consequence of climate change--image 20 of 22A Mormon fritillary butterfly (Speyeria mormonia) visiting flowers of the fleabane daisy (Erigeron speciosus), an important and preferred nectar resource. Flower buds of E. speciosus are frost-sensitive. Egg production of female S. mormonia butterflies is limited by the amount of nectar they can collect (which is unusual for butterflies). Therefore, spring frosts that kill E. speciosus flowers impair reproduction in the fritillary butterfly.
The work on butterfly populations was done by Dr. Carol Boggs from Stanford University. She had not published the results of her 9-year study because she couldn't figure out why the butterfly populations were so variable. She happened to mention the study, and the fact that the butterflies relied heavily on E. speciosus flowers, to David Inouye, who replied that he had long-term data on the flowers. The resulting collaboration resulted in a publication that links the impact of climate change on the plants to the population biology of the butterflies. One benefit of working at a field station is that unexpected collaborations can arise, as did this one involving the butterfly and flower datasets.
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