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Altered precipitation patterns are a major prediction of climate change models and a recent reality. Changes in climatic variables may affect the evolution of species by affecting the magnitude and direction of natural selection on various traits. Winter precipitation can affect summer-flowering plants by altering the date of snowmelt. By investigating a long-term record of floral and vegetative traits and corresponding fitness in a hybrid zone between two species of subalpine wildflowers, a strong relationship was found between snowmelt date and the strength of selection on corolla length. For other traits, variation in selection could be attributed to pollinator abundances. In addition, a plastic response to winter precipitation was found in specific leaf area, a trait that plants use to balance water usage and carbon acquisition.
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