- Data from: Genetic variation in HIF signaling underlies quantitative variation in physiological and life history traits within lowland butterfly populations(2012-10-26) Marden, James H.; Fescemyer, Howard W.; Schilder, Rudolf J.; Doerfler, William R.; Vera, Juan Cristobal; Wheat, Christopher W.; Pennsylvania State University - Marden, James H.; Pennsylvania State University - Fescemyer, Howard W.; Pennsylvania State University - Schilder, Rudolf J.; Pennsylvania State University - Doerfler, William R.; University of Helsinki - Wheat, Christopher W.