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Drosophila (fruit flies) have generation times of 10-12 days, so seasonal changes in humidity and other environmental conditions can drive seasonal fluctuations in chromosome rearrangements in species such as D. persimilis and D. subobscura Drosophila body size (for which wing centroid size serves as a proxy measure) correlates with reproductive fitness. Banu Şebnem Önder and Cansu Fidan Aksoy measured the wing sizes of members of a D. melanogaster population in Yeşilöz. Turkey, that were collected monthly between May and October over three years. Their research suggests that Drosophila collected in relatively warmer months should tend to have greater reproductive fitness, as is illustrated by the finding that