Figure 3. Influence of temperature and head size on the Julian date of emergence of (A) O. cornuta males, (B) O. bicornis males, (C) O. cornuta females and (D) O. bicornis females.

We compared three different temperature treatments (orange: warm, purple: medium, blue: cold overwintering temperature treatment). Small points show the raw data. Regression lines represent the results of general linear models. Bold points show the mean head size and the mean Julian date of emergence of each temperature treatment. Julian date 100 = 10th of April.