Table 1. Effects of temperature, sex and date on the body weight of O. cornuta and O. bicornis.

We provided three different temperature treatments (warm vs. medium vs. cold overwintering temperature treatment). Body weight was corrected for body size [mg/mm²]. Non-significant predictors (p > 0.05) were removed from the model in a manual stepwise model selection.

	O. cornuta				O. bicornis
	Df	F	p		Df	F	p
Body weight during winter [mg/mm2]				Body weight during winter [mg/mm2]
Temperature	2	2.33	0.099	Temperature	2	1.66	0.19
Sex	1	98.87	<0.001	Sex	1	87.53	<0.001
Date	1	414.96	<0.001	Date	1	397.40	<0.001
Temperature : Date	2	4.46	0.013	Temperature : Date	2	9.74	<0.001