Fig. 1From: The influence of immune challenges on the mean and variance in reproductive investment: a meta-analysis of the terminal investment hypothesisConceptual model depicting individual terminal investment response varying according to the level of perceived survival threat, leading to potential changes in mean and variance. Each thin continuous line represents a single individual’s reproductive investment as survival threat changes. Vertical dashed lines represent levels of threat where different effects on trait mean or variance can be observedBack to article page