Figure 2 – Association between DHA in trout tissues and the brain volume (a), brain morphology PC1 [PC1 was positively related to the volume of olfactory bulb, and hypothalamus and negatively related to cerebellum and optic tectum] (b) and brain morphology PC2 [PC2 was positively related to the volume of telencephalon] (c). Colours of datapoints, fit lines and box plots displaying distribution of each variable correspond to AF – allopatric females (red), AM – allopatric males (green), SF - sympatric females (cyan), and SM – sympatric males (purple). All variables are residuals controlled for the fork length of individuals.