Fig. 1

Ordination plot of the redundancy analysis (RDA). The RDA was constructed using gene expression (mRNA levels) and cortisol data from juvenile brown trout (Salmo trutta) (N = 79, see Table 3) subjected to two experimental treatments (water temperature and presence/absence of predatory burbot (Lota lota)). The two temperatures (3 and 8 °C) drive the variation on axis one and explain 11.4% of the total variation in the data. Axis two is driven by burbot presence/absence and explains 2.8% of the total variation. The position of each response variable in relation to the intersection of the two orthogonal axes indicates the direction of the positive correlation, whereas the distance between intersect and each variable describes the strength of the effect. Biplot arrows have been removed for clarity