Temperature and predator-mediated regulation of plasma cortisol and brain gene expression in juvenile brown trout (<i>Salmo trutta</i>).

There was no significant effect of the predator or of the temperature × predator interaction term for any of these genes (Table 1 ). There was no significant effect of temperature (albeit marginally non-significant, Table 1 ) or predator presence for 5-HT1Aβ, but there was a statistically significant temperature × predator interaction effect (Table 1 ). 5-HT1Aβ mRNA levels were significantly lower in the 8 °C/burbot treatment compared to in the other three experimental treatments (Fig. 4 a).

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