Oxygen consumption of juvenile brown trout, Salmo trutta, under varying thermal conditions during embryogenesis

Climate change is predicted to increase the future thermal conditions in northern latitudes with the potential effect of altering the metabolic scope and potential fitness of aquatic ectotherms. We experimentally tested the effect of elevated egg incubation temperature on the metabolic scope in juvenile brown trout (Salmo trutta). Brown trout cohorts from anadromous and resident crosses were raised from egg through exogenous feeding of juveniles in either natural river temperatures (cold) or elevated (+ 3 °C, warm) temperatures. In respirometry studies, we measured oxygen consumption rates of juvenile trout from both incubation temperatures and all possible breeding crosses after they were feeding exogenously and at an ambient temperature of 13 °C. These measures were taken over a period where the trout were resting, allowing for the determination of standard metabolic rate (SMR), and followed by a chase to exhaustion allowing for the measure of the maximum metabolic rate (MMR).  The ae...