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The copepod Calanus finmarchicus is a key component of northern Atlantic food webs, linking energy-transfer from phytoplankton to higher trophic levels. We examined the effect of different ocean acidification (OA) scenarios (i.e., ambient, 1080, 2080, and 3080 μatm CO₂) over two subsequent generations under limited food availability. Determination of metabolic and feeding rates, and estimations of the scope for growth, suggests that negative effects observed on vital rates (ontogenetic development, somatic growth, fecundity) may be a consequence of energy budget constraints due to higher maintenance costs under high pCO₂-environments. A significant delay in development rate among the parental generation animals exposed to 2080 μatm CO₂, but not in the following F₁ generation under the same conditions, suggests that C. finmarchicus may have adaptive potential to withstand the direct long-term effects …