Variation in the field metabolic rate of wild living plaice )Pleuronectes platessa) from the North Sea constraining inluences of body size......

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The physiological responses of individual organisms drive ecosystem change prompted bywarming sea temperatures. Although critical in predicting population responses to climate change,the extent to which individuals are able to mitigate temperature effects by modifying behaviourand metabolic response is unknown. Metabolic scope is the difference between an organism'sstandard and maximum metabolic rate. For a given median water temperature, metabolic scopemay be increased behaviourally by reducing total (field) metabolic rate (FMR) by seeking colderwater, by foraging less or by reducing growth. Intra-population metabolic scope may also vary dueto differences in basal metabolic rate. The extent to which populations maintain the capacity tovary metabolic scope is an unknown but critical concept for predicting species' responses toclimate change. Measuring marine fishes' FMR in natural habitats is a major scientific challengecurrently limiting predictions of fish physiological responses to climate change. Using a newbiogeochemical proxy for FMR based on otolith stable carbon isotope composition, we will explorethe metabolic response of individual fish to decadal temperature change using the Cefas otolitharchive. Focusing initially on plaice, we will for the first time describe spatial and temporaldifferences in FMR plasticity across a species thermal range.