title: Differential effects of food availability on minimum and maximum rates of metabolism.
abstract: Metabolic rates reflect the energetic cost of living but exhibit remarkable variation among conspecifics, partly as a result of the constraints imposed by environmental conditions. Metabolic rates are sensitive to changes in temperature and oxygen availability, but effects of food availability, particularly on maximum metabolic rates, are not well understood. Here, we show in brown trout (Salmo trutta) that maximum metabolic rates are immutable but minimum metabolic rates increase as a positive function of food availability. As a result, aerobic scope (i.e. the capacity to elevate metabolism above baseline requirements) declines as food availability increases. These differential changes in metabolic rates likely have important consequences for how organisms partition available metabolic power to different functions under the constraints imposed by food availability.
authors.affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK sonya.auer@gmail.com.
authors.forename: Sonya K
authors.identifier: 0000-0002-2604-1535
authors.initials: SK
authors.lastname: Auer
authors.affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK.
authors.forename: Karine
authors.initials: K
authors.lastname: Salin
authors.affiliation: Institute of Environmental Sciences, Jagiellonian University, Krakow, Poland.
authors.forename: Agata M
authors.initials: AM
authors.lastname: Rudolf
authors.affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK.
authors.forename: Graeme J
authors.initials: GJ
authors.lastname: Anderson
authors.affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK.
authors.forename: Neil B
authors.initials: NB
authors.lastname: Metcalfe
mesh_terms: D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001481:Basal Metabolism; D004734:Energy Metabolism; D005502:Food; D014337:Trout / Q000378:metabolism*
keywords: Salmo trutta; energy metabolism; metabolic power; plasticity; standard metabolic rate