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• W2804524388 abstract "Metabolic rates vary widely within species, but little is known about how variation in the 'floor' [i.e. standard metabolic rate (SMR) in ectotherms] and 'ceiling' [maximum metabolic rate (MMR)] for an individual's aerobic scope (AS) are linked with digestive and locomotor function. Any links among metabolic traits and aspects of physiological performance may also be modulated by fluctuations in food availability. This study followed changes in SMR, MMR, and digestive and locomotor capacity in southern catfish (Silurus meridionalis) throughout 15 days of food deprivation and 15 days of refeeding. Individuals downregulated SMR during food deprivation and showed only a 10% body mass decrease during this time. Whereas critical swim speed (Ucrit) was robust to food deprivation, digestive function decreased after fasting with a reduced peak oxygen uptake during specific dynamic action (SDA) and prolonged SDA duration. During refeeding, individuals displayed rapid growth and digestive function recovered to pre-fasting levels. However, refed fish showed a lower Ucrit than would be expected for their increased body length and in comparison to measures at the start of the study. Reduced swimming ability may be a consequence of compensatory growth: growth rate was negatively correlated with changes in Ucrit during refeeding. Southern catfish downregulate digestive function to reduce energy expenditure during food deprivation, but regain digestive capacity during refeeding, potentially at the cost of decreased swimming performance. The plasticity of maintenance requirements suggests that SMR is a key fitness trait for in this ambush predator. Shifts in trait correlations with food availability suggest that the potential for correlated selection may depend on context." @default.
• W2804524388 created "2018-06-01" @default.
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• W2804524388 date "2018-01-01" @default.
• W2804524388 modified "2023-10-18" @default.
• W2804524388 title "Digestive and locomotor capacity show opposing responses to changing food availability in an ambush predatory fish" @default.
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• W2804524388 doi "https://doi.org/10.1242/jeb.173187" @default.
• W2804524388 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6031316" @default.
• W2804524388 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29636411" @default.
• W2804524388 hasPublicationYear "2018" @default.
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