The otolith-isotope method: an opportunity to examine field metabolic rate as an in situ indicator of climate change within and across juvenile Atlantic cod populations (Gadus morhua) ...

• Main Author: De Groot, Valesca
• Format: Text
• Language: English
• Published: Memorial University of Newfoundland 2023
• Subjects: atlantic cod; Gadus morhua
• Online Access: https://dx.doi.org/10.48336/fwna-pz97; https://research.library.mun.ca/15920/

Individual metabolism is a unifying variable in animal ecology, influencing all aspects of performance including growth rate, energetic efficiency, and mortality. As abiotic factors continue to fluctuate due to climate change and anthropogenic disturbance, it is becoming increasingly important to measure an individual's metabolic rate in its natural environment to assess critical energetic tradeoffs. Field metabolic rate (FMR) is the metabolic rate measured from a free-ranging organism, taking into account an individual’s specific dynamic action (SDA), standard metabolic rate (SMR), and activity, yielding a holistic estimate of energy intake and expenditure. Unlike with terrestrial animals, our knowledge of the physiological processes of fishes to date is largely based on extrapolation from observations of historic populations, or from laboratory-based measures of respiratory potential. Here, I describe a newly developed proxy for FMR which pairs the stable isotope composition of the otolith with estimates ...