Salmonids in hot water: are physiological constraints causing salmonids to die? (39820)

Project Details


To determine the effect of warmer water on salmonids I will answer the following questions: 1) Do populations of anadromous sockeye salmon and non-anadromous kokanee salmon (Oncorhynchus nerka) show intraspecific variability in their thermal tolerance across their distribution range? 2) Are differences in thermal tolerance associated with the environmental conditions to which populations are locally adapted? 3) Do differences in cardiorespiratory physiology drive sex-specific and size-specific mortality?

The project will combine a wide range of methodologies including whole animal respirometry (swim tunnels and static respirometers), cardiovascular measurements (cardiac output and heart rate), blood parameters (oxygen, pH, lactate) and cellular measurements (enzyme activity in cardiac, white and red muscle). Combined, these approaches will allow the determination of standard and maximum metabolic rates, cardiac performance, and provide insight into the capacity for oxygen delivery to tissues. Performed under different temperatures, these approaches also allow the determination of thermal limits. All methods will be used on sockeye and kokanee salmon from different populations across their distribution range. In the second year of study, physiological approaches will be combined with biotelemetry to link physiology to survival.

DTU Aqua, National Institute of Aquatic Resources (coordinator)
University of California Santa Barbara, United States of America

The project is funded by VILLUM FOUNDATION.

Research area: Freshwater Fisheries and Ecology
Effective start/end date01/01/202131/12/2023


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