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Sockeye Salmon – Thermal tolerance in different populations

Added after last sentence in the section titled ‘Canada’ is where this information should go:

A study done in 2011 by E. Eliason and his team revealed that one of the primary causes affecting the migration to the Fraser River is the increase in temperatures of the water over time and no sockeye salmon population at this time was able to migrate at a temperature above 21 degrees C. However, there is a species of sockeye salmon called the Chilko that have a higher resistance to the changing temperatures and are able to maintain their cardiorespiratory functions at higher temperatures which going forward, may be a favorable trait for selection. In support of the previous study mentioned, a study from The Journal of Comparative Physiology B-Biochemical Systems and Environmental Physiology discovered that an increased beta AR stimulation from juvenile sockeye salmon while swimming will allow them to have better adaptation at higher temperatures.

Citations:

Eliason EJ, Clark TD, Hague MJ, Hanson LM, Gallagher ZS, Jeffries KM, Gale MK, Patterson DA, Hinch SG, Farrell AP. Differences in thermal tolerance among sockeye salmon populations. Science. 2011 Apr 1;332(6025):109-12. doi: 10.1126/science.1199158. PMID: 21454790.

Goulding, A.T., Farrell, A.P. The effect of temperature acclimation on the force-frequency relationship and adrenergic sensitivity of the ventricle of two populations of juvenile sockeye salmon. J Comp Physiol B 190, 717–730 (2020). https://doi.org/10.1007/s00360-020-01299-w.