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Aerobic scope increases throughout an ecologically relevant temperature range in coho salmon
Graham D Raby1, Matthew T Casselman2, Steven J Cooke3
1Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Carleton University, Ottawa, Ontario, Canada K1S 5B6 graham.d.raby@gmail.com.
The Journal of Experimental Biology
|April 10, 2016
Summary
Aerobic scope (AS) in coho salmon did not peak at historically relevant temperatures. This suggests AS alone may not fully predict thermal optima for Pacific salmon under climate change.
Area of Science:
- Physiological ecology
- Aquatic ectotherm thermal biology
Background:
- Aerobic scope (AS) predicts aquatic ectotherm thermal niches and fitness under warming.
- Salmonid AS curves vary, with some peaking at migration temperatures and others showing an upward trend.
Purpose of the Study:
- To test if peak AS in coho salmon aligns with historical river temperatures.
- To investigate AS across ecologically relevant temperatures for adult and juvenile coho salmon.
Main Methods:
- Assessed adult coho salmon AS at 10°C and 15°C.
- Analyzed published juvenile coho salmon AS data with new temperature measurements.
Main Results:
- AS in both adult and juvenile coho salmon was maintained or increased across relevant temperatures.
- Peak AS did not consistently coincide with historically experienced river temperatures.
Conclusions:
- AS is a useful indicator of oxygen transport capacity but may not solely determine thermal optima.
- Other physiological performance metrics are needed alongside AS to understand thermal optima for Pacific salmon across life stages.
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