Stream Temperature and Coho Salmon Summer Rearing Capacity
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Species Common Name
Coho Salmon
Latin Name (Genus species)
Oncorhynchus kisutch
Stressor Name
Temperature
Specific Stressor Metric
Stream Temperature
Stressor Units
°C
Vital Rate (Process)
Capacity
Detailed SR Function Description
The functional relationship between the summer rearing capacity and the 7-day average daily maximum stream temperature for coho salmon.
Increasing stream temperature decreases coho salmon abundance and productivity via changes in summer rearing capacity and productivity. We estimate the productivity multiplier based on 7-day average daily maximum (7-DADM) stream temperature which decreases summer rearing productivity from its base value:
T < 18°C, 1
18°C ≤ T < 24°C, 1 - 0.17*(T - 18)
T ≥ 24°C, 0
That is, at temperatures <18°C, the multiplier is 1, so there is no change in summer rearing productivity. From 18°C to 24°C, the multiplier decreases linearly from 1 to 0, and above 24°C the multiplier is 0 (Figure I.3) (based on ASEP 2014, Appendix C). We use the same multiplier for capacity that we use for productivity.
Increasing stream temperature decreases coho salmon abundance and productivity via changes in summer rearing capacity and productivity. We estimate the productivity multiplier based on 7-day average daily maximum (7-DADM) stream temperature which decreases summer rearing productivity from its base value:
T < 18°C, 1
18°C ≤ T < 24°C, 1 - 0.17*(T - 18)
T ≥ 24°C, 0
That is, at temperatures <18°C, the multiplier is 1, so there is no change in summer rearing productivity. From 18°C to 24°C, the multiplier decreases linearly from 1 to 0, and above 24°C the multiplier is 0 (Figure I.3) (based on ASEP 2014, Appendix C). We use the same multiplier for capacity that we use for productivity.
Function Derivation
expert opinion
Function Type
continuous
Stressor Scale
linear
Citation(s)
Beechie, T. J., C. Nicol, C. Fogel, J. Jorgensen, J. Thompson, G. Seixas, J. Chamberlin, J. Hall, B. Timpane-Padgham, P. Kiffney, S. Kubo, and J. Keaton. 2021. Modeling Effects of Habitat Change and Restoration Alternatives on Salmon in the Chehalis River Basin Using a Salmonid Life-Cycle Model. U.S. Department of Commerce, NOAA Contract Report NMFS-NWFSC-CR-2021-01.
Citation Link
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sr_curve (19)_0.csv
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Stressor Response csv data
sr_curve (19).csv
(106 bytes)
| Stressor (X) | Mean System Capacity (%) | SD | low.limit | up.limit |
|---|---|---|---|---|
| 8 | 1 | 0 | 0 | 0 |
| 18 | 1 | 0 | 0 | 0 |
| 24 | 0 | 0 | 0 | 0 |
| 32 | 0 | 0 | 0 | 0 |
Stressor Response Chart