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Summer Rearing Temperature and Westslope Cutthroat Trout

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Species Common Name
Westslope Cutthroat Trout
Latin Name (Genus species)
Oncorhynchus clarkii lewisi
Stressor Name
Summer rearing temperature
Specific Stressor Metric
July-August average stream temperature
Stressor Units
°C
Vital Rate (Process)
Survival

Life Stage

Season
Summer (July, August)
Activity
Rearing
Geography
Laboratory, Montana
Detailed SR Function Description
Westslope Cutthroat Trout inhabit primarily cold, high elevation watersheds where summer stream temperatures remain low. Summer stream temperatures may restrict the distribution of Westslope Cutthroat Trout through lethal or sublethal effects on growth, competition, and metabolism. Bear et al. (2007) compared the growth and survival of Westslope Cutthroat Trout and non-native Rainbow Trout in laboratory experiments. These experiments subjected fish to 60-days of temperatures from 8oC - 28oC. In these acclimated chronic exposure experiments, survival of fish under each temperature regime were monitored. The resultant data was fit to the follow logistic regression:
p=97.07681+e-((T-19.6253)/-0.6151)
Where T is the temperature that fish were held at for 60 days, and p is the survival probability.
Function Derivation
Empirical data; Experimental manipulation
Transferability of Function
This function was derived from laboratory experiments on wild stock Westslope Cutthroat Trout in Montana. It could be used on other populations of Westslope Cutthroat Trout with caution.
Source of stressor Data
This function has not yet been applied in a CEMPRA model. Recommended stressor magnitude data would reflect mean temperature during the two hottest months in each watershed.
Function Type
continuous
Stressor Scale
linear
Citation(s)
CEMPRA Team 2024. Relationship between stream temperatures and juvenile survival for Westslope Cutthroat Trout.

Bear, E.A., T.E. McMahon, A.V. Zale. 2007. Comparative Thermal Requirements of Westslope Cutthroat Trout and Rainbow Trout: Implications for Species Interactions and Development of Thermal Protection Standards. Trans. Am. Fish. Soc. 136: 1113-1121
File Upload
Westslope Cutthroat Trout - Summer Temperature Juvenile Survival CEMPRA SR Function (268.89 KB)
Westslope Cutthroat Trout - Summer Temperature Juvenile Survival SR function documentation (55.77 KB)
Images
Relationship between Westslope Cutthroat Trout survival and stream temperature from laboratory experiments (Bear et al. 2007).
Stressor Response csv data
Data_WSCT_summerTemp_juvSurvival.csv (397 bytes)
Temperature (7DADM) Survival SD low.limit up.limit
8 99.1 0 0 100
9 99.1 0 0 100
10 99.1 0 0 100
11 99.1 0 0 100
12 99.1 0 0 100
13 99.1 0 0 100
14 99.1 0 0 100
15 99.0 0 0 100
16 98.8 0 0 100
17 97.7 0 0 100
18 92.5 0 0 100
19 72.8 0 0 100
20 34.9 0 0 100
21 9.6 0 0 100
22 2.0 0 0 100
23 0.4 0 0 100
24 0.1 0 0 100
25 0.0 0 0 100
26 0.0 0 0 100
27 0.0 0 0 100
28 0.0 0 0 100

Stressor Response Chart