Custom (Lewis and Ganshorn 2007): HSI Overwinter Coho & Velocity
mbayly
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Species Common Name
Coho Salmon
Latin Name (Genus species)
Oncorhynchus kisutch
Stressor Name
Velocity
Specific Stressor Metric
Water Velocity
Stressor Units
m/s
Vital Rate (Process)
Habitat Suitability Index
Geography
British Columbia (composite)
Detailed SR Function Description
Generalized relationship from criteria in Lewis and Ganshorn (2007):
- Optimal (HSI = 1.0): 0.0 to 0.06 metres per second (m/s). The absolute peak preference sits at 0 cm/s (dead water). Juveniles utilize alcoves, side-channels, and complex root wads where they do not have to swim against a current.
- Marginal (HSI = 0.1 to 0.4): 0.07 to 0.20 m/s. At these speeds, juveniles expend more energy foraging than they consume due to a lower winter metabolism.
- Unsuitable (HSI = 0.0): Any velocities above 0.25 to 0.30 m/s are completely avoided. High winter currents can displace parr or smolts downstream, leading to high winter mortality rates.
- Optimal (HSI = 1.0): 0.0 to 0.06 metres per second (m/s). The absolute peak preference sits at 0 cm/s (dead water). Juveniles utilize alcoves, side-channels, and complex root wads where they do not have to swim against a current.
- Marginal (HSI = 0.1 to 0.4): 0.07 to 0.20 m/s. At these speeds, juveniles expend more energy foraging than they consume due to a lower winter metabolism.
- Unsuitable (HSI = 0.0): Any velocities above 0.25 to 0.30 m/s are completely avoided. High winter currents can displace parr or smolts downstream, leading to high winter mortality rates.
Function Derivation
Custom rule-based and expert opinion
Transferability of Function
Generalized assumptions
Function Type
continuous
Stressor Scale
linear
References Cited
Lewis, A. and K. Ganshorn. 2007. Literature Review of Habitat Productivity Models for Pacific Salmon Species. Consultant’s report prepared for the Department of Fisheries and Oceans, Habitat Management Division, Vancouver, B.C.
Citation Link
Stressor Response csv data
lg_velo.csv
(142 bytes)
| Stressor (X) | Mean System Capacity (%) | SD | low.limit | up.limit |
|---|---|---|---|---|
| 0 | 100 | 0 | 0 | 100 |
| 0.06 | 100 | 0 | 0 | 100 |
| 0.11 | 38 | 0 | 0 | 100 |
| 0.25 | 0 | 0 | 0 | 100 |
| 0.3 | 0 | 0 | 0 | 100 |
Stressor Response Chart
Mean Response
±1 Standard Deviation
Upper/Lower Limits