Beecher 2002: HSI Coho Juvenile Depth
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Species Common Name
Coho Salmon
Latin Name (Genus species)
Oncorhynchus kisutch
Stressor Name
Depth
Specific Stressor Metric
Water Depth (total depth)
Stressor Units
m
Vital Rate (Process)
Habitat Suitability Index
Geography
Pacific Northwest
Key Covariates and Dependencies
fine-to-coarse gravel configurations (2 mm to 64 mm)
Small- to medium-sized wadeable streams
gravel-bed pool-riffle sequences
Detailed SR Function Description
Recommended juvenile (summer rearing) Coho Salmon depth preference curve from Beecher et al. (2002), adopted in the WDFW–Ecology instream flow guidelines. Suitability is 0 in very shallow water (≤0.03 m), rises to 0.90 by ~0.47 m, is optimal between ~0.76 and 0.99 m, and drops to 0.27 beyond ~1.2 m. Depths converted from feet to metres; the 99 ft terminal value (0.27) is omitted, so the last value (0.27 at 1.22 m) should be held for deeper water. Companion to the Beecher 2002 juvenile velocity curve (Figure 5b).
Stressor-response relationship data sourced from: FIGURE 5a. Coho Salmon Juvenile Depth Preference, Dungeness, Satsop Rivers and Kennedy Creek (4 studies, 451 fish) (Beecher et al. 2002) — Recommended depth preference curve (p. 45).
Stressor-response relationship data sourced from: FIGURE 5a. Coho Salmon Juvenile Depth Preference, Dungeness, Satsop Rivers and Kennedy Creek (4 studies, 451 fish) (Beecher et al. 2002) — Recommended depth preference curve (p. 45).
Function Derivation
Empirical frequency-of-use (use/availability) data, smoothed into a recommended curve.
Transferability of Function
Western Washington streams; frequency-based curves may not reflect habitat quality at high fish densities.
Source of stressor Data
Snorkel observations of juvenile coho microhabitat use (4 studies, 451 fish) relative to measured habitat availability.
Function Type
continuous
Stressor Scale
linear
References Cited
Beecher, H. A., Carleton, B. A., & Fricke, T. F. (2002). Evaluation of depth and velocity preferences of juvenile coho salmon in Washington streams. Northwest Science, 76(4), 314–325.
Citation Link
Images
Stressor Response csv data
Beecher 2002 HSI Coho Juvenile Depth.csv
(205 bytes)
| Raw Stressor Values | Scaled Response Values 0 to 100 | SD | low.limit | up.limit |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 100 |
| 0.03 | 0 | 0 | 0 | 100 |
| 0.076 | 25 | 0 | 0 | 100 |
| 0.472 | 90 | 0 | 0 | 100 |
| 0.762 | 100 | 0 | 0 | 100 |
| 0.991 | 100 | 0 | 0 | 100 |
| 1.189 | 90 | 0 | 0 | 100 |
| 1.219 | 27 | 0 | 0 | 100 |
Stressor Response Chart
Mean Response
±1 Standard Deviation
Upper/Lower Limits