Naman 2026: HSI Coho Juvenile Velocity (6°C daily net energy intake)
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Species Common Name
Coho Salmon
Latin Name (Genus species)
Oncorhynchus kisutch
Stressor Name
Velocity
Specific Stressor Metric
Water Velocity (focal velocity) at 6°C
Stressor Units
m/s
Vital Rate (Process)
Habitat Suitability Index
Geography
British Columbia (composite BC invertebrate database)
Key Covariates and Dependencies
Daily water temperature at 6°C
Detailed SR Function Description
Temperature-dependent velocity suitability for a 6.5-cm, 3-g juvenile Coho Salmon, derived from the daily net energy intake (NREId, J/d; black line) predicted by a drift-foraging bioenergetic model at 6°C. NREId = daily gross energy intake (capped by temperature-dependent maximum consumption, Cmax) minus daily foraging and standard metabolic costs. Values here are scaled 0–100 relative to the maximum of this 6°C line only (peak ≈1104 J/d at ~0.07 m/s), not the global maximum across temperatures used for the paper's Figure 3 HSCs. At 6°C gross intake is constrained by Cmax, producing a plateau and a low optimal velocity. Points were taken at the plotted model vertices (0.01–0.33 m/s, every 0.02 m/s) from the figure's vector line work; a final 0 was added at 0.340 m/s by extrapolating the last segment to NREI = 0, since the paper assigns 0 suitability to negative energy intake.
Stressor-response relationship data sourced from: Figure 2 — daily net energy intake (black line) vs. velocity, 6°C panel (left) (p. 4).
See linked SR Curve for 12C:
https://mjbayly.com/stressor-response/naman-2026-hsi-coho-juvenile-velocity-12degc-daily-net-energy-intake
Stressor-response relationship data sourced from: Figure 2 — daily net energy intake (black line) vs. velocity, 6°C panel (left) (p. 4).
See linked SR Curve for 12C:
https://mjbayly.com/stressor-response/naman-2026-hsi-coho-juvenile-velocity-12degc-daily-net-energy-intake
Function Derivation
Mechanistic drift-foraging (NREI) bioenergetic model expressed on a daily time step with temperature-dependent costs and Cmax (BioenergeticHSC + Wisconsin bioenergetics).
Transferability of Function
Specific to a 6.5-cm Coho at the stated temperature and BC composite drift; conceptual worked example rather than a site-calibrated curve.
Source of stressor Data
Model output (BioenergeticHSC) using composite BC invertebrate drift data, 14 h foraging time, 50% reduction in prey detection/capture.
Function Type
continuous
Stressor Scale
linear
References Cited
Naman, S. M. (2026). Developing temperature-dependent habitat suitability curves for instream flow modeling. North American Journal of Fisheries Management. Advance online publication. https://doi.org/10.1093/najfmt/vqag077
Images
Stressor Response csv data
Naman 2026 HSI Coho Juvenile Velocity 6C.csv
(360 bytes)
| Raw Stressor Values | Scaled Response Values 0 to 100 | SD | low.limit | up.limit |
|---|---|---|---|---|
| 0.01 | 9 | 0 | 0 | 100 |
| 0.03 | 44 | 0 | 0 | 100 |
| 0.05 | 77 | 0 | 0 | 100 |
| 0.07 | 100 | 0 | 0 | 100 |
| 0.09 | 98 | 0 | 0 | 100 |
| 0.11 | 96 | 0 | 0 | 100 |
| 0.13 | 93 | 0 | 0 | 100 |
| 0.15 | 90 | 0 | 0 | 100 |
| 0.17 | 86 | 0 | 0 | 100 |
| 0.19 | 82 | 0 | 0 | 100 |
| 0.21 | 79 | 0 | 0 | 100 |
| 0.23 | 74 | 0 | 0 | 100 |
| 0.25 | 70 | 0 | 0 | 100 |
| 0.27 | 58 | 0 | 0 | 100 |
| 0.29 | 41 | 0 | 0 | 100 |
| 0.31 | 24 | 0 | 0 | 100 |
| 0.33 | 8 | 0 | 0 | 100 |
| 0.34 | 0 | 0 | 0 | 100 |
Stressor Response Chart
Mean Response
±1 Standard Deviation
Upper/Lower Limits