Ptolemy (2017): Coho and Spawning Depth
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Species Common Name
Coho Salmon
Latin Name (Genus species)
Oncorhynchus kisutch
Stressor Name
Depth
Specific Stressor Metric
Water Depth
Stressor Units
m
Vital Rate (Process)
Habitat Suitability Index
Geography
British Columbia (composite)
Detailed SR Function Description
The following HSI curves valid for B.C. were supplied by the B.C. Ministry of Environment and Climate Change Strategy (source: Ptolemy in 2017, unpublished) and then published in the Okanagan Nation Alliance (ONA). 2020 Environmental Flow Needs assessment.
The supplied HSI curves were originally developed for Water Use Plans by a team of B.C. specialists. Informal validation of the curves was based on spawner enumerations in the context of meso-habitat conditions over several years of reach-level surveys in other B.C. watersheds. Review of the supplied HSI curves by the project team led to several adjustments of the curves for the Okanagan, discussed in greater detail below. The final HSI curves used in this project are provided in Appendix D. No further field validation of the HSI curves was possible due to the extensive field effort that would be required.
These curves are recycled throughout various applications, but source data and methods remains unknown.
The supplied HSI curves were originally developed for Water Use Plans by a team of B.C. specialists. Informal validation of the curves was based on spawner enumerations in the context of meso-habitat conditions over several years of reach-level surveys in other B.C. watersheds. Review of the supplied HSI curves by the project team led to several adjustments of the curves for the Okanagan, discussed in greater detail below. The final HSI curves used in this project are provided in Appendix D. No further field validation of the HSI curves was possible due to the extensive field effort that would be required.
These curves are recycled throughout various applications, but source data and methods remains unknown.
Function Derivation
Empirical: fish density assessments coupled with stream transects (R. Ptolemy, unpublished data).
Transferability of Function
Developed from BC streams across a range of sizes; underlying data unpublished. Details and context remain unknown and unvalidated.
Source of stressor Data
R. Ptolemy (BC Ministry of Environment), unpublished juvenile coho density and transect data from streams throughout British Columbia.
Function Type
continuous
Stressor Scale
linear
References Cited
Okanagan Nation Alliance (ONA). 2020. Environmental Flow Needs assessment in the
Okanagan Basin. Prepared for B.C. Ministry of Forests, Lands, Natural Resource
Operations and Rural Development & the Okanagan Basin Water Board.
Okanagan Basin. Prepared for B.C. Ministry of Forests, Lands, Natural Resource
Operations and Rural Development & the Okanagan Basin Water Board.
Citation Link
Images
Stressor Response csv data
dpeth_ona.csv
(153 bytes)
| Stressor (X) | Mean System Capacity (%) | SD | low.limit | up.limit |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 100 |
| 0.07 | 0 | 0 | 0 | 100 |
| 0.3 | 100 | 0 | 0 | 100 |
| 1 | 100 | 0 | 0 | 100 |
| 1.22 | 10 | 0 | 0 | 100 |
| 2 | 10 | 0 | 0 | 100 |
Stressor Response Chart
Mean Response
±1 Standard Deviation
Upper/Lower Limits