Who spawns where? Temperature, elevation, and discharge differentially affect the distribution of breeding by six Pacific salmonids within a large river basin
Canadian Journal of Fisheries and Aquatic Sciences
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Abstract
Within the geographic range of salmonid fishes, many apparently suitable rivers and streams are used for reproduction by some species but not others. This is widely known but seldom addressed, as studies often examine factors determining the distribution of one or only a few species. We examined physical factors associated with the spawning distribution of six native Pacific salmonids (pink, chum, coho, and Chinook salmon, bull trout, and steelhead) in the Skagit River basin, Washington. Annual mean temperature and catchment elevation had the strongest association with spawning assemblage distribution, but stream length, annual discharge, seasonal hydrology, and land use were also influential. Some species (e.g., pink and Chinook salmon) were more closely associated with each other and with common variables than others, and bull trout were the most distinctive. For interpretation, we investigated the roles of adult body size, timing of spawning, and duration of juvenile rearing, but none of these factors explained groupings in the data. Interspecific differences in habitat association remained, suggesting fundamental constraints on species distributions with implications for conservation and restoration.
Suggested Citation
Austin, C.S., Torgersen, C.E., and Quinn, T.P., 2023, Who spawns where? Temperature, elevation, and discharge differentially affect the distribution of breeding by six Pacific salmonids within a large river basin: Canadian Journal of Fisheries and Aquatic Sciences, v. 80, no. 8, p. 1365-1384, https://doi.org/10.1139/cjfas-2022-0252.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Who spawns where? Temperature, elevation, and discharge differentially affect the distribution of breeding by six Pacific salmonids within a large river basin |
| Series title | Canadian Journal of Fisheries and Aquatic Sciences |
| DOI | 10.1139/cjfas-2022-0252 |
| Volume | 80 |
| Issue | 8 |
| Year Published | 2023 |
| Language | English |
| Publisher | Canadian Science Publishing |
| Contributing office(s) | Forest and Rangeland Ecosystem Science Center |
| Description | 20 p. |
| First page | 1365 |
| Last page | 1384 |
| Country | United States |
| State | Washington |
| Other Geospatial | Skagit River basin |