| Title | Spatial distribution of run type genotypes in juvenile O. mykiss from the Eel and North Umpqua Rivers |
| Publication Type | Report |
| Year of Publication | 2020 |
| Authors | Miller, Michael |
| Secondary Title | Reviewing and Synthesizing the State of the Science Regarding Associations between Adult Run Timing and Specific Genotypes in Chinook Salmon and Steelhead: Report of a workshop held in Seattle, Washington, 27–28 February 2020 |
| Volume | no.2020-06 |
| Pagination | p.26-27 |
| Call Number | OSU Libraries: Digital Open Access |
| Keywords | Eel River (California), life history, Little Falls, North Umpqua River, reproductive biology, Steamboat Creek, Steamboat Falls, steelhead trout = Oncorhynchus mykiss |
| Notes | Extended abstract. Steelhead trout spring and summer runs are smaller than fall runs and tend to be dependent on barriers to fall migration. “There is a striking difference in the spatial distribution of winter and summer juveniles throughout the North Umpqua basin: middle and upper Steamboat Creek appear to be exclusively used by summer-run, whereas other locations throughout the North Umpqua Basin are primarily winter-run. Thus, the fish ladder on Steamboat Creek does not appear to have facilitated winter-run access, consistent with the idea that falls/rapids in lower Steamboat are acting as high-flow barriers which exclude winters (even during relatively dry winters)” (p.26). The author suggests that in areas where there are spring or summer runs but fall runs are not impeded by barriers, that managers protect the smaller runs by managing to decrease fall spawner access; for example, by restoring barriers dependent on water flow and by promoting “natural flow and temperature regimes” (p.27). |
| URL | https://repository.library.noaa.gov/view/noaa/24980 |
| Series Title | NOAA Processed Report NMFS-NWFSC-PR |
