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Journal article
Estimating the carrying capacity of the Snake River for fall chinook salmon redds
Northwest science., Vol.75(4), pp.363-371
2001
Handle:
https://hdl.handle.net/2376/1051
Abstract
Recovery planning for imperiled populations of anadromous salmonids can require estimates of the carrying capacity of a river for redds (hereafter, redd capacity). We estimated redd capacity for the 106 known fall chinook salmon spawning sites in the upper and lower reaches of the Snake River. We used a modification of the Instream Flow Incremental Methodology to estimate spawning area (m2) for 12 representative study sites. We estimated that one redd occupied 70 m2 of spawning area at the most heavily utilized site. Spawning area was estimated at the 12 study sites using a stable flow that was implemented to prevent redd dewatering, and two other flows that encompassed natural fluctuation. We estimated redd capacity for each study site by dividing the amount of spawning area modeled at each of the three flows by 70 m2. We input the redd capacity estimates for the study sites into the equation for a stratified random sample to make three estimates of redd capacity for all 106 known spawning sites. The estimates ranged between 2,446 and 2,570 redds. We conclude that the Snake River can support the 1,250 redds needed to satisfy Endangered Species Act de-listing criteria. However, annual surveys should be conducted to eventually determine if recruitment efficiency is affected by density dependent factors before the recovery goal is achieved
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Details
- Title
- Estimating the carrying capacity of the Snake River for fall chinook salmon redds
- Creators
- W. P. Connor (Author)A. P. Garcia (Author)A. H. Connor (Author)E. O. Garton (Author)P. A. Groves (Author)J. A. Chandler (Author)
- Publication Details
- Northwest science., Vol.75(4), pp.363-371
- Academic Unit
- Northwest Science
- Publisher
- WSU Press
- Identifiers
- 99900501541301842
- Copyright
- In copyright ; openAccess ; http://rightsstatements.org/vocab/InC/1.0/ ; http://purl.org/eprint/accessRights/OpenAccess
- Language
- English
- Resource Type
- Journal article