MetaData for Smolt Abundance Estimates for the Oregon Coast Coho Evolutionarily Significant Unit, Information Report 2018-04
Smolt Abundance Estimates for the Oregon Coast Coho Evolutionarily Significant Unit, Information Report 2018-04
Identification Information
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Citation
- Originator: Constable, R. J. and Erik Suring
- Publish Date: 5/30/2018
- Online Link: None, data available upon request
- BPA Project #:
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Contact Information
- Agency: Oregon Department of Fish and Wildlife
- Name: Ronald Constable
- Job Position: NRS-2 Assistant Project Leader
- Telephone: 541-757-5107
- E-Mail Address: ron.constable@oregonstate.edu
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Description
- Abstract: Analysis of Coho Salmon (Oncorhynchus kisutch) smolt abundance can provide insight on freshwater habitat capacity and factors affecting salmonid persistence. To explore these relationships we linked multi-year data sets of overwinter survival rates from three streams within the Oregon Coast Coho Evolutionarily Significant Unit (OCC) to summer parr abundance estimates from calibrated OCC-wide snorkel survey counts to estimate annual Coho Salmon smolt abundance from 2000-2017. Smolt abundance estimates ranged from a low of 0.9 million in 2000 to a high of 4.1 million in 2013 within the OCC. Accuracy of the smolt abundance estimates was tested using two datasets: (i) adult abundance modeled from the corresponding smolt abundance estimate was compared with adult abundance derived empirically from spawning ground surveys and (ii) our smolt abundance estimates were compared with smolt abundance estimates from trapping efforts in select basins within the OCC. Adult abundance modeled from smolt abundance estimates was highly correlated with adult abundance from spawning ground surveys (r = 0.88, p < 0.001) and smolt abundance estimates correlated with abundance from smolt trapping efforts (r = 0.81, p <0.001). Graphical relationships between smolt abundance and parental abundance suggest that freshwater productivity may be limited in the OCC by density dependent processes at spawner levels observed since 1998. Additionally, smolt abundance estimates have potential use as a variable in adult forecast models and could be used to assess trends in freshwater productivity and to probe factors of density dependence.
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- Purpose: Estimate yearly Coho Salmon smolt abundance in the Oregon Coast Coho ESU for OPSW monitoring efforts
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- Time Period of Content: 1998-2017
- Geographic Extent: Coastal Oregon rivers and streams
- Status: Final
- Use Constraints:
- Format: PDF file
Data Quality Information
- Lineage-Source: Parr estimates from Aquatic Inventories Project snorkel surveys, overwinter survival rates from Life Cycle Monitoring Project data, adult abundance data from Oregon Adult Salmonid Inventory and Sampling project data.
Data Information
- No data information was supplied.
Entity and Attribute Information
- Attributes Description: Field attribute information is available in the attached file(s).
Is a physical copy maintained for reference at Headquarters?
No
Files
File Name |
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File Uploaded |
File Description |
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SAEFinal.pdf
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Document File |
5/30/2018 1:24:08 PM |
Information Report on Coastal Coho smolt abundance |
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