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Comparison of Winter Steelhead Trap Estimates in Small Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites. Erik Suring ODFW. Oregon Coast Steelhead. ODFW Salmonid Life-Cycle Monitoring Project

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Erik suring odfw

Comparison of Winter Steelhead Trap Estimates in Small Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

Erik Suring

ODFW


Oregon coast steelhead
Oregon Coast Steelhead Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • ODFW Salmonid Life-Cycle Monitoring Project

  • Small basin steelhead returns do not correlate to each other or large scale returns as with coho

  • Determining age structure at multiple life stages allow for survival estimates and local freshwater conditions


Life cycle monitoring project
Life-Cycle Monitoring Project Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • Ten years of adult and smolt data

  • ODFW Habitat Surveys

    • Compare distribution of habitat conditions


Life cycle monitoring project1
Life-Cycle Monitoring Project Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • Seven sites in the OC DPS

  • Non-random selection

  • Representative of DPS based on habitat metrics

  • Coho returns highly correlated with ESU returns


Life cycle data
Life-Cycle Data Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Lcm sites
LCM Sites Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Lcm basin size
LCM Basin Size Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Habitat representativeness
Habitat Representativeness Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Habitat representativeness1
Habitat Representativeness Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Habitat representativeness2
Habitat Representativeness Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Lcm representativeness
LCM Representativeness Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Lcm representativeness1
LCM Representativeness Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Coho trap to trap
Coho Trap to Trap Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Steelhead trap to trap
Steelhead Trap to Trap Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Trap to trap correlations
Trap to Trap Correlations Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Nested basins
Nested Basins Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

Coho: R2 = 0.92, p < 0.001


Lcm versus the dps
LCM versus the DPS Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • Relationships between LCM and large scale abundance are not as strong for steelhead as for coho

    • Steelhead numbers have not varied as much as coho over the course of monitoring

  • Weak trap to trap correlations indicate local freshwater conditions play a larger role in steelhead recruitment


Steelhead survival estimates
Steelhead Survival Estimates Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • Monitoring multiple life stages

  • Use scales to track brood year for smolts and adults

    • Estimate marine and freshwater survival rates

  • Currently in our first or second year of adult scale collection

    • Also measure size and timing of smolts and adults


Freshwater survival
Freshwater Survival Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • Single year of smolt scale data applied to all years:

  • Ward and Slaney (1993) Average 0.84%


Marine survival
Marine Survival Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • Smolt and Adult scales at WF Smith

  • Ward and Slaney (1988) Range 7-26%


Freshwater age structure
Freshwater Age Structure Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites


Survival estimates
Survival Estimates Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • Identify factors that affect smolt and adult abundance

    • Look at local variation in survival

    • Reveal trap to trap relationships

  • Other data we should collect?


Conclusion
Conclusion Basins to Other Escapement Methods and the Representativeness of ODFW Life-Cycle Monitoring Sites

  • Adult returns to LCM basins do not correlate to larger areas or each other

    • Local freshwater conditions obscure a common ocean signal

  • Describing smolt and adult age structure will allow for survival estimates and reveal differences between LCM sites


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