Friend or Foe Influence of Resident Trout on

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Friend or Foe? Influence of Resident Trout on Steelhead Production in the Yakima Basin

Friend or Foe? Influence of Resident Trout on Steelhead Production in the Yakima Basin Ian Courter Cramer Fish Sciences David Child

Acknowledgements David Child, DC Consulting Jim Hobbs, UC Davis Chris Frederiksen, YN Joe Blodget,

Acknowledgements David Child, DC Consulting Jim Hobbs, UC Davis Chris Frederiksen, YN Joe Blodget, YN Dave Fast, YN Shadia Duery, CFS Jay Vaughan, CFS Tommy Garrison, CFS Steve Cramer, CFS Funding Yakima Basin Joint Board

Background • Use existing data to determine whether resident rainbow trout contribute to the

Background • Use existing data to determine whether resident rainbow trout contribute to the upper Yakima Basin steelhead population • Construct a steelhead population dynamics model that accounted for conspecific resident rainbow trout

Model Validation 350 Steelhead Spawner Abundance 300 Observed Predicted (default parameterization) Predicted (no Rf

Model Validation 350 Steelhead Spawner Abundance 300 Observed Predicted (default parameterization) Predicted (no Rf smolt production) 250 200 150 100 50 0 1992 1994 1996 1998 2000 2002 2004 2006

Photo Credit David Child

Photo Credit David Child

Hypotheses A significant number (≥ 10%) of resident rainbow trout offspring migrate to the

Hypotheses A significant number (≥ 10%) of resident rainbow trout offspring migrate to the ocean and return as adult steelhead.

0. 709 87 Sr : 86 Sr 0. 708 0. 707 0. 706 0.

0. 709 87 Sr : 86 Sr 0. 708 0. 707 0. 706 0. 705 0. 704 0. 703 0 500 1000 1500 2000 Microns 2500 3000

0. 710 87 Sr : 86 Sr 0. 709 0. 708 0. 707 0.

0. 710 87 Sr : 86 Sr 0. 709 0. 708 0. 707 0. 706 0. 705 0. 704 0. 703 0 500 1000 1500 Microns 2000 2500 3000

Photo Credit Frank Thrower

Photo Credit Frank Thrower

ce dan ate bun on R nt A ributi t ide Res nt Con

ce dan ate bun on R nt A ributi t ide Res nt Con ide Res nce unda b A d a e Steelhead Resilience

Conclusions O. mykiss populations in the Yakima Basin are partially anadromous, and significant numbers

Conclusions O. mykiss populations in the Yakima Basin are partially anadromous, and significant numbers of offspring from resident trout adopt an anadromous life-history. 17% resident maternal origin 30% or more have at least one resident parent steelhead population viability and recovery is dependent on existence of a robust resident trout cohort, which highlights the importance of jointly managing freshwater and anadromous life-histories as units of the same population.

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Da Plan foe Gado foe Dem Tem StapDa Plan foe Gado foe Dem Tem Stap
Da Plan foe Gado foe Dem Tem StapDa Plan foe Gado foe Dem Tem Stap
The IRB Friend or Foe Margaret J NeffThe IRB Friend or Foe Margaret J Neff
Application Profiles interoperable friend or foe Rachel HeeryApplication Profiles interoperable friend or foe Rachel Heery
Regular Expressions Friend or Foe Primo Gabrijeli PrimoRegular Expressions Friend or Foe Primo Gabrijeli Primo
Volcanoes Friend or Foe What are the effectsVolcanoes Friend or Foe What are the effects
Wikipedia Clinician Friend or Foe Emily C GoldmanWikipedia Clinician Friend or Foe Emily C Goldman
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Assessed reflective writing friend or foe Maria HussainAssessed reflective writing friend or foe Maria Hussain
AllDigital Networks Friend or Foe Sandy Teger andAllDigital Networks Friend or Foe Sandy Teger and
Harm reduction friend or foe Correctional officers andHarm reduction friend or foe Correctional officers and
Virtual Free Radical School Bilirubin Friend or FoeVirtual Free Radical School Bilirubin Friend or Foe
Compulsory Purchase Orders Friend or Foe Joe McCompulsory Purchase Orders Friend or Foe Joe Mc
Fear Friend or Foe Fear an unpleasant emotionFear Friend or Foe Fear an unpleasant emotion
The Game Show Friend or Foe In privateThe Game Show Friend or Foe In private
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Added Value Products Friend or Foe A PresentationAdded Value Products Friend or Foe A Presentation
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CHAPTER 2 MICROORGANISMS FRIEND AND FOE 1 MicroorganismsCHAPTER 2 MICROORGANISMS FRIEND AND FOE 1 Microorganisms
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Social Media Fundraising Facebook Friend or Foe MonicaSocial Media Fundraising Facebook Friend or Foe Monica
Careers Service Doctoral Internships Friend or Foe MsCareers Service Doctoral Internships Friend or Foe Ms
GMO Friend or Foe Genetically Modified Organisms DesignedGMO Friend or Foe Genetically Modified Organisms Designed
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Food Enzymes Friend or Foe A Great TeachingFood Enzymes Friend or Foe A Great Teaching
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Dynamic Pricing Friend Foe or the Future PresentedDynamic Pricing Friend Foe or the Future Presented
Food Enzymes Friend or Foe A Great TeachingFood Enzymes Friend or Foe A Great Teaching
Food Enzymes Friend or Foe A Great TeachingFood Enzymes Friend or Foe A Great Teaching
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Programmed Necrosis Friend Foe College of Pharmacy KeimyungProgrammed Necrosis Friend Foe College of Pharmacy Keimyung
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