YCT Multi-state Assessment February 10, 2003 



Table of Contents 



Executive Summary ii 



Table of Contents ii 



List of Tables iv 



List of Figures vi 



Introduction 1 



Analysis Area 1 



Methods 3 



Geographic Information System 3 



Scale issues 4 



Assessment Teams and Workshops 5 



Historical Range 5 



Barriers to Fish Movement 6 



Current distribution 6 



Genetic Status 6 



Abundance Relative to Habitat Potential 8 



Designated "Conservation Populations" 9 



Risk Classification 10 



Genetic Risks 10 



Population Risks 1 1 



Conservation Activities 13 



Land and Resource Management Impacts 13 



Summaries from Database 13 



Summaries that Linked Database to GIS Layers 13 



Results 16 



Historical Range 16 



Current Distribution 16 



Genetic Status 17 



Abundance Relative to Habitat Potential 20 



Occurrence in Special Land Management Areas 22 



Conservation Populations 25 



Ranked Risks to Conservation Populations 29 



Restoration Activities Implemented for Conservation Populations 29 



Land Use Impacts on Conservation Populations 35 



Fine-Spotted and Large Spotted Forms 35 



Discussion and Conclusions 39 



Historical Range 39 



Current Distribution 42 



Designated Conservation Populations 43 



Conclusions 45 



Acknowledgements 47 



References 47 



Appendix A 50 



Appendix B 67 



Page - ii 



