YCT Multi-state Assessment February 10, 2003 



List of Figures 



Figure 1. Streams that were included (dark) as part of the historical distribution and excluded 

 (light) from the stream layer for historically occupied watersheds 2 



Figure 2. Genetic status of Yellowstone cutthroat trout populations throughout their range. Gray 

 lines indicate historical range 18 



Figure 3. Genetic status of Yellowstone cutthroat trout expressed as proportion of currently 

 occupied habitats (in miles) classified within each genetic status category for assessment 

 done in 2001 19 



Figure 4. Distribution of the number offish sampled for genetic tesfing, by level of introgression 

 detected, for assessment done in 2001 20 



Figure 5. Relative abundance related to habitat potential overlaying designated wilderness and 

 road-less areas and national parks 24 



Figure 6. Designated conservation populafions of Yellowstone cutthroat trout (colored streams) 

 throughout their range shown overlaying their current distribufion (gray streams) as of 2001 . 

 Different colors were used to distinguish between different conservation populations and 

 have no other significance 26 



Figure 7. Frequencies of the number of miles occupied by designated conservafion populations 

 of Yellowstone cutthroat trout throughout their range. Mileage bins are uniformly assigned 

 at 5.0 mile intervals in top graph and non-uniformly assigned in bottom graph 28 



Figure 8. Proportions of miles occupied by designated "isolef (top) and metapopulation 

 (bottom) Yellowstone cutthroat trout conservation populations ranked into low to high 

 levels of risk by risk factor (vertical axes) 31 



Figure 9. Proportions for numbers of designated "isolet" (top) and metapopulation (bottom) 

 Yellowstone cutthroat trout conservation populations ranked into low to high levels of risk 

 by risk factor (vertical axes) 32 



Figure 10. Distribution of the number of designated Yellowstone cutthroat trout populations by 

 composite population risk scores and population type (excludes genefics and disease risks). 

 33 



Figure 1 1. Distribution of YCT conservafion populafions based on presence of the large spotted 

 form only, the fine spotted form only and a combination of both spotting patterns 37 



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