YCT Multi-state Assessment 



February 10,2003 



conservation populations. From this point, only conservation populations will be evaluated for 

 genetic and population risks. 



Genetic Risk Assessment 



A Genetic risk assessment will be made for each meta- or isolate po pulation using a ranking of 1 

 to 4 to indicate low to progressively higher risk (Table 10). Take into consideration those 

 actions and activities (Tables 10 and 1 1 ) that may have an influence on genetic risk. 



Table 12. Look-up table for genetic risk ranking. 



Population Risk Assessment 



Population risk assessments will be done for each meta- or isolate population using a ranking 

 that includes consideration of four factors. Risks will be ranked from low to high by using a 1 to 

 4 ranking system for four variables identified by Rieman et al. (1993) (Table 12). These four 

 main factors will be weighted to derive a final risk factor as follows: Temporal Variability = 0.7; 

 Population Size = 1 .2; Population Productivity (Growth/Survival) = 1 .6; and Isolation = 0.5. 



Table 13. Ranks of various types of viability risk to populafions. 



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