Model results for salmon survival.

Comparison of models describing variation in survival of Snake River sp/su Chinook salmon based on conditions during juvenile emigration (1998 to 2008). PDO7_9 = mean value from July to September; CCI6 = Copepod Community Index in June; CPUE6 = catch of yearling Chinook (fish km−1) in June; NPGO4_6 = mean value from April to June; and CRFlow4_7 = Columbia River flow from April to July. RSS = residual sum of squares, AICc = Akaike Information Criteria adjusted for small sample size. represents the difference between the AICc of the best model and the others. indicates the relative likelihood of the model given the data. Variables were transformed (logarithm or square root) to normalize distributions and homogenize variances.