Backstep selection model examining chick body size.

A backstep selection summary (PROC GLMSELECT) from a model examining the relationship between the body size (wing length) of common guillemot chicks at fledging and a set of explanatory variables. The variables were 1) inflow of Atlantic water [SV], 2) cod larvae from southern spawning grounds reaching Hornøya, 3) ICES estimate of 1-gr herring [logno × 106] in the Barents sea, 4) ICES estimate of total spawning stock of capelin [logno × 106] in the Barents Sea, 5) fraction of capelin, herring and sandeel [%] in the chick diet in different years and 6) the population size of common guillemots on Hornøya. Covariates were sequentially removed according to improvement of the model (the reduction of AICC values). Np, number of parameters in the model, Adj R2, adjusted R2 for the number of parameters in the model. Estimate and significance level are given for the selected parameter.