Application of the power analysis algorithm to chick condition data standardised by month

The effect of a month on the estimation of the impact of fishing on penguin chick condition at Robben and Dassen islands is taken into account by GLM standardising the chick condition data for this co-variate. The difference to results is small, with comparable estimates of the impact moving slightly in the direction of a lesser impact of fishing compared to when the month co-variate is ignored.