Negative log likelihoods (-lnL), estimated adult natural mortality rates (<i>M</i>) and productivity (the breeding success rate for the pristine stock) with standard errors (SE) for the models that use each of the three alternative values for <i>b</i>, the power parameter for the relationship that relates environmental variables to chick mortality.

<p>Negative log likelihoods (-lnL), estimated adult natural mortality rates (<i>M</i>) and productivity (the breeding success rate for the pristine stock) with standard errors (SE) for the models that use each of the three alternative values for <i>b</i>, the power parameter for the relationship that relates environmental variables to chick mortality.