Most-parsimonious linear mixed-effects models of Cape gannet behavioural parameters fitted by restricted maximum likelihood.

<p>M: Coefficient reflective of male behaviour.</p><p>These used the logarithm of foraging trip duration, nest attendance duration and provisioning rate of breeding adult birds at Bird Island, Algoa Bay, as a function of chick age as a continuous number, adult sex, adult sex interacting with chick age, time of bout initiation and adult body condition index (Model T1, N2 and Tf1; <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0116544#pone-0116544-t001" target="_blank">Table 1</a>). Model parameter estimates (P) represent the directional effect of the predictors relative to their reference category. Time is a factor divided into one-hour bins.</p><p>Most-parsimonious linear mixed-effects models of Cape gannet behavioural parameters fitted by restricted maximum likelihood.