Description of the fixed effects and model types used to analyse each reproductive parameter.

Fixed effects (in order of appearance in table). trt = treatment (fed or control), HD = standardized hatching date of earliest brood for that individual or pair, yr = year, maleage = male age (young (yearling) or old (2+)), chicks = number of nestlings alive at time of measurement, chickage = age of chicks (7 or 8 days old), found = standardized date nest found. Male ID/Female ID = individual identity of male/female. GLMM = Generalized linear mixed model fit by maximum likelihood, GLM = General linear model, LME = Linear mixed model fit by maximum likelihood.Description of the fixed effects and model types used to analyse each reproductive parameter.