Table 1.

Model A. Social dominance in relation to age and body size. (Note that a negative slope signifies increasing dominance. The effect of delta age β_W, average age β_B() (equation 2.2), tarsus size and the variable [returned?], i.e. whether individuals return to the colony in the subsequent year. n = 149 bird years, of 69 individuals. Deviance denotes the −2 log-likelihood value of the model fit.)

model A	deviance	fixed effect	slope	s.e.	p-value
null	83.94	intercept (β0)
final	57.12	intercept (β0)	11.135	4.225	<0.001
		tarsus	−0.229	0.092	0.013
		delta age (βW )	−0.221	0.069	0.001
		average age (βB )	0.052	0.048	0.276
		returned?	−0.581	0.281	0.038
rejected terms
		(average age)2	0.009	0.016	0.577
		(delta age)2	0.001	0.028	0.998
		average age × returned?	0.098	0.110	0.377
		tarsus × returned?	−0.037	0.213	0.860
		average age × tarsus	−0.023	0.037	0.524