Table 1.

Predictors of reproductive synchrony. Results of best-fit generalized linear mixed models predicting reproductive synchrony between females in communally nesting groups of greater anis, with ejection period (number of days elapsed between onset of laying for first and last-laying females) and number of eggs ejected as response variables. Initiation date was standardized relative to the mean for all nests in a given year, and stability was coded as a binary variable (0 = all female group members were present in the same group in the prior year, 1 = at least one female joined or left the group since the prior year). Italicized values are statistically significant at p < 0.0001.

response variable: ejection period (days)
	coefficient (s.e.)	Z	p	95% CI
fixed effects
number of females	2.22 (0.52)	4.29	<0.0001	1.20	3.23
age of last-laying female	0.01 (0.08)	0.15	0.88	−0.14	0.16
initiation date	0.36 (0.21)	1.72	0.08	−0.05	0.78
stability	3.55 (0.45)	7.93	<0.0001	2.67	4.43
intercept	−2.22 (1.20)	−1.85	0.07	−4.58	0.14
random effects
group ID	4.04 × 10−31 (4.21 × 10−16)