. Author manuscript; available in PMC: 2021 Jun 1.

Published in final edited form as: Gen Comp Endocrinol. 2020 Mar 28;292:113462. doi: 10.1016/j.ygcen.2020.113462

Table 3. Variation in individual corticosterone concentration as a function of life-history stage and time.

We used a MCMCglmm with random intercepts and slopes (with respect to life-history stage*time) at the level of the individual and series within individual. Variance in intercepts are printed with subscript ‘0’, variances in slopes with subscript ‘1’ for the among-individual (‘ind’), among-series (‘series’) levels; intercept-slope covariances (‘cov’) are presented at each level. Reference level for life-history stage is chick rearing. All values are reported as mean with 95% credible intervals.

Model Output			β (95% CI)	P-Value

Fixed effects	Intercept		36.99 (27.32, 47.30)	< 0.001
	Time		38.72 (26.34, 50.17)	< 0.001
	Life-history stage (Mate-pairing)		6.55 (−5.17, 18.46)	0.26
	Life-history stage (Territory estab.)		4.33 (−7.20, 15.46)	0.45
	Time × Life-history stage (Mate-pairing)		21.72 (7.38, 37.92)	0.01
	Time × Life-history stage (Territory estab.)		16.89 (7.38, 37.92)	0.02

Random effects			σ² (95% CI)

	Among individuals	V_ind0	103.84 (0.001, 272.6)
		V_ind1	86.11 (0.001, 254.3)
		Cov _{ind0, ind1}	55.75 (−18.17, 191.3)

	Within-individuals among-series	V_series0	177.30 (58.9, 329.9)
		V_series1	86.2 (0.001, 250.3)
		Cov _{series0, series1}	57.1 (−31.0, 188.9)

	Residuals		153.1 (87.09, 205.4)

	Repeatability	Intercept	0.35 (0.001, 0.69)
		Slope	0.50 (0.001, 0.99)