Table 2.

Correlations among components of the HPA axis within each population at each life history substage. Data are R², p-value. Bold indicates significant correlations.

	Mid incubation			Nestling provisioning
	Stress-induced (R2, p-value)	Post-dex (R2, p-value)	Negative feedback (R2, p-value)	Stress-induced (R2, p-value)	Post-dex (R2, p-value)	Negative feedback (R2, p-value)
Tennessee
Baseline	0.001, 0.94	0.005, 0.54		0.09, 0.03	0.18, 0.002
Stress-induced		0.08, 0.02	0.84, < 0.0001		0.27, 0.0001	0.69, < 0.0001
Post-dex			0.01, 0.33			0.02, 0.37
Stress response	0.99, < 0.0001		0.84, < 0.0001	0.99, < 0.0001		0.70, < 0.0001
New York
Baseline	0.02, 0.43	0.02, 0.41		0.001, 0.89	0.03, 0.43
Stress-induced		0.15, 0.01	0.96, < 0.0001		0.01, 0.62	0.57, < 0.0001
Post-dex			0.17, 0.01			0.52, 0.0001
Stress response	0.99, < 0.0001		0.96, < 0.0001	0.81, < 0.0001		0.50, 0.0008
Wyoming
Baseline	0.07, 0.02	0.005, 0.55		0.11, 0.07	0.01, 0.60
Stress-induced		0.001, 0.91	0.92, < 0.0001		0.08, 0.12	0.92, < 0.0001
Post-dex			0.001, 0.48			0.0002, 0.95
Stress response	0.99, < 0.0001		0.91, < 0.0001	0.99, < 0.0001		0.92, < 0.0001
Alaska
Baseline	0.001, 0.78	0.003, 0.66		0.01, 0.43	0.007, 0.54
Stress-induced		0.03, 0.15	0.71, < 0.0001		0.25, 0.0001	0.91, < 0.0001
Post-dex			0.005, 0.59			0.06, 0.10
Stress response	0.88, < 0.0001		0.69, < 0.0001	0.9, < 0.0001		0.90, < 0.0001