Associations between changing climate and body condition over decades in two southern hemisphere passerine birds

Table 1 Factors associated with body condition (mass after accounting for size) for (a) red-winged fairy-wrens and (b) white-browed scrubwrens captured during the autumn and winter months (April–September) between 1977 and 2014

Model	Intercept	AnnNHotDays	Julian day	Age	NColdWetDays	Rain30D	Body size	Time of day	TminDB4	Sex (male)	df	AICc	Delta	Weight
(a) Red-winged fairy-wren
1	9.274 ± 0.031	NA	NA	−0.038 ± 0.017	− 0.046 ± 0.015	−0.057 ± 0.015	0.123 ± 0.021	0.117 ± 0.014	0.072 ± 0.015	0.451 ± 0.044	11	1480.362	0.000	0.213
2	9.275	0.021	NA	−0.035	− 0.046	− 0.060	0.124	0.118	0.071	+	12	1480.465	0.102	0.202
3	9.278	0.022	0.023	−0.036	− 0.044	− 0.068	0.126	0.118	0.078	+	13	1480.786	0.424	0.172
4	9.277	NA	0.022	−0.038	−0.044	− 0.065	0.125	0.117	0.079	+	12	1480.838	0.476	0.168
(b) White-browed scrubwren
1	10.854 ± 0.043	NA	0.050 ± 0.022	− 0.039 ± 0.020	NA	− 0.075 ± 0.021	0.172 ± 0.028	0.135 ± 0.017	0.042 ± 0.019	0.676 ± 0.059	11	1521.597	0.000	0.230
2	10.847	NA	0.048	NA	NA	−0.077	0.152	0.134	0.041	+	10	1523.334	1.738	0.097

Shown are standardized coefficients and their standard errors (s.e.) for variables included in the top models with ∆AICc less than 2, following model selection based on AICc. Climate variables identified as important in the top model have 95% CIs of estimated coefficients that do not overlap zero and are shown in bold. Models were ranked by ∆AICc values. n.a. represents variables that were not included in the model

ISSN: 2053-7565