Table 1.

Effect size (β), standard error (SE), lower (LCI) and upper (UCI) 95% confidence interval of explanatory variables for the analysis of tail fat index in a Eurasian beaver population in south-eastern Norway between 1998 and 2018 (n_young = 333, n_adults = 828).

Variables	Estimate	SE	LCI	UCI	R2marginal	R2conditional
Young (kits and yearlings)
Intercept	1.496	0.089	1.322	1.670	0.56	0.73
Captures	0.001	0.014	− 0.026	0.028
Years of monitoring	0.002	0.004	− 0.006	0.010
Sex (male)	− 0.018	0.037	− 0.090	0.054
Age	1.051	0.050	0.952	1.150
Season (summer)	0.486	0.061	0.366	0.606
Season (autumn)	0.784	0.068	0.651	0.917
Log (territory size)	− 0.079	0.051	− 0.179	0.021
Family group size	− 0.003	0.008	− 0.019	0.013
Adults (2 + years)
Intercept	3.641	0.107	3.431	3.852	0.12	0.48
Captures	− 0.005	0.006	− 0.017	0.007
Years of monitoring	0.000	0.002	− 0.004	0.003
Carried telemetry device (yes)	− 0.006	0.021	− 0.047	0.034
Sex (male)	0.131	0.038	0.055	0.206
Age	0.100	0.022	0.058	0.142
Age2	− 0.006	0.001	− 0.008	− 0.004
Social status (subordinate)	− 0.145	0.079	− 0.299	0.009
Origin (resident)	− 0.001	0.016	− 0.033	0.031
Season (summer)	0.022	0.032	− 0.040	0.084
Season (autumn)	0.131	0.052	0.029	0.233
Log (territory size)	− 0.008	0.018	− 0.043	0.028
Family group size	0.001	0.004	− 0.006	0.008
Captures: social status (subordinate)	0.000	0.003	− 0.006	0.006
Season (summer): sex (male)	− 0.011	0.035	− 0.080	0.059
Season (autumn): sex (male)	− 0.061	0.074	− 0.206	0.083
Social status (subordinate): age	0.018	0.011	− 0.005	0.040

Beaver ID, capture year and river were included as random effects. We performed model averaging of best models (ΔAICc < 4) to estimate the effect size of each variable. Informative parameters are given in bold.

Reference level of sex: female.

Reference level of season: spring.

Reference level of carried telemetry device: no.

Reference level of social status: dominant.

Reference level of origin: immigrant.