TABLE 3.

Summary of seasonal stable isotope analyses (SIA) of black bears' serum (Spring: n = 29, Late summer/fall: n = 16) in northern Québec and Labrador, Canada

Food sources a	%PDM		SIA
	$\overline{\mathrm{x}}$	SD	$\overline{\mathrm{x}}$	95% CI
Spring
Caribou	7	18	6	0–28
Small mammals	44	41	58	28–77
Birds and eggs	4	11	5	0–23
Fishes	1	–	1	0–1
Plants and berries	44	37	30	20–42
Late summer/fall
Caribou	1	6	1	0–8
Small mammals	39	38	36	20–49
Birds	1	8	1	0–8
Fishes	1	–	0	0–1
Plants and berries	58	38	62	49–74

Results are given as mean proportion of food sources in the diet of bears at the population scale ( $\overline{\mathrm{x}}$ ; 2016 and 2017 pooled; with 95% credible interval [CI]) for SIA. Proportions of food sources in the diet of bears derived from morphological and molecular examination of feces (%P_DM, $\overline{\mathrm{x}}$ with standard deviation [SD]) were used as priors in SIA.

^aSee Appendix 1for additional details on food sources.