Table 2 Post-hoc Tukey’s HSD on the variability δ³⁴S among species for each levels.

	Estimate	SE	t-value	p-value
USO2
Equus—Bison	− 1.02	0.608	− 1.68	0.234
Rangifer—Bison	0.60	0.421	1.42	0.347
*Rangifer—Equus*	1.62	0.501	3.23	0.013
USO4 (upper)
Equus—Bison	0.72	0.6405	1.13	0.505
Rangifer—Bison	0.56	0.6307	0.88	0.654
Rangifer—Equus	− 0.17	0.4597	− 0.36	0.929
USO4 (lower)
Equus—Bison	− 1.23	0.647	− 1.89	0.157
Rangifer—Bison	− 1.19	0.598	− 2.00	0.130
Rangifer—Equus	0.03	0.557	0.06	0.998
USO6
Equus—Bison	− 3.03	1.169	− 2.59	0.057
Rangifer—Bison	− 1.33	0.937	− 1.42	0.362
Rangifer—Equus	1.70	1.105	1.54	0.306
USO8
Equus—Bison	− 0.71	0.836	− 0.85	0.679
Rangifer—Bison	1.67	0.713	2.35	0.069
*Rangifer—Equus*	2.38	0.805	2.96	0.019

The estimates correspond to the difference in the mean variability between the compared groups. Significant differences in mean variability between groups are indicated in bold.

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