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.