Table 1.

Statistics for the best performing models (ecosystem size (=PC1), biotic community (=PC2), small, steep shore gradient, deep lakes (=PC3), genetic diversity, and charr abundance) and each morphological variable. Following model simplification, ecosystem size remained as the only significant parameter explaining morphology across all tests. Significant p‐values are shown in italics. Asterisks indicate significance levels, with *p < .05, **p < .01, and ***p < .001

Morphology	Best model	Estimate	SE	t‐Value	p‐Value	R 2
MEANHD	MEANHD ~ PC1	−0.392	0.169	−2.317	.0297*	0.189
MINHD	MINHD ~ PC1	−0.663	0.253	−2.621	.0153*	0.230
MAXHD	MAXHD ~ PC1	1.306	0.443	2.949	.0070**	0.274
VARHD	VARHD ~ PC1	1.524	0.296	5.156	<.0001***	0.536