Table 2.

Selection signals in the mitogenomes of Gammarus lacustris (GL) and Gammarus pisinnus (GP) inferred using BUSTED, aBSREL and RELAX algorithms. 13PCG is the dataset comprising all 13 concatenated (non-partitioned) protein-coding genes. Sites column shows the number of sites in the alignment. K column: a statistically significant K > 1 indicates that selection strength has been intensified, and K < 1 that selection strength has been relaxed. LR is likelihood ratio, p is p-value and D indicates the direction of selection pressure change: intensified (I) or relaxed (R), where * highlights a statistically significant (p < 0.05) result.

data	sites	Gammarus lacustris (GL)						Gammarus pisinnus (GP)
		BUSTED	aBSREL	RELAX				BUSTED	aBSREL	RELAX
		p-value	p-value	K	LR	p-value	D	p-value	p-value	K	LR	p-value	D
13PCG	3743	0.024*	0.005*	1.21	11.54	0.001	I*	0.001*	0.010*	0.63	56.39	0.000	R*
atp6	223	1.000	1.000	14.80	7.48	0.006	I*	0.487	1.000	0.68	1.51	0.219	R
atp8	58	1.000	1.000	1.02	0.02	0.897	I	0.000*	0.004*	0.13	1.14	0.286	R
cox1	527	1.000	1.000	1.87	12.31	0.000	I*	1.000	1.000	1.00	−0.38	1.000	I
cox2	231	1.000	1.000	1.60	2.76	0.097	I	1.000	1.000	1.00	0.00	1.000	R
cox3	262	0.345	0.087	2.24	8.05	0.005	I*	0.327	0.144	0.45	−6.96	1.000	R
cytb	380	1.000	0.168	2.37	6.63	0.010	I*	1.000	1.000	0.46	7.91	0.005	R*
nad1	313	1.000	1.000	1.18	0.90	0.343	I	0.749	1.000	0.77	3.24	0.072	R
nad2	330	0.718	1.000	1.01	0.37	0.543	I	0.562	0.431	0.84	0.42	0.516	R
nad3	119	1.000	1.000	7.91	6.98	0.008	I*	0.049*	0.454	0.64	2.28	0.131	R
nad4	447	1.000	1.000	1.04	0.40	0.530	I	1.000	1.000	0.58	7.75	0.005	R*
nad4 L	98	1.000	1.000	0.36	4.98	0.026	R*	1.000	1.000	2.05	2.61	0.106	I
nad5	579	0.741	0.385	1.38	4.23	0.040	I*	0.460	0.500	2.15	−45.82	1.000	I
nad6	176	0.766	0.500	0.95	−0.09	1.000	R	1.000	1.000	0.49	4.41	0.036	R*