Table 1. Sampling sites and library characteristics.

Sample	Description	Geographic location	No. individuals sampled	Library length, bp	Number of reads	Number of reads mapped	Mean coverage, fold	Nucleotide diversity (π)
Nilmaa	Anadromous fish sampled from the sea	66°30.45′N, 33°7.68′E	16	571	228,077,463	204,905,523	44	0.00210
Ershovskoye (anadromous)a	Anadromous fish sampled from the Ershovskoye lake	66°32.21′N, 33°3.62′E	10	462	90,133,314	80,480,814	17	0.00188
Ershovskoye (residential)b	Freshwater lake, estimated age 33 years [33]	66°32.21′N, 33°3.62′E	12	538	275,789,662	241,741,391	52	0.00219
Martsyb	Freshwater lake, estimated age ∼250 years	66°35.95′N, 33°15.35′E	10	550	136,851,580	111,360,705	24	0.00181
Goluboyc	Quarry, population seeded in 1978 with 20 anadromous and 20 freshwater fish [34]	66°17.20′N, 33°23.29′E	20	572	261,538,220	224,807,642	48	0.00204
Malyshc	Quarry, population seeded in 1978 with 1 anadromous and 1 freshwater fish [34]	66°18.27′N, 33°25.27′E	20	613	334,921,323	293,874,942	63	0.00186
Lobaneshskoyed	Freshwater lake, estimated age ∼600 years	66°33.64′N, 33°13.45′E	8	572	126,403,232	107,371,357	23	0.00167
Mashinnoyed	Freshwater lake, estimated age ∼700 years	66°17.74′N, 33°21.82′E	10	512	110,084,409	87,460,315	19	0.00158

^amarine population;

^brecent natural freshwater populations;

^cartificial freshwater populations;

^dolder natural freshwater populations.

Columns provide description, coordinates of the sampling sites, number of individuals in the sample, characteristic of the libraries, numbers of reads, coverage and nucleotide diversity for each sample.