Supplementary 1. Locations and sample sizes (N) of the studied Esox lucius populations (A) along with the map of locations (B).
A
Localization
Puck Bay
Reda river (estuary, Rewa town)
Motława river (estuary)
Vistula Lagoon (Krynica Morska
town)
Vistula Lagoon (Frombork town)
Szczecin Lagoon (Polish part)
Szczecin Lagoon (German part)
Bukowo lake
Jamno lake
Rega river (estuary)
Zelwa lake
Osiek lake (Dobiegniew town)
Jaroszewskie lake (Sieraków town)
Drawsko lake (Drawski Natural
Reserve)
Odra river (Polish part)

Class
2010-2014
2012
2009-2014

N
213
11
171

Type
brackish
brackish
brackish

2010

12

2011
2012
2013
2012
2012
2012
2009
2009
2009

12
5
14
30
27
11
19
18
15

brackish
brackish
brackish
freshwater
freshwater
freshwater

54°36'N 19°68E
53°85'N 14°41E
53°45'N 14°04E
54°36'N 16°31E
54°28'N 16°15E
54°14'N 15°28E
54°02'N 23°42E
52°95'N 15°68E
52°62'N 16°09E

2009

18

freshwater

53°59'N 16°18E

2013

11

freshwater

Odra river (Germany part)

2013

18

freshwater

Wisłoka river

2013

24

freshwater

51°06'N 17°01E
52°41'N 14°25E/
52°16'N 14°35E
50°17'N 21°26E/
50°03'N 21°24E

brackish
brackish

Coordinates
52°23'N 21°01E
54°64'N 18°46E
54°35'N 18°67E
54°38'N 19°44E

B

Elbe river

2013

16

freshwater

Borowe lake (Małkinia Mała town)

2011

23

freshwater

53°04'N 11°27E/
53°22'N 10°32E/
53°23'N 10°13E/
53°01'N 11°27E/
51°51'N 12°27E
52°59'N 21°46E