| Summary: | The bottom panel (maps G-K) shows five geographical contact zones between M . edulis and M . trossulus , maps in the upper panel (A—F)—other studied areas. Pins depict sampling sites. Pie diagrams depict proportions of T-morphotypes (black sector) and E-morphotypes (white sector) in M . trossulus (diagrams with a red border) and M . edulis (those with a blue border) in combined samples from particular regions. If the data on salinity in sampling localities are available and considered in the analyses, it is indicated by the color of pins (light green–brackish, dark green–saline, white–salinity is unknown) and the proportions of the T-morphotypes in combined samples from brackish and saline localities are presented separately in diagrams placed on light and dark green background, respectively. Source data are given in S1 Table and S2 Table . Inkscape 0.92 [ 26 ] was used for producing the map.
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