Fig. 1.

Map of threespine stickleback populations examined in the present study. Symbols represent the type of habitat sampled: white circle=marine, green triangle=stream, yellow square=lake, interlocked orange and blue diamonds=benthic–limnetic pair lakes. Population abbreviations are as follows: Allen Creek-AC, Beaver Lake-BL, Hotel Lake-HL, Japanese Pacific-JP, Little Campbell Marine-LM, Little Campbell Stream-LS, Manchester Clam Bay-MC, Misty Inlet-MI, Misty Lake-ML, Misty Outlet-MO, North Lake-NL, Paxton Benthic-PB, Paxton Limnetic-PL, Priest Benthic-RB, Priest Limnetic-RL, Willapa Bay-WB.