Fig. 1

Geographic distribution of color morph pairs in the young adaptive radiation of Midas cichlids. In Nicaragua, a number of small crater lakes have been colonized by Midas cichlids from the great lakes Managua and Nicaragua. The Midas cichlids within each crater lake are genetically more similar to each other than to any other population [14]. Gold morphs are found in both great lake and most crater lake populations, usually at low frequencies [17, 19]