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Population structure in G. fortis as visualized through factorial correspondence analysis of multilocus genotypes (Genetix v. 3.1). The black and white squares are small and large beak-size classes, respectively. (a) At El Garrapatero, the two morphs occupy different, although partly overlapping distributions. (b) At Academy Bay and (c) Borrero Bay, the two morphs occupy similar distributions, although some slight separation is evident, particularly for Academy Bay.
