Genetic and ecomorphological divergence between sympatric Astyanax morphs from Central America

Carlos A. Garita-Alvarado, Marco Garduño-Sánchez, Marta Barluenga & Claudia Patricia Ornelas-García
Intraspecific ecological and morphological polymorphism can promote ecological speciation and the build-up of reproductive isolation. Here, we evaluate correlations among morphology, trophic ecology, and genetic differentiation between two divergent morphs (elongate and deep-body) of the fish genus Astyanax in the San Juan River basin in Central America, to infer the putative evolutionary mechanism shaping this system. We collected the two morphs from three water bodies and analyzed: 1) the correlation between body shape and the...
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