Predator-driven Phenotypic Variation in Mosquitofish

The rapid and dramatic changes in biotic and abiotic characteristics following tidal creek fragmentation is predicted to generate substantially different selection pressures for organisms inhabiting the system than were naturally present before anthropogenic impacts.  We (with Brian Langerhans) are testing predictions of phenotypic differentiation based on explicit hypotheses of divergent natural selection between fragmentation regimes. Our model organism is a small endemic, livebearing fish species, Bahamas mosquitofish (Gambusia hubbsi).  One of the first papers demonstrates clear diet divergence between populations in unfragmented and fragmented systems.  Many more findings to come soon.