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Bilandžija, Helena; Hollifield, Breanna; Steck, Mireille; Meng, Guanliang; Ng, Mandy; Koch, Andrew D; Gračan, Romana; Ćetković, Helena; Porter, Megan L; Renner, Kenneth J; Jeffery, William
eLife, 04/2020, Letnik: 9Journal Article
A widely accepted model for the evolution of cave animals posits colonization by surface ancestors followed by the acquisition of adaptations over many generations. However, the speed of cave adaptation in some species suggests mechanisms operating over shorter timescales. To address these mechanisms, we used , a teleost with ancestral surface morphs (surface fish, SF) and derived cave morphs (cavefish, CF). We exposed SF to completely dark conditions and identified numerous altered traits at both the gene expression and phenotypic levels. Remarkably, most of these alterations mimicked CF phenotypes. Our results indicate that many cave-related traits can appear within a single generation by phenotypic plasticity. In the next generation, plasticity can be further refined. The initial plastic responses are random in adaptive outcome but may determine the subsequent course of evolution. Our study suggests that phenotypic plasticity contributes to the rapid evolution of cave-related traits in .
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