Speciation dynamics and extent of parallel evolution along a lake-stream environmental contrast in African cichlid fishes.

ABSTRACT: Understanding the dynamics of speciation is a central topic in evolutionary biology. Here, we investigated how morphological and genomic differentiation accumulated along the speciation continuum in the African cichlid fish Astatotilapia burtoni. While morphological differentiation was continuously distributed across different lake-stream population pairs, we found that there were two categories with respect to genomic differentiation, suggesting a “gray zone” of speciation at ~0.1% net nucleotide divergence. Genomic differentiation was increased in the presence of divergent selection and drift compared to drift alone. The quantification of phenotypic and genetic parallelism in four cichlid species occurring along a lake-stream environmental contrast revealed parallel and antiparall

SUBMITTER: Weber AA 

PROVIDER: S-EPMC8565912 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature