Fitness landscape and Species Recognition
This perspective emphasizes species as populations occupying distinct adaptive peaks or plateaus on a fitness landscape, where evolutionary cohesion is maintained by environmental selection rather than reproductive isolation. To be more specific, the number of species and the odds of detecting gene flow between species are both emerging properties of this ever-changing fitness landscape. By decoupling species recognition from the unrealistic expectation of zero gene flow, it reconciles conflicts between taxonomic practice and genomic evidence of introgression. This view also explains heterogeneous genomic divergence as a natural outcome of semi-permeable boundaries, rather than a failure of species concepts. The study provides taxonomists with a biologically grounded, flexible criterion for delimiting species, allowing stable classification while fully incorporating the dynamic, reticulate nature of evolutionary processes revealed by modern genomic data.
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