Delimitation of species is especially taxing when populations of similar organisms occupy non-overlapping geographical ranges. A new quantitative framework offers a consistent approach for tackling the problem.
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Brooks, T., Helgen, K. A standard for species. Nature 467, 540–541 (2010). https://doi.org/10.1038/467540a
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DOI: https://doi.org/10.1038/467540a
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