How to fail at species delimitation.
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TLDR
Researchers should apply a wide range of species delimitation analyses to their data and place their trust in delimitations that are congruent across methods, for in most contexts it is better to fail to delimit species than it is to falsely delimit entities that do not represent actual evolutionary lineages.Abstract:
Species delimitation is the act of identifying species-level biological diversity. In recent years, the field has witnessed a dramatic increase in the number of methods available for delimiting species. However, most recent investigations only utilize a handful (i.e. 2–3) of the available methods, often for unstated reasons. Because the parameter space that is potentially relevant to species delimitation far exceeds the parameterization of any existing method, a given method necessarily makes a number of simplifying assumptions, any one of which could be violated in a particular system. We suggest that researchers should apply a wide range of species delimitation analyses to their data and place their trust in delimitations that are congruent across methods. Incongruence across the results from different methods is evidence of either a difference in the power to detect cryptic lineages across one or more of the approaches used to delimit species and could indicate that assumptions of one or more of the methods have been violated. In either case, the inferences drawn from species delimitation studies should be conservative, for in most contexts it is better to fail to delimit species than it is to falsely delimit entities that do not represent actual evolutionary lineages.read more
Citations
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Delimiting Species and Varieties of Cycladenia humilis (Apocynaceae)
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Redescription and molecular characterisation of Panagrolaimus labiatus (Kreis, 1929) Andrássy, 1960 (Rhabditida, Panagrolaimidae) from India and proposal of P. burdwanensis Chaturvedi & Khera, 1979 as a junior synonym of P. labiatus
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High Andean Steppes of Southern Chile Contain Little-Explored Peltigera Lichen Symbionts
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Phylogenetics, integrative taxonomy and systematics of the Sesamia cretica species group (Lepidoptera: Noctuidae: Apameini: Sesamiina), with the description of 21 new species from the Afrotropical region
Bruno Le Ru,Noémie M.‐C. Hévin,Claire Capdevielle-Dulac,Boaz K. Musyoka,Michel Sezonlin,Des Conlong,Johnnie Van den Berg,Rose Ndemah,Philippe Le Gall,D. Cugala,Casper Nyamukondiwa,Beatrice Pallangyo,Mohamedi Njaku,Muluken Goftishu,Yoseph Assefa,Grégoire Bani,Richard Molo,Gilson Chipapika,G. Ong’amo,Anne-Laure Clamens,Jérôme Barbut,Gael J. Kergoat +21 more
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