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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Journal ArticleDOI
Using multi-locus sequence data for addressing species boundaries in commonly accepted lichen-forming fungal species
Xin Zhao,Xin Zhao,Samantha Fernández-Brime,Mats Wedin,Marissa C. Locke,Steven D. Leavitt,H. Thorsten Lumbsch +6 more
TL;DR: This study addressed the species delimitation in the crustose lichen-forming fungal genus Diploschistes using multilocus sequence data from specimens representing 16 currently accepted species and indicates the presence of previously undetected, cryptic species-level lineages in the subgenus Limborina.
Journal ArticleDOI
Genomic evidence for polyphyletic origins and interlineage gene flow within complex taxa: a case study of Picea brachytyla in the Qinghai-Tibet Plateau
TL;DR: The phylogenomic analyses suggest that the sampled trees of P. brachytyla cluster into two distinct lineages corresponding to the two taxonomically recognized intraspecific varieties, and abba‐baba and ∂a∂i analyses suggests that gene flow between these two independently evolved lineages has been extensive and bidirectional.
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Molecular and morphological data of the freshwater fish Glandulocauda melanopleura (Characiformes: Characidae) provide evidences of river captures and local differentiation in the Brazilian Atlantic Forest.
TL;DR: Phylogenetic and phylogeographic analyses allied to divergence times and geomorphological information indicate that the current distribution of G. melanopleura is a result of relatively recent river captures involving the Tietê and some other coastal drainages, which corroborate the need to understand population structure for conservation planning.
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Integrating genomic and phenotypic data to evaluate alternative phylogenetic and species delimitation hypotheses in a recent evolutionary radiation of grasshoppers
TL;DR: This study highlights the importance of integrating multiple sources of information to test competing phylogenetic hypotheses and elucidate the evolutionary history of species complexes representing early stages of divergence where conflicting inferences are more prone to appear.
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Incongruence in molecular species delimitation schemes: What to do when adding more data is difficult.
TL;DR: Two molecular species delimitation approaches are applied, spedeSTEM and BPP, to the Castilleja ambigua (Orobanchaceae) species complex, a relatively young plant lineage in western North America and it is found that spede STEM lacks the power to delimit while BPP is capable, thus allowing for address incongruence before proceeding in delimitation.
References
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