Species boundaries to the limit: Integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the Hajar banded ground gecko (Trachydactylus hajarensis)
With the advent of molecular phylogenetics and the implementation of Multispecies Coalescent-based (MSC) species delimitation methods (SDM), the number of taxonomic studies unveiling and describing cryptic sibling species has greatly increased. However, speciation between early divergent lineages is often defined without evaluating population structure or gene flow, which can lead to false claims of species status and, subsequently, taxonomic inflation. In this study, we focus on the intriguing case of the Arabian gecko Trachydactylus hajarensis (Squamata: Gekkonidae). We generated mitochondrial data (12S rDNA) and genome-wide SNP data (ddRADseq) for 52 specimens to determine phylogenomic relationships, population structure and genetic diversity within this species. Then, we applied a set of different SDMs to evaluate several competing species hypotheses through the MSC. Results show that T. hajarensis is comprised by three well-defined population lineages, two of them in the Hajar Mountains of eastern Arabia, and one in Masirah Island, on the southeastern coast of Oman. Strong mito-nuclear discordances were found between populations inhabiting the Hajar Mountains, but we did not find evidence of current gene flow between them. Surprisingly, discordances in species tree topology were found when different downsampled datasets were used, and especially when linking population sizes, a commonly implemented feature in species tree reconstruction with genomic data. Different SDMs yielded different results, supporting from four species within the group, to T. hajarensis being a single species. With such contrasting results we suggest caution before splitting T. hajarensis. Overall, this study highlights the importance of sample and prior choice and the integration of several SDMs to not incur into taxonomic inflation, providing a set of already available tools to assess population structure, genetic diversity, and SDMs before describing new species.
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Language: | English |
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Elsevier
2023-09
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Subjects: | ddRAD, Gekkota, Genomics, Incipient species, Speciation, |
Online Access: | http://hdl.handle.net/10261/348693 |
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ddRAD Gekkota Genomics Incipient species Speciation ddRAD Gekkota Genomics Incipient species Speciation |
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ddRAD Gekkota Genomics Incipient species Speciation ddRAD Gekkota Genomics Incipient species Speciation Burriel-Carranza, Bernat Estarellas, Maria Riaño, Gabriel Talavera, Adrián Tejero-Cicuéndez, Héctor Els, Johannes Carranza, Salvador Species boundaries to the limit: Integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the Hajar banded ground gecko (Trachydactylus hajarensis) |
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With the advent of molecular phylogenetics and the implementation of Multispecies Coalescent-based (MSC) species delimitation methods (SDM), the number of taxonomic studies unveiling and describing cryptic sibling species has greatly increased. However, speciation between early divergent lineages is often defined without evaluating population structure or gene flow, which can lead to false claims of species status and, subsequently, taxonomic inflation. In this study, we focus on the intriguing case of the Arabian gecko Trachydactylus hajarensis (Squamata: Gekkonidae). We generated mitochondrial data (12S rDNA) and genome-wide SNP data (ddRADseq) for 52 specimens to determine phylogenomic relationships, population structure and genetic diversity within this species. Then, we applied a set of different SDMs to evaluate several competing species hypotheses through the MSC. Results show that T. hajarensis is comprised by three well-defined population lineages, two of them in the Hajar Mountains of eastern Arabia, and one in Masirah Island, on the southeastern coast of Oman. Strong mito-nuclear discordances were found between populations inhabiting the Hajar Mountains, but we did not find evidence of current gene flow between them. Surprisingly, discordances in species tree topology were found when different downsampled datasets were used, and especially when linking population sizes, a commonly implemented feature in species tree reconstruction with genomic data. Different SDMs yielded different results, supporting from four species within the group, to T. hajarensis being a single species. With such contrasting results we suggest caution before splitting T. hajarensis. Overall, this study highlights the importance of sample and prior choice and the integration of several SDMs to not incur into taxonomic inflation, providing a set of already available tools to assess population structure, genetic diversity, and SDMs before describing new species. |
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Ministerio de Ciencia, Innovación y Universidades (España) |
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Ministerio de Ciencia, Innovación y Universidades (España) Burriel-Carranza, Bernat Estarellas, Maria Riaño, Gabriel Talavera, Adrián Tejero-Cicuéndez, Héctor Els, Johannes Carranza, Salvador |
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ddRAD Gekkota Genomics Incipient species Speciation |
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Burriel-Carranza, Bernat Estarellas, Maria Riaño, Gabriel Talavera, Adrián Tejero-Cicuéndez, Héctor Els, Johannes Carranza, Salvador |
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Burriel-Carranza, Bernat |
title |
Species boundaries to the limit: Integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the Hajar banded ground gecko (Trachydactylus hajarensis) |
title_short |
Species boundaries to the limit: Integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the Hajar banded ground gecko (Trachydactylus hajarensis) |
title_full |
Species boundaries to the limit: Integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the Hajar banded ground gecko (Trachydactylus hajarensis) |
title_fullStr |
Species boundaries to the limit: Integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the Hajar banded ground gecko (Trachydactylus hajarensis) |
title_full_unstemmed |
Species boundaries to the limit: Integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the Hajar banded ground gecko (Trachydactylus hajarensis) |
title_sort |
species boundaries to the limit: integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the hajar banded ground gecko (trachydactylus hajarensis) |
publisher |
Elsevier |
publishDate |
2023-09 |
url |
http://hdl.handle.net/10261/348693 |
work_keys_str_mv |
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dig-ibe-es-10261-3486932024-02-28T15:09:41Z Species boundaries to the limit: Integrating species delimitation methods is critical to avoid taxonomic inflation in the case of the Hajar banded ground gecko (Trachydactylus hajarensis) Burriel-Carranza, Bernat Estarellas, Maria Riaño, Gabriel Talavera, Adrián Tejero-Cicuéndez, Héctor Els, Johannes Carranza, Salvador Ministerio de Ciencia, Innovación y Universidades (España) Agencia Estatal de Investigación (España) Ministerio de Ciencia e Innovación (España) La Caixa European Commission Carranza, Salvador [0000-0002-5378-3008] ddRAD Gekkota Genomics Incipient species Speciation With the advent of molecular phylogenetics and the implementation of Multispecies Coalescent-based (MSC) species delimitation methods (SDM), the number of taxonomic studies unveiling and describing cryptic sibling species has greatly increased. However, speciation between early divergent lineages is often defined without evaluating population structure or gene flow, which can lead to false claims of species status and, subsequently, taxonomic inflation. In this study, we focus on the intriguing case of the Arabian gecko Trachydactylus hajarensis (Squamata: Gekkonidae). We generated mitochondrial data (12S rDNA) and genome-wide SNP data (ddRADseq) for 52 specimens to determine phylogenomic relationships, population structure and genetic diversity within this species. Then, we applied a set of different SDMs to evaluate several competing species hypotheses through the MSC. Results show that T. hajarensis is comprised by three well-defined population lineages, two of them in the Hajar Mountains of eastern Arabia, and one in Masirah Island, on the southeastern coast of Oman. Strong mito-nuclear discordances were found between populations inhabiting the Hajar Mountains, but we did not find evidence of current gene flow between them. Surprisingly, discordances in species tree topology were found when different downsampled datasets were used, and especially when linking population sizes, a commonly implemented feature in species tree reconstruction with genomic data. Different SDMs yielded different results, supporting from four species within the group, to T. hajarensis being a single species. With such contrasting results we suggest caution before splitting T. hajarensis. Overall, this study highlights the importance of sample and prior choice and the integration of several SDMs to not incur into taxonomic inflation, providing a set of already available tools to assess population structure, genetic diversity, and SDMs before describing new species. SC is supported by grants PGC2018-098290-B-I00 (MCIU/AEI/FEDER, UE) and PID2021-128901NB-I00 funded by MCIN/AEI/10.13039/501100011033 and by ERDF, a way of making Europe. BB-C was funded by FPU grant from Ministerio de Ciencia, Innovación y Universidades, Spain (FPU18/04742). GR was funded by an FPI grant from the Ministerio de Ciencia, Innovación y Universidades, Spain (PRE2019-088729). AT is supported by “la Caixa” doctoral fellowship programme (LCF/BQ/DR20/11790007). HT-C is supported by a “Juan de la Cierva - Formación” postdoctoral fellowship (FJC2021-046832-I) funded by MCIN/AEI/10.13039/501100011033 and by the European Union NextGenerationEU/PRTR. Peer reviewed 2024-02-28T14:54:40Z 2024-02-28T14:54:40Z 2023-09 artículo Molecular Phylogenetics and Evolution 186: 107834 (2023) 1055-7903 http://hdl.handle.net/10261/348693 10.1016/j.ympev.2023.107834 1095-9513 en #PLACEHOLDER_PARENT_METADATA_VALUE# #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-098290-B-I00/ES/LAS MONTAÑAS DE LOS HAJARS DEL SURESTE DE ARABIA: UN LABORATORIO PARA ENTENDER COMO LA BIODIVERSIDAD SE GENERA Y SE MANTIENE Y COMO CONSERVARLA/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-128901NB-I00/ES/UNA APROXIMACION MULTI-OMICA A LA EVOLUCION DE LAS VIBORAS DEL VIEJO MUNDO Y SUS ARSENALES TOXICOS/ https://doi.org/10.1016/j.ympev.2023.107834 Sí none Elsevier |