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Discordant patterns of introgression across a narrow hybrid zone between two cryptic lineages of an Iberian endemic newt.
J Evol Biol. 2020 02; 33(2):202-216.JE

Abstract

The study of natural hybrid zones can illuminate aspects of lineage divergence and speciation in morphologically cryptic taxa. We studied a hybrid zone between two highly divergent but morphologically similar lineages (south-western and south-eastern) of the Iberian endemic Bosca's newt (Lissotriton boscai) in SW Iberia with a multilocus dataset (microsatellites, nuclear and mitochondrial genes). STRUCTURE and NEWHYBRIDS analyses retrieved few admixed individuals, which classified as backcrosses involving parental individuals of the south-western lineage. Our results show asymmetric introgression of mtDNA beyond the contact from this lineage into the south-eastern lineage. Analysis of nongeographic introgression patterns revealed asymmetries in the direction of introgression, but except for mtDNA, we did not find evidence for nonconcordant introgression patterns across nuclear loci. Analysis of a 150-km transect across the hybrid zone showed broadly coincident cline widths (ca. 3.2-27.9 km), and concordant cline centres across all markers, except for mtDNA that is displaced ca. 60 km northward. Results from ecological niche modelling show that the hybrid zone is in a climatically homogenous area with suitable habitat for the species, suggesting that contact between the two lineages is unlikely to occur further south as their distributions are currently separated by an extensive area of unfavourable habitat. Taken together, our findings suggest the genetic structure of this hybrid zone results from the interplay of historical (biogeographic) and population-level processes. The narrowness and coincidence of genetic clines can be explained by weak selection against hybrids and reflect a degree of reproductive isolation that is consistent with cryptic speciation.

Authors+Show Affiliations

Laboratorio Associado, CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO, Universidade do Porto, Vairão, Portugal.Laboratório de Evolução (LEVO), Instituto de Estudos Costeiros (IECOS), Universidade Federal do Pará, Pará, Brasil.Laboratorio Associado, CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO, Universidade do Porto, Vairão, Portugal.Laboratorio Associado, CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO, Universidade do Porto, Vairão, Portugal. Museu Paraense Emílio Goeldi, Coordenação de Zoologia, Pará, Brasil.Laboratorio Associado, CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO, Universidade do Porto, Vairão, Portugal. Laboratório de Evolução (LEVO), Instituto de Estudos Costeiros (IECOS), Universidade Federal do Pará, Pará, Brasil.Laboratorio Associado, CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO, Universidade do Porto, Vairão, Portugal. Museu de História Natural e da Ciência, Universidade do Porto, Porto, Portugal.Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales, CSIC (MNCN-CSIC), Madrid, Spain.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

31677317

Citation

Sequeira, Fernando, et al. "Discordant Patterns of Introgression Across a Narrow Hybrid Zone Between Two Cryptic Lineages of an Iberian Endemic Newt." Journal of Evolutionary Biology, vol. 33, no. 2, 2020, pp. 202-216.
Sequeira F, Bessa-Silva A, Tarroso P, et al. Discordant patterns of introgression across a narrow hybrid zone between two cryptic lineages of an Iberian endemic newt. J Evol Biol. 2020;33(2):202-216.
Sequeira, F., Bessa-Silva, A., Tarroso, P., Sousa-Neves, T., Vallinoto, M., Gonçalves, H., & Martínez-Solano, I. (2020). Discordant patterns of introgression across a narrow hybrid zone between two cryptic lineages of an Iberian endemic newt. Journal of Evolutionary Biology, 33(2), 202-216. https://doi.org/10.1111/jeb.13562
Sequeira F, et al. Discordant Patterns of Introgression Across a Narrow Hybrid Zone Between Two Cryptic Lineages of an Iberian Endemic Newt. J Evol Biol. 2020;33(2):202-216. PubMed PMID: 31677317.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Discordant patterns of introgression across a narrow hybrid zone between two cryptic lineages of an Iberian endemic newt. AU - Sequeira,Fernando, AU - Bessa-Silva,Adam, AU - Tarroso,Pedro, AU - Sousa-Neves,Tiago, AU - Vallinoto,Marcelo, AU - Gonçalves,Helena, AU - Martínez-Solano,Iñigo, Y1 - 2019/11/28/ PY - 2019/03/12/received PY - 2019/10/15/revised PY - 2019/10/25/accepted PY - 2019/11/5/pubmed PY - 2019/11/5/medline PY - 2019/11/3/entrez KW - amphibians KW - cline analysis KW - contact zone KW - cryptic speciation KW - introgression SP - 202 EP - 216 JF - Journal of evolutionary biology JO - J. Evol. Biol. VL - 33 IS - 2 N2 - The study of natural hybrid zones can illuminate aspects of lineage divergence and speciation in morphologically cryptic taxa. We studied a hybrid zone between two highly divergent but morphologically similar lineages (south-western and south-eastern) of the Iberian endemic Bosca's newt (Lissotriton boscai) in SW Iberia with a multilocus dataset (microsatellites, nuclear and mitochondrial genes). STRUCTURE and NEWHYBRIDS analyses retrieved few admixed individuals, which classified as backcrosses involving parental individuals of the south-western lineage. Our results show asymmetric introgression of mtDNA beyond the contact from this lineage into the south-eastern lineage. Analysis of nongeographic introgression patterns revealed asymmetries in the direction of introgression, but except for mtDNA, we did not find evidence for nonconcordant introgression patterns across nuclear loci. Analysis of a 150-km transect across the hybrid zone showed broadly coincident cline widths (ca. 3.2-27.9 km), and concordant cline centres across all markers, except for mtDNA that is displaced ca. 60 km northward. Results from ecological niche modelling show that the hybrid zone is in a climatically homogenous area with suitable habitat for the species, suggesting that contact between the two lineages is unlikely to occur further south as their distributions are currently separated by an extensive area of unfavourable habitat. Taken together, our findings suggest the genetic structure of this hybrid zone results from the interplay of historical (biogeographic) and population-level processes. The narrowness and coincidence of genetic clines can be explained by weak selection against hybrids and reflect a degree of reproductive isolation that is consistent with cryptic speciation. SN - 1420-9101 UR - https://www.unboundmedicine.com/medline/citation/31677317/Discordant_patterns_of_introgression_across_a_narrow_hybrid_zone_between_two_cryptic_lineages_of_an_Iberian_endemic_newt_ L2 - https://doi.org/10.1111/jeb.13562 DB - PRIME DP - Unbound Medicine ER -
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