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Lucati F, Miró A, Bosch J, Caner J, Jowers MJ, Rivera X, Donaire-Barroso D, Rebelo R, Ventura M. New insights on patterns of genetic admixture and phylogeographic history in Iberian high mountain populations of midwife toads. PLoS One 2022; 17:e0277298. [PMID: 36454960 PMCID: PMC9714896 DOI: 10.1371/journal.pone.0277298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 10/24/2022] [Indexed: 12/05/2022] Open
Abstract
Multiple Quaternary glacial refugia in the Iberian Peninsula, commonly known as "refugia within refugia", allowed diverging populations to come into contact and admix, potentially boosting substantial mito-nuclear discordances. In this study, we employ a comprehensive set of mitochondrial and nuclear markers to shed light onto the drivers of geographical differentiation in Iberian high mountain populations of the midwife toads Alytes obstetricans and A. almogavarii from the Pyrenees, Picos de Europa and Guadarrama Mountains. In the three analysed mountain regions, we detected evidence of extensive mito-nuclear discordances and/or admixture between taxa. Clustering analyses identified three major divergent lineages in the Pyrenees (corresponding to the eastern, central and central-western Pyrenees), which possibly recurrently expanded and admixed during the succession of glacial-interglacial periods that characterised the Late Pleistocene, and that currently follow a ring-shaped diversification pattern. On the other hand, populations from the Picos de Europa mountains (NW Iberian Peninsula) showed a mitochondrial affinity to central-western Pyrenean populations and a nuclear affinity to populations from the central Iberian Peninsula, suggesting a likely admixed origin for Picos de Europa populations. Finally, populations from the Guadarrama Mountain Range (central Iberian Peninsula) were depleted of genetic diversity, possibly as a consequence of a recent epidemic of chytridiomycosis. This work highlights the complex evolutionary history that shaped the current genetic composition of high mountain populations, and underscores the importance of using a multilocus approach to better infer the dynamics of population divergence.
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Affiliation(s)
- Federica Lucati
- Centre for Ecology, Evolution and Environmental Changes (cE3c) & Global Change and Sustainability Institute (CHANGE), Faculty of Sciences, University of Lisbon, Lisbon, Portugal
- Centre for Advanced Studies of Blanes (CEAB-CSIC), Blanes, Catalonia, Spain
- Sociodemography Research Group (DemoSoc), University Pompeu Fabra (UPF), Barcelona, Spain
| | - Alexandre Miró
- Centre for Advanced Studies of Blanes (CEAB-CSIC), Blanes, Catalonia, Spain
| | - Jaime Bosch
- IMIB-Research Unit of Biodiversity (CSIC/UO/PA), Universidad de Oviedo, Mieres, Spain
- Centro de Investigación, Seguimiento y Evaluación, Parque Nacional Sierra de Guadarrama, Rascafría, Spain
| | - Jenny Caner
- Centre for Advanced Studies of Blanes (CEAB-CSIC), Blanes, Catalonia, Spain
| | - Michael Joseph Jowers
- Departamento de Zoología, Facultad de Ciencias, Universidad de Granada, Granada, Spain
- National Institute of Ecology (NIE), Maseo-myeon, Seocheon-gun, Republic of Korea
| | - Xavier Rivera
- Catalan Society of Herpetology, Museu Blau, Barcelona, Catalonia, Spain
| | | | - Rui Rebelo
- Centre for Ecology, Evolution and Environmental Changes (cE3c) & Global Change and Sustainability Institute (CHANGE), Faculty of Sciences, University of Lisbon, Lisbon, Portugal
| | - Marc Ventura
- Centre for Advanced Studies of Blanes (CEAB-CSIC), Blanes, Catalonia, Spain
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Noguerales V, Ortego J. Genomic evidence of speciation by fusion in a recent radiation of grasshoppers. Evolution 2022; 76:2618-2633. [PMID: 35695020 PMCID: PMC9796961 DOI: 10.1111/evo.14508] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 03/22/2022] [Accepted: 04/02/2022] [Indexed: 01/22/2023]
Abstract
Postdivergence gene flow can trigger a number of creative evolutionary outcomes, ranging from the transfer of beneficial alleles across species boundaries (i.e., adaptive introgression) to the formation of new species (i.e., hybrid speciation). Although neutral and adaptive introgression has been broadly documented in nature, hybrid speciation is assumed to be rare and the evolutionary and ecological context facilitating this phenomenon still remains controversial. Through combining genomic and phenotypic data, we evaluate the hypothesis that the dual feeding regime (based on both scrub legumes and gramineous herbs) of the taxonomically controversial grasshopper Chorthippus saulcyi algoaldensis resulted from hybridization between the sister taxa C. binotatus (that exclusively feeds on scrub legumes) and C. saulcyi (that only feeds on gramineous herbs). Genetic clustering analyses and inferences from coalescent-based demographic simulations confirm that C. s. algoaldensis represents an independently evolving lineage and support the ancient hybrid origin of this taxon (about 1.4 Ma), which sheds light on its uncertain phylogenetic position and might explain its broader trophic niche. We propose a Pleistocene hybrid speciation model where range shifts resulting from climatic oscillations can promote the formation of hybrid swarms and facilitate their long-term persistence through geographic isolation from parental forms in topographically complex landscapes.
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Affiliation(s)
- Víctor Noguerales
- Department of Biological SciencesUniversity of CyprusNicosia1678Cyprus,Island Ecology and Evolution GroupInstituto de Productos Naturales y Agrobiología (IPNA‐CSIC)San Cristóbal de La Laguna38206Spain
| | - Joaquín Ortego
- Department of Integrative EcologyEstación Biológica de Doñana (EBD‐CSIC)Sevilla41092Spain
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González‐Serna MJ, Cordero PJ, Ortego J. Spatiotemporally explicit demographic modelling supports a joint effect of historical barriers to dispersal and contemporary landscape composition on structuring genomic variation in a red‐listed grasshopper. Mol Ecol 2019; 28:2155-2172. [DOI: 10.1111/mec.15086] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 03/22/2019] [Indexed: 01/05/2023]
Affiliation(s)
- María José González‐Serna
- Grupo de Investigación de la Biodiversidad Genética y Cultural Instituto de Investigación en Recursos Cinegéticos – IREC – (CSIC, UCLM, JCCM) Ciudad Real Spain
| | - Pedro J. Cordero
- Grupo de Investigación de la Biodiversidad Genética y Cultural Instituto de Investigación en Recursos Cinegéticos – IREC – (CSIC, UCLM, JCCM) Ciudad Real Spain
| | - Joaquín Ortego
- Department of Integrative Ecology Estación Biológica de Doñana – EBD – (CSIC) Seville Spain
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Noguerales V, Cordero PJ, Ortego J. Integrating genomic and phenotypic data to evaluate alternative phylogenetic and species delimitation hypotheses in a recent evolutionary radiation of grasshoppers. Mol Ecol 2018; 27:1229-1244. [DOI: 10.1111/mec.14504] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 12/16/2017] [Accepted: 01/05/2018] [Indexed: 02/06/2023]
Affiliation(s)
- Víctor Noguerales
- Grupo de Investigación de la Biodiversidad Genética y Cultural; Instituto de Investigación en Recursos Cinegéticos - IREC (CSIC, UCLM, JCCM); Ciudad Real Spain
| | - Pedro J. Cordero
- Grupo de Investigación de la Biodiversidad Genética y Cultural; Instituto de Investigación en Recursos Cinegéticos - IREC (CSIC, UCLM, JCCM); Ciudad Real Spain
| | - Joaquín Ortego
- Department of Integrative Ecology; Estación Biológica de Doñana (EBD-CSIC); Seville Spain
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