{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T13:00:10Z","timestamp":1791810010285,"version":"4.3.4"},"reference-count":64,"publisher":"Public Library of Science (PLoS)","issue":"7","license":[{"start":{"date-parts":[[2022,7,6]],"date-time":"2022-07-06T00:00:00Z","timestamp":1657065600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["20-74-00030"],"award-info":[{"award-number":["20-74-00030"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004442","name":"Narodowym Centrum Nauki","doi-asserted-by":"publisher","award":["NCN 2012\/07\/B\/NZ3\/02563"],"award-info":[{"award-number":["NCN 2012\/07\/B\/NZ3\/02563"]}],"id":[{"id":"10.13039\/501100004442","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>An intriguing outcome of hybridisation is the emergence of clonally and hemiclonally reproducing hybrids, that can sustain, reproduce, and lead to the emergence of polyploid forms. However, the maintenance of diploid and polyploid hybrid complexes in natural populations remains unresolved. We selected water frogs from the <jats:italic>Pelophylax esculentus<\/jats:italic> complex to study how diploid and triploid hybrids, which reproduce hemiclonally via hybridogenesis, are maintained in natural populations. During gametogenesis in diploid hybrids, one of the parental genomes is eliminated, and the remaining genome is endoreplicated. In triploid hybrids, the single-copy genome is typically eliminated, while genome endoreplication does not occur. To investigate how diploid and triploid hybrid frogs reproduce in populations without parental species, we crossed these hybrid animals from two separate pure hybrid populations located in Poland. Using cytogenetic analysis of tadpoles that emerged from the crosses, we established which gametes were produced by parental hybrids. The majority of hybrid females and hybrid males produced one type of gamete with the <jats:italic>P<\/jats:italic>. <jats:italic>ridibundus<\/jats:italic> genome. However, in both studied populations, approximately half of the diploid and triploid hybrids simultaneously produced gametes with different genome compositions and ploidy levels, specifically, the <jats:italic>P<\/jats:italic>. <jats:italic>ridibundus<\/jats:italic> and <jats:italic>P<\/jats:italic>. <jats:italic>lessonae<\/jats:italic> genomes, as well as diploid gametes with genomes of both parental species. Triploid hybrid males and females mostly produced haploid gametes with the <jats:italic>P<\/jats:italic>. <jats:italic>lessonae<\/jats:italic> genome; however, gametes with the <jats:italic>P<\/jats:italic>. <jats:italic>ridibundus<\/jats:italic> genome have also been observed. These results suggest that not all hybrids follow the classical hybridogenetic reproduction program and reveal a significant level of alterations in the gametogenesis pathways. In addition, we found a variable survival rate of particular progeny genotypes when we crossed hybrid females with different males suggesting the important role of postzygotic barriers on the maintenance of pure hybrid systems. We suggest that the observed variability in produced gametes and the different survival rate of the progeny with certain genotypes is crucial for the existence of pure hybrid systems.<\/jats:p>","DOI":"10.1371\/journal.pone.0268574","type":"journal-article","created":{"date-parts":[[2022,7,6]],"date-time":"2022-07-06T17:29:11Z","timestamp":1657128551000},"page":"e0268574","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":14,"title":["Maintenance of pure hybridogenetic water frog populations: Genotypic variability in progeny of diploid and triploid parents"],"prefix":"10.1371","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1152-813X","authenticated-orcid":true,"given":"Dmitrij","family":"Dedukh","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergey","family":"Riumin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8683-9867","authenticated-orcid":true,"given":"Krzysztof","family":"Kolenda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5480-2530","authenticated-orcid":true,"given":"Magdalena","family":"Chmielewska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beata","family":"Rozenblut-Ko\u015bcisty","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miko\u0142aj","family":"Ka\u017amierczak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria","family":"Ogielska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alla","family":"Krasikova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2022,7,6]]},"reference":[{"key":"pone.0268574.ref001","doi-asserted-by":"crossref","first-page":"287","DOI":"10.1098\/rstb.1998.0210","article-title":"The evolutionary genetics of speciation.","volume":"353","author":"JA Coyne","year":"1998","journal-title":"Philosophical Transactions of the Royal Society B: Biological Sciences"},{"key":"pone.0268574.ref002","volume-title":"Speciation.","author":"JA Coyne","year":"2004"},{"key":"pone.0268574.ref003","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1111\/j.1420-9101.2012.02599.x","article-title":"Hybridization and speciation","volume":"26","author":"R Abbott","year":"2013","journal-title":"Journal of Evolutionary Biology"},{"key":"pone.0268574.ref004","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1038\/nature05706","article-title":"Hybrid speciation","volume":"446","author":"J. 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