Coexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.

<h4>Background</h4>Mixed breeding systems with extended clonal phases and weak sexual recruitment are widespread in nature but often thought to impede the formation of discrete evolutionary clusters. Thus, cyclic parthenogens, such as cladocerans and rotifers, could be predisposed to &qu...

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Main Authors:	Markéta Faustová, Veronika Sacherová, H David Sheets, Jan-Erik Svensson, Derek J Taylor
Format:	article
Language:	EN
Published:	Public Library of Science (PLoS) 2010
Subjects:	Medicine R Science Q
Online Access:	https://doaj.org/article/d077e904d0a1494096db29a18aeda634
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spelling	oai:doaj.org-article:d077e904d0a1494096db29a18aeda6342021-12-02T20:20:00ZCoexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.1932-620310.1371/journal.pone.0011623https://doaj.org/article/d077e904d0a1494096db29a18aeda6342010-07-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20661283/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Mixed breeding systems with extended clonal phases and weak sexual recruitment are widespread in nature but often thought to impede the formation of discrete evolutionary clusters. Thus, cyclic parthenogens, such as cladocerans and rotifers, could be predisposed to "species problems" and a lack of discrete species. However, species flocks have been proposed for one cladoceran group, Eubosmina, where putative species are sympatric, and there is a detailed paleolimnological record indicating a Holocene age. These factors make the Eubosmina system suitable for testing the hypotheses that extended clonal phases and weak sexual recruitment inhibit speciation. Although common garden experiments have revealed a genetic component to the morphotypic variation, the evolutionary significance of the morphotypes remains controversial.<h4>Methodology/principal findings</h4>In the present study, we tested the hypothesis of a single polymorphic species (i.e., mixing occurs but selection maintains genes for morphology) in four northern European lakes where the morphotypes coexist. Our evidence is based on nuclear DNA sequence, mitochondrial DNA sequence, and morphometric analysis of coexisting morphotypes. We found significant genetic differentiation, genealogical exclusivity, and morphometric differentiation for coexisting morphotypes.<h4>Conclusions</h4>We conclude that the studied morphotypes represent a group of young species undergoing speciation with apparent reproductive barriers despite coexistence in the freshwater pelagic zone.Markéta FaustováVeronika SacherováH David SheetsJan-Erik SvenssonDerek J TaylorPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 7, p e11623 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Markéta Faustová Veronika Sacherová H David Sheets Jan-Erik Svensson Derek J Taylor Coexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.
description	<h4>Background</h4>Mixed breeding systems with extended clonal phases and weak sexual recruitment are widespread in nature but often thought to impede the formation of discrete evolutionary clusters. Thus, cyclic parthenogens, such as cladocerans and rotifers, could be predisposed to "species problems" and a lack of discrete species. However, species flocks have been proposed for one cladoceran group, Eubosmina, where putative species are sympatric, and there is a detailed paleolimnological record indicating a Holocene age. These factors make the Eubosmina system suitable for testing the hypotheses that extended clonal phases and weak sexual recruitment inhibit speciation. Although common garden experiments have revealed a genetic component to the morphotypic variation, the evolutionary significance of the morphotypes remains controversial.<h4>Methodology/principal findings</h4>In the present study, we tested the hypothesis of a single polymorphic species (i.e., mixing occurs but selection maintains genes for morphology) in four northern European lakes where the morphotypes coexist. Our evidence is based on nuclear DNA sequence, mitochondrial DNA sequence, and morphometric analysis of coexisting morphotypes. We found significant genetic differentiation, genealogical exclusivity, and morphometric differentiation for coexisting morphotypes.<h4>Conclusions</h4>We conclude that the studied morphotypes represent a group of young species undergoing speciation with apparent reproductive barriers despite coexistence in the freshwater pelagic zone.
format	article
author	Markéta Faustová Veronika Sacherová H David Sheets Jan-Erik Svensson Derek J Taylor
author_facet	Markéta Faustová Veronika Sacherová H David Sheets Jan-Erik Svensson Derek J Taylor
author_sort	Markéta Faustová
title	Coexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.
title_short	Coexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.
title_full	Coexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.
title_fullStr	Coexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.
title_full_unstemmed	Coexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.
title_sort	coexisting cyclic parthenogens comprise a holocene species flock in eubosmina.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/d077e904d0a1494096db29a18aeda634
work_keys_str_mv	AT marketafaustova coexistingcyclicparthenogenscompriseaholocenespeciesflockineubosmina AT veronikasacherova coexistingcyclicparthenogenscompriseaholocenespeciesflockineubosmina AT hdavidsheets coexistingcyclicparthenogenscompriseaholocenespeciesflockineubosmina AT janeriksvensson coexistingcyclicparthenogenscompriseaholocenespeciesflockineubosmina AT derekjtaylor coexistingcyclicparthenogenscompriseaholocenespeciesflockineubosmina
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Coexisting cyclic parthenogens comprise a holocene species flock in Eubosmina.

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