Title: Distribution and Origin of Chromosomal Races in the Freshwater Planarian Dugesia Polychroa (Turbellaria: Tricladida)
Abstract: HereditasVolume 124, Issue 1 p. 7-15 Open Access Distribution and Origin of Chromosomal Races in the Freshwater Planarian Dugesia Polychroa (Turbellaria: Tricladida) Leo W. Beukeboom, Corresponding Author Leo W. Beukeboom Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, GermanyLeo W. Beukeboom, Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltens Physiologie, D-82319 Seewiesen, Germany.Search for more papers by this authorRolf P. Weinzierl, Rolf P. Weinzierl Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, GermanySearch for more papers by this authorKent M. Reed, Kent M. Reed Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, Germany Current address: Department of Biology, University of Wisconsin, Milwaukee, WI 53201, USASearch for more papers by this authorNico K. Michiels, Nico K. Michiels Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, GermanySearch for more papers by this author Leo W. Beukeboom, Corresponding Author Leo W. Beukeboom Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, GermanyLeo W. Beukeboom, Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltens Physiologie, D-82319 Seewiesen, Germany.Search for more papers by this authorRolf P. Weinzierl, Rolf P. Weinzierl Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, GermanySearch for more papers by this authorKent M. Reed, Kent M. Reed Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, Germany Current address: Department of Biology, University of Wisconsin, Milwaukee, WI 53201, USASearch for more papers by this authorNico K. Michiels, Nico K. Michiels Arbeitsgruppe Michiels, Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, GermanySearch for more papers by this author First published: June 1996 https://doi.org/10.1111/j.1601-5223.1996.00007.xCitations: 16 AboutPDF ToolsExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract We present a karyotypic survey of the European freshwater planarian Dugesia polychroa, detailing frequencies of diploid and polyploid forms from 35 localities in seven countries. In this hermaphroditic species, diploids reproduce sexually and polyploids by pseudogamous parthenogenesis. Previous laboratory studies have shown that the two reproductive modes can interbreed, which may lead to new tri-, tetra-, and pentaploid lineages. We found four pure sexual, 25 pure parthenogenetic, and six mixed populations. Although some polyploid populations consisted entirely of triploids, most contained triploid and tetraploid individuals. Pentaploids were rare and reported for the first time from the field. In most populations, the higher ploidy levels were represented by fewer individuals. Our results indicate that occasional fertilisation of parthenogenetic eggs leading to genome addition is responsible for the maintainance of polyploid forms in natural populations of D. polychroa. References Asker, S. and Jerling, L. 1992. Apomixis in Plants.— CRC Press, Inc. , Boca Raton , Florida Ball, I. R. 1969. Dugesia lugubris (Tricladida: Paludicola). 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Syst. 25: 71–96 Citing Literature Volume124, Issue1June 1996Pages 7-15 ReferencesRelatedInformation