Sex ratio rather than population size affects genetic diversity in Antennaria dioica

dc.cibjournalPlant Biologyen_ZA
dc.cibprojectNAen_ZA
dc.contributor.authorRosche, C.
dc.contributor.authorSchrieber, K.
dc.contributor.authorLachmuth, S.
dc.contributor.authorDurka, W.
dc.contributor.authorHirsch, H.
dc.contributor.authorWagner, V.
dc.contributor.authorSchleuning, M.
dc.contributor.authorHensen, I.
dc.date.accessioned2018-08-03T11:09:52Z
dc.date.accessioned2021-08-30T10:00:41Z
dc.date.available2018-08-03T11:09:52Z
dc.date.available2021-08-30T10:00:41Z
dc.date.issued2018
dc.description.abstract• Habitat fragmentation and small population size can lead to genetic erosion in threatened plant populations. Classical theory implies that dioecy can counteract genetic erosion as it decreases the magnitude of inbreeding and genetic drift due to obligate outcrossing. However, in small populations, sex ratios may be strongly male- or female-biased, leading to substantial reductions in effective population size. This may theoretically result in a unimodal relationship between sex ratios and genetic diversity;yet, empirical studies on this relationship are scarce. • Using AFLP markers, we studied genetic diversity, structure and differentiation in 14 highly fragmented Antennaria dioica populations from the Central European lowlands. Our analyses focused on the relationship between sex ratio, population size and genetic diversity. • Although most populations were small (mean: 35.5 patches), genetic diversity was moderately high. We found evidence for isolation-by-distance, but overall differentiation of the populations was rather weak. Females dominated 11 populations, which overall resulted in a slightly female-biased sex ratio (61.5%). There was no significant relationship between population size and genetic diversity. The proportion of females was not unimodally but positively linearly related to genetic diversity. • The high genetic diversity and low genetic differentiation suggest that A. dioica has been widely distributed in the Central European lowlands in the past, while fragmentation occurred only in the last decades. Sex ratio has more immediate consequences on genetic diversity than population size. An increasing proportion of females can increase genetic diversity in dioecious plants, probably due to a higher amount of sexual reproduction.en_ZA
dc.identifier.citationRosche, C.; Schrieber, K.; Lachmuth, S.; Durka, W.; Hirsch, H.; Wagner, V.; Schleuning, M.; Hensen, I. (2018) Sex ratio rather than population size affects genetic diversity in Antennaria dioica. Plant Biology, 20(4): 789-796en_ZA
dc.identifier.issn1435-8603en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/122689
dc.language.isoenen_ZA
dc.publisherGerman Society for Plant Sciences and The Royal Botanical Society of the Netherlandsen_ZA
dc.subjectAFLPen_ZA
dc.subjectbiased sex rationen_ZA
dc.subjectfragmentationen_ZA
dc.subjectgenetic differentiationen_ZA
dc.subjectgenetic diversityen_ZA
dc.subjectgenetic erosionen_ZA
dc.subjectsmall population sizeen_ZA
dc.titleSex ratio rather than population size affects genetic diversity in Antennaria dioicaen_ZA
dc.typeJournalArticlesen_ZA
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