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The ecological genetics of gynodioecy in Silene acaulis L. (Caryophyllaceae): spatial sex structure and inbreeding depression

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dc.contributor.author Keller, Stephen Robert
dc.date.accessioned 2015-04-02T00:40:44Z
dc.date.available 2015-04-02T00:40:44Z
dc.date.issued 2002-12
dc.identifier.uri http://hdl.handle.net/11122/5233
dc.description Thesis (M.S.) University of Alaska Fairbanks, 2002 en_US
dc.description.abstract Gynodioecy, the co-occurrence of females and hermaphrodites, is considered an intermediate step in the evolution of separate sexes in flowering plants. Highly variable female frequencies among populations suggest structuring of sex determining genes and differences in the relative fitness of females and hermaphrodites as seed parents. I investigated spatial variability in sex ratio and the effects of inbreeding on offspring quality in Silene acaulis. Female frequencies varied among populations from 0.32 to 0.69, and most were at temporal equilibrium. Females were significantly clumped within two of six populations. Females produced from 4 to 27 times as many fruits as hermaphrodites. Self-pollination of hermaphrodites reduced offspring survivorship and growth by an average of 67% compared to outcrosses. Overall, spatial variation in female frequency suggests a role of founder events and local seed dispersal. Low fruit production and reduced quality of inbred offspring suggest hermaphrodites may be functioning primarily as pollen donors. en_US
dc.language.iso en_US en_US
dc.title The ecological genetics of gynodioecy in Silene acaulis L. (Caryophyllaceae): spatial sex structure and inbreeding depression en_US
dc.type Thesis en_US


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