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- W2124190187 abstract "Due to changes in land use, remnants ofunfertilised, nutrient-poor calcareousgrassland in the Swiss Jura are small in areaand are highly fragmented. We selected 89 seedfamilies from eleven populations of varioussizes of Scabiosa columbaria for a studyof molecular diversity, and used the samematerial in a greenhouse experiment to measurevariation in fitness-related traits and theability of populations to cope withcompetition. Using RAPD-PCR we detected 71RAPD-phenotypes among 87 genotypes. Moleculardiversity within populations was variable andrelatively high, with an expectedheterozygosity H e ranging from 0.09 to0.24. H e, the Shannon index (SI) and thepercentage of polymorphic bands were notcorrelated with population size, but thesmallest populations had the lowest moleculardiversity (H e, SI). Populationdifferentiation was moderate with 12% of themolecular diversity among populations. Measuresof fitness in the greenhouse differed amongseed families (P < 0.001), but not amongpopulations. Mean above-ground biomass waslargely reduced when plants had to compete withBromus. Mean fitness of populationsdecreased when molecular diversity (H e)was low, but only when plants had to competewith Bromus (P = 0.02). Accordingly, therelative competition ability of Scabiosaplants decreased when molecular diversity(H e) was low (P = 0.01). Our resultssuggest an increased risk of local extinctionof Scabiosa columbaria in the Swiss Juracaused by a decreased viability and reducedphenotypic plasticity due to genetic erosion insmall populations." @default.
- W2124190187 created "2016-06-24" @default.
- W2124190187 creator A5008305142 @default.
- W2124190187 creator A5055238346 @default.
- W2124190187 date "2004-01-01" @default.
- W2124190187 modified "2023-10-18" @default.
- W2124190187 title "Genetic diversity and fitness in Scabiosa columbaria in the Swiss Jura in relation to population size" @default.
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- W2124190187 doi "https://doi.org/10.1023/b:coge.0000029999.10808.c2" @default.
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