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Population Differentiation in Solidago virgaurea along Altitudinal Gradients

Bergsten, Anna (author)
Uppsala universitet,Ekologisk botanik
Ågren, Jon (thesis advisor)
Uppsala universitet,Ekologisk botanik
Karlsson, Staffan (thesis advisor)
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Lehtilä, Kari (opponent)
Södertörns högskola
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 (creator_code:org_t)
ISBN 9789155475369
Uppsala : Acta Universitatis Upsaliensis, 2009
English 34 s.
Series: Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 ; 647
  • Doctoral thesis (other academic/artistic)
Abstract Subject headings
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  • Altitudinal gradients offer attractive opportunities for studies of population differentiation in response to environmental heterogeneity. In this thesis, I examined population differentiation along altitudinal gradients by combining common-garden experiments with field studies and experiments in alpine, subalpine and boreal populations of the perennial herb Solidago virgaurea. More specifically, I determined whether leaf physiology in terms of nitrogen concentration and resorption, flowering phenology, flower production and reproductive effort vary along altitudinal gradients. Nitrogen concentration in green leaves were higher in alpine than in subalpine and boreal populations. These differences persisted when plants were grown from seeds in a common-garden experiment at two sites, suggesting that the differences have a genetic component. There was mixed support for a trade-off between maximized carbon gain through the maintenance of high nitrogen concentration, and minimized nitrogen loss through high resorption. In their natural habitats alpine populations began flowering later than subalpine populations, but this difference was reversed when plants were grown in a common environment. This suggests that genetic differences among populations counteract environmental effects and reduce phenotypic variation in flowering time among populations. Flowering time thus shows countergradient genetic variation in S. virgaurea. In a common-garden experiment, boreal populations produced more flowers and had a higher reproductive effort than subalpine and alpine populations indicating habitat-specific genetic differences in reproductive allocation. In a field study, which included three populations, seed set was close to zero in the alpine population, intermediate in the subalpine population, and high in the boreal population. Experimental flower removal showed that seed production was associated with a considerable cost in terms of reduced flowering propensity the following year, but did not support the hypothesis that a large floral display is important for pollination success.

Subject headings

NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)
NATURVETENSKAP  -- Biologi -- Annan biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Other Biological Topics (hsv//eng)

Keyword

population differentiation
altitudinal gradient
plant nutrient status
resorption efficiency
resorption proficiency
flowering phenology
countergradient variation
reproductive effort
flower production
cost of reproduction
Biology
Biologi
Other biology
Övrig biologi
Ecological Botany
Ekologisk botanik

Publication and Content Type

vet (subject category)
dok (subject category)

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