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Plant phenology in seasonal environments

Fogelström, Elsa, 1986- (författare)
Stockholms universitet,Institutionen för ekologi, miljö och botanik,Bolin Centre for Climate Research
Ehrlén, Johan, Professor (preses)
Stockholms universitet,Institutionen för ekologi, miljö och botanik,Bolin Centre for Climate Research, Stockholm University
Dahlgren, Johan P., Associate Professor (preses)
Department of Biology, University of Southern Denmark; Interdisciplinary Centre on Population Dynamics, University of Southern Denmark
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Weis, Arthur, Professor (opponent)
Department of Ecology & Evolutionary Biology, University of Toronto, Canada
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 (creator_code:org_t)
ISBN 9789177976769
Stockholm : Department of Ecology, Environment and Plant Sciences, Stockholm University, 2019
Engelska.
  • Doktorsavhandling (övrigt vetenskapligt)
Abstract Ämnesord
Stäng  
  • Phenology, or the seasonal timing life-history events such as emergence, reproduction and senescence will determine the outcome of interactions between plants and both abiotic and biotic aspects of the environment. Such timing is therefore of utmost importance for plants in seasonal environments. In this thesis, I first investigated the factors determining the start, end and length of the growing season for a perennial herb. Secondly, I estimated phenotypic selection on flowering time and investigated to which extent it corresponded to genotypic selection in a natural field setting. Thirdly, I estimated population differentiation in flowering time in a common garden and in the field. Lastly, I experimentally manipulated the synchrony of a perennial herb and its main herbivore to investigate the effects of herbivore phenological preference and plant-herbivore synchrony on the direction of selection on flowering time.I found that flowering individuals emerged earlier in spring than non-flowering individuals and that large individuals senesced later in autumn, suggesting that the length of the growing season is linked to individual condition and resource demands. Phenotypic selection favoured early-flowering individuals, but there was no genotypic selection. I found evidence for genetic population differentiation in flowering time in a common garden but not in the field. This suggests that, although flowering time has a genetic component, the observed variation in flowering time was mainly plastic under natural field conditions. Lastly, I show that constant herbivore preferences of plant phenology, in combination with environmentally driven variation in relative synchrony of the plant and the herbivore, leads to among-year variation in natural selection on flowering time. With this thesis, I contribute to identifying the factors affecting plant phenology as well as of the mechanisms shaping selection on flowering time in perennial plants. Such knowledge is essential for predicting species responses to climate change.

Ämnesord

NATURAL SCIENCES  -- Biological Sciences -- Ecology (hsv//eng)
NATURVETENSKAP  -- Biologiska vetenskaper -- Ekologi (hsv//swe)
NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Nyckelord

Autumn phenology
Cardamine pratensis
evolutionary ecology
heritability
herbivore preference
fitness components
flowering time
growing season length
life-history
Lathyrus vernus
natural selection
population differentiation
phenology
spring phenology
Plant Ecology
växtekologi

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dok (ämneskategori)

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