Search for dissertations about: "seedling size"
Showing result 1 - 5 of 15 swedish dissertations containing the words seedling size.
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1. Effects of seed size and habitat on recruitment patterns in grassland and forest plants
Abstract : A trade-off between seed size and seed number is central in seed ecology, and has been suggested to be related to a trade-off between competition and colonization, as well as to a trade-off between stress tolerance and fecundity. Large seeds endure hazards during establishment, such as shading, drought, litter coverage and competition from other plants, better than do small seeds, due to a larger amount of stored resources in the seed. READ MORE
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2. The role of regeneration in plant niche differentiation and habitat specialization
Abstract : To predict the effects of environmental change and nature management on the distribution of plant species, it is crucial to understand the mechanisms of plant niche differentiation and habitat specialization. The importance to habitat specialization of particular plant traits and requirement of the regenerative phase of the plants life has received scanty interest. READ MORE
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3. Genetic variation, clonal diversity and breeding system in sedges (Carex)
Abstract : In this thesis I investigate genetic variation in clonal plants within the wind-pollinated plant family Cyperaceae and, in particular, in species of Carex. Clonal diversity and the spatial distribution of clones (genets) within populations was investigated in Carex bigelowii (in Iceland and Scandinavia) and C. READ MORE
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4. Recruitment and understorey herb dynamics in deciduous and mixed coniferous forest
Abstract : The distribution and abundance of plant species is determined by the ability to disperse, recruit and persist in a suitable habitat. Plant-animal interactions influence recruitment by reducing seeds and seedlings through predation and herbivory. READ MORE
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5. Evolution of seed attributes, dispersal and population dynamics of plants,with special emphasis on fragmented habitats
Abstract : Theory predicts that life history traits that reduce the impact of environmental variation will exhibit a pattern of negative covariation (trade-offs). In plants, such traits are seed size, spatial seed dispersal and seed dormancy which interact to reduce risk in a variable environment. READ MORE