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Plant Population Dynamics and Biotic Interactions in two Forest Herbs
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Evolutionary Biology, Evolutionary Biology.
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In Sweden today, deciduous woodlands are often restricted to small isolated remnants of what it once was. Managing practices have changed concerning both cattle grazing and logging. Thus, dispersal, habitat requirements and their importance for forest species distributions become a relevant issue. Most of the species found in the deciduous flora are perennial herbs. I have examined population dynamics in the forest perennial Sanicula europaea, and its relation to environmental factors such as grazing, competition and spatial and temporal variation in such factors. Moreover I examined species distributions in relation to dispersal and habitat suitability in S. europaea and Dentaria bulbifera. To understand mechanisms behind the observed patterns I performed a number of experiments.

The results clearly demonstrated that the distribution and abundance of S. europaea was not dispersal limited, whereas the opposite held true for D. bulbifera. Moreover, mollusc exclusion increased recruitment thus influencing population dynamics in D. bulbifera. Leaf losses had negative effects on S. europaea individuals. These negative effects depended both on the extent, frequency and timing of the leaf losses and early losses were more severe than late. Population level effects of grazing were not negative as negative direct effects were counterblanced by positive indirect effects. The positive effects of grazing were mainly in terms of an increased recruitment.

In S. europaea, high variation in a life cycle transition was always coupled to low elasticity, and traits that varied much due to the examined environmental factors had little importance to population growth rate. A population level perspective is required to assess total effects of environmental factors. In perennial organisms such evaluations need to calculate integrated measures of the effects over the entire life cycle. Field studies spanning several years and demographic models are important to achieve these objectives.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2003. , p. 21
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 802
Keywords [en]
Developmental biology, Sanicula europaea, Dentaria bulbifera, Cost of reproduction, grazing, competition, dispersal limitation, patch suitability
Keywords [sv]
Utvecklingsbiologi
National Category
Developmental Biology
Research subject
Ecological Botany
Identifiers
URN: urn:nbn:se:uu:diva-3285ISBN: 91-554-5523-9 (print)OAI: oai:DiVA.org:uu-3285DiVA, id: diva2:162321
Public defence
2003-03-07, The lecture hall, Dep. of Plant Ecology, Villavägen 14, Uppsala, Uppsala, 10:00
Opponent
Available from: 2003-02-14 Created: 2003-02-14Bibliographically approved
List of papers
1. Flowering and cost of reproduction in the perennial herb Sanicula europaea.
Open this publication in new window or tab >>Flowering and cost of reproduction in the perennial herb Sanicula europaea.
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-90109 (URN)
Available from: 2003-02-14 Created: 2003-02-14 Last updated: 2010-01-13Bibliographically approved
2. Recruitment in Dentaria bulbifera; the roles of dispersal, habitat quality and mollusc herbivory
Open this publication in new window or tab >>Recruitment in Dentaria bulbifera; the roles of dispersal, habitat quality and mollusc herbivory
2002 In: Journal of Vegetation Science, Vol. 13, p. 719-724.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-90110 (URN)
Available from: 2003-02-14 Created: 2003-02-14Bibliographically approved
3. Seed availability and recruitment of the perennial herb Sanicula europaea
Open this publication in new window or tab >>Seed availability and recruitment of the perennial herb Sanicula europaea
2002 In: Ecoscience, Vol. 9, p. 526-532.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-90111 (URN)
Available from: 2003-02-14 Created: 2003-02-14Bibliographically approved
4. Effects of intraspecific and interspecific density on the demography of a perennial herb, Sanicula europaea
Open this publication in new window or tab >>Effects of intraspecific and interspecific density on the demography of a perennial herb, Sanicula europaea
2003 In: Oikos, Vol. 100, p. 317-324.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-90112 (URN)
Available from: 2003-02-14 Created: 2003-02-14Bibliographically approved
5. The effect of timing and amount of leaf removal on survival, growth and reproduction in the perennial herb Sanicula europaea
Open this publication in new window or tab >>The effect of timing and amount of leaf removal on survival, growth and reproduction in the perennial herb Sanicula europaea
Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-90113 (URN)
Available from: 2003-02-14 Created: 2003-02-14Bibliographically approved
6. Population dynamics and grazing in the perennial herb Sanicula europaea
Open this publication in new window or tab >>Population dynamics and grazing in the perennial herb Sanicula europaea
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-90114 (URN)
Available from: 2003-02-14 Created: 2003-02-14 Last updated: 2010-01-13Bibliographically approved

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Citation style
  • apa
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Output format
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