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Colony expansion of Neckera pennata: modelled growth rate and effect of microhabitat, competition and precipitation
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
2004 (English)In: The Bryologist, ISSN 0007-2745, E-ISSN 1938-4378, Vol. 107, 293-301 p.Article in journal (Refereed) Published
Abstract [en]

We measured colony growth over a three year period in the obligate epiphytic moss Neckera pennata Hedw. in three forest sites in eastern Sweden. Increment in colony area was proportional to colony size; hence area growth was modelled with the exponential growth function. Growth was measured over four periods (ca 0.5 to 1 yr long), among these periods relative growth rate varied between 0 and 35% yr-1 with an annual growth rate of 13.6% for the whole studied period. Colony growth was correlated with precipitation during the periods and this relationship was used to calculate relative growth rate at normal precipitation. The regressed relative growth rate (18.2% yr-1) was utilized to model average colony growth over time, from establishment to a colony size of 250 cm2. The model was also used to estimate age of first reproduction, which occurred at a colony size of 12-79 cm2, corresponding to an estimated age of 19-29 yr. Precipitation was the most important variable explaining colony growth, but some other factors were also of significant importance. Cover of other epiphytes surrounding the colony had a clear negative impact on growth of the N. pennata colonies, which we interpret as interference competition. Our study suggests that N. pennata was forced up the stem by stronger competitors and that growth position up to 170 cm did not impair growth. However, neither the tree species, bark pH, soil moisture, nor forest site affected colony growth, suggesting that occurrence of N. pennata was restricted by establishment rather than by growth.

Place, publisher, year, edition, pages
2004. Vol. 107, 293-301 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-91963OAI: oai:DiVA.org:uu-91963DiVA: diva2:164881
Available from: 2004-09-02 Created: 2004-09-02 Last updated: 2013-12-09
In thesis
1. Establishment, Growth and Population Dynamics in two Mosses of Old-growth Forests
Open this publication in new window or tab >>Establishment, Growth and Population Dynamics in two Mosses of Old-growth Forests
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Biodiversity in forests depends on long canopy continuity and existence of different elements which function as substrates for varying organisms. Bryophytes often occupy specific substrates with a patchy distribution. The aim of this thesis was to increase the ecological knowledge about two threatened moss species; Buxbaumia viridis, inhabiting decaying wood, and Neckera pennata, inhabiting bark of base-rich deciduous trees.

Establishment from spores was investigated in Buxbaumia viridis and Neckera pennata and models were created to predict germination of spores as a function of pH and water potential. The effects of pH, phosphorus and nitrogen concentration were studied in Buxbaumia viridis, both on spore germination and on sporophyte occurrences in the field. Colony growth in relation to precipitation and microhabitat variables was studied in Neckera pennata, and a model was used to predict growth of colonies over time. Metapopulation dynamics of Buxbaumia viridis were analyzed as an effect of precipitation, habitat quality and patch quantity. A spatial explicit patch occupancy model was constructed to simulate metapopulation sizes and extinction risk over 100 years.

The quality of the substrate was very important for spore establishment. Germination success increased with increasing pH in both species. Buxbaumia viridis was less sensitive to low pH than Neckera pennata when water was freely available. However, there was a strong interaction between pH and water potential in prediction of the final cumulative germination: the spores reacted positively to one factor only when the other factor was in a favourable range.

Precipitation, moisture holding capacity and interference competition were the main factors affecting colony growth of Neckera pennata. Buxbaumia viridis showed large fluctuations in number of occupied patches among years. Both colonizations and extinctions were highly related to precipitation. Spore germination and sporophyte occurrences in the field were positively related to phosphorus concentration and pH of the substrate.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 47 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 996
Keyword
Biology, Buxbaumia viridis, Neckera pennata, bryophyte, pH, phosphorus, water potential, precipitation, metapopulation, environmental stochasticity, ecology, plant, Biologi
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-4446 (URN)91-554-6006-2 (ISBN)
Public defence
2004-09-23, The lecture hall, Dept. of Plant Ecology, Villavägen 14, Uppsala, 10:00
Opponent
Supervisors
Available from: 2004-09-02 Created: 2004-09-02Bibliographically approved

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Rydin, Håkan

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