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Distribution Patterns and Metapopulation Dynamics of Epiphytic Mosses and Lichens
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Evolutionary Biology.
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis examines the relative importance of local conditions, dispersal and dynamics of the trees on epiphyte distribution patterns and colonization-extinction dynamics. Study species are the mosses Orthotrichum speciosum and O. obtusifolium, and the red-listed Neckera pennata. The thesis also includes an attempt to parameterize a model for a lichen metapopulation (Lobaria pulmonaria) in a dynamic landscape, based on only presence/absence data of the epiphyte and its host trees.

The results show that epiphyte colonization of trees is affected by both local conditions, and by connectivity to occupied trees. The positive effect of connectivity, implying a restricted dispersal range, was established by both demographic and genetic studies. The important local conditions were tree diameter and vitality, and shade. Local extinctions from trees occurred among small trees with low local epiphyte abundance, but more often, were the results of tree fall.

The observed importance of connectivity on epiphyte colonization agrees with the assumptions of the classic metapopulation model. However, the classic metapopulation model assumes that the landscape is static, and that local extinctions occur for stochastic reasons. The dynamics of epiphytes are different. A new conceptual model is therefore suggested, the patch-tracking metapopulation model. It differs from the classic metapopulation model in that it includes dynamics of the patches, and in that local extinctions only occur as patches are destroyed.

Simulations of the dynamics of N. pennata showed that its future metapopulation size will be overestimated unless the dynamics of the trees are accounted for. The simulation results further suggest that the dynamics of N. pennata can be characterised by the patch-tracking metapopulation model.

The attempt to parameterize the L. pulmonaria metapopulation model showed that more information are required for rigorous parameterization, preferably of the past historic fire regime.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2003. , p. 36
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 918
Keywords [en]
Ecology, plant, metapopulation, model, parameterization, connectivity, dispersal, colonization, extinction, epiphytic, bryophyte, lichen, boreal, fragmentation
Keywords [sv]
Ekologi
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-3904ISBN: 91-554-5833-5 (print)OAI: oai:DiVA.org:uu-3904DiVA, id: diva2:163845
Public defence
2004-01-16, The lecture hall, Dept. of Plant Ecology, Villavägen 14, Uppsala, 10:00
Opponent
Supervisors
Available from: 2003-12-19 Created: 2003-12-19Bibliographically approved
List of papers
1. Spatial occurrence and dispersal in patch-tracking metapopulations: local colonisation versus dispersal
Open this publication in new window or tab >>Spatial occurrence and dispersal in patch-tracking metapopulations: local colonisation versus dispersal
2003 (English)In: Oikos, ISSN 0030-1299, Vol. 103, no 3, p. 13-Article in journal (Refereed) Published
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-91190 (URN)
Available from: 2003-12-19 Created: 2003-12-19 Last updated: 2013-12-09
2. Spatial kinship structure and dispersal in two congeneric epiphytes with different dispersal strategies
Open this publication in new window or tab >>Spatial kinship structure and dispersal in two congeneric epiphytes with different dispersal strategies
Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-91191 (URN)
Available from: 2003-12-19 Created: 2003-12-19Bibliographically approved
3. Colonization and extinction dynamics of an epiphyte metapopulation in a dynamic landscape
Open this publication in new window or tab >>Colonization and extinction dynamics of an epiphyte metapopulation in a dynamic landscape
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91192 (URN)
Available from: 2003-12-19 Created: 2003-12-19 Last updated: 2010-01-13Bibliographically approved
4. Modeling epiphyte metapopulation dynamics in a dynamic forest landscape
Open this publication in new window or tab >>Modeling epiphyte metapopulation dynamics in a dynamic forest landscape
Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-91193 (URN)
Available from: 2003-12-19 Created: 2003-12-19Bibliographically approved

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