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Calcicolous plants colonize limed mires after long-distance dispersal
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Number of Authors: 22018 (English)In: Journal of Biogeography, ISSN 0305-0270, E-ISSN 1365-2699, Vol. 45, no 4, p. 885-894Article in journal (Refereed) Published
Abstract [en]

Aim: Dispersal range is a key factor for understanding species' persistence in dynamic landscapes. However, dispersal, especially over long distances, is inherently difficult to study. Making use of a unique system of anthropogenically disturbed, geographically isolated mires, we assessed dispersal ranges for a group of plants restricted to wet calcareous conditions via empirical studies of colonization patterns. We hypothesized that more species would have colonized the less isolated mires and that colonization frequencies would be related to traits influencing propagule pressure. Location: Sweden. Taxon: Calcicolous vascular plants and bryophytes. Methods: The study system consisted of 52 acidic mires that had acquired a high pH through active liming by the Swedish government during the past two decades. These conditions killed off mat-forming peat mosses, rendering the mires open to colonization by other species. In each mire, we recorded the presence of rich fen plant species typically found in high pH wet soils throughout the country. We used citizen science-collected records of occurrences of obligate-rich fen species surrounding each mire to examine the likely dispersal distances that were involved in creating the colonization patterns. Results: A lower proportion of vascular plants than bryophytes from their respective species pools colonized the limed mires (27% vs. 67%, p = .001). The number of colonized rich fen species per site was 0-6 for vascular plants and 10-31 for bryophytes, and was positively related to potential diaspore sources >20km from the mires (p = .026 and p = .012, respectively). The proportion of colonized mires was positively related to the species' regional frequency, but not with their diaspores' terminal velocity. Main conclusions: Many bryophyte species can effectively disperse over long distances (tens of kilometres) and variation among species in total diaspore production seems to be an important regulator of colonization across landscapes, for both vascular plants and bryophytes, in communities that are open to colonization.

Place, publisher, year, edition, pages
2018. Vol. 45, no 4, p. 885-894
Keywords [en]
bryophytes, citizen science, colonization, dispersal, dispersal traits, propagule pressure, rich fen, source strength, spores, wind dispersal
National Category
Biological Sciences Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-156055DOI: 10.1111/jbi.13180ISI: 000428849000015OAI: oai:DiVA.org:su-156055DiVA, id: diva2:1210065
Available from: 2018-05-25 Created: 2018-05-25 Last updated: 2018-05-25Bibliographically approved

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