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Land reclamation by reindeer lichens: On the complexity of substrate and reindeer grazing on Cladonia spp. dispersal
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. 1991.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Reindeer lichens are on a dramatic decline in Sweden, with a 71 % decrease in abundance over the last 60 years. Reindeer (Rangifer tarandus tarandus L.) management, undertaken by indigenous Sámi people, depend upon extensive winter grazing grounds with abundant reindeer lichen cover. The objective of this pilot study is to restore the ecosystem function of reindeer winter grazing in post-industrial environments, by developing an artificial dispersal program of reindeer lichen thalli. This study is performed in co-operation with the mining corp. of LKAB and in consultation with Laevas reindeer herding district. There are two components to this study: I) a comprehensive literature review of indigenous and scientific knowledge regarding reindeer winter grazing and artificial reindeer lichen dispersal; and II) a field assessment of relationships between fructiose lichen occurrence and environmental variables within a coarse grid overlapped on a mosaic of vegetation patches in various successional stages, which cover part of a 28-year old abandoned quartzite heap. My findings validate that a well-drained substrate with a thin humus layer or barren ground together with the occurrence of bryophytes (not Sphagnum spp.) had the highest abundance of fructiose lichens. In contrast, abundant organic soil layer, high soil moisture, and extensive cover of graminoids and herbs showed low abundance of fructiose lichens. I conclude that reindeer lichens are indeed present in a few findings but are still facing environmental and dispersal limitations to become abundant. These limitations can be understood in the light of moisture regimes, instability or compaction of substrate, and limitations within the colonization-pool, and are further discussed with suggested revegetation implementations.

Place, publisher, year, edition, pages
2019. , p. 28
Keywords [en]
Artificial dispersal Quartzite quarry, Reindeer lichens, Reindeer winter grazing, Substrate.
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-158042OAI: oai:DiVA.org:umu-158042DiVA, id: diva2:1304155
External cooperation
LKAB
Educational program
Master's Programme in Ecology
Presentation
2019-03-25, 14:47 (English)
Supervisors
Examiners
Available from: 2019-04-27 Created: 2019-04-11 Last updated: 2019-05-07Bibliographically approved

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