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Time-lagged lichen extinction in retained buffer strips 16.5 years after clear-cutting
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. CJEW Ecology and Environmental Consultancy, Åkervägen 30, SE-943 33 Öjebyn, Sweden.
2018 (English)In: Biological Conservation, ISSN 0006-3207, E-ISSN 1873-2917, Vol. 225, p. 53-65Article in journal (Refereed) Published
Abstract [en]

Tree retention on clear-cuts is a relatively new measure in forestry aimed at lifeboating' forest species during young seral periods. However, the effectiveness of tree retention for maintaining biodiversity for more than a few years is still poorly known. We investigated lichen persistence in retained buffer strips along small streams after clear-cutting of the surrounding forest, and compared with clear-cuts and un-cut references. Specifically, we compared richness and frequency of red-listed/signal species, calicioids and pendulous species before clear cutting with 2.5 years and 16.5 years after clear-cutting, and also analysed their colonization-extinction dynamics over time. The results show that the richness of red-listed/signal species and calicioids in buffer strips had declined significantly after 16.5 years, but not after 2.5 years, while frequency displayed a significant difference already after 2.5 years. The richness of pendulous lichens remained relatively stable over time, but the frequency had declined significantly after 16.5 years. In clear-cuts all groups declined more than in buffer-strips (-2-3.5 times more) and the main decline had occurred already after 2.5 years. References remained stable over time. The colonization-extinctions dynamics reflected the richness declines, with high early extinction in clear cuts and lower but late extinction in buffer-strips, and low (re)colonization. We conclude that retained buffer strips cannot maintain lichen richness over time due to time-lagged extinction, but they are clearly more effective than clear-cuts. Wider buffer strips could potentially reduce tree mortality and decrease lichen extinction. The large amounts of standing dead wood makes buffer strips potential future colonization targets.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 225, p. 53-65
Keywords [en]
Boreal forest, Calicloid, Colonization, Extinction debt, Pendulous, Tree retention
National Category
Environmental Sciences related to Agriculture and Land-use
Identifiers
URN: urn:nbn:se:umu:diva-151534DOI: 10.1016/j.biocon.2018.06.016ISI: 000442003900006OAI: oai:DiVA.org:umu-151534DiVA, id: diva2:1248241
Funder
Carl Tryggers foundation , CTS 14:226Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2018-09-14Bibliographically approved

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CiteExportLink to record
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