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Vulnerability analysis of the rare woodland fern Polystichum braunii (Dryopteridaceae) in Germany

dc.contributor.advisorLeuschner, Christoph Prof. Dr.
dc.contributor.authorSchwerbrock, Robin
dc.date.accessioned2017-10-18T09:21:37Z
dc.date.available2017-10-18T09:21:37Z
dc.date.issued2017-10-18
dc.identifier.urihttp://hdl.handle.net/11858/00-1735-0000-0023-3F39-9
dc.identifier.urihttp://dx.doi.org/10.53846/goediss-6535
dc.language.isodeude
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc570de
dc.titleVulnerability analysis of the rare woodland fern Polystichum braunii (Dryopteridaceae) in Germanyde
dc.typedoctoralThesisde
dc.contributor.refereeLeuschner, Christoph Prof. Dr.
dc.date.examination2016-10-22
dc.description.abstractengBackground: Various rare and endangered temperate ferns are being threatened by their recent population decline, but there is limited understanding of the causes behind it. Aims: This study attempted to identify the possible drivers of regional population decline and extinction in the globally distributed woodland fern Polystichum braunii. Methods: A comparison was undertaken of the climatic, edaphic and phytosociological characteristics of sites with increasing, decreasing or recently extinct populations in Germany. Results: A significantly higher frequency of episodes of low relative air humidity (<60 %) was found at sites with decreasing or extinct populations compared to habitats with population increases. Sites with decreasing or extinct populations were also characterised as having less summer precipitation (<500 mm year-1) and a shorter duration of snow cover (<110 days year-1) than sites with increasing populations. The latter had significantly higher moss cover (56 % of the forest floor), but less cover by a tree litter layer (23 %) compared to decreasing (36 % and 38 %) or recently extinct populations (22 % and 52 %). All increasing populations were located in intact Tilia - Acer ravine forests, while those suffering population decline were mostly located in Fagus-dominated forests. Conclusions: It was concluded that the probable causes of the recent decline in German P. braunii populations are reduced air humidity levels, decreasing snow duration or a shift from moss-covered to tree litter-covered forest floors due to climate warming or altered forest management.de
dc.contributor.coRefereeHauck, Markus Prof. Dr.
dc.subject.engPolystichum braunii, air humidity, climate chamber experiment, climate change, foliar water uptakede
dc.identifier.urnurn:nbn:de:gbv:7-11858/00-1735-0000-0023-3F39-9-0
dc.affiliation.instituteBiologische Fakultät für Biologie und Psychologiede
dc.subject.gokfullBiologie (PPN619462639)de
dc.identifier.ppn1002330726


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