dc.contributor.advisor | Leuschner, Christoph Prof. Dr. | |
dc.contributor.author | Schwerbrock, Robin | |
dc.date.accessioned | 2017-10-18T09:21:37Z | |
dc.date.available | 2017-10-18T09:21:37Z | |
dc.date.issued | 2017-10-18 | |
dc.identifier.uri | http://hdl.handle.net/11858/00-1735-0000-0023-3F39-9 | |
dc.identifier.uri | http://dx.doi.org/10.53846/goediss-6535 | |
dc.language.iso | deu | de |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.subject.ddc | 570 | de |
dc.title | Vulnerability analysis of the rare woodland fern Polystichum braunii (Dryopteridaceae) in Germany | de |
dc.type | doctoralThesis | de |
dc.contributor.referee | Leuschner, Christoph Prof. Dr. | |
dc.date.examination | 2016-10-22 | |
dc.description.abstracteng | Background: 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.coReferee | Hauck, Markus Prof. Dr. | |
dc.subject.eng | Polystichum braunii, air humidity, climate chamber experiment, climate change, foliar water uptake | de |
dc.identifier.urn | urn:nbn:de:gbv:7-11858/00-1735-0000-0023-3F39-9-0 | |
dc.affiliation.institute | Biologische Fakultät für Biologie und Psychologie | de |
dc.subject.gokfull | Biologie (PPN619462639) | de |
dc.identifier.ppn | 1002330726 | |