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Memorial University - Electronic Theses and Dissertations 5
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TitleConservation of the endangered limestone endemic Salix jejuna : effects of anthropogenic disturbance on habitat and life history
AuthorRobinson, Julie L. (Julie Lee), 1979-
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 2010. Biology
Paginationviii, 150 leaves : ill. (some col.), col. maps.
SubjectEndangered plants--Conservation--Newfoundland and Labrador; Endemic plants--Conservation--Newfoundland and Labrador; Nature--Effect of human beings on--Newfoundland and Labrador; Willows--Conservation--Newfoundland and Labrador; Willows--Habitat--Newfoundland and Labrador
Degree GrantorMemorial University of Newfoundland. Dept. of Biology
Spatial CoverageCanada--Newfoundland and Labrador
NotesBibliography: leaves 81-89.
AbstractAnthropogenic disturbance has been shown to have negative impacts on the recovery of endangered or rare species. Specific recovery objectives for Salix jejuna, an endangered prostrate shrub endemic to the globally rare limestone barrens habitat of Newfoundland (Canada), include assessing the population dynamics of natural populations, understanding limiting factors, defining threats and mitigating controllable threats where possible. As a large portion of S. jejuna's habitat has been anthropogenically-disturbed, understanding the effects of disturbance on species persistence are central to promoting species recovery. -- An assessment of habitat features revealed that anthropogenically-disturbed substrates were more homogeneous than undisturbed, natural substrates, with more gravel, less exposed bedrock, decreased soil moisture, and increased nutrient content. Populations resident on anthropogenically-disturbed habitats tended towards a more "annual" dynamic, with a greater proportion of seedlings, lower levels of clonal growth, and a younger median age compared with populations on naturally-disturbed substrates. Therefore, specific recovery plans for S. jejuna should include the elimination of continual disturbances such as off-road vehicle use and the active restoration of disturbed habitat to restore natural ecosystem processes, to reflect adjacent undisturbed natural habitat, and to promote the clonal reproductive traits of natural populations.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifiera3497993
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(4.73 MB) --
CONTENTdm file name8488.cpd