Memorial University DAI: Conservation of the endangered limestone endemic Salix jejuna : effects of anthropogenic disturbance on habitat and life history

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Title	Conservation of the endangered limestone endemic Salix jejuna : effects of anthropogenic disturbance on habitat and life history
Author	Robinson, Julie L. (Julie Lee), 1979-
Description	Thesis (M.Sc.)--Memorial University of Newfoundland, 2010. Biology
Date	2010
Pagination	viii, 150 leaves : ill. (some col.), col. maps.
Subject	Endangered 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	M.Sc.
Degree Grantor	Memorial University of Newfoundland. Dept. of Biology
Discipline	Biology
Language	Eng
Spatial Coverage	Canada--Newfoundland and Labrador
Notes	Bibliography: leaves 81-89.
Abstract	Anthropogenic 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.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	a3497993
Rights	The 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.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(4.73 MB) -- http://collections.mun.ca/PDFs/theses/Robinson_JulieL.pdf
CONTENTdm file name	8488.cpd