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UBC Theses and Dissertations
Pioneer-climax tree competition models Sakai, Shūichi
Abstract
Tree species can be broadly categorized into two kinds: pioneer and climax. Pioneer species are ones that survive under low population densities, but progressively do worse as densities increase. Climax species, on the other hand, need some degree of neighboring population to survive, and have a maximum fitness at a unique population density, whereafter fitness decreases with increased competition. This thesis examines models of competition between these two species both in continuous and discrete time. Whereas popular belief is that the pioneer species become extinct with competition, the models studied here suggest the possibility of coexistence, either in a stable equilibrium or a periodic solution. Simple genetical variations on one or both species are also considered for their effects on coexistence. It is found that genetic variety can be a crucial factor in achieving coexistence between the two species.
Item Metadata
Title |
Pioneer-climax tree competition models
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1997
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Description |
Tree species can be broadly categorized into two kinds: pioneer and climax. Pioneer
species are ones that survive under low population densities, but progressively do worse
as densities increase. Climax species, on the other hand, need some degree of neighboring
population to survive, and have a maximum fitness at a unique population density,
whereafter fitness decreases with increased competition. This thesis examines models of
competition between these two species both in continuous and discrete time. Whereas
popular belief is that the pioneer species become extinct with competition, the models
studied here suggest the possibility of coexistence, either in a stable equilibrium or a
periodic solution. Simple genetical variations on one or both species are also considered
for their effects on coexistence. It is found that genetic variety can be a crucial factor in
achieving coexistence between the two species.
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Extent |
2505010 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-24
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0079779
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.