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UBC Theses and Dissertations
The relative effect of clipping, neighbours, and fertilization on the population dynamics of Lupinus arcticus (Family Fabaceae) Graham, Stepanie Ann
Abstract
A demographic study was conducted in 1991 and 1992 on replicated field populations of Lupinus arcticus, near Kluane Lake, Yukon. The relative effects of herbivory, neighbours, and soil fertility level were assessed using a factorial experiment of +/- clipping, +/- neighbour removal, and +/- fertilizer (NPK). The main population experiment monitored the dynamics of leaves, however, data on reproduction, survival, and size were also collected from the permanent quadrats. Clipping reduced leaf cohort survivorship, total leaf density, and the incidence of disease on leaves, but resulted in an increased standing crop of leaves. Removing neighbours increased the percent cover of L. arcticus and decreased total leaf mortality. Fertilizing increased the incidence of disease on leaves, and reduce the standing crop of leaves. Significant three-way interactions between treatments affected the plasticity of petiole length distributions for L. arcticus. Between-year differences in the responses to the treatments were also detected, particularly for reproductive investment and output in L. arcticus. Although a number of significant responses to treatments were detected, nevertheless, the overall tendency was for a lack of response, especially pertaining to leaf population dynamics. This low response to the treatments imposed is consistent with Grime’s (1979) arguments that plants growing in low productivity, infrequently disturbed habitats (i.e. stressful sensu Grime 1979) should show little response to short-term changes in local environmental conditions.
Item Metadata
| Title |
The relative effect of clipping, neighbours, and fertilization on the population dynamics of Lupinus arcticus (Family Fabaceae)
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| Creator | |
| Publisher |
University of British Columbia
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| Date Issued |
1994
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| Description |
A demographic study was conducted in 1991 and 1992 on replicated field populations of
Lupinus arcticus, near Kluane Lake, Yukon. The relative effects of herbivory, neighbours, and
soil fertility level were assessed using a
factorial experiment of +/- clipping, +/- neighbour removal, and +/- fertilizer (NPK). The main population experiment monitored the dynamics of
leaves, however, data on reproduction, survival, and size were also collected from the permanent
quadrats. Clipping reduced leaf cohort survivorship, total leaf density, and the incidence of
disease on leaves, but resulted in an increased standing crop of leaves. Removing neighbours
increased the percent cover of L. arcticus and decreased total leaf mortality. Fertilizing increased
the incidence of disease on leaves, and reduce the standing crop of leaves. Significant three-way
interactions between treatments affected the plasticity of petiole length distributions for L.
arcticus. Between-year differences in the responses to the treatments were also detected,
particularly for reproductive investment and output in L. arcticus.
Although a number of significant responses to treatments were detected, nevertheless, the
overall tendency was for a
lack of response, especially pertaining to leaf population dynamics.
This low response to the treatments imposed is consistent with Grime’s (1979) arguments that
plants growing in low productivity, infrequently disturbed habitats (i.e. stressful sensu Grime
1979) should show little response to short-term changes in local environmental conditions.
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| Extent |
3557731 bytes
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| Genre | |
| Type | |
| File Format |
application/pdf
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| Language |
eng
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| Date Available |
2009-03-02
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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 |
10.14288/1.0087483
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| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
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| Graduation Date |
1994-11
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| Campus | |
| Scholarly Level |
Graduate
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| Aggregated Source Repository |
DSpace
|
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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.