Rhizopogon mycorrhizal networks with interior douglas-fir in selectively harvested and non-harvested forests
department or school: Arts and Sciences, Irving K. Barber School of (Okanagan)
department or school: Biology, Department of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Van Dorp, Carrie
issued: 2016-06-06T19:14:56Z
issued: 2016
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Rhizopogon vesiculosus and Rhizopogon vinicolor are sister species of ectomycorrhizal fungi that associate exclusively with Douglas-fir (DF). My first objective was to determine whether a change in the number or relative abundance of R. vesiculosus and R. vinicolor tubercules and genotypes was related to a change in the percent of DF in a regenerating phase (<50 years-old). The number of R. vesiculosus tubercules correlated positively with an increasing proportion of DF in a regenerating phase, while the number of R. vinicolor tubercules was similar across all age structures. The number of R. vesiculosus genotypes did not correlate with age structure, whereas the number of R. vinicolor genotypes showed a negative relationship with an increasing proportion of DF in a regenerating phase. When numbers of R. vesiculosus tubercules and genotypes were expressed as a relative abundance of the two species, there was a positive correlation with an increasing proportion of DF in a regenerating phase for both genotypes and tubercules. Results suggest that the degree of DF regeneration or ecosystem factors related to DF regeneration affect the population dynamics of R. vesiculosus and R. vinicolor differently. My second objective was to quantify and compare the extent of Rhizopogon mycorrhizal networks in selectively logged (25 years-old) and non-logged plots. The networks of the harvested plots, when including both Rhizopogon species, were as highly connected as the undisturbed plots. However, they differed in that they had two Rhizopogon species rather than one and had a higher node density. R. vinicolor networks of harvested and unharvested forests had very different link densities. When I accounted for density differences, networks of both treatments were not significantly different, apart from a greater vulnerability to fragmentation in harvested forests than in undisturbed forest. When R. vesiculosus was included in the analysis, both treatments had similar connectivity a…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/58246
note: Rhizopogon Mycorrhizal Networks With Interior Douglas-fir In Selectively Harvested And Non-Harvested Forests by Carrie Van Dorp A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Master of Science in THE COLLEGE OF GRADUATE STUDIES (Biology) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) April 2016 ©Carrie Van Dorp, 2016 The undersigned certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis entitled: Rhizopogon Mycorrhizal Networks with Interior Douglas-Fir in Selectively Harvested and Non-Harvested Forests Submitted by Carrie Van Dorp in partial fulfillment of the requirements of The degree of Master of Science in Biology . Dr. Daniel Durall, UBCO, IKBSAS, Unit 2 Supervisor, Professor (please print name and faculty/school above the line) Dr. Michael Russello, UBCO, IKBSAS, Unit 2 Supervisory Committee Member, Professor (please print name and faculty/school in the line above) Dr. Suzanne Simard, UBCV, Forest Science Supervisory Committee Member, Professor (please print name and faculty/school in the line above) Dr. Kevin Hanna, UBCO, IKBSAS, Unit 7 University Examiner, Professor (please print name and faculty/school in the line above) External Examiner, Professor (please print name and university in the line above) April 26, 2016 (Date submitted to Grad Studies) iii Abstract Rhizopogon vesiculosus and Rhizopogon vinicolor are sister species of ectomycorrhizal fungi that associate exclusively with Douglas-fir (DF). My first objective was to determine whether a change in the number or relative abundance of R. vesiculosus and R. vinicolor tubercules and genotypes was related to a change in the percent of DF in a regenerating phase (<50 years-old). The number of R. vesiculosus tubercules correlated positively with an increasing proportion of DF in a regenerating phase, while the number of R. vinicolor tubercules was similar across all age structures. The number of R. vesiculosus genotypes did no…
has type: Thesis/Dissertation
date issued: 2016-09
is shown at: 10.14288/1.0304573
language: eng
degree discipline: Biology
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/58246