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Effects of burn severity and time since fire on songbird communities in the northern boreal forest

  • Author / Creator
    Knaggs, Michelle
  • Wildfire shapes the boreal ecosystem in western Canada and thereby enhances and diminishes important breeding habitat for many songbird species. Two aspects of wildfire, burn severity and time since fire, fundamentally alter the forest structure that songbirds use. The objectives of this study were to test the effects of burn severity (control, unburned/ low, medium, and high) one and two years post-fire and time since fire (1 to >50 years post-fire) on songbirds in the Northwest Territories, Canada. Specifically, I quantified changes in species richness, community composition, functional diversity, and species-specific responses in uplands and peatlands using data from 777 sampling stations using autonomous recording units (ARUs). Species richness and function diversity were inversely related to burn severity. Community composition converged between uplands and peatlands when burn severity was high. Both species richness and functional diversity were significantly lower one year post-fire compared to controls (>50 years post-fire). Species richness was higher than unburned controls between 3 and 50 years post-fire, while functional diversity showed no other significant changes with time since fire. There was no shift in community composition with increasing time since fire. Results suggest that burn severity, time since fire, and their interactions with vegetation type have a noticeable, but not extreme influence, on the songbird community suggesting moderate resistant and high resilience to fire disturbances. Such information may prove useful in understanding responses to songbirds under different climate change and fire scenarios and thereby inform local conservation and management actions.

  • Subjects / Keywords
  • Graduation date
    2018-11
  • Type of Item
    Thesis
  • Degree
    Master of Science
  • DOI
    https://doi.org/10.7939/R3CJ8826X
  • License
    Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Master's
  • Department
    • Department of Renewable Resources
  • Specialization
    • Conservation Biology
  • Supervisor / co-supervisor and their department(s)
    • Nielsen, Scott (Renewable Resources)
    • Bayne, Erin (Biological Sciences)