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  • http://hdl.handle.net/10048/1135
  • Persistence and abundance of the Western Grebe (Aechmophorus occidentalis) in Alberta
  • Erickson, Mara E
  • en_US
  • Western Grebe
    Aechmophorus occidentalis
    persistence modelling
    abundance modelling
  • Apr 15, 2010 7:54 PM
  • Thesis
  • en_US
  • Adobe PDF
  • 1144769 bytes
  • The Western Grebe (Aechmophorus occidentalis, WEGR) is a Species of Special Concern in Alberta, declining in distribution and abundance. I evaluated how environmental variables including emergent vegetation, human developments, and prey availability affected WEGR persistence and abundance on 43 lakes in Alberta that historically supported WEGR. Persistence and abundance of WEGR were correlated, and both were positively associated with shoreline bulrush (Scirpus lacustris) and human development within a 500m buffer surrounding the lake, while inversely associated with surrounding forest. Bulrush provides important habitat for nesting, and WEGR are likely to occur on the same large fish-bearing lakes that humans prefer for recreation. However, this relationship with development puts grebes at risk for disturbance and habitat loss—a primary threat to endangered birds. I recommend shoreline vegetation be protected for the success of breeding grebes, and human activity around colonies should be kept to a minimum to curb further WEGR decline.
  • Master's
  • Master of Science
  • Department of Biological Sciences
  • Spring 2010
  • Boyce, Mark S. (Biological Sciences)
  • Bayne, Erin (Biological Sciences)
    Paszkowski, Cynthia (Biological Sciences)
    Found, Christine (Alberta Sustainable Resource Development)
    Foote, A. Lee (Renewable Resources)

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