• An inexpensive and open-source method to study large terrestrial animal diet and behaviour using time-lapse video and GPS

      de la Rosa, Carlos A. (2019)
      The behaviour of free-ranging animals is difficult to study, especially on the large spatial and temporal scales relevant to long-lived large species. Animal-borne video and environmental data collection systems (AVEDs) record behaviour and other data in real time as animals conduct daily activities....
    • Impact of ungulate exclusion on understorey succession in relation to forest management in the Intermountain Western United States

      Pekin, Burak K.; Endress, Bryan A.; Wisdom, Michael J.; Naylor, Bridgett J.; Parks, Catherine G. (2015)
      ...The strength and direction of specific vegetation and diversity responses to ungulate exclusion vary with forest management, and the influence of ungulate exclusion on plant succession is more pronounced in recently thinned and burned sites. Management of wild and domestic ungulates thus needs to account for forest management activities that alter vegetation seral stage and increase the sensitivity of vegetation to the ungulate grazing regime....
    • Mapping the ecological footprint of large livestock overlapping with wildlife in Kenyan pastoralist landscapes

      O'Connor, David; Butt, Bilal; Foufopoulos, Johannes B. (2016)
      ...This study examines the efficacy using GPS collars to measure the spatial ecology and browsing orbits of camels in a pastoralist setting (primarily cattle and camels) as a means to measure overlap with wildlife....
    • Ungulate browsing maintains shrub diversity in the absence of episodic disturbance in seasonally-arid conifer forest

      Pekin, Burak K.; Wisdom, Michael J.; Endress, Bryan A.; Naylor, Bridgett J.; Parks, Catherine G. (2014)
      Ungulates exert a strong influence on the composition and diversity of vegetation communities. However, little is known about how ungulate browsing pressure interacts with episodic disturbances such as fire and stand thinning. We assessed shrub responses to variable browsing pressure by cattle and elk in fuels treated (mechanical removal of fuels followed by prescribed burning) and non-fuels treated forest sites in northeastern Oregon, US. Seven treatment paddocks were established at each site; three with cattle exclusion and low, moderate and high elk browsing pressure, three with elk exclusion and low, moderate and high cattle browsing pressure, and one with both cattle and elk exclusion. The height, cover and number of stems of each shrub species were recorded at multiple plots within each paddock at the time of establishment and six years later. Changes in shrub species composition over the six year period were explored using multivariate analyses. Generalized Linear Mixed Models were used to determine the effect of browsing pressure on the change in shrub diversity and evenness. Vegetation composition in un-browsed paddocks changed more strongly and in different trajectories than in browsed paddocks at sites that were not fuels treated. In fuels treated sites, changes in composition were minimal for un-browsed paddocks. Shrub diversity and evenness decreased strongly in un-browsed paddocks relative to paddocks with low, moderate and high browsing pressure at non-fuels treated sites, but not at fuels treated sites. These results suggest that in the combined absence of fire, mechanical thinning and ungulate browsing, shrub diversity is reduced due to increased dominance by certain shrub species which are otherwise suppressed by ungulates and/or fuels removal. Accordingly, ungulate browsing, even at low intensities, can be used to suppress dominant shrub species and maintain diversity in the absence of episodic disturbance events.