Browsing by Author "Morgan, Dai K.J."

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  • Behavioural interactions and reasons for aggression between Australian magpies (Gymnorhina tibicen) and other birds in New Zealand

    Morgan, Dai K.J. (The University of Waikato, 2006)
    The Australian magpie (Gymnorhina tibicen; magpie hereafter) was introduced to New Zealand from 1864 in an attempt to help control pest invertebrates in pasture. Since the introductions, magpie populations have gradually ...
  • Biomass estimation of invasive fish

    Hicks, Brendan J.; Brijs, Jeroen; Daniel, Adam Joshua; Morgan, Dai K.J.; Ling, Nicholas (Lake Ecosystem Restoration New Zealand (LERNZ) & Department of Conservation, 2015)
    Invasive fish have a variety of effects on indigenous fish communities and freshwater ecosystems generally, and the magnitude of these effects is partly dependent on invasive fish biomass. For example, a koi carp biomass ...
  • Can redirected aggression explain interspecific attacks by Australian magpies on other birds?

    Morgan, Dai K.J.; Waas, Joseph R.; Innes, John G. (Brill, 2007)
    Attacks by participants of conflicts against a third party are referred to as redirected aggression. Usually the third party is a conspecific — few documented cases of redirected aggression against other species exist. The ...
  • Comparing plasma and faecal measures of steroid hormones in Adelie penguins Pygoscelis adeliae

    Ninnes, Calum Edward; Waas, Joseph R.; Ling, Nicholas; Nakagawa, Shinichi; Banks, Jonathan C.; Bell, Dudley G.; Bright, A.; Carey, P.W.; Chandler, J.; Hudson, Q.J.; Ingram, J.R.; Lyall, K.; Morgan, Dai K.J.; Stevens, Mark I.; Wallace, J.; Möstl, E. (Springer, 2010)
    Physiological measurements of both stress and sex hormones are often used to estimate the consequences of natural or human-induced change in ecological studies of various animals. Different methods of hormone measurement ...
  • Costs and effectiveness of different methods for capturing invasive fish

    Hicks, Brendan J.; Daniel, Adam Joshua; Ling, Nicholas; Morgan, Dai K.J.; Gauthier, Stephane (Lake Ecosystem Restoration New Zealand (LERNZ) & Department of Conservation, 2015)
    Comparisons of the effectiveness of different fishing techniques in non-wadeable habitats give insights into the relative abundance of invasive fish and native fish, which is important to provide evidence for changes in ...