Browsing by UP Author "Hofmeyr, G.J. Greg (Gordon John Gregory)"

Browsing by UP Author "Hofmeyr, G.J. Greg (Gordon John Gregory)"

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  • At-sea behaviour of three krill predators breeding at Bouvetøya—Antarctic fur seals, macaroni penguins and chinstrap penguins 
    Blanchet, Marie-Anne; Biuw, Martin; Hofmeyr, G.J. Greg (Gordon John Gregory); De Bruyn, P.J. Nico; Lydersen, Christian; Kovacs, Kit M., 1956- (Inter-Research Science, 2013-03)
    Interspecific competition is an important structuring element in marine ecosystems, especially in the Southern Ocean which offers few prey choices to comparatively large predator populations. We present the first ...
  • Confirmation of the occurrence of a second killer whale morphotype in South African waters 
    Best, Peter B.; Meyer, M.A.; Thornton, Meredith; Kotze, P.G.H.; Seakamela, S.M.; Hofmeyr, G.J. Greg (Gordon John Gregory); Wintner, S.; Weland, C.D.; Steinke, D. (Taylor & Francis, 2014)
    Killer whales Orcinus orca occur worldwide in a number of morphotypes that differ in size, pigmentation, acoustic behaviour, food type and genetics – some may indeed warrant subspecific or even specific status. Until ...
  • Evidence for density dependent population regulation in southern elephant seals in the southern Indian Ocean 
    Pistorius, Pierre Anton; Taylor, F.E.; Bester, Marthan Nieuwoudt; Hofmeyr, G.J. Greg (Gordon John Gregory); Kirkman, Steve P. (Stephen Patrick) (Zoological Society of Southern Africa, 2008-04)
    The means by which populations are regulated form a central theme in conservation biology, and much debate has revolved around density dependence as a mechanism driving population change. Marion Island (46o54'S, 37o45'E) ...
  • Instrumentation and handling effects on Antarctic fur seals (Arctocephalus gazella) 
    Blanchet, Marie-Anne; Lydersen, Christian; Biuw, Martin; De Bruyn, P.J. Nico; Hofmeyr, G.J. Greg (Gordon John Gregory); Krafft, Bjørn A.; Kovacs, Kit M., 1956- (Co-Action Publishing, 2014)
    The use of biologging instruments has greatly improved our understanding of the behaviour, physiology and ecology of free-ranging marine mammals. However, handling wild animals and attaching instruments to streamlined bodies ...
  • Intra-archipelago moult dispersion of southern elephant seals at the Prince Edward Islands, southern Indian Ocean 
    Oosthuizen, Wessel Christiaan; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico; Hofmeyr, G.J. Greg (Gordon John Gregory) (NISC, 2009)
    During three summer surveys at Prince Edward Island (PEI), southern Indian Ocean (2001, 2004 and 2008), 416 southern elephant seals Mirounga leonina were inspected for identification tags. In all, 42 seals that had been ...
  • Intraspecific differences in the diet of Antarctic fur seals at Nyrøysa, Bouvetøya 
    Hofmeyr, G.J. Greg (Gordon John Gregory); Bester, Marthan Nieuwoudt; Kirkman, Steve P. (Stephen Patrick); Lydersen, Christian; Kovacs, Kit M., 1956- (Springer, 2010-06)
    Intraspecific differences in the diets of many species of pinnipeds are to be expected in view of the great differences in morphology, life history and foraging behaviour between the sexes of many species. We examined the ...
  • Long-range migration of a chinstrap penguin from Bouvetøya to Montagu Island, South Sandwich Islands 
    Biuw, Martin; Lydersen, Christian; De Bruyn, P.J. Nico; Arriola, Aline; Hofmeyr, G.J. Greg (Gordon John Gregory); Kritzinger, Petrus; Kovacs, Kit M., 1956- (Cambridge University Press, 2010-03)
    We describe a long-range migration of a pre-moulting adult chinstrap penguin from Bouvetøya, a small relatively recently established colony, to the South Sandwich Islands, where large, established colonies of this species ...
  • Occurrence of vagrant leopard seals, Hydrurga leptonyx, along the South African coast 
    Vinding, Katja; Christiansen, Michael; Hofmeyr, G.J. Greg (Gordon John Gregory); Chivell, Wilfred; Mcbride, Roy; Bester, Marthan Nieuwoudt (Southern African Wildlife Management Association, 2013-04)
    Leopard seals inhabit the pack-ice rim of Antarctica, and they regularly haul out on Antarctic and Subantarctic islands. Occasionally, vagrants are sighted further north in South America, Australia, New Zealand, and ...
  • Post-breeding at-sea movements of three central-place foragers in relation to submesoscale fronts in the Southern Ocean around Bouvetøya 
    Lowther, Andrew D.; Lydersen, Christian; Biuw, Martin; De Bruyn, P.J. Nico; Hofmeyr, G.J. Greg (Gordon John Gregory); Kovacs, Kit M. (Cambridge University Press, 2014)
    At-sea behaviour of central-place foraging fur seals and penguins in the Southern Ocean is understudied during the latter stages of parental care and the subsequent pre-moulting period. This biologically important period ...
  • Vagrant subantarctic fur seal on the coast of Tanzania 
    Hofmeyr, G.J. Greg (Gordon John Gregory); Amir, Omar A. (Zoological Society of Southern Africa, 2010-04)
    An immature Subantarctic fur seal was sighted on Unguja Island, Zanzibar, Tanzania, in 2008. This is the most northerly record of a vagrant of this species. The nearest breeding colony is on the Prince Edward Islands, ...