Browsing Research Articles (Mammal Research Institute) by UP Author "De Bruyn, P.J. Nico"

Browsing Research Articles (Mammal Research Institute) by UP Author "De Bruyn, P.J. Nico"

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  • Reisinger, Ryan Rudolf; De Bruyn, P.J. Nico; Bester, Marthan Nieuwoudt (Inter-Research, 2011-05-05)
    Killer whales Orcinus orca are apex predators known to have important effects on marine ecosystems. A fundamental step towards understanding their role in ecosystems, and vital for their informed management and conservation, ...
  • Postma, Martin; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico (Springer, 2013-05)
    Life history theory predicts a change in reproduction success with age as energy resources are limited and must be allocated effectively to maximise reproduction and survival. In this study we use three reproductive ...
  • Harcourt, Rob; Sequeira, Ana M.M.; Zhang, Xuelei; Roquet, Fabien; Komatsu, Kosei; Heupel, Michelle; McMahon, Clive; Whoriskey, Fred; Meekan, Mark; Carroll, Gemma; Brodie, Stephanie; Simpfendorfer, Colin; Hindell, Mark; Jonsen, Ian; Costa, Daniel P.; Block, Barbara; Muelbert, Monica; Woodward, Bill; Weise, Mike; Aarestrup, Kim; Biuw, Martin; Boehme, Lars; Bograd, Steven J.; Cazau, Dorian; Charrassin, Jean-Benoit; Cooke, Steven J.; Cowley, Paul; De Bruyn, P.J. Nico; Du Dot, Tiphaine Jeanniard; Duarte, Carlos; Eguíluz, Víctor M.; Ferreira, Luciana C.; Fernández-Gracia, Juan; Goetz, Kimberly; Goto, Yusuke; Guinet, Christophe; Hammill, Mike; Hays, Graeme C.; Hazen, Elliott L.; Huckstadt, Luis A.; Huveneers, Charlie; Iverson, Sara; Jaaman, Saifullah Arifin; Kittiwattanawong, Kongkiat; Kovacs, Kit M.; Lydersen, Christian; Moltmann, Tim; Naruoka, Masaru; Phillips, Lachlan; Picard, Baptiste; Queiroz, Nuno; Reverdin, Gilles; Sato, Katsufumi; Sims, David W.; Thorstad, Eva B.; Thums, Michele; Treasure, Anne; Trites, Andrew W.; Williams, Guy D.; Yonehara, Yoshinari; Fedak, Mike A. (Frontiers Media, 2019-06)
    Animal telemetry is a powerful tool for observing marine animals and the physical environments that they inhabit, from coastal and continental shelf ecosystems to polar seas and open oceans. Satellite-linked biologgers ...
  • Reisinger, Ryan Rudolf; De Bruyn, P.J. Nico; Pistorius, Pierre Anton; Bester, Marthan Nieuwoudt (Springer, 2010-04)
    We report two observations of adult male Antarctic fur seals, Arctocephalus gazella, preying on large octopods at subAntarctic Marion Island during July and August 2008. If Antarctic fur seals take cephalopods ...
  • Travers, Toby; Van den Hoff, John; Lea, Mary-Anne; Carlyon, Kris; Reisinger, Ryan; De Bruyn, P.J. Nico; Morrice, Margie (Springer, 2018-11)
    Occurrences of killer whales (Orcinus orca) in the waters surrounding Sub-Antarctic Macquarie Island have been recorded since the 1820s; however, their presence only became the focus of scientific research in the mid-1990s. ...
  • Wege, Mia; Tosh, Cheryl A.; De Bruyn, P.J. Nico; Bester, Marthan Nieuwoudt (Inter-Research, 2016-07)
    Marine top-predators show fidelity to foraging areas with predictable high-quality food patches. Areas of predictable prey yield are of conservation importance and telemetry data aid in identifying such areas. This study ...
  • Oosthuizen, W.C. (Wessel Christiaan); Bester, Marthan Nieuwoudt; Altwegg, Res; McIntyre, Trevor; De Bruyn, P.J. Nico (Ecological Society of America, 2015-08)
    Predator populations are likely to respond to bottom-up processes, but there remains limited understanding of how wide-ranging marine predators respond to environmentally driven temporal variation in food availability.Widespread ...
  • McIntyre, Trevor; Bornemann, Horst; De Bruyn, P.J. Nico; Reisinger, Ryan Rudolf; Steinhage, Daniel; Marquez, Maria E.I.; Bester, Marthan Nieuwoudt; Plotz, Joachim (Co-Action Publishing, 2014)
    Understanding the distribution and foraging ecology of major consumers within pelagic systems, specifically in relation to physical parameters, can be important for the management of bentho-pelagic systems undergoing ...
  • Lubcker, Nico; Whiteman, John P.; Millar, Robert P.; De Bruyn, P.J. Nico; Newsome, Seth D. (Springer, 2020-05)
    Changes in the nutritional status of free-ranging animals have a strong influence on individual fitness, yet it remains challenging to monitor longitudinally. Nitrogen (δ15N) and carbon (δ13C) isotope values measured ...
  • Wege, Mia; Postma, Martin; Tosh, Cheryl A.; De Bruyn, P.J. Nico; Bester, Marthan Nieuwoudt (Springer, 2015-04)
    A leucistic Antarctic fur seal (Arctocephalus gazella) pup was born on subantarctic Marion Island during the austral summer of 2010/2011. This is the first confirmed record of a leucistic fur seal pup born outside ...
  • Havemann, C.P. (Carl Peter); Retief, Tarryn Anne; Collins, Kirsten; Fynn, R.W.S.; De Bruyn, P.J. Nico (Wiley, 2014-12)
    No abstract available.
  • Oosthuizen, W.C. (Wessel Christiaan); De Bruyn, P.J. Nico; Wege, Mia; Bester, Marthan Nieuwoudt (Oxford University Press, 2016-04)
    Marine predator populations are sensitive to temporal variation in prey availability, but prey dynamics are often difficult to quantify. Long-term measures of offspring growth is a useful performance attribute to gauge the ...
  • Hoffman, J.I.; Bauer, E.; Paijmans, A.J.; Humble, E.; Beckmann, L.M.; Kubetschek, C.; Christaller, F.; Krocker, N.; Fuchs, B.; Moreras, A.; Shihlomule, Y.D.; Bester, Marthan Nieuwoudt; Cleary, A.C.; De Bruyn, P.J. Nico; Forcada, J.; Goebel, M.E.; Goldsworthy, S.D.; Guinet, C.; Hoelzel, A.R.; Lydersen, C.; Kovacs, K.M.; Lowther, A. (Royal Society Publishing, 2018-10)
    Evaluating how populations are connected by migration is important for understanding species resilience because gene flow can facilitate recovery from demographic declines. We therefore investigated the extent to which ...
  • Reisinger, Ryan R.; Raymond, Ben; Hindell, Mark A.; Bester, Marthan Nieuwoudt; Crawford, Robert J.M.; Davies, Delia; De Bruyn, P.J. Nico; Dilley, Ben J.; Kirkman, Stephen P.; Makhado, Azwianewi B.; Ryan, Peter G.; Schoombie, Stefan; Stevens, Kim; Sumner, Michael D.; Tosh, Cheryl A.; Wege, Mia; Whitehead, Thomas Otto; Wotherspoon, Simon; Pistorius, Pierre A. (Wiley, 2018-04)
    AIM : The distribution of marine predators is driven by the distribution and abundance of their prey; areas preferred by multiple marine predator species should therefore indicate areas of ecological significance. The ...
  • Marchal, Antoine F.J.; Lejeune, Philippe; De Bruyn, P.J. Nico (Southern African Wildlife Management Association, 2017-10)
    Estimating the distribution and status of animal populations is crucial in various fields of biology. Monitoring species via their tracks is controversial due to unreliable recording techniques, manipulator bias and ...
  • Tosh, Cheryl A.; De Bruyn, P.J. Nico; Steyn, Jumari; Bornemann, Horst; Van der Hoff, John; Stewart, Brent S.; Plotz, Joachim; Bester, Marthan Nieuwoudt (Springer, 2015-10)
    A novel classification system was applied to the sea level anomaly (SLA) environment around Marion Island. We classified the SLA seascape into habitat types and calculated percentage of habitat use of ten juvenile ...
  • Oosthuizen, W.C. (Wessel Christiaan); Postma, Martin; Altwegg, Res; Nevoux, Marie; Pradel, Roger; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico (Wiley, 2019-10)
    Recruitment age plays a key role in life‐history evolution. Because individuals allocate limited resources among competing life‐history functions, theory predicts trade‐offs between current reproduction and future growth, ...
  • Postma, Martin; Wege, Mia; Bester, Marthan Nieuwoudt; Van der Merwe, Derek S.; De Bruyn, P.J. Nico (Zoological Society of Southern Africa, 2011-04)
    Opportunistic shore-based sightings of southern right whales Eubalaena australis for Marion Island (46°54'S, 37°45'E) were documented at five different times between 1974 and 2009. Whales were sighted between May and ...
  • De Bruyn, P.J. Nico; Tosh, Cheryl A.; Terauds, Aleks (John Wiley & Sons, Inc., 2013-02)
    Killer whales, Orcinus orca, are top predators occupying key ecological roles in a variety of ecosystems and are one of the most widely distributed mammals on the planet. In consequence, there has been significant interest ...
  • Moura, Andre E.; Janse van Rensburg, Charlene; Pilot, Malgorzata; Tehrani, Arman; Best, Peter B.; Thornton, Meredith; Plön, Stephanie; De Bruyn, P.J. Nico; Worley, Kim C.; Gibbs, Richard A.; Dahlheim, Marilyn E.; Hoelzel, A. Rus (Oxford University Press, 2014-05)
    Ecosystem function and resilience is determined by the interactions and independent contributions of individual species. Apex predators play a disproportionately determinant role through their influence and dependence on ...