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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  • Overlap and temporal variation in the diets of sympatric Antarctic and Subantarctic fur seals (Arctocephalus spp.) at Marion Island, Prince Edward Islands 
    Reisinger, Ryan Rudolf; Landman, Marietjie; Mgibantaka, Nonkoliso; Smale, Malcolm J.; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico; Pistorius, Pierre Anton (Co-Action Publishing, 2018-04-20)
    Antarctic (Arctocephalus gazella) and Subantarctic (A. tropicalis) fur seals are important predators in the Southern Ocean. Marion Island (southern Indian Ocean) hosts the largest sympatric breeding populations of these ...
  • Phenotypic selection and covariation in the life‐history traits of elephant seals : heavier offspring gain a double selective advantage 
    Oosthuizen, Wessel Christiaan; Altwegg, Res; Nevoux, Marie; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico (Wiley, 2018-06)
    Early developmental conditions contribute to individual heterogeneity of both phenotypic traits and fitness components, ultimately affecting population dynamics. Although the demographic consequences of ontogenic growth ...
  • Pinniped entanglement in oceanic plastic pollution : a global review 
    Jepsen, Emma M.; De Bruyn, P.J. Nico (Elsevier, 2019-08)
    Oceanic plastic pollution is a growing worldwide environmental concern, endangering numerous marine species. Pinnipeds are particularly susceptible to entanglement, especially in abandoned, lost or discarded fishing gear ...
  • Population dynamics of southern elephant seals : a synthesis of three decades of demographic research at Marion Island 
    Pistorius, Pierre Anton; De Bruyn, P.J. Nico; Bester, Marthan Nieuwoudt (Taylor & Francis, 2011)
    Southern elephant seal Mirounga leonine numbers declined precipitously throughout most of their circumpolar distribution since the 1950s. A long-term intensive demographic programme was initiated in 1983 on the relatively ...
  • Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift 
    Moura, Andre E.; Kenny, John G.; Chaudhuri, Roy; Hughes, Margaret A.; Welch, Andreanna J.; Reisinger, Ryan Rudolf; De Bruyn, P.J. Nico; Dahlheim, Marilyn E.; Hall, Nathalie; Hoelzel, A. Rus (Wiley, 2014)
    The evolution of diversity in the marine ecosystem is poorly understood, given the relatively high potential for connectivity, especially for highly mobile species such as whales and dolphins. The killer whale (Orcinus ...
  • Positive early-late life-history trait correlations in elephant seals 
    Oosthuizen, Wessel Christiaan; Peron, Guillaume; Pradel, Roger; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico (Ecological Society of America, 2021-04)
    Correlations between early- and late-life performance are a major prediction of life-history theory. Negative early–late correlations can emerge because biological processes are optimized for early but not late life ...
  • 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 ...
  • Predatory impact of killer whales on pinniped and penguin populations at the Subantarctic Prince Edward Islands : fact and fiction 
    Reisinger, Ryan Rudolf; De Bruyn, P.J. Nico; Bester, Marthan Nieuwoudt (Wiley-Blackwell, 2011-09)
    Killer whales are the oceans’ apex predators and their potential effects on ecosystems have been demonstrated. In the Southern Ocean the role of killer whale predation in population declines of southern elephant seals ...
  • Preferred, small‑scale foraging areas of two Southern Ocean fur seal species are not determined by habitat characteristics 
    Wege, Mia; De Bruyn, P.J. Nico; Hindell, Mark A.; Lea, Mary‑Anne; Bester, Marthan Nieuwoudt (BioMed Central, 2019-09-11)
    BACKGROUND : To understand and predict the distribution of foragers, it is crucial to identify the factors that affect individual movement decisions at different scales. Individuals are expected to adjust their foraging ...
  • Prevalence of allosuckling behaviour in Subantarctic fur seal pups 
    De Bruyn, P.J. Nico; Cameron, Elissa Z.; Tosh, Cheryl A.; Oosthuizen, Wessel Christiaan; Reisinger, Ryan Rudolf; Mufanadzo, N. Thomas; Phalanndwa, Mashudu V.; Postma, Martin; Wege, Mia; Van der Merwe, Derek S.; Bester, Marthan Nieuwoudt (Elsevier, 2010-01)
    Non-offspring maternal care should be rare due to the high costs of raising offspring, particularly lactation, but nonetheless occurs in a variety of taxa. Misguided parental care, associated with recognition errors and/or ...
  • Prey and seasonal abundance of killer whales at sub-Antartic Marion Island 
    Reisinger, Ryan Rudolf; De Bruyn, P.J. Nico; Tosh, Cheryl A.; Oosthuizen, Wessel Christiaan; Mufanadzo, N. Thomas; Bester, Marthan Nieuwoudt (Taylor & Francis, 2011)
    The diet of killer whales Orcinus orca was investigated from 48 predation events observed during 823 sightings at sub-Antarctic Marion Island between 2006 and 2009. From these events, there were 10 cases where prey could ...
  • Reliability of VHF telemetry data for measuring attendance patterns of marine predators : a comparison with time depth recorder data 
    Lowther, Andrew D.; Ahonen, Heidi; Hofmeyr, Greg; Oosthuizen, Wessel Christiaan; De Bruyn, P.J. Nico; Lydersen, Christian; Kovacs, Kit M.; Corkeron, Peter (Inter-Research, 2015-10-28)
    Very high frequency (VHF) radiotelemetry data has been used for over 30 yr to monitor the behavior patterns of otariid seals. These data have been used in a wide variety of ways, from characterizing the reproductive and ...
  • The retrospective analysis of Antarctic tracking data project 
    Ropert-Coudert, Yan; Van de Putte, Anton P.; Reisinger, Ryan R.; Bornemann, Horst; Charrassin, Jean-Benoit; Costa, Daniel P.; Danis, Bruno; Huckstadt, Luis A .; Huckstadt, Luis A.; Jonsen, Ian D.; Lea, Mary-Anne; Thompson, David; Torres, Leigh G.; Trathan, Philip N.; Wotherspoon, Simon; Ainley, David G.; Alderman, Rachael; Andrews-Goff, Virginia; Arthur, Ben; Ballard, Grant; Bengtson, John; Bester, Marthan Nieuwoudt; Blix, Arnoldus Schytte; Boehme, Lars; Bost, Charles-Andre; Boveng, Peter; Cleeland, Jaimie; Constantine, Rochelle; Crawford, Robert J.M.; Rosa, Luciano Dalla; De Bruyn, P.J. Nico; Delord, Karine; Descamps, Sebastien; Double, Mike; Emmerson, Louise; Fedak, Mike; Friedlaender, Ari; Gales, Nick; Goebel, Mike; Goetz, Kimberly T.; Guinet, Christophe; Goldsworthy, Simon D.; Harcourt, Rob; Hinke, Jefferson T.; Jerosch, Kerstin; Kato, Akiko; Kerry, Knowles R.; Kirkwood, Roger; Kooyman, Gerald L.; Kovacs, Kit M.; Lawton, Kieran; Lowther, Andrew D.; Lydersen, Christian; Lyver, Phil O’B.; Makhado, Azwianewi B.; Marquez, Maria E. I.; McDonald, Birgitte I.; McMahon, Clive Reginald; Muelbert, Monica; Nachtsheim, Dominik; Nicholls, Keith W.; Nordoy, Erling S.; Olmastroni, Silvia; Phillips, Richard A.; Pistorius, Pierre Anton; Plotz, Joachim; Putz, Klemens; Ratcliffe, Norman; Ryan, Peter G.; Santos, Mercedes; Southwell, Colin; Staniland, Iain; Takahashi, Akinori; Tarroux, Arnaud; Trivelpiece, Wayne; Wakefield, Ewan; Weimerskirch, Henri; Wienecke, Barbara; Xavier, Jose C.; Raymond, Ben; Hindell, Mark A . (Nature Publishing Group, 2020-03-18)
    The Retrospective Analysis of Antarctic Tracking Data (RAATD) is a Scientific Committee for Antarctic Research project led jointly by the Expert Groups on Birds and Marine Mammals and Antarctic Biodiversity Informatics, ...
  • Satellite tagging and biopsy sampling of killer whales at Subantarctic Marion Island : effectiveness, immediate reactions and long-term responses 
    Reisinger, Ryan Rudolf; Oosthuizen, Wessel Christiaan; Peron, Guillaume; Toussaint, Dawn Cory; Andrews, Russel D.; De Bruyn, P.J. Nico (Public Library of Science, 2014-11)
    Remote tissue biopsy sampling and satellite tagging are becoming widely used in large marine vertebrate studies because they allow the collection of a diverse suite of otherwise difficult-to-obtain data which are critical ...
  • Seasonal fission and fusion of killer whale, Orcinus orca, social structure at sub-Antarctic Marion Island 
    Jordaan, Rowan Keith; Reisinger, Ryan Rudolf; Oosthuizen, Wessel Christiaan; De Bruyn, P.J. Nico (Elsevier, 2021-07)
    Variation in the distribution and abundance of food resources are key factors affecting animal sociality. In environments with variable resources, dynamic social organization, such as the fission and fusion of groups, is ...
  • Sex at sea : alternative mating system in an extremely polygynous mammal 
    De Bruyn, P.J. Nico; Tosh, Cheryl A.; Bester, Marthan Nieuwoudt; Cameron, Elissa Z.; McIntyre, Trevor; Wilkinson, I.S. (Ian Stewart) (Elsevier, 2011-09)
    Polygyny is a widespread and evolutionarily significant mating system in vertebrates. The southern elephant seal, Mirounga leonina, has often been cited as an example of an animal with an extremely polygynous mating ...
  • Simplifying photogrammetric analysis for assessment of large mammal mass : automated targeting and 3D model building 
    Bester, L. Catherine; De Bruyn, P.J. Nico (Wiley, 2015-06)
    Close range photogrammetry has increasingly diverse practical application within the biological sciences. Its use in large mammal research for size and/or mass estimation has proven extremely beneficial. Recent photogrammetric ...
  • South African research in the Southern Ocean : new opportunities but serious challenges 
    Treasure, Anne M.; Moloney, Coleen L.; Bester, Marthan Nieuwoudt; McQuaid, Christopher D.; Findlay, Kenneth Pierce; Best, Peter B.; Cowan, Don A.; De Bruyn, P.J. Nico; Dorrington, Rosemary A.; Fagereng, Ake; Froneman, P. William; Grantham, Geoff H.; Hunt, Brian P. V.; Meiklejohn, K.I. (Ian); Pakhomov, Evgeny A.; Roychoudhury, Alakendra N.; Ryan, Peter G.; Smith, Valdon R.; Chown, Steven Loudon; Ansorge, Isabelle J. (AOSIS Open Journals, 2013-03)
    South Africa has a long track record in Southern Ocean and Antarctic research and has recently invested considerable funds in acquiring new infrastructure for ongoing support of this research. This infrastructure includes ...
  • Spatial variation in female southern elephant seal mass change assessed by an accurate non-invasive photogrammetry method 
    Postma, Martin; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico (Cambridge University Press, 2013-12)
    Physically weighing large marine mammals sequentially over time has presented researchers with a logistical challenge and has severely limited sample sizes. Using a well-established photogrammetry method we developed a ...
  • Temporary marking of unweaned southern elephant seal (Mirounga leonina L.) pups 
    De Bruyn, P.J. Nico; Tosh, Cheryl A.; Oosthuizen, Wessel Christiaan; Phalanndwa, Mashudu V.; Bester, Marthan Nieuwoudt (Southern African Wildlife Management Association, 2008-10)
    Like many pinniped species, southern elephant seals (Mirounga leonina) are conducive to long-term population studies using mark-recapture techniques. The twenty-four year longitudinal dataset at sub-Antarctic Marion Island ...