Browsing Research Articles (Mammal Research Institute) by UP Author "Bester, Marthan Nieuwoudt"

Browsing Research Articles (Mammal Research Institute) by UP Author "Bester, Marthan Nieuwoudt"

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  • Environmental influences on the at-sea behaviour of a major consumer, Mirounga leonina, in a rapidly changing environment 
    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 ...
  • Estimates of the Southern Ocean general circulation improved by animal-borne instruments 
    Roquet, Fabien; Wunsch, Carl; Forget, Gael; Heimbach, Patrick; Guinet, Christophe; Reverdin, Gilles; Charrassin, Jean-Benoit; Bailleul, Frederic; Costa, Daniel P.; Huckstadt, Luis A.; Goetz, Kimberly T.; Kovacs, Kit M., 1956-; Lydersen, Christian; Biuw, Martin; Nøst, Ole A.; Bornemann, Horst; Ploetz, Joachim; Bester, Marthan Nieuwoudt; McIntyre, Trevor; Muelbert, Monica M.C.; Hindell, Mark A.; McMahon, Clive Reginald; Williams, Guy; Harcourt, Robert; Field, Iain C.; Chafik, Leon; Nicholls, Keith W.; Boehme, Lars; Fedak, Mike A. (American Geophysical Union, 2013)
    Over the last decade, several hundred seals have been equipped with conductivity-temperature-depth sensors in the Southern Ocean for both biological and physical oceanographic studies. A calibrated collection of ...
  • Estimating exposed pulp lengths of tusks in the African elephant (Loxodonta africana africana) 
    Steenkamp, Gerhardus; Ferguson, Jan Willem Helenus; Boy, Sonja Catharina; Ferreira, Sam M.; Bester, Marthan Nieuwoudt (South African Veterinary Association, 2008-03)
    Captive and wild African elephants frequently suffer tusk fractures. Several institutions shorten the tusks of captive elephants to reduce fractures and injury as a result of behaviour within enclosures. Fracturing or ...
  • Fine scale movements and activity areas of white sharks (Carcharodon carcharias) in Mossel Bay, South Africa 
    Jewell, Oliver Joseph David; Johnson, Ryan Lloyd; Gennari, Enrico; Bester, Marthan Nieuwoudt (Springer, 2013-07)
    Previous work on white sharks indicate the species show seasonally limited movement patters, at certain aggregation sites small areas may play vital roles in the life history of a large amount of the population. Acoustic ...
  • First confirmed record of a leucistic Antarctic fur seal pup born outside the Scotia Arc Islands 
    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 ...
  • First record of a leucistic sub-Antarctic fur seal 
    Jones, Christopher W.; Risi, Michelle M.; Osborne, Alexis; Bester, Marthan Nieuwoudt (Springer, 2019-06)
    Anomalous pelage colourations have been reported to occur in several pinniped species and can potentially be used to assess gene flow amongst conspecific populations. Aberrant pelage colour has not been documented in ...
  • Fish prey of sub-Antarctic fur seals Arctocephalus tropicalis at the Tristan da Cunha Islands, South Atlantic Ocean 
    Bester, Marthan Nieuwoudt; Stansfield, L.J.; Glass, Trevor; De Bruyn, P.J. Nico (Springer, 2021-05)
    Some top predator populations in the South Atlantic and South Indian oceans are in decline, presumably contingent upon reduced food availability, precipitated by climate change. This phenomenon impacts on the positions of ...
  • Focal palatitis (previously focal palatine erosions) in captive cheetahs (Acinonyx jubatus) 
    Steenkamp, Gerhardus; Boy, Sonja C.; Van Staden, Paul Jacobus; Bester, Marthan Nieuwoudt (Frontiers Media, 2021-07-12)
    Focal palatine erosion (FPE) is a misleading term that is used in the literature to describe inflammatory lesions associated with depressions of the palatal mucosa in cheetah. Cheetahs have large cheek teeth and these ...
  • Foraging behaviour of Weddell seals (Leptonychotes weddellii) in connection to oceanographic conditions in the southern Weddell Sea 
    Nachtsheim, Dominik A.; Ryan, Svenja; Schroder, Michael; Jensen, Laura; Oosthuizen, Wessel Christiaan; Bester, Marthan Nieuwoudt; Hagen, Wilhelm; Bornemann, Horst (Elsevier, 2019-04)
    The region of the Filchner Outflow System (FOS) in the southeastern Weddell Sea is characterized by intensive and complex interactions of different water masses. Dense Ice Shelf Water (ISW) emerging from beneath the ice ...
  • Fur seals do, but sea lions don't — cross taxa insights into exhalation during ascent from dives 
    Hooker, Sascha K.; Andrews, Russel D.; Arnould, John P.Y.; Bester, Marthan Nieuwoudt; Davis, Randall W.; Insley, Stephen J.; Gales, Nick J.; Goldsworthy, Simon D.; McKnight, J. Chris (Royal Society, 2021-08)
    Management of gases during diving is not well understood across marine mammal species. Prior to diving, phocid (true) seals generally exhale, a behaviour thought to assist with the prevention of decompression sickness. ...
  • The genetic legacy of extreme exploitation in a polar vertebrate 
    Paijmans, Anneke J.; Stoffel, Martin A.; Bester, Marthan Nieuwoudt; Cleary, Alison C .; De Bruyn, P.J. Nico; Forcada, Jaume; Goebel, Michael E .; Goldsworthy, Simon D.; Guinet, Christophe; Lydersen, Christian; Kovacs, Kit M.; Lowther, Andrew; Hoffman, Joseph I. (Nature Publishing Group, 2020-03-20)
    Understanding the effects of human exploitation on the genetic composition of wild populations is important for predicting species persistence and adaptive potential. We therefore investigated the genetic legacy of ...
  • Geographic variation in subantarctic fur seal pup growth : linkages with environmental variability and population density 
    Oosthuizen, 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 ...
  • A global cline in a colour polymorphism suggests a limited contribution of gene flow towards the recovery of a heavily exploited marine mammal 
    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 ...
  • Goose barnacles hitchhike on satellite-tracked southern elephant seals 
    Reisinger, Ryan Rudolf; McIntyre, Trevor; Bester, Marthan Nieuwoudt (Springer, 2009-09)
    Goose barnacles (Lepas australis) attached to satellite-relay data loggers were carried by three southern elephant seals (Mirounga leonina) from Marion Island. Their movements across the Polar Frontal Zone are presented, ...
  • Goose barnacles on seals and a penguin at Gough Island 
    Reisinger, Ryan Rudolf; Bester, Marthan Nieuwoudt (Zoological Society of Southern Africa, 2010-04)
    During a survey of seals in September and October 2009 at Gough Island, South Atlantic Ocean, we recorded goose barnacles (Lepas australis) attached to the pelage of two of the 12 elephant seals (Mirounga leonina) inspected ...
  • Habitat modelling of tracking data from multiple marine predators identifies important areas in the Southern Indian Ocean 
    Reisinger, Ryan Rudolf; 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 Anton (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 ...
  • Hitchhiking goose barnacles and their potential implications on the functioning of animal-borne instruments 
    McIntyre, Trevor; Postma, Martin; Van der Merwe, Derek S.; Wege, Mia; Bester, Marthan Nieuwoudt (Southern African Wildlife Management Association, 2011-10)
    Goose barnacles (Lepas australis) were found attached to satellite-tracking and time-depth recording (TDR) instruments carried by two lactating Subantarctic fur seals (Arctocephalus tropicalis) from Marion Island. We ...
  • The importance of seasonal sea surface height anomalies for foraging juvenile southern elephant seals 
    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 ...
  • Increase of sub-Antarctic fur seals at the Tristan da Cunha Islands 
    Bester, Marthan Nieuwoudt; Wege, Mia; Glass, T. (Springer, 2019-01)
    Sub-Antarctic fur seal, Arctocephalus tropicalis, pups were counted on some of the beaches on all four Tristan da Cunha (TdC) islands, in January 2017, to determine the status of the population, in the face of climate ...
  • Individual heterogeneity in life-history trade-offs with age at first reproduction in capital breeding elephant seals 
    Oosthuizen, 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, ...