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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  • Inshore occurrence of southern right whales (Eubalaena australis) at Subantarctic Marion Island 
    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 ...
  • Inter-population differences in diving behaviour of adult male southern elephant seals (Mirounga leonina) 
    James, B.S. (Bridget); McIntyre, Trevor; Tosh, Cheryl A.; Bornemann, Horst; Plotz, Joachim; Bester, Marthan Nieuwoudt (Springer, 2012-11)
    Access to different environments may lead to inter-population behavioural changes within a species that allow populations to exploit their immediate environments. Elephant seals from Marion Island (MI) and King ...
  • 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 ...
  • Local extinction imminent for southern elephant seals Mirounga leonina at their northernmost breeding site, Gough Island-South Atlantic Ocean 
    Jones, Christopher W.; Risi, Michelle M.; Bester, Marthan Nieuwoudt (Springer, 2020-07)
    The continued decline in the small breeding population of southern elephant seals Mirounga leonina at Gough Island (40°19′S, 9°57′W) over a period of 46 years (1973–2019) signals the likely extirpation of the species at ...
  • Long distance breeding dispersal of a southern elephant seal 
    Reisinger, Ryan Rudolf; Bester, Marthan Nieuwoudt (Springer, 2010-05)
    Southern elephant seals range extensively during regular foraging excursions. Despite this they are highly philopatric and long range dispersal is rare. At Gough Island, southern Atlantic Ocean, we observed a breeding adult ...
  • Longitudinal radiographic study of cranial bone growth in young cheetah 
    Steenkamp, Gerhardus; Schmidt, Martin J.; Van Staden, Paul Jacobus; Bester, Marthan Nieuwoudt (Frontiers Media, 2019-07-30)
    Focal palatitis (also known as focal palatine erosion) is thought to be a developmental disease, specifically of cheetah in captivity raised on a commercial diet. The lack of chewing is thought to cause the mandibular ...
  • Making use of multiple surveys : estimating breeding probability using a multievent‐robust design capture–recapture model 
    Oosthuizen, Wessel Christiaan; Pradel, Roger; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico (Wiley Open Access, 2019-01)
    Increased environmental stochasticity due to climate change will intensify temporal variance in the life‐history traits, and especially breeding probabilities, of long‐lived iteroparous species. These changes may decrease ...
  • Managing for change : using vertebrate at sea habitat use to direct management efforts 
    Arthur, Benjamin; Hindell, Mark; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico; Goebel, Michael E.; Trathan, Phil; Lea, Mary-Anne (Elsevier, 2018-08)
    To understand and predict current and future distributions of animals under a changing climate it is essential to establish historical ranges as baselines against which distribution shifts can be assessed. Management ...
  • Marine habitats of juvenile southern elephant seals from Marion Island 
    Tosh, Cheryl A.; Steyn, Jumari; Bornemann, Horst; Van den Hoff, John; Stewart, Brent S.; Plotz, Joachim; Bester, Marthan Nieuwoudt (Inter-Research, 2012-10-23)
    Marine mammals forage in dynamic environments characterized by variables that are continuously changing in relation to large-scale oceanographic processes. In the present study, behavioural states of satellite-tagged ...
  • Marine hotspots of activity inform protection of a threatened community of pelagic species in a large oceanic jurisdiction 
    Requena, Susana; Oppel, Steffen; Bond, Alexander L.; Hall, Jonathan; Cleeland, Jaimie; Crawford, Robert J.M.; Davies, Delia; Dilley, Ben J.; Glass, Trevor; Makhado, Azwianewi; Ratcliffe, Norman; Reid, Timothy A.; Ronconi, Robert A.; Schofield, Andy; Steinfurth, Antje; Wege, Mia; Bester, Marthan Nieuwoudt; Ryan, Peter G. (Wiley, 2020-10)
    Remote oceanic islands harbour unique biodiversity, especially of species that rely on the marine trophic resources around their breeding islands. Identifying marine areas used by such species is essential to manage and ...
  • Marine Mammal Programme at the Prince Edward Islands : 38 years of research 
    Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico; Oosthuizen, Wessel Christiaan; Tosh, Cheryl A.; McIntyre, Trevor; Reisinger, Ryan Rudolf; Postma, Martin; Van der Merwe, Derek S.; Wege, Mia (Taylor & Francis, 2011)
    The Marine Mammal Programme (MMP) conducts research on pinnipeds and killer whales Orcinus orca at Marion Island, Prince Edward Islands, under the auspices of the Mammal Research Institute, Department of Zoology and ...
  • Marine mammals exploring the oceans pole to pole 
    Treasure, Anne; Roquet, Fabien; Ansorge, Isabelle J.; Bester, Marthan Nieuwoudt; Boehme, Lars; Bornemann, Horst; Charrassin, Jean-Benoit; Chevallier, Damien; Costa, Daniel P.; Fedak, Mike A.; Guinet, Christophe; Hammill, Mike O.; Harcourt, Robert G.; Hindell, Mark A.; Kovacs, Kit M.; Lea, Mary-Anne; Lovell, Phil; Lowther, Andrew D.; Lydersen, Christian; McIntyre, Trevor; McMahon, Clive Reginald; Muelbert, Monica M.C.; Nicholls, Keith; Picard, Baptiste; Reverdin, Gilles; Trites, Andrew W.; Williams, Guy D.; De Bruyn, P.J. Nico (Oceanography Society, 2017)
    Polar oceans are poorly monitored despite the important role they play in regulating Earth’s climate system. Marine mammals equipped with biologging devices are now being used to fill the data gaps in these logistically ...
  • Median pupping date, pup mortality and sex ratio of fur seals at Marion Island 
    Hofmeyr, Gordon John Gregory; Bester, Marthan Nieuwoudt; Pistorius, Pierre Anton; Mulaudzi, Tambudzani W.; De Bruyn, P.J. Nico; Ramunasi, Justice A.; Tshithabane, Hendrik N.; McIntyre, Trevor; Radzilani, Phathu M. (Southern African Wildlife Management Association, 2007)
    Modelling fur seal populations requires the accurate assessment of demographic parameters such as age-specific mortality. Owing to the highly variable mortality rates that pups are subject to, mortality of this age class ...
  • Microanatomy and histology of bone pathologies of extant and extinct phocid seals 
    Woolley, Megan R.; Chinsamy, Anusuya; Govender, Romala; Bester, Marthan Nieuwoudt (Taylor and Francis, 2021-08)
    This study investigates three presumed fractured phocid seal bones: An isolated metapodial and an ulna belonging to different individuals of the extinct phocid, Homiphoca capensis, from Langebaanweg and a mandible of a ...
  • Multiple occurrences of king penguin (Aptenodytes patagonicus) sexual harassment by Antarctic fur seals (Arctocephalus gazella) 
    Haddad, William A.; Reisinger, Ryan Rudolf; Scott, Tristan; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico (Springer, 2015-05)
    Sexual coercion is the use of force to achieve mating, while reproductive interference encompasses many forms of interspecific interactions during mating. We describe three new occurrences of the sexual coercion of king ...
  • The nightlife of a Ross seal : diving and haul-out behaviour from the eastern Weddell Sea 
    Wege, Mia; Bornemann, Horst; Bester, Marthan Nieuwoudt (Cambridge University Press, 2023-02)
    Ross seals (Ommatophoca rossii) travel away from the pack ice and spend most of their year foraging pelagically. Here, we augment the few existing records of Ross seal diving and haul-out behaviour, providing novel insights ...
  • Oedipus complex in an Antarctic fur seal pup? 
    Wege, Mia; Bester, Marthan Nieuwoudt; Van der Merwe, Derek S.; Postma, Martin (Springer, 2011-09)
    We present the first evidence of a possible case of the Oedipus complex in a nonprimate. An Antarctic fur seal pup, Arctocephalus gazella, unsuccessfully directed what appeared to be copulatory behaviour towards its own ...
  • The ontogeny of at-sea behaviour in male southern elephant seals (Mirounga leonina) at Marion Island 
    Lasch, Kiara G.; Tosh, Cheryl A.; Bester, Marthan N.; De Bruyn, P.J. Nico (2023-11-22, 2023-01)
    Megafauna, such as southern elephant seals (SESs) (Mirounga leonina, Linn.), forage in diverse, seemingly limitless habitats. In pelagic settings, their behaviour is more likely to be limited by physiological ability and ...
  • Opportunistic ship-based census of pack ice seals in eastern Weddell Sea, Antarctica 
    Bester, Marthan Nieuwoudt; Wege, Mia; Lubcker, Nico; Postma, Martin; Syndercombe, Gavin (Springer, 2019-01)
    The distribution, density and percentage contribution of pack ice pinnipeds during ship-board censuses in the eastern Weddell Sea in summer 2015/2016 are presented. Of the four true pack ice seal species encountered, ...
  • Oral, maxillofacial and dental diseases in captive cheetahs (Acinonyx jubatus) 
    Steenkamp, Gerhardus; Boy, S.C.; Van Staden, Paul Jacobus; Bester, Marthan Nieuwoudt (Elsevier, 2018-01)
    Descriptions of several oral, maxillofacial and dental conditions/diseases exist for a variety of captive large felids, but little is reported on the pathology of free roaming large felids. Apart from focal palatine erosions ...