Browsing Research Articles (Mammal Research Institute) by UP Author "Reisinger, Ryan Rudolf"

Browsing Research Articles (Mammal Research Institute) by UP Author "Reisinger, Ryan Rudolf"

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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, ...
  • 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 ...
  • 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 ...
  • Towner, Alison V.; Wcisel, Michelle A.; Reisinger, Ryan Rudolf; Edwards, David; Jewell, Oliver Joseph David; Danilo, Russo (Public Library of Science, 2013-06-12)
    South Africa is reputed to host the world’s largest remaining population of white sharks, yet no studies have accurately determined a population estimate based on mark-recapture of live individuals. We used dorsal fin ...
  • 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, ...
  • 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 ...
  • 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 ...
  • Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico; Oosthuizen, W.C. (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 ...
  • Reisinger, Ryan Rudolf; Keith, Mark; Andrews, Russel D.; De Bruyn, P.J. Nico (Elsevier, 2015-12)
    Eleven satellite tagswere deployed on 9 killerwhales at the Prince Edwards Islands in the Southern Ocean. Statespace switchingmodelswere used to generate position estimates fromArgos location data,while two behavioural modes ...
  • 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 ...
  • 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 ...
  • Reisinger, Ryan Rudolf; Karczmarski, Leszek (Wiley-Blackwell, 2010-01)
    This study estimates the population size of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in the Algoa Bay region on the Eastern Cape coast of South Africa. Mark-recapture analyses were performed on photo-identification ...
  • 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 ...
  • De Bruyn, P.J. Nico; Cameron, Elissa Z.; Tosh, Cheryl A.; Oosthuizen, W.C. (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 ...
  • Reisinger, Ryan Rudolf; De Bruyn, P.J. Nico; Tosh, Cheryl A.; Oosthuizen, W.C. (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 ...
  • Whitehead, Thomas Otto; Rollinson, Dominic Paul; Reisinger, Ryan Rudolf (Springer, 2015-12)
    Several records describe pseudostalked barnacles Xenobalanus globicipitis attached to killer whales Orcinus orca, yet little is known of this association in Southern African waters. Here we describe Xenobalanus prevalence ...
  • Reisinger, Ryan Rudolf; Oosthuizen, W.C. (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 ...
  • Postma, Martin; Tordiffe, A.S.W. (Adrian Stephen Wolferstan); Hofmeyr, M.S.; Reisinger, Ryan Rudolf; Bester, L. Catherine; Buss, Peter Erik; De Bruyn, P.J. Nico (Ecological Society of America, 2015-12-22)
    Assessing body mass in mammals is of importance as it influences virtually all aspects of mammal physiology, behavior and ecological parameters. However, the assessment of body mass of large mammals is potentially dangerous ...
  • Bornemann, Horst; De Bruyn, P.J. Nico; Reisinger, Ryan Rudolf; Kastner, Sabine; Marquez, Maria E.I.; McIntyre, Trevor; Bester, Marthan Nieuwoudt; Plotz, Joachim (Springer, 2013-11)
    Immobilization and anaesthesia of adult male southern elephant seals (Mirounga leonina) is potentially risky for animals and scientists. A tiletamine/zolazepam injection is considered the most appropriate drug ...
  • Wege, Mia; Etienne, Marie-Pierre; Oosthuizen, W.C. (Wessel Christiaan); Reisinger, Ryan Rudolf; Bester, Marthan Nieuwoudt; De Bruyn, P.J. Nico (Wiley, 2016-07)
    Recent pup population estimates of sympatric Subantarctic (Arctocephalus tropicalis) and Antarctic fur seals (A. gazella) at Marion Island are presented. Published pup population estimates of A. tropicalis (1995 and 2004) ...