James, B.S. (Bridget); Bester, Marthan Nieuwoudt; Penry, G.S. (Gwenith); Gennari, Enrico; Elwen, Simon Harvey(Taylor and Francis, 2015-10)
Indian Ocean humpback dolphins Sousa plumbea inhabit nearshore waters from South Africa to eastern India. Humpback dolphins are vulnerable to conservation threats due to their naturally small population sizes and use of ...
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, ...
Delaney, David G.; Johnson, Ryan Lloyd; Bester, Marthan Nieuwoudt; Gennari, Enrico; Stow, Adam(Public Library of Science, 2012-04-13)
Determining the residency of an aquatic species is important but challenging and it remains unclear what is the best
sampling methodology. Photo-identification has been used extensively to estimate patterns of animals’ ...
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 ...
Cook, Timothee R.; Jewell, Oliver Joseph David; Chivell, Wilfred; Bester, Marthan Nieuwoudt(Seabird Group, 2012-03-11)
Albinism has been recorded in many vertebrate taxa (Halls 2004). It
is a genetic anomaly in which an autosomal recessive gene causes an
absence of the enzyme tyrosinase, resulting in a total lack of melanin
pigment in ...
Under high light intensity, phytoplankton protect
their photosystems from bleaching through nonphotochemical
quenching processes. The consequence of
this is suppression of fluorescence emission, which must
be corrected ...
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 ...
We studied the diet of Cape clawless otters (Aonyx capensis) at three sites along the eastern
and southern coast of South Africa to assess possible spatial variation along a community
species richness and biomass gradient ...
White sharks Carcharodon carcharias are highly visual predators, leading to the hypothesis that the predation risk for foraging Cape fur seals Arctocephalus pusillus pusillus might differ with ambient light conditions. ...
Jewell, Oliver Joseph David; Wcisel, Michelle A.; Towner, Alison V.; Chivell, Wilfred; Van der Merwe, Lize; Bester, Marthan Nieuwoudt(Inter-Research Science, 2014-06)
Manual acoustic telemetry was used to describe core habitat use of white sharks in
the complex marine landscape of the Dyer Island and Geyser Rock system near Gansbaai, South
Africa. We compared home range estimates and ...
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 ...
We describe the habitat use of 22 male southern elephant seals (Mirounga leonina) satellite
tagged at Marion Island between 2004 and 2008. While a few areas of increased utilization appeared to be
associated with areas ...
Scats of subantarctic fur seals Arctocephalus
tropicalis at Marion Island were collected from 1996 to
2,000, to examine temporal variability in the diet, factors
affecting the variability and how the diet differed ...
Bester, Marthan Nieuwoudt; Ryan, Peter G.(Springer, 2019-06)
A sub-Antarctic fur seal, Arctocephalus tropicalis, pup was located on Inaccessible Island in the Tristan da Cunha archipelago (TdC), well before the start of the annual breeding (pupping and mating) season in 2018. It was ...
Jewell, Oliver Joseph David; Wcisel, Michelle A.; Gennari, Enrico; Towner, Alison V.; Bester, Marthan Nieuwoudt; Johnson, Ryan Lloyd; Singh, Sarika(Public Library of Science, 2011-11)
We present 15 individual cases of sub-adult white sharks that were SPOT tagged in South Africa from 2003–2004 and have
been re-sighted as recently as 2011. Our observations suggest SPOT tags can cause permanent cosmetic ...
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 ...
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 ...
Steenkamp, Gerhardus; Ferguson, J. Willem H.; 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 ...
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 ...