Browsing Journal Articles by Department "Animal Demography Unit (ADU)"

Now showing items 1-12 of 12

Accuracy of ARGOS locations of pinnipeds at-sea estimated using Fastloc GPS

Author: Costa, Daniel P ; Robinson, Patrick W ; Arnould, John P Y ; Harrison, Autumn-Lynn ; Simmons, Samantha E ; Hassrick, Jason L ; Hoskins, Andrew J ; Kirkman, Stephen P ; Oosthuizen, Herman ; Villegas-Amtmann, Stella Date: 2010 BACKGROUND: ARGOS satellite telemetry is one of the most widely used methods to track the movements of free-ranging marine and terrestrial animals and is fundamental to studies of foraging ecology, migratory behavior and habitat-use. ARGOS ... Read more c b
Effects of smart position only (SPOT) tag deployment on white sharks Carcharodon carcharias in South Africa

Author: Jewell, Oliver J D ; Wcisel, Michelle A ; Gennari, Enrico ; Towner, Alison V ; Bester, Marthán N ; Johnson, Ryan L ; Singh, Sarika Date: 2011 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 and structural damage ... Read more c b
Environmental influences on the abundance and sexual composition of white sharks Carcharodon carcharias in Gansbaai, South Africa

Author: Towner, Alison V ; Underhill, Les G ; Jewell, Oliver J D ; Smale, Malcolm J Date: 2013 The seasonal occurrence of white sharks visiting Gansbaai, South Africa was investigated from 2007 to 2011 using sightings from white shark cage diving boats. Generalized linear models were used to investigate the number of great white sharks ... Read more c b
Evaluating the impact of handling and logger attachment on foraging parameters and physiology in southern rockhopper penguins

Author: Ludynia, Katrin ; Dehnhard, Nina ; Poisbleau, Maud ; Demongin, Laurent ; Masello, Juan F ; Quillfeldt, Petra Date: 2012 Logger technology has revolutionised our knowledge of the behaviour and physiology of free-living animals but handling and logger attachments may have negative effects on the behaviour of the animals and their welfare. We studied southern ... Read more c b
Good days, bad days: wind as a driver of foraging success in a flightless seabird, the southern Rockhopper Penguin

Author: Dehnhard, Nina ; Ludynia, Katrin ; Poisbleau, Maud ; Demongin, Laurent ; Quillfeldt, Petra Date: 2013 Due to their restricted foraging range, flightless seabirds are ideal models to study the short-term variability in foraging success in response to environmentally driven food availability. Wind can be a driver of upwelling and food abundance ... Read more c b
Hand-rearing, release and survival of african penguin chicks abandoned before independence by moulting parents

Author: Sherley, Richard B ; Waller, Lauren J ; Strauss, Venessa ; Geldenhuys, Deon ; Underhill, Les G ; Parsons, Nola J Date: 2014 The African penguin Spheniscus demersus has an ‘Endangered’ conservation status and a decreasing population. Following abandonment, 841 African penguin chicks in 2006 and 481 in 2007 were admitted to SANCCOB (Southern African Foundation for ... Read more c b
Overlap in utilization of juvenile Cape Horse Mackerel by Cape Fur Seals and the purse-seine fishery in Namibia

Author: Mecenero, Silvia ; Underhill, Les G ; Krakstad, Jens-Otto ; Kirkman, Stephen P ; Roux, Jean-Paul Date: 2007 The Cape horse mackerel Trachurus trachurus capensisis one of Namibia's most valuable fish stocks, and an important component to the diet of Cape fur seals, Arctocephalus pusillus pusillus, off northern Namibia. The level of overlap in the ... Read more
Phenological changes in the Southern Hemisphere

Author: Chambers, Lynda E ; Altwegg, Res ; Barbraud, Christophe ; Barnard, Phoebe ; Beaumont, Linda J ; Crawford, Robert J M ; Durant, Joel M ; Hughes, Lesley ; Keatley, Marie R ; Low, Matt Date: 2013 Current evidence of phenological responses to recent climate change is substantially biased towards northern hemisphere temperate regions. Given regional differences in climate change, shifts in phenology will not be uniform across the globe, ... Read more c b
Ranging Behaviour of Verreaux's Eagles during the Pre-Breeding Period Determined through the Use of High Temporal Resolution Tracking

Author: Murgatroyd, Megan ; Underhill, Les G ; Bouten, Willem ; Amar, Arjun Date: 2016 Information on movement ecology is key in understanding the drivers and limitations of life history traits and has a potential role in indicating environmental change. Currently we have a limited understanding of the parameters of movement ... Read more c b
Revisiting the effect of capture heterogeneity on survival estimates in capture-mark-recapture studies: does it matter?

Author: Abadi, Fitsum ; Botha, Andre ; Altwegg, Res Date: 2013 Recently developed capture-mark-recapture methods allow us to account for capture heterogeneity among individuals in the form of discrete mixtures and continuous individual random effects. In this article, we used simulations and two case ... Read more c b
Secretarybird Sagittarius serpentarius Population Trends and Ecology: Insights from South African Citizen Science Data

Author: Hofmeyr, Sally D ; Symes, Craig T ; Underhill, Leslie G Date: 09 May 2014 Data from two long-term citizen science projects were used to examine the status and ecology of a Red List species, the Secretarybird Sagittarius serpentarius (Vulnerable), in South Africa. The first phase of the Southern African Bird Atlas ... Read more c b
A space oddity: geographic and specific modulation of migration in Eudyptes penguins

Author: Thiebot, Jean-Baptiste ; Cherel, Yves ; Crawford, Robert J M ; Makhado, Azwianewi B ; Trathan, Philip N ; Pinaud, David ; Bost, Charles-André Date: 2013 Post-breeding migration in land-based marine animals is thought to offset seasonal deterioration in foraging or other important environmental conditions at the breeding site. However the inter-breeding distribution of such animals may reflect ... Read more c b

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Browsing Journal Articles by Department "Animal Demography Unit (ADU)"

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