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Browsing by Author "Underhill, Les G"

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Birds and people: studies based on citizen science and census data of Greater Gauteng, South Africa

Author: Wala, Zingfa Jantur Date: 2018 Global human population growth has been predicted to grow exponentially, to a point where it exceeds the capacity of available resources to sustain it. The consequences that such exponential increase will have on the environment has also been ... Read more
Drivers of bird species richness within moist high-altitude grasslands in eastern South Africa

Author: Maphisa, David H ; Smit-Robinson, Hanneline ; Underhill, Les G ; Altwegg, Res Date: 2016 Moist high-altitude grasslands in South Africa are renowned for high avifaunal diversity and are priority areas for conservation. Conservation management of these areas conflicts with management for other uses, such as intensive livestock ... 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
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
A Knowledge-based approach to wildlife management

Author: Paterson, Barbara ; Brown, Chris J ; Stuart-Hill, Greg ; Winschiers, Heike ; Underhill, Les G ; Dunne, Tim T ; Schinzel, Britta ; Beytell, Ben ; Demas, Fanuel ; Lindeque, Pauline ; Weaver, Chris Date: 2008 We present a method for developing a knowledge base to give wildlife managers timely access to pertinent information. This knowledge-based approach to species management in Namibia focuses on anthologies and management strategies for high-value ... Read more
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
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
S24-1 Progress with the statistical analysis of primary molt

Author: Underhill, Les G ; Serra, Lorenzo ; Brandão, Anabela Date: 2006 This paper considers two extensions to the statistical analysis of primary molt. The first extension relates to the development of statistical models that allow the simultaneous estimation of molt parameters for diverse groups of birds. Parameter ... Read more c b n d
The efficacy of culling seals seen preying on seabirds as a means of reducing seabird mortality

Author: Makhado, Azwianewi B ; Meÿer, Mike A ; Crawford, Robert J M ; Underhill, Les G ; Wilke, Chris Date: 2009 In the 2006/2007 breeding season of Cape gannets Morus capensis at Malgas Island, the removal of 61 Cape fur seals Arctocephalus pusillus pusillus that preyed on gannet fledglings when they left to sea significantly reduced the mortality rate ... Read more
Woody cover and birds

Author: Loftie-Eaton, Megan Date: 2018 Major influences on biodiversity in general and on species distributions in particular have occurred on South African landscapes over time as a result of human activities and climate change. Landscapes in southern Africa are not only a product ... Read more