Browsing by UP Author "Skinner, J.D. (John Dawson), 1932-"

Browsing by UP Author "Skinner, J.D. (John Dawson), 1932-"

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  • The activity budgets and activity patterns of sympatric grey rhebok and mountain reedbuck in a highveld grassland area of South Africa 
    Taylor, William Andrew; Skinner, J.D. (John Dawson), 1932-; Krecek, R.C. (Blackwell, 2006-11)
    Behavioural observations were carried out on grey rhebok and mountain reedbuck at Sterkfontein Dam Nature Reserve, South Africa, for a period of 1 year between May 2001 and April 2002. Four harem herds of grey rhebok, five ...
  • Akademiese gesindheid, die dierkundige en die belangrikheid van navorsing 
    Skinner, J.D. (John Dawson), 1932-; University of Pretoria. Dept. of Zoology (University of Pretoria, 1986-10-21)
    Disposition is so important because it is the basis on which academic achievement is built and is reflected in the mission of the University. The University of Pretoria regard it as their mission to equip students through ...
  • Allometric analysis of the giraffe cardiovascular system 
    Mitchell, Graham; Skinner, J.D. (John Dawson), 1932- (Elsevier, 2009-12)
    There has been co-evolution of a long neck and high blood pressure in giraffes. How the cardiovascular system (CVS) has adapted to produce a high blood pressure, and how it compares with other similar sized mammals largely ...
  • Can osteophagia provide giraffes with phosphorus and calcium? 
    Bredin, I.P.; Skinner, J.D. (John Dawson), 1932-; Mitchell, Graham (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2008-03)
    The daily requirement for calcium and phosphorus by giraffes to sustain the growth and maintenanceof their skeletons is large. The source of sufficient calcium is browse. The source of necessary phosphorus is obscure, but ...
  • Demography of giraffe deaths in a drought 
    Mitchell, Graham; Van Sittert, Sybrand J.; Skinner, J.D. (John Dawson), 1932- (Royal Society of South Africa, 2010-11)
    Darwin’s theory for the evolution of the long neck of giraffes is that height confers access to browse free of competition from smaller browsers. The theory predicts that survivors of a drought will be the tallest animals ...
  • Growth patterns and masses of the heads and necks of male and female giraffes 
    Mitchell, Graham; Roberts, D.; Van Sittert, Sybrand J.; Skinner, J.D. (John Dawson), 1932- (Wiley-Blackwell, 2013-05)
    We have analyzed the growth patterns of the head and neck of 65 male and 71 female giraffes from two different populations of giraffes, and also the dimensions of 19 different components of the head and neck in 8 female ...
  • Lung volumes in giraffes, Giraffa camelopardalis 
    Mitchell, Graham; Skinner, J.D. (John Dawson), 1932- (Elsevier, 2011-01)
    We have measured lung mass and trachea dimensions in 46 giraffes of both genders ranging in body mass from 147 kg to 1441 kg, calculated static and dynamic lung volumes, and developed allometric equations that relate ...
  • Nematodes of the small intestine of African buffaloes, Syncerus caffer, in the Kruger National Park, South Africa 
    Taylor, William Andrew; Skinner, J.D. (John Dawson), 1932-; Boomker, Jacob Diederik Frederik (AOSIS Open Journals, 2013-05-16)
    The abundance and distribution of parasitic helminths in populations of African buffaloes, Syncerus caffer, have not been well documented. A total of 28 buffaloes of different ages and sexes were sampled in the Kruger ...
  • Orbit orientation and eye morphometrics in giraffes (Giraffa camelopardalis) 
    Mitchell, Graham; Roberts, D.G.; Van Sittert, Sybrand J.; Skinner, J.D. (John Dawson), 1932- (Zoological Society of Southern Africa, 2013-10)
    Giraffe are thought to have excellent vision.We measured eye size, orbit orientation and retina surface area in 27 giraffes of both sexes ranging in age from neonates to mature adults (>10 yrs), to assess how it changes ...
  • Restoring lions Panthera leo to northern KwaZulu-Natal, South Africa : short-term biological and technical success but equivocal long-term conservation 
    Hunter, Luke T.B.; Pretorius, K.; Carlisle, L.C.; Rickelton, M.; Walker, C.; Slotow, Robert; Skinner, J.D. (John Dawson), 1932- (Cambridge University Press, 2007-04)
    The success of efforts to re-establish mammalian carnivores within their former range is dependent on three key factors : methodological considerations, the biological requirements of the target species, and the involvement ...
  • The structure and function of giraffe jugular vein valves 
    Mitchell, Graham; Van Sittert, Sybrand J.; Skinner, J.D. (John Dawson), 1932- (Southern African Wildlife Management Association, 2009-10)
    When a giraffe (Giraffa camelopardalis) lowers its head to drink, blood could enter the jugular vein from the inferior vena cava or regurgitate from the jugular veins into the cranial veins. We investigated the anatomy of ...
  • Territorial behaviour in southern impala rams (Aepyceros melampus Lichtenstein) 
    Oliver, C.M.; Skinner, J.D. (John Dawson), 1932-; Van der Merwe, D. (Blackwell Publishing, 2007-06)
    The role of territoriality was investigated by studying 25 impala rams at a reserve in the Waterberg region of South Africa (23°45'S, 28°23'E). Mean territorial tenure was 67.25 days (range 23–99), with a mean territory ...
  • Variation in tooth mark frequencies on long bones from the assemblages of all three extant bone-collecting hyaenids 
    Kuhn, Brian F.; Berger, Lee R.; Skinner, J.D. (John Dawson), 1932- (Elsevier, 2009-02)
    Tooth mark frequencies on long bones are examined from the assemblages of all three extant bone-collecting hyaenids. Comparisons are made with a recent study examining tooth mark frequencies and possible sources of variation ...