Browsing Research Articles (University of Pretoria) by UP Author "Jewell, Oliver Joseph David"
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Browsing Research Articles (University of Pretoria) by UP Author "Jewell, Oliver Joseph David"
Now showing items 1-7 of 7
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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 ...
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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 ...
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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 ...
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Towner, Alison V.; Underhill, Les G.; Jewell, Oliver Joseph David; Smale, Malcolm J. (Public Library of Science, 2013-08-12)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 ...
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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 ...
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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 ...
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Jewell, Oliver Joseph David; Wcisel, Michelle A. (Southern African Wildlife Management Association, 2012-10)A dead, mature male leatherback turtle was sighted at Danger Point, Gansbaai on South Africa’s southwest coast. Leatherback turtle sightings are rare along this coastline although the site lies between two areas of ...
Now showing items 1-7 of 7