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dc.contributor.advisorBouwman, H.
dc.contributor.authorBooyens, Paul Lodewyken_US
dc.date.accessioned2012-02-17T08:35:46Z
dc.date.available2012-02-17T08:35:46Z
dc.date.issued2011en_US
dc.identifier.urihttp://hdl.handle.net/10394/5564
dc.descriptionThesis (M.Sc (Environmental Science))--North-West University, Potchefstroom Campus, 2011.
dc.description.abstractThe first of a series of mass mortalities of Nile crocodiles in the Olifants and Letaba rivers in the Kruger National Park (KNP) was reported in the winter of 2008. The present study investigated the levels and possible effects on eggshell thickness of inorganic elements and organic pollutants in Nile crocodile eggs from these rivers, and comparing them with eggs from a reference crocodile farm and a reference dam inside the KNP. The egg contents were analyzed for chlorinated organic compounds and brominated flame retardants. Eggshells and egg contents were analyzed for inorganic elements. The elemental concentrations in the eggshells and contents were low when compared with previous studies. The highest concentrations were found in the eggs from the reference crocodile farm. The eggs from the reference dam and the crocodile farm had thicker shells, and the eggs from the Olifants and Letaba rivers had thinner shells. Not all eggs in a female develop at the same rate, while eggshell formation presumably occurs at the same time for all eggs. As a result, the elemental profile of egg contents may differ between eggs of the same clutch, but less so for the shells. Weak or no associations were found between the elemental concentrations of the content and eggshells and eggshell thinning. A possible organic pollutant–induced eggshell thinning effect was found. The compounds found were not at levels that could have caused the mortalities, but may affect the sex ratios through endocrine disruption. Further studies are therefore required.en_US
dc.publisherNorth-West University
dc.subjectKruger National Parken_US
dc.subjectCrocodile farmen_US
dc.subjectOlifants Riveren_US
dc.subjectLetaba Riveren_US
dc.subjectNhlanganini Damen_US
dc.subjectChlorinated organic compoundsen_US
dc.subjectBrominated flame retardantsen_US
dc.subjectInorganic elementsen_US
dc.subjectEggshell thinningen_US
dc.subjectNasionale Kruger Wildtuinen_US
dc.subjectOlifantsrivieren_US
dc.subjectLetabarivieren_US
dc.subjectNhlanganini damen_US
dc.subjectGechloreerde organiese verbindingsen_US
dc.subjectGebromineerde vlamonderdrukkersen_US
dc.subjectAnorganiese elementeen_US
dc.subjectEierdopverdunningen_US
dc.titlePollutants associated with mass mortality of Nile crocodiles (Crocodylus niloticus) in the Kruger National Park, South Africaen
dc.typeThesisen_US
dc.description.thesistypeMastersen_US
dc.contributor.researchID10063773 - Bouwman, Hindrik (Supervisor)


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