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Identification of toxigenic Microcystis strains after incidents of wild animal mortalities in the Kruger National Park, South Africa

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dc.contributor.author Oberholster, Paul Johan
dc.contributor.author Myburgh, Jan G.
dc.contributor.author Govender, Danny
dc.contributor.author Bengis, Roy G.
dc.contributor.author Botha, Anna-Maria
dc.date.accessioned 2009-03-16T12:27:41Z
dc.date.available 2009-03-16T12:27:41Z
dc.date.issued 2009
dc.identifier.citation Oberholster,P.J.,et al.,Identification of toxigenic Microcystis strains after incidents of wild animal mortalities in the Kruger National Park, South Africa. Ecotoxicology and Environmental Safety (2009), doi: 10.1016/j.ecoenv. 2008.12.014 en_US
dc.identifier.issn 0147-6513
dc.identifier.other 10.1016/j.ecoenv.2008.12.014
dc.identifier.uri http://hdl.handle.net/2263/9278
dc.description.abstract The eutrophic process potentially caused by a high urine and faecal load resulting from an unusually high hippopotamus(Hippopotamusamphibious) density in the Nhlanganzwane Dam, Kruger National Park, South Africa, triggered a chain of events characterised by an increase in the growth of primary producers (Microcystis aeruginosa). This increase in M. aeruginosa biomass was followed by biointoxication incidents in wild animals. In this study, we determine if a M. aeruginosa bloom with a total microcyst in level of 23,718 mg l 1 have been responsible for mortalities of megaherbivores in the Nhlanganzwane Dam. We further use microcystin molecular markers derived from the mcy gene cluster to identify potentially toxigenic environmental Microcystis strains in the dam during the occurrence of animal intoxications. The estimated total microcystin-LR daily intake by an adult male whiterhinoceros (Ceratotheriumsimum) from cyanobacterial-contaminated water of the dam during the toxic event was an order of magnitude higher(754.29 mgkg 1 bw)in comparison with the lowest observed adverse effecting level(LOAEL)value measured for pigs in a previous study by other authors. In this study the presence of toxic cyanobacterial strains was confirmed with the use of molecular markers that detected the presence of the mcy gene cluster responsible for the production of toxin by M. aeruginosa. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights Elsevier en_US
dc.subject Eutrophication en_US
dc.subject Wild animal bio-intoxication en_US
dc.subject Megaherbivores en_US
dc.subject Mcy Gene cluster en_US
dc.subject Conservation areas en_US
dc.subject.lcsh Microcystis aeruginosa -- Kruger National Park, South Africa
dc.subject.lcsh Water quality biological assessment -- Kruger National Park, South Africa
dc.title Identification of toxigenic Microcystis strains after incidents of wild animal mortalities in the Kruger National Park, South Africa en_US
dc.type Postprint Article en_US

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