Abstract
This study represents the first major survey of avian hematozoa from southern Africa and the only one dealing with blood parasites of vultures. Blood smears from 506 Rhodesian, Botswanan and South African vultures (Hooded, White-headed, Lappetfaced, Cape Griffon and Whitebacked Vultures) were examined for hematozoa. Haemoproteus janovyi sp. n. was observed in 35.2% of the vultures, Leucocytozoon toddi in 0.8%, Plasmodium fallax in 0.6%, Atoxoplasma sp. in 1.4% and microfilariae in 0.2%. Hematozoan prevalence increased with age of the vultures. Only 2 of 133 nestlings sampled during the dry season had patent parasitemias (L. toddi). Haemoproteid prevalence in immature vultures was depressed during the dry season, whereas it was stable throughout the year in adults. The only species which nests on cliffs (the Cape Griffon Vulture) did not harbor hematozoa whereas the other species which nest and roost in trees were infected with at least one hematozoan species.
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