Publications

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[adenovirus infections in psittacines].diagnostic investigations were carried out in a fatal disease of several african grey parrots (psittacus erithacus) and cape parrots (poicephalus robustus) in a large breeding plant. electron microscopically examination of liver and intestine, the organs with the most prominent pathomorphological changes, regularly revealed adenoviruses. necrotizing hepatitis and catarrhal to haemorrhagic enteritis dominated on histopathological examination. numerous basophilic intranuclear inclusion bodies in h ...19989931996
evidence of unique genotypes of beak and feather disease virus in southern africa.psittacine beak and feather disease (pbfd), caused by beak and feather disease virus (bfdv), is the most significant infectious disease in psittacines. pbfd is thought to have originated in australia but is now found worldwide; in africa, it threatens the survival of the indigenous endangered cape parrot and the vulnerable black-cheeked lovebird. we investigated the genetic diversity of putative bfdvs from southern africa. feathers and heparinized blood samples were collected from 27 birds repre ...200415308722
fatal leucocytozoon infection in a captive grey-headed parrot (poicephalus robustus suahelicus).a necropsy was conducted on a female grey-headed parrot (poicephalus robustus suahelicus) that died following signs of depression, ruffled feathers, and inappetence. microscopic examination revealed the presence of hemoprotozoa in the liver. a nested polymerase chain reaction (pcr), targeting the mitochondrial cytochrome b gene of haemoproteus species, plasmodium species, and leucocytozoon species, was performed on frozen tissue samples collected at necropsy. the hemoprotozoa were identified by ...201931251506
when and where to move: dynamic occupancy models explain the range dynamics of a food nomadic bird under climate and land cover change.globally, long-term research is critical to monitor the responses of tropical species to climate and land cover change at the range scale. citizen science surveys can reveal the long-term persistence of poorly known nomadic tropical birds occupying fragmented forest patches. we applied dynamic occupancy models to 13 years (2002-2014) of citizen science-driven presence/absence data on cape parrot (poicephalus robustus), a food nomadic bird endemic to south africa. we modeled its underlying range ...201728799245
beak and feather disease virus: correlation between viral load and clinical signs in wild cape parrots (poicepahlus robustus) in south africa.psittacine beak and feather disease (pbfd), the most prevalent viral disease affecting psittacines, is caused by beak and feather disease virus (bfdv). this study assessed viral load using qpcr in a wild cape parrot population affected by pbfd and compared it to overall physical condition based on clinical signs attributable to pbfd. a significant inverse correlation between viral load and overall physical condition was found, which confirmed that clinical signs may confidently be used to diagno ...201525193072
beak and feather disease viruses circulating in cape parrots (poicepahlus robustus) in south africa.captive and wild psittacines are vulnerable to the highly contagious psittacine beak and feather disease. the causative agent, beak and feather disease virus (bfdv), was recently detected in the largest remaining population of endangered cape parrots (poicepahlus robustus), which are endemic to south africa. full-length genomes were isolated and sequenced from 26 blood samples collected from wild and captive cape parrots to determine possible origins of infection. all sequences had characteristi ...201525209153
testing of microsatellite multiplexes for individual identification of cape parrots (poicephalus robustus): paternity testing and monitoring trade.illegal trade in rare wildlife species is a major threat to many parrot species around the world. wildlife forensics plays an important role in the preservation of endangered or threatened wildlife species. identification of illegally harvested or traded animals through dna techniques is one of the many methods used during forensic investigations. natural populations of the south african endemic cape parrot (poicephalus robustus) are negatively affected by the removal of eggs and chicks for the ...201728344897
molecular systematics of the cape parrot (poicephalus robustus): implications for taxonomy and conservation.the taxonomic position of the cape parrot (poicephalus robustus robustus) has been the focus of much debate. a number of authors suggest that the cape parrot should be viewed as a distinct species separate from the other two p. robustus subspecies (p. r. fuscicollis and p. r. suahelicus). these recommendations were based on morphological, ecological, and behavioural assessments. in this study we investigated the validity of these recommendations using multilocus dna analyses. we genotyped 138 sp ...201526267261
twenty-two polymorphic microsatellite loci aimed at detecting illegal trade in the cape parrot, poicephalus robustus (psittacidae, aves).twenty-two polymorphic microsatellite loci were characterized in the cape parrot, poicephalus robustus. nineteen loci were newly isolated from two cape parrot genomic libraries, and three loci isolated from other parrot species. loci were characterized in 40 unrelated captive cape parrots held by aviculturalists. the loci displayed between two and 24 alleles, with the observed heterozygosities ranging between 0.10 and 0.94. this locus set is suitable for identifying clarifying parentage (parenta ...201021564999
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