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Afternoon shedding of a new species of Isospora (Apicomplexa) in the endangered Regent Honeyeater (Xanthomyza phrygia)

Published online by Cambridge University Press:  28 April 2011

VICTORIA MORIN-ADELINE ,
LARRY VOGELNEST ,
NAVNEET K. DHAND ,
MICHAEL SHIELS ,
WARRICK ANGUS  and
JAN ŠLAPETA
VICTORIA MORIN-ADELINE
Affiliation:
Faculty of Veterinary Science, University of Sydney, New South Wales 2006, Australia
LARRY VOGELNEST
Affiliation:
Taronga Zoo, Taronga Conservation Society Australia, Bradleys Head Road, Mosman, New South Wales 2088, Australia
NAVNEET K. DHAND
Affiliation:
Faculty of Veterinary Science, University of Sydney, New South Wales 2006, Australia
MICHAEL SHIELS
Affiliation:
Taronga Zoo, Taronga Conservation Society Australia, Bradleys Head Road, Mosman, New South Wales 2088, Australia
WARRICK ANGUS
Affiliation:
Taronga Zoo, Taronga Conservation Society Australia, Bradleys Head Road, Mosman, New South Wales 2088, Australia
JAN ŠLAPETA*
Affiliation:
Faculty of Veterinary Science, University of Sydney, New South Wales 2006, Australia
*
*Corresponding author: McMaster Building B14, Faculty of Veterinary Science, University of Sydney, New South Wales 2006, Australia. Tel: +61 2 9251 2025. Fax: +61 2 935 17348. E-mail: jan.slapeta@sydney.edu.au
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Summary

The Regent Honeyeater (Xanthomyza phyrigia) is an endangered Australian bird species. Breeding populations have been established at Australian zoos in support of re-introduction programmes. This species is the host of a new species of Isospora (Apicomplexa). Oocysts are spherical, 25·8 (22·5–28·75) by 23·8 (20–26·25) μm with a colourless to pale yellow smooth wall undergoing rapid exogenous sporulation, 90% sporulated oocysts in 8 h at 20°C. Each oocyst contains 1 polar granule. Sporocysts are ovoid, 18·67 (17–19) by 9·49 (9–10) μm with a flat Stieda body and spherical substieda body devoid of a hyaline body. The asexual stages and sexual phase is within the enterocytes of the duodenum and jejunum. Faeces collected in the morning (AM, n=84) and in the afternoon (PM, n=90) revealed significant diurnal periodicity in oocyst shedding; 21% (18 of 84) of the AM were positive with the mean of 499 oocysts.g−1 compared to the PM with 91% (82 of 90) bird faeces positive with the mean of 129 723 oocysts.g−1. Therefore, parasite checks for these birds should be carried out in the afternoon to obtain an accurate result. The ecological significance of the high parasite burden in captive birds requires further investigation and comparison to the wild counterparts.

Keywords

coccidiaIsosporaRegent Honeyeaterhoneyeaterdiurnal sheddingoocystsrecovery programme
Type
Research Article
Information
Parasitology , Volume 138 , Issue 6 , May 2011 , pp. 713 - 724
Copyright
Copyright © Cambridge University Press 2011

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