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High prevalence of Leucocytozoon spp. in the endangered yellow-eyed penguin (Megadyptes antipodes) in the sub-Antarctic regions of New Zealand

Published online by Cambridge University Press:  29 January 2013

L. S. ARGILLA ,
L. HOWE ,
B. D. GARTRELL  and
M. R. ALLEY
L. S. ARGILLA
Affiliation:
New Zealand Wildlife Health Centre, Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
L. HOWE
Affiliation:
New Zealand Wildlife Health Centre, Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
B. D. GARTRELL*
Affiliation:
New Zealand Wildlife Health Centre, Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
M. R. ALLEY
Affiliation:
New Zealand Wildlife Health Centre, Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
*
*Corresponding author: New Zealand Wildlife Health Centre, Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand. Tel: 011 64 6 356 9099. Fax: 011 64 6 350 5714. E-mail: [email protected]
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Summary

Yellow-eyed penguins (YEPs) have suffered major population declines over the past 30 years, with no single cause established. Leucocytozoon was first identified in yellow-eyed penguins in 2005. During the 2008/09 breeding season, a high mortality was seen in both mainland yellow-eyed penguins as well as those on Enderby Island of the Auckland Islands archipelago. A high overall prevalence of Leucocytozoon spp. in association with a high incidence of chick mortality was observed during this period on Enderby Island. One chick had histological evidence of leucocytozoonosis with megaloschizonts in multiple organs throughout its body. In addition, a high prevalence (73·7%) of Leucocytozoon was observed by PCR in the blood of adult Enderby yellow-eyed penguins taken during the 2006/07 season. These findings were different from the low prevalence detected by PCR on the coast of the South Island (11%) during the 2008/2009 breeding session and earlier on Campbell Island (21%) during the 2006/2007 breeding session. The Leucocytozoon spp. sequences detected lead us to conclude that the Leucocytozoon parasite is common in yellow-eyed penguins and has a higher prevalence in penguins from Enderby Island than those from Campbell Island and the mainland of New Zealand. The Enderby Island yellow-eyed penguins are infected with a Leucocytozoon spp. that is genetically distinct from that found in other yellow-eyed penguin populations. The role of Leucocytozoon in the high levels of chick mortality in the yellow-eyed penguins remains unclear.

Keywords

Leucocytozoonyellow-eyed penguinEnderby IslandmortalityNew Zealand
Type
Research Article
Information
Parasitology , Volume 140 , Issue 5 , April 2013 , pp. 672 - 682
Copyright
Copyright © Cambridge University Press 2013

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Footnotes

†

Current address: Wellington Zoo, Newtown, Wellington, New Zealand.

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