An investigation of the causes of mortality in yellow-eyed penguins (Megadyptes antipodes) across their range with specific emphasis on the role played by Leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Palmerston North, New Zealand
Over the past 40 years, there have been frequent mass mortality events documented in yellow-eyed penguins (Megadyptes antipodes). In most cases, these mortality events have resulted in significant adult or chick mortality resulting in a population decline. Previous studies in yellow-eyed penguin mor...
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ftmasseyuniv:oai:mro.massey.ac.nz:10179/8301 2023-05-15T16:06:09+02:00 An investigation of the causes of mortality in yellow-eyed penguins (Megadyptes antipodes) across their range with specific emphasis on the role played by Leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Palmerston North, New Zealand Argilla, Lisa Shelley 2015 http://hdl.handle.net/10179/8301 en eng Massey University http://hdl.handle.net/10179/8301 Q112236809 The Author Yellow-eyed penguin Megadyptes antipodes Leucocytozoon Thesis 2015 ftmasseyuniv 2022-08-09T17:13:15Z Over the past 40 years, there have been frequent mass mortality events documented in yellow-eyed penguins (Megadyptes antipodes). In most cases, these mortality events have resulted in significant adult or chick mortality resulting in a population decline. Previous studies in yellow-eyed penguin mortality have been attributed to events such as unidentified phytotoxins, starvation, poor nutrition, climatic events and infectious causes. However, the full impact of these factors on yellow-eyed penguin population decline and mortality events is not well understood. During the Austral summer of 2008/09, there were mortality events documented in both the subantarctic and mainland yellow-eyed penguin populations with different patterns of mortality and different factors associated with the mortality between both locations. A high overall prevalence of Leucocytozoon spp. in association with a high incidence of chick mortality was observed during this period on Enderby Island. Despite its endemic nature in this population, statistical analysis demonstrated that infection with Leucocytozoon did not play a significant role in mass mortality of Enderby Island chicks, other than as a cause of sporadic individual mortality. The Leucocytozoon spp. sequences detected lead to the conclusion that the Leucocytozoon parasite is endemic 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. A very low mortality was observed in the Catlins population despite there being a high level of human impact at some nest regions within this location. A high level of mortality was described in the Otago Peninsula population with this population affected by high human disturbance ... Thesis Enderby Island Massey University: Massey Research Online Austral New Zealand Campbell Island ENVELOPE(169.500,169.500,-52.500,-52.500) |
institution |
Open Polar |
collection |
Massey University: Massey Research Online |
op_collection_id |
ftmasseyuniv |
language |
English |
topic |
Yellow-eyed penguin Megadyptes antipodes Leucocytozoon |
spellingShingle |
Yellow-eyed penguin Megadyptes antipodes Leucocytozoon Argilla, Lisa Shelley An investigation of the causes of mortality in yellow-eyed penguins (Megadyptes antipodes) across their range with specific emphasis on the role played by Leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Palmerston North, New Zealand |
topic_facet |
Yellow-eyed penguin Megadyptes antipodes Leucocytozoon |
description |
Over the past 40 years, there have been frequent mass mortality events documented in yellow-eyed penguins (Megadyptes antipodes). In most cases, these mortality events have resulted in significant adult or chick mortality resulting in a population decline. Previous studies in yellow-eyed penguin mortality have been attributed to events such as unidentified phytotoxins, starvation, poor nutrition, climatic events and infectious causes. However, the full impact of these factors on yellow-eyed penguin population decline and mortality events is not well understood. During the Austral summer of 2008/09, there were mortality events documented in both the subantarctic and mainland yellow-eyed penguin populations with different patterns of mortality and different factors associated with the mortality between both locations. A high overall prevalence of Leucocytozoon spp. in association with a high incidence of chick mortality was observed during this period on Enderby Island. Despite its endemic nature in this population, statistical analysis demonstrated that infection with Leucocytozoon did not play a significant role in mass mortality of Enderby Island chicks, other than as a cause of sporadic individual mortality. The Leucocytozoon spp. sequences detected lead to the conclusion that the Leucocytozoon parasite is endemic 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. A very low mortality was observed in the Catlins population despite there being a high level of human impact at some nest regions within this location. A high level of mortality was described in the Otago Peninsula population with this population affected by high human disturbance ... |
format |
Thesis |
author |
Argilla, Lisa Shelley |
author_facet |
Argilla, Lisa Shelley |
author_sort |
Argilla, Lisa Shelley |
title |
An investigation of the causes of mortality in yellow-eyed penguins (Megadyptes antipodes) across their range with specific emphasis on the role played by Leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Palmerston North, New Zealand |
title_short |
An investigation of the causes of mortality in yellow-eyed penguins (Megadyptes antipodes) across their range with specific emphasis on the role played by Leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Palmerston North, New Zealand |
title_full |
An investigation of the causes of mortality in yellow-eyed penguins (Megadyptes antipodes) across their range with specific emphasis on the role played by Leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Palmerston North, New Zealand |
title_fullStr |
An investigation of the causes of mortality in yellow-eyed penguins (Megadyptes antipodes) across their range with specific emphasis on the role played by Leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Palmerston North, New Zealand |
title_full_unstemmed |
An investigation of the causes of mortality in yellow-eyed penguins (Megadyptes antipodes) across their range with specific emphasis on the role played by Leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of Master of Veterinary Science in Wildlife Health at Massey University, Palmerston North, New Zealand |
title_sort |
investigation of the causes of mortality in yellow-eyed penguins (megadyptes antipodes) across their range with specific emphasis on the role played by leucocytozoon : a thesis presented in partial fulfilment of the requirements for the degree of master of veterinary science in wildlife health at massey university, palmerston north, new zealand |
publisher |
Massey University |
publishDate |
2015 |
url |
http://hdl.handle.net/10179/8301 |
long_lat |
ENVELOPE(169.500,169.500,-52.500,-52.500) |
geographic |
Austral New Zealand Campbell Island |
geographic_facet |
Austral New Zealand Campbell Island |
genre |
Enderby Island |
genre_facet |
Enderby Island |
op_relation |
http://hdl.handle.net/10179/8301 Q112236809 |
op_rights |
The Author |
_version_ |
1766402073124929536 |