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Beyond the disease: is Toxoplasma gondii infection causing population declines in the eastern quoll (Dasyurus viverrinus)?

Citation

Fancourt, BA and Nicol, SC and Hawkins, CE and Jones, ME and Johnson, CN, Beyond the disease: is Toxoplasma gondii infection causing population declines in the eastern quoll (Dasyurus viverrinus)?, International Journal for Parasitology: Parasites and Wildlife, 3, (2) pp. 102-112. ISSN 2213-2244 (2014) [Refereed Article]


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Copyright Statement

Copyright 2014 The Authors-This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).

DOI: doi:10.1016/j.ijppaw.2014.05.001

Abstract

Disease is often considered a key threat to species of conservation significance. For some, it has resulted in localised extinctions and declines in range and abundance. However, for some species, the assertion that a disease poses a significant threat of extinction is based solely on correlative or anecdotal evidence, often inferred from individual clinical case reports. While a speciesí susceptibility to a disease may be demonstrated in a number of individuals, investigations rarely extend to measuring the impact of disease at the population level and its contribution, if any, to population declines. The eastern quoll (Dasyurus viverrinus) is a medium-sized Australian marsupial carnivore that is undergoing severe and rapid decline in Tasmania, its last refuge. Reasons for the decline are currently not understood. Feral cats (Felis catus) may be undergoing competitive release following the ongoing decline of the Tasmanian devil (Sarcophilus harrisii), with cats suppressing eastern quolls through increased predation, competition, exclusion or exposure to diseases such as toxoplasmosis. To investigate the effects of Toxoplasma gondii infection, eastern quoll populations at four sites were regularly screened for the seroprevalence of T. gondii-specific IgG antibodies. Seroprevalence was approximately five times higher at sites with declining quoll populations, and there was a negative association between seroprevalence and quoll abundance. However, T. gondii infection did not reduce quoll survival or reproduction. Despite a high susceptibility to T. gondii infection, eastern quoll populations do not appear to be limited by the parasite or its resultant disease. Significantly higher seroprevalence is a signal of greater exposure to feral cats at sites where eastern quolls are declining, suggesting that increased predation, competition or exclusion by feral cats may be precipitating population declines.

Item Details

Item Type:Refereed Article
Keywords:toxoplasmosis, epidemiology, feral cat, Felis catus, population decline, eastern quoll, wildlife disease, parasites, conservation, species decline
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Conservation and Biodiversity
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Forest and Woodlands Flora, Fauna and Biodiversity
Author:Fancourt, BA (Miss Bronwyn Fancourt)
Author:Nicol, SC (Associate Professor Stewart Nicol)
Author:Hawkins, CE (Dr Clare Hawkins)
Author:Jones, ME (Associate Professor Menna Jones)
Author:Johnson, CN (Professor Christopher Johnson)
ID Code:92923
Year Published:2014
Funding Support:Australian Research Council (DP110103069)
Deposited By:Zoology
Deposited On:2014-07-01
Last Modified:2018-01-31
Downloads:306 View Download Statistics

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