+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

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

, : 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): 102-112

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 species' 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.


PMID: 25161908

DOI: 10.1016/j.ijppaw.2014.05.001

Other references

Salit I.E., 1980: The attachment of neisseria meningitidis to erythrocytes and pharyngeal cells. Clinical Research 28(2): 378A

Hong, S.Woo.; Lee, W.Yong.; Lee, H.Kyung., 2013: Hepatic paraganglioma and multifocal gastrointestinal stromal tumor in a female: Incomplete Carney triad. The Carney triad (CT) describes the coexistence of multiple neoplasms including gastrointestinal stromal tumors (GISTs), extra-adrenal paraganglioma and pulmonary chondroma. At least two neoplastic tumors are required for diagnosis. In most cases,...

Scott Andrew C. (reviewer), 1981: Upper Carboniferous fossil flora of Nova Scotia; book review. Review of Palaeobotany and Palynology 34(3-4): 408-409

Zhai, J.Pang.; Tang, Z.Kang.; Lam, F.L.Y.; Hu, X., 2006: Thermal decomposition of carbon precursors in decorated AFI zeolite crystals. Mass spectrometry and thermogravimetric analysis are used to explore the thermal decomposition of carbon precursors (primarily the tripropylammonium cations) occluded within AlPO(4)-5 (AFI) crystals prepared in various media (in the presence or ab...

Nilner, K., 1981: Studies of electrochemical action in the oral cavity. A method for in vivo measurements of potentials and polarizations of metallic dental restorations was presented. The precision of this method allowed for calculation to be made of the electrochemical action in the oral cavity in terms of currents...

Johnson, Pw, 1978: Nematode studies. Pesticide research report: 49-555

Keber, J., 1970: The use of uterospasmolytic drugs in obstetrics. Deutsche Tierarztliche Wochenschrift 77(17): 426-428

Claypool, D.A.; Hopkins, D.G.; Richardson, J.L., 1990: Soil morphology and stratigraphy on an erosional footslope: Dickenson Research Center in western North Dakota. In 1987, a first order soil survey (1:2,500 scale) of crop rotation plots on the Dickenson Research Center in southwestern North Dakota was made. The site is located on an erosional footslope with a thin cover of sediments. Bt horizon thickness is...

Cooney, J.L.; Cooper, S.; Grant, C.; Sevarino, K.; Krishnan-Sarin, S.; Gutierrez, I.A.; Cooney, N.L., 2016: A Randomized Trial of Contingency Management for Smoking Cessation During Intensive Outpatient Alcohol Treatment. This randomized clinical trial was designed to evaluate the efficacy of contingency management (CM) for smoking cessation for smokers with alcohol abuse or dependence delivered concurrently with intensive outpatient alcohol treatment. The study al...

Jensen, M.M.; Rasmussen, A.F., 1963: Stress and susceptibility to viral infection. I. Response of adrenals, liver, thymus, spleen and peripheral leukocyte counts to sound stress. Journal of Immunology 90: 17-20