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Isotopic niche variation in Tasmanian devils Sarcophilus harrisii with progression of devil facial tumor disease

Citation

Bell, O and Jones, ME and Cunningham, CX and Ruiz-Aravena, M and Hamilton, DG and Comte, S and Hamede, RK and Bearhop, S and McDonald, RA, Isotopic niche variation in Tasmanian devils Sarcophilus harrisii with progression of devil facial tumor disease, Ecology and Evolution, 11, (12) pp. 8038-8053. ISSN 2045-7758 (2021) [Refereed Article]


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DOI: doi:10.1002/ece3.7636

Abstract

Devil facial tumor disease (DFTD) is a transmissible cancer affecting Tasmanian devils Sarcophilus harrisii. The disease has caused severe population declines and is associated with demographic and behavioral changes, including earlier breeding, younger age structures, and reduced dispersal and social interactions. Devils are generally solitary, but social encounters are commonplace when feeding upon large carcasses. DFTD tumors can disfigure the jaw and mouth and so diseased individuals might alter their diets to enable ingestion of alternative foods, to avoid conspecific interactions, or to reduce competition. Using stable isotope analysis (δ13C and δ15N) of whiskers, we tested whether DFTD progression, measured as tumor volume, affected the isotope ratios and isotopic niches of 94 infected Tasmanian devils from six sites in Tasmania, comprising four eucalypt plantations, an area of smallholdings and a national park. Then, using tissue from 10 devils sampled before and after detection of tumors and 8 devils where no tumors were detected, we examined whether mean and standard deviation of δ13C and δ15N of the same individuals changed between healthy and diseased states. δ13C and δ15N values were generally not related to tumor volume in infected devils, though at one site, Freycinet National Park, δ15N values increased significantly as tumor volume increased. Infection with DFTD was not associated with significant changes in the mean or standard deviation of δ13C and δ15N values in individual devils sampled before and after detection of tumors. Our analysis suggests that devils tend to maintain their isotopic niche in the face of DFTD infection and progression, except where ecological conditions facilitate a shift in diets and feeding behaviors, demonstrating that ecological context, alongside disease severity, can modulate the behavioral responses of Tasmanian devils to DFTD.

Item Details

Item Type:Refereed Article
Keywords:devil facial tumour disease, Sarcophilus harrisii, sickness behavior, stable isotope analysis, Tasmanian devil
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal behaviour
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial biodiversity
UTAS Author:Jones, ME (Professor Menna Jones)
UTAS Author:Cunningham, CX (Mr Calum Cunningham)
UTAS Author:Ruiz-Aravena, M (Mr Manuel Ruiz Aravena)
UTAS Author:Hamilton, DG (Mr David Hamilton)
UTAS Author:Comte, S (Mr Sebastien Comte)
UTAS Author:Hamede, RK (Dr Rodrigo Hamede Ross)
ID Code:150228
Year Published:2021
Web of Science® Times Cited:2
Deposited By:Office of the School of Natural Sciences
Deposited On:2022-06-03
Last Modified:2022-07-27
Downloads:0

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