University Of Tasmania
150228 - Isotopic niche variation in Tasmanian devils Sarcophilus harrisii with progression of devil facial tumor disease.pdf (1.42 MB)
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Isotopic niche variation in Tasmanian devils Sarcophilus harrisii with progression of devil facial tumor disease

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posted on 2023-05-21, 07:59 authored by Bell, O, Menna JonesMenna Jones, Calum CunninghamCalum Cunningham, Ruiz-Aravena, M, David HamiltonDavid Hamilton, Comte, S, Rodrigo Hamede RossRodrigo Hamede Ross, Bearhop, S, McDonald, RA
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.


Publication title

Ecology and Evolution










School of Natural Sciences


John Wiley & Sons Ltd

Place of publication

United Kingdom

Rights statement

© 2021. Ecology and Evolution published by John Wiley & Sons Ltd. The Authors. This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License (, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Repository Status

  • Open

Socio-economic Objectives

Terrestrial biodiversity