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Age-related variation in the trophic characteristics of a marsupial carnivore, the Tasmanian devil Sarcophilus harrisii

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Bell, O, Jones, ME ORCID: 0000-0001-7558-9022, Ruiz Aravena, M, Hamede, RK ORCID: 0000-0003-1526-225X, Bearhop, S and McDonald, RA 2020 , 'Age-related variation in the trophic characteristics of a marsupial carnivore, the Tasmanian devil Sarcophilus harrisii' , Ecology and Evolution, vol. 10, no. 14 , pp. 7861-7871 , doi: 10.1002/ece3.6513.

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Abstract

Age‐related changes in diet have implications for competitive interactions and for predator–prey dynamics, affecting individuals and groups at different life stages. To quantify patterns of variation and ontogenetic change in the diets of Tasmanian devils Sarcophilus harrisii, a threatened marsupial carnivore, we analyzed variation in the stable isotope composition of whisker tissue samples taken from 91 individual devils from Wilmot, Tasmania from December 2014 to February 2017. Both δ13C and δ15N decreased with increasing age in weaned Tasmanian devils, indicating that as they age devils rely less on small mammals and birds, and more on large herbivores. Devils B mode = 1.042) than devils from 12 to 23 months old (mode = 0.541) and devils ≥24 months old (mode = 0.532). Devils B mode range 0.492–1.083) than devils ≥24 months old (mode range 0.092–0.240). A decrease in δ15N from the older whisker sections to the more recently grown sections in devils <24 months old likely reflects the period of weaning in this species, as this pattern was not observed in devils ≥24 months old. Our data reveal changes in the isotopic composition of devil whiskers with increasing age, accompanied by a reduction in isotopic variation both among population age classes and within individuals, reflecting the effect of weaning in early life, and a likely shift from an initially diverse diet of small mammals, birds, and invertebrates towards increasing consumption of larger herbivores in adulthood.

Item Type: Article
Authors/Creators:Bell, O and Jones, ME and Ruiz Aravena, M and Hamede, RK and Bearhop, S and McDonald, RA
Keywords: Tasmanian devil, diet, stable isotope analysis, Sarcophilus harrisii, carnivore, ontogeny, isotropic niche, trophic niche
Journal or Publication Title: Ecology and Evolution
Publisher: John Wiley & Sons Ltd
ISSN: 2045-7758
DOI / ID Number: 10.1002/ece3.6513
Copyright Information:

© 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, (https://creativecommons.org/licenses/by/4.0/) which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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