Disease and the devil: density-dependent epidemiological processes explain historical population fluctuations in the Tasmanian devil

Corey Bradshaw, B BROOK

    Research output: Contribution to journalArticle


    Australia's last mega-carnivore marsupial, the Tasmanian devil Sarcophilus harris�, Dasyuridae is endemic to the island state of Tasmania. The recent appearance and rapid spread of a debilitating and usually lethal, cancer-like disease has raised concerns regarding the species' future. We used a demographic matrix modelling approach to evaluate the potential long-term implications of epidemics on this population. Both adult survival and temporally autocorrelated re-occurrence of disease were expressed as a function of female abundance. Large fluctuations in abundance resulted when disease outbreaks were conditioned to be density-dependent; however, this resulted in a low probability of quasi-extinction due to the dissipation of disease transmission at low densities. Epidemic stochasticity alone in an otherwise deterministic model resulted in major population cycles occurring every 77-146 yr, consistent with historical reports. Although epidemics in this species may not result in extinction directly, the contemporary presence of additional mortality sources during periods of low abundance may increase extinction risk. Copyright � Ecography 2005.
    Original languageEnglish
    Pages (from-to)181-190
    Number of pages10
    Issue number2
    Publication statusPublished - 2005


    Cite this