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Conservation trade-offs: island introduction of a threatened predator suppresses invasive mesopredators but eliminates a seabird colony


Scoleri, V and Johnson, CN and Vertigan, P and Jones, ME, Conservation trade-offs: island introduction of a threatened predator suppresses invasive mesopredators but eliminates a seabird colony, Biological Conservation, 248 Article 108635. ISSN 0006-3207 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 Elsevier Ltd.

DOI: doi:10.1016/j.biocon.2020.108635


Offshore islands are ideal for establishing insurance populations of endangered species as they often lack threatening processes found on mainlands. However, introductions of endangered predators can have complex effects on island species. The Tasmanian devil (Sarcophilus harrisii) was introduced to Maria Island in Tasmania, Australia in 2012 to establish an insurance population separate from a novel disease causing declines throughout its native range. Maria Island has small breeding colonies of the short-tailed shearwater (Puffinus tenuirostris) that are preyed on by an invasive mesopredator (feral cat, Felis catus) and an introduced native omnivore (common brushtail possum, Trichosurus vulpecula). We tested whether the introduction of devils increased predation pressure on shearwaters or reduced it by suppressing cat and possum activity. We measured predator activity on shearwater colonies, and surveyed burrow occupancy of shearwater adults and chicks, from 2013 to 2016; we also monitored shearwaters at a colony on a nearby island without terrestrial predators for comparison. Increasing devil activity was associated with decreasing total predator activity at shearwater colonies on Maria Island due to declines in possum and cat activity, evidently caused by predation on possums by devils, and competition with cats. However, shearwater colonies continued to decline, reaching zero occupancy within four years of devil introduction. Because of their larger size and ability to dig, devils had greater impacts on nesting shearwaters than either cats or possums. Conservation translocations of endangered predators must consider trade-offs between their protection and potential impacts on non-threatened native prey species.

Item Details

Item Type:Refereed Article
Keywords:trophic cascades, Tasmanian devil, feral cat, seabird, conservation, island, assisted colonisation, mesopredator suppression, predator introduction, predator-prey, top predator
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Community ecology (excl. invasive species ecology)
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial biodiversity
UTAS Author:Scoleri, V (Mr Vince Scoleri)
UTAS Author:Johnson, CN (Professor Christopher Johnson)
UTAS Author:Vertigan, P (Mr Peter Vertigan)
UTAS Author:Jones, ME (Professor Menna Jones)
ID Code:142313
Year Published:2020
Funding Support:Australian Research Council (DP110103069)
Web of Science® Times Cited:5
Deposited By:Zoology
Deposited On:2021-01-07
Last Modified:2021-03-03

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