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Effects of long-term fox baiting on species composition and abundance in an Australian lizard community


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Olsson, M, Wapstra, E, Swan, G, Snaith, E, Clarke, R and Madsen, T 2005 , 'Effects of long-term fox baiting on species composition and abundance in an Australian lizard community' , Austral Ecology, vol. 30, no. 8 , pp. 907-913 , doi: 10.1111/j.1442-9993.2005.01534.x.

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We report on the effects of almost a decade of 1080-fox baiting on a lizard community in a mosaic
Australian habitat. Replicated comparisons of baited versus non-baited control areas with near-identical histories
of bush fires, grazing and climate showed a higher density of red fox tracks (Canis vulpes) in the non-baited areas.
Furthermore, the fox-baited areas showed a more than five times higher density of sand goannas (Varanus gouldii),
a species that strongly overlaps the red fox in food niche breadth and is itself a direct target of fox predation, in
particular its eggs and young. Exclusion of predators from a natural habitat led to significant increases in the
density of small lizards, suggesting that predation can drive lizard population dynamics in this ecosystem.
Replicated pitfall-trapping in three habitats in the control areas (with high fox and low goanna density) versus the
baited areas (with low fox and high goanna density) showed that fox baiting had positive effects on the density of
diurnal scincid lizards in open grassland, whereas the control areas showed higher density of nocturnal gecko
lizards. Our interpretation is that fox removal may result in a shift in the top predator towards the sand goanna.
Historically, this indigenous, endemic species was the natural top predator. It has co-evolved with its prey and
that may have moulded it into a more efficient lizard predator per encounter than the introduced fox.

Item Type: Article
Authors/Creators:Olsson, M and Wapstra, E and Swan, G and Snaith, E and Clarke, R and Madsen, T
Keywords: fox control, lizard community structure, pest management, species composition.
Journal or Publication Title: Austral Ecology
ISSN: 1442-9985
DOI / ID Number: 10.1111/j.1442-9993.2005.01534.x
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