Environmental effects are stronger than human effects on mammalian predator-prey relationships in arid Australian ecosystems

Allen, Benjamin L. and Fawcett, Alana and Anker, Alison and Engeman, Richard M. and Lisle, Allan and Leung, Luke K.-P. (2018) Environmental effects are stronger than human effects on mammalian predator-prey relationships in arid Australian ecosystems. Science of the Total Environment, 610-611. pp. 451-461. ISSN 0048-9697

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Abstract

Climate (drought, rainfall), geology (habitat availability), land use change (provision of artificial waterpoints, introduction of livestock), invasive species (competition, predation), and direct human intervention (lethal control of top-predators) have each been identified as processes driving the sustainability of threatened fauna populations. We used a systematic combination of empirical observational studies and experimental manipulations to comprehensively evaluate the effects of these process on a model endangered rodent, dusky hopping-mice (Notomys fuscus). We established a large manipulative experiment in arid Australia, and collected information from relative abundance indices, camera traps, GPS-collared dingoes (Canis familiaris) and dingo scats, along with a range of related environmental data (e.g. rainfall, habitat type, distance to artificial water etc.). We show that hopping-mice populations were most strongly influenced by geological and climatic effects of resource availability and rainfall, and not land use, invasive species, or human effects of livestock grazing, waterpoint provision, or the lethal control of dingoes. Hopping-mice distribution declined along a geological gradient of more to less available hopping-mice habitat (sand dunes), and their abundance was driven by rainfall. Hopping-mice populations fluctuated independent of livestock presence, artificial waterpoint availability or repeated lethal dingo control. Hopping-mice populations appear to be limited first by habitat availability, then by food availability, then by predation. Contemporary top-predator control practices (for protection of livestock) have little influence on hopping-mice behaviour or population dynamics. Given our inability to constrain the effects of predation across broad scales, management actions focusing on increasing available food and habitat (e.g. alteration of fire and grazing regimes) may have a greater chance of improving the conservation status of hopping-mice and other small mammals in arid areas. Our study also reaffirms the importance of using systematic and experimental approaches to detect true drivers of population distribution and dynamics where multiple potential drivers operate simultaneously.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Supplementary material is essential for understanding the main paper - one cannot be read without the other. Permanent restricted access to main article (Published version). Suppl Material (Submitted version) deposited according to the copyright policy of the publisher.
Faculty/School / Institute/Centre: Historic - Institute for Agriculture and the Environment
Date Deposited: 12 Feb 2019 01:14
Last Modified: 14 Feb 2019 02:20
Uncontrolled Keywords: dingoes, hopping-mice, rabbits, sand dune, arid zone, trophic cascade, predation, rodent, threatened species, drought, prey switching
Fields of Research : 06 Biological Sciences > 0608 Zoology > 060801 Animal Behaviour
05 Environmental Sciences > 0502 Environmental Science and Management > 050202 Conservation and Biodiversity
05 Environmental Sciences > 0502 Environmental Science and Management > 050211 Wildlife and Habitat Management
Socio-Economic Objective: D Environment > 96 Environment > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales
Identification Number or DOI: 10.1016/j.scitotenv.2017.08.051
URI: http://eprints.usq.edu.au/id/eprint/35332

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