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Naïve, bold, or just hungry? An invasive exotic prey species recognises but does not respond to its predators

  • Alexandra J. R. Carthey
  • Peter B. Banks
Original Paper

Abstract

Alien species experience both costs and benefits in invaded environments, through naiveté of potential prey species, but also predation pressure from native predators. The question of whether alien prey recognise and respond to native predators has been relatively understudied, despite the hypothesised potential for native predators to provide biotic resistance to invasion. There are two main hypotheses about whether exotic prey should recognise native and exotic predators in their new ranges: (1) naiveté—predicting recognition of evolutionarily familiar predators only, and (2) pre-adaptation—predicting recognition of all predators through a generalist recognition template. With regards to antipredator responses, (3) naïveté theory presumes that exotic prey will respond to the predators they recognise, but we suggest that (4) a bold behavioural syndrome, and/or a high marginal value of food in invaded environments might result in weak or absent responses, even to recognised predators. Here we combine the giving-up density framework with behavioural analysis of remote camera footage to experimentally test these ideas in a disturbed, peri-urban, Australian ecosystem, where alien black rats are predated on by alien dogs, foxes, cats, and native quolls. Black rats recognised dogs and foxes, but appear naïve towards quolls. However, they showed no antipredator responses at all, consistent with a bold behavioural syndrome, elevated predation risk, and/or a high marginal value of food in invaded environments.

Keywords

Exotic prey Native predator Olfactory recognition Odour cues Alien Predator–prey interaction 

Notes

Acknowledgements

The authors would like to thank Malith Weerakoon, Timothy Ralph, and a long list of volunteers for assistance with odour sample donation, field work, and video scoring. We would also like to thank the editor and one anonymous reviewer for their comments and suggestions, which greatly improved the manuscript.

Authors’ contributions

AJRC and PBB conceived of and designed the study, AJRC completed the fieldwork, analyses, and wrote the first draft of the manuscript. PBB contributed to the data analysis and editing of the manuscript.

Funding

AJRC was funded by an Ethel Mary Read Grant from the Royal Zoological Society of New South Wales, and a Joyce W Vickery Fund Research Grant from the Linnean Society of New South Wales. AJRC and PBB were funded by a Hermon Slade Foundation grant, HSF 10/10.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethics statement

This work was carried out under Australian ethics approval, granted by the University of New South Wales Animal Ethics Committee (approval number 09/99B).

Data

All data will be deposited in Dryad upon acceptance.

Supplementary material

10530_2018_1782_MOESM1_ESM.docx (1.3 mb)
Supplementary material 1 (DOCX 1321 kb)

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Authors and Affiliations

  1. 1.Department of Biological SciencesMacquarie UniversitySydneyAustralia
  2. 2.School of Life and Environmental SciencesThe University of SydneySydneyAustralia

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