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How important is individual foraging specialisation in invasive predators for native-prey population viability?

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Abstract

Predation by invasive species is a major threat to the persistence of naïve prey. Typically, this negative effect is addressed by suppressing the population size of the invasive predator to a point where the predation pressure does not hinder the viability of the prey. However, this type of intervention may not be effective whenever a few specialised predators are the cause of the decline. We investigated the effects of varying levels of specialised invasive stoats (Mustela erminea) abundance on the long-term viability of simulated kiwi (Apteryx spp.) populations. We explored four scenarios with different proportions of highly specialised stoats, which were those that had a ≥ 0.75 probability of predating kiwi eggs and chicks if they were within their home range: (i) a stoat population composed mostly of generalists (mean: 0.5 probability of predation across the population); (ii) 5% of highly specialised stoats and the remaining being generalists; (iii) 10% of highly specialised stoats and the remaining being generalists; and, (iv) half highly specialised stoats and half generalists. We found that stoat home range sizes, rather than stoat density or the density of highly specialised stoats, was the main driver of kiwi population trends. Stoats with large home ranges were more likely to predate kiwi eggs and chicks as these were more likely to fall within a large home range. More broadly, our findings show how the daily individual ranging and foraging behaviour of an invasive predator can scale-up to shape population trends of naïve prey.

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Acknowledgements

A. Lustig and A. Gormley (Manaaki Whenua) provided critical feedback on a previous version of this manuscript that helped improve it. Thanks to H. Robertson, Jo Ledington, I. Castro, J. Innes, and K. Zub whose feedback helped focus and improve a previous version of this manuscript. This work was supported by the Ministry of Business, Innovation and Employment (New Zealand Government) programme “Security for iconic species: kiwi rescue.” PG-D was partially supported by NERC grant NE/S011641/1 under the Newton Latam programme.

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  1. Pablo García-Díaz

    Present address: School of Biological Sciences, Zoology Building, University of Aberdeen, Aberdeen, AB24 2TZ, UK

Authors and Affiliations

  1. Manaaki Whenua - Landcare Research, P.O. Box 69040, Lincoln, 7640, New Zealand

    Pablo García-Díaz, Rachelle N. Binny & Dean P. Anderson

  2. Te Pūnaha Matatini, Auckland, New Zealand

    Rachelle N. Binny

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PG-D, RNB, and DPA jointly developed, discussed, and agreed on the models and scenarios; PG-D wrote the computer scripts and ran the models (including the simulations, scenarios, and statistical analyses), with contributions by RNB. PG-D, RNB, and DPA discussed and interpreted the results and findings; PG-D led the manuscript writing with substantial contributions by RNB and DPA.

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Correspondence to Pablo García-Díaz.

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García-Díaz, P., Binny, R.N. & Anderson, D.P. How important is individual foraging specialisation in invasive predators for native-prey population viability?. Oecologia 195, 261–272 (2021). https://doi.org/10.1007/s00442-020-04814-6

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