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Dancing with the devil: Could native predators inside 'predator free' havens be good for the conservation of threatened native prey species?

Harrison, Natasha1; Phillips, Ben2; Mitchell, Nicola1; Macmahon, Brian3; Rasmussen, Deanna3; Lacey, Peter3; Fanson, Kerry4; Wayne, Adrian3

Published Dec 12, 2024 on Dryad. https://doi.org/10.5061/dryad.tx95x6b74

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Dec 12, 2024 version files 158.17 KB

Abstract

As invasive predators continue to drive global biodiversity loss, predator-free havens are rapidly being established to recover threatened fauna. An unintended consequence of these efforts is that havened populations can lose anti-predator traits, making them poorly suited for reintroductions into landscapes that contain predators. One approach showing promise in preventing the loss of these critical responses from havened populations is in situ predator exposure. Here we evaluate this via experimental translocations to determine whether predation pressure from a native mesopredator (chuditch; Dasyurus geoffroii) is effective in retaining behavioural and morphological anti-predator traits in the Endangered woylie (Bettongia penicillata ogilbyi). We conducted replicated reintroductions of semi-havened (free from invasive predators but exposed to chuditch) and non-havened (control) woylies into vacant bushland containing chuditch, feral foxes (Vulpes vulpes) and feral cats (Felis catus). We monitored woylie survival, reproduction, physiology (faecal glucocorticoid metabolites, fGCM), and proxies for behavioural and morphological anti-predator traits before and for ten months after their release. We found no effects of source population on weight, pes length, agitation behaviour, or fGCM. Survival probability was higher for males, and for individuals with higher fGCM levels, but we could not attribute differences in woylie survival to whether they originated from a haven. This suggests that sustained predation pressure from chuditch inside the haven has been effective in maintaining anti-predator responses and supporting survival of woylies faced with novel invasive predators. However, it will be crucial to understand thresholds of in situ predation pressure across contexts that havened fauna can withstand before recommending broad scale adoption of this strategy. Authors should follow a formula in which point 1 sets the context and need for the work; point 2 indicates the approach and methods used; the next 2-3 points outline the main results; and the last point identifies the wider implications and relevance to management or policy.