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Adapting reintroduction tactics in successive trials increases the likelihood of establishment for an endangered carnivore in a fenced sanctuary

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Listed:
  • Belinda A Wilson
  • Maldwyn J Evans
  • William G Batson
  • Sam C Banks
  • Iain J Gordon
  • Donald B Fletcher
  • Claire Wimpenny
  • Jenny Newport
  • Emily Belton
  • Annette Rypalski
  • Tim Portas
  • Adrian D Manning

Abstract

Threatened species recovery programs are increasingly turning to reintroductions to reverse biodiversity loss. Here we present a real-world example where tactics (techniques which influence post-release performance and persistence) and an adaptive management framework (which incorporates feedback between monitoring and future actions) improved reintroduction success. Across three successive trials we investigated the influence of tactics on the effective survival and post-release dispersal of endangered eastern quolls (Dasyurus viverrinus) reintroduced into Mulligans Flat Woodland Sanctuary, Australian Capital Territory. Founders were monitored for 42 days post-release, and probability of survival and post-release dispersal were tested against trial, origin, sex, den sharing and presence of pouch young. We adopted an adaptive management framework, using monitoring to facilitate rapid learning and to implement interventions that improved reintroduction success. Founders released in the first trial were less likely to survive (28.6%, n = 14) than those founders released the second (76.9%, n = 13) and third trials (87.5%, n = 8). We adapted several tactics in the second and third trials, including the selection of female-only founders to avoid elevated male mortality, and post-mating releases to reduce stress. Founders that moved dens between consecutive nights were less likely to survive, suggesting that minimising post-release dispersal can increase the probability of survival. The probability of moving dens was lower in the second and third trials, for females, and when den sharing with another founder. This study demonstrates that, through iterative trials of tactics involving monitoring and learning, adaptive management can be used to significantly improve the success of reintroduction programs.

Suggested Citation

  • Belinda A Wilson & Maldwyn J Evans & William G Batson & Sam C Banks & Iain J Gordon & Donald B Fletcher & Claire Wimpenny & Jenny Newport & Emily Belton & Annette Rypalski & Tim Portas & Adrian D Mann, 2020. "Adapting reintroduction tactics in successive trials increases the likelihood of establishment for an endangered carnivore in a fenced sanctuary," PLOS ONE, Public Library of Science, vol. 15(6), pages 1-17, June.
    • Handle: RePEc:plo:pone00:0234455
    DOI: 10.1371/journal.pone.0234455
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    References listed on IDEAS

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    1. Lenth, Russell V., 2016. "Least-Squares Means: The R Package lsmeans," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 69(i01).
    2. Bates, Douglas & Mächler, Martin & Bolker, Ben & Walker, Steve, 2015. "Fitting Linear Mixed-Effects Models Using lme4," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 67(i01).
    3. Katherine E Moseby & Brydie M Hill & Tyrone H Lavery, 2014. "Tailoring Release Protocols to Individual Species and Sites: One Size Does Not Fit All," PLOS ONE, Public Library of Science, vol. 9(6), pages 1-12, June.
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