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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE (Open Access)

Evaluation of management options for climate-change adaptation of threatened species: a case study of a restricted orchid

Caitlin R. Rutherford https://orcid.org/0009-0009-8745-0621 A * , Andrew M. Rogers B , Suzanne M. Prober C , Erika M. Roper https://orcid.org/0000-0002-6092-8826 D , Emma Cook E and April E. Reside A B F
+ Author Affiliations
- Author Affiliations

A School of the Environment, University of Queensland, St Lucia, Qld, Australia.

B Centre for Biodiversity and Conservation Science, University of Queensland, St Lucia, Brisbane, Qld 4072, Australia.

C CSIRO Environment, Acton, ACT, Australia.

D NSW Department of Climate Change, Energy, Environment, and Water, Queanbeyan, NSW 2620, Australia.

E ACT Office of Nature Conservation, Canberra, ACT, Australia.

F School of Agriculture and Food Sustainability, The University of Queensland, Gatton, Qld 4343, Australia.


Handling Editor: Noushka Reiter

Australian Journal of Botany 72, BT23092 https://doi.org/10.1071/BT23092
Submitted: 31 October 2023  Accepted: 30 September 2024  Published: 22 October 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context

Global climate is changing rapidly, necessitating timely development of specific, actionable species conservation strategies that incorporate climate-change adaptation. Yet, detailed climate-change adaptation planning is noticeably absent from species management plans. This is problematic for restricted species, which often have greater extinction risk.

Aims

Focusing on the restricted and endangered Tarengo leek orchid (Prasophyllum petilum), we aimed to adapt and test a framework for producing strategies for its management under climate change.

Methods

We used expert elicitation to estimate the severity of threats and assess potential management actions to mitigate threat impacts. We created a conceptual model detailing ecology, threats and likely impacts of climate change on the species, including the interactions between components.

Key results

Although climate change-related threats will affect the species, the most severe threats were non-climate threats including grazing, weeds, and habitat degradation. Fire management was deemed highly beneficial but had low feasibility for some populations. Without management, experts estimated up to a 100% decrease in one P. petilum population, and up to 50% decrease if management remained unchanged.

Conclusions

Management actions with the highest benefit and feasibility addressed the non-climate threats, which, in turn, can give the species the best opportunity to withstand climate-change impacts. Experts highlighted the difficulty of addressing climate threats with such limited knowledge; therefore, further research was recommended.

Implications

This adapted framework enabled a structured analysis of threats, and informed selection of priority adaptation options. We recommend its use for other restricted species for efficient and robust decision-making in climate-change management.

Keywords: climate-change adaptation frameworks, climate-change resilience, controlled burns, expert elicitation, orchid, Prasophyllum, Tarengo leek orchid, threatened species management.

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