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Pacific Conservation Biology Pacific Conservation Biology Society
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RESEARCH ARTICLE (Open Access)

A targeted study to determine the conservation status of a Data Deficient montane lizard, the Eungella shadeskink (Saproscincus eungellensis)

Nicholas A. Scott A # , Jordan Mulder A # , Arman N. Pili A B , Paul M. Oliver https://orcid.org/0000-0003-4291-257X C D , Harry B. Hines D E , Jules E. Farquhar A § and David G. Chapple https://orcid.org/0000-0002-7720-6280 A § *
+ Author Affiliations
- Author Affiliations

A School of Biological Sciences, Monash University, Clayton, Vic, Australia.

B Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany.

C Centre for Planetary Health and Food Security, Griffith University, Nathan, Qld, Australia.

D Biodiversity and Geosciences Program, Queensland Museum, South Brisbane, Qld, Australia.

E Queensland Parks and Wildlife Service and Partnerships, Department of Environment, Science and Innovation, Moggill, Qld, Australia.

* Correspondence to: David.Chapple@monash.edu

# These authors contributed equally to this paper.

§ Joint senior author.

Handling Editor: Dan Lunney

Pacific Conservation Biology 30, PC24050 https://doi.org/10.1071/PC24050
Submitted: 8 July 2024  Accepted: 24 September 2024  Published: 29 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

Combatting biodiversity loss is often hamstrung by a lack of species-specific knowledge. Species considered Data Deficient (DD) on the IUCN Red List are poorly understood and often neglected in conservation investment, despite evidence they are often threatened. Reptiles have the highest percentage of DD species for any terrestrial vertebrate group.

Aims

We aimed to assess the conservation status of the DD Eungella shadeskink (Saproscincus eungellensis), which is endemic to Eungella National Park, Queensland, Australia.

Methods

A combination of a targeted field survey, ecological studies, and species distribution modelling were used.

Key results

Saproscincus eungellensis typically occurred within 25 m of streams, at elevations between 700 and 1000 m. The species is thigmothermic, with a low active body temperature (~23–26°C) and was predominantly observed on rocks and fallen palm fronds. The species has a highly restricted distribution with an estimated Area of Occupancy of 36 km2 and Extent of Occurrence of 81.7 km2, comprising one location (defined by the threat of climate change) with an estimated 16,352–52,892 mature individuals. The main threats are fire, invasive alien species and climate change, with the species forecast to lose all suitable habitat by 2080 under all climate change scenarios.

Conclusions

The species meets listing criteria for Critically Endangered under Criterion B of the International Union for Conservation of Nature.

Implications

Our results support recent studies indicating that some DD species are highly threatened. Our approach provides a template for conducting targeted studies to determine the conservation status of DD species, especially those with restricted ranges.

Keywords: climate change, Eungella National Park, extinction risk, fire, invasive species, IUCN Red List, Scincidae, SDM, species distributional modelling.

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