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Wildlife Research Wildlife Research Society
Ecology, management and conservation in natural and modified habitats
RESEARCH ARTICLE

Environmental DNA detection of spot-tailed quoll from soil is unlikely to be useful for routine monitoring

Lauren C. White https://orcid.org/0000-0001-8085-9293 A * , Jenny L. Nelson A , Maria Cardoso B and Carlo Pacioni https://orcid.org/0000-0001-5115-4120 A C
+ Author Affiliations
- Author Affiliations

A Arthur Rylah Institute for Environmental Research, Department of Energy, Environment and Climate Action, Heidelberg, Vic. 3084, Australia.

B Parks Victoria, 171-173 Nicholson Street, Orbost, Vic. 3888, Australia.

C Environmental and Conservation Sciences, Murdoch University, Murdoch, WA 6150, Australia.

* Correspondence to: lauren.white@delwp.vic.gov.au

Handling Editor: Jonathan Webb

Wildlife Research 51, WR23095 https://doi.org/10.1071/WR23095
Submitted: 2 August 2023  Accepted: 19 December 2023  Published: 19 January 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Accurate monitoring data on species presence and distribution are crucial for effective conservation management. Environmental DNA (eDNA)-based techniques, in which species are detected from trace amounts of DNA found throughout the environment, are promising tools that may complement traditional monitoring methods and improve detection. However, imperfect detection is a feature of all survey methods that should be properly assessed so that the probability of detecting a target species’ DNA at a site where it is present (i.e. the sensitivity of the method) can be determined. The spot-tailed quoll (Dasyurus maculatus), a carnivorous marsupial found in eastern Australia, is a difficult species to detect as it is rare and has large home ranges, often in remote and difficult to access habitat.

Aims

In this study, we aimed to evaluate the feasibility of using eDNA soil analysis as a viable alternative or complement to traditional monitoring techniques for detecting spot-tailed quoll.

Methods

We developed a species-specific assay and validated it using synthetic oligos, tissue samples and soil collected from a captive quoll enclosure. We then assessed the assay on natural environment soil samples taken from the Snowy River region from communal quoll defecation sites (latrines) and from broader quoll habitat. We used amplification success data to model the concentration of quoll DNA in soil from different site types and calculate the sensitivity of our assay.

Key results

Sensitivity was highest at latrine sites, but decreased sharply when sampling just 1 m away. In non-latrine habitat, the positive amplification rate was too low to allow for meaningful statistical analyses, suggesting that a prohibitively large number of samples would need to be analysed for detection probabilities to be adequate for routine monitoring programs.

Conclusions

Overall, we found that low sensitivity was driven by the low concentration of spot-tailed quoll DNA at many of the surveyed sites.

Implications

Given that quoll latrines can usually be identified from the accumulation of scats, and scats themselves can be sampled for DNA, we suggest that eDNA analysis of soil is unlikely to offer improvements over current spot-tailed quoll monitoring methods.

Keywords: Dasyurus maculatus, eDNA, qPCR, rare species, sedaDNA, sediment, sensitivity, targeted detection.

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