Credit: Doug Gimesy
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Target-species testing
Not-for-profit
The challenge
Prior to this project, obtaining landscape scale data on platypuses was impossible to accumulate due to limitations of traditional monitoring techniques. Live-trapping and observational survey techniques can have poor sensitivity to detect platypuses at low abundance and are difficult to implement over large spatial scales.
Approach
Water sampling for eDNA was undertaken from September 2021 to January 2022 at 1,800 sites throughout all Victorian river basins. Samples were collected in duplicate using eDNA filter kits. Citizen scientists and collaborative organisations registered their interest for selected sites. By involving citizen scientists, this project was able to raise awareness of broader river health and conservation issues in the community.
A total of 3,898 eDNA samples were analysed for presence of platypus. EnviroDNA analysed water samples using real-time qPCR assays, using species-specific markers that target a small region of the mitochondrial DNA. Every water sample was processed using rigorous laboratory processes to ensure accuracy of results.
Results
Figure 1. Results shown from EnviroDNA report of GAPS eDNA surveys from 1611 sites across Victoria. Site samples are indicated by a circle with green = detection, yellow = possible detection, grey = not detected. Predicted status of platypuses across Victorian river basins is also shown; green shading = widespread, yellow shading = restricted, grey shading = absent/unknown.
To achieve effective conservation actions, the first step is understanding where vulnerable species are. The Great Australian Platypus Search is an incredible leap for conserving platypus populations in the wild. This survey has filled valuable gaps in knowledge of the status of platypuses at a landscape scale and findings will play an important role in informing targeted conservation management efforts. This data helps confirm their status in each of Victoria’s major river basins, including many areas where no recent data existed.
This project would not have been possible without the contribution of local citizen scientists and the following key project partners and donors:
- World Wild Fund for Nature-Australia (WWF-Australia)
- Victorian Department of Environment, Land, Water and Planning
- Parks Victoria
- Outback Academy Australia
- The Ross Trust
- Waterwatch Victoria
- Capricorn Foundation
- 2040
- Environment Education Victoria
- Planet Warrior Education
- Fouress Foundation
What's next?
Odonata Foundation announced another development to scale up this state-wide search into a national investigation named The Great Australian Wildlife Search. This will roll out eDNA surveys into other states, collecting biodiversity data. EnviroDNA is excited to partner with Odonata Foundation to continue critical eDNA-based surveys for detecting Australia’s unique fauna.