In a changing climate, securing the future of the Flinders Ranges Purple-spotted Gudgeon

Why we need to act

The wirti udla varri is a rare and fascinating freshwater fish that until recent translocations in 2021, were found only in two springs in the Northern Flinders Ranges, a region of immense ecological and cultural significance. Protecting this species is important for maintaining biodiversity in these unique ecosystems, especially as climate change exacerbates environmental challenges. This project represents a collaborative effort to safeguard the future of this species through science-based interventions and sustainable management strategies.

Threats to the species

The Flinders Ranges Purple-spotted Gudgeon faces a range of threats that have pushed it to the brink of extinction in parts of its former range. Habitat loss and degradation – particularly the drying of natural springs and creeks due to water extraction, agriculture, and climate change – pose the greatest risks. Introduced species, such as predatory fish and invasive plants, further disrupt the fragile ecosystems the gudgeon depends on. Fragmentation of populations also limits genetic diversity, making recovery even more challenging for this small but significant freshwater species.

Solution and approach

1. Population monitoring and genetic health assessment
   The first phase involves a detailed survey of two translocation sites established in 2021. This work, planned for February 2025, will estimate current population sizes and collect genetic samples to assess their diversity and resilience. Results from these analyses, expected by July 2025, will determine whether genetic supplementation (introducing individuals from other populations to increase genetic diversity) is necessary to enhance population health.

2. Responding to environmental challenges
   Recent flash floods along Bunyeroo Creek have severely impacted the population there, highlighting the species' vulnerability to climate change-driven extreme weather events. In response, the project aims to establish a second, more secure population in Wilpena Spring, within the Wilpena Pound Gap.

3. Habitat assessments and future translocations
   During 2025–26, detailed habitat assessments of Wilpena Spring will be conducted to confirm its suitability as a translocation site. If conditions are favourable, as expected, a translocation from the source population at Vulkathunha-Gammon Ranges National Park is planned for 2027.

Project partners and additional funding information

Creating Three Safer Havens 

A master project in collaboration with the Department for Environment and Water (DEW). 

The aim of the project is to continue to develop and create three unfenced safer havens for the reintroduction of eleven (11) threatened and culturally significant species across three (3) national parks whilst maintaining habitats, increasing climate resilience and ensuring populations are nationally recognised in semi-arid South Australia.