Dragonfly Environmental undertook non-lethal trapping of vertebrate pests within Wildlife Protection Areas throughout Warringah.  Work included on-ground control of pest animals, management of by-catch and data analysis and reporting.

Method & Technic:

• Aquatic Weed Treatment
• Bush Regeneration
• Revegetation
• Habitat Restratio

Project Outcomes:

Since the project began in 2019, significant progress has been made at VIVA Energy’s Clyde Terminal Hub in restoring and rehabilitating habitat for the Green and Golden Bell Frog (Litoria aurea). The construction of new breeding ponds was completed in 2019, providing critical new habitat to support the frog population, especially as original pond areas shrank due to drought.

Now, with the construction phase complete, a large portion of the site has entered the maintenance phase. Our team continues to focus on habitat management, including weed control, perimeter clearing to enhance light penetration, and careful monitoring of Acacia pubescens. Efforts to reduce the spread of invasive species such as Juncus acutus, Olea europaea, Ligustrum lucidum, Casuarina species, and Cortaderia selloana remain ongoing in both wetland and terrestrial areas.

We are proud of the work achieved so far and remain committed to making the site even better through our dedicated efforts now and into the future. Now we look to the skies — ready for the rain to help bring new life to the ponds and support the next chapter of this important restoration project.

Green and golden bell frog	Mosquitofish (Gambusia holbrooki)

The introduction of Mosquitofish (Gambusia holbrooki) in Australia was around the 1920’s, introduced by military and local councils to control mosquito populations. Brought in from North America the biological control for mosquitos was unsuccessful. However, they began a disturbance in the natural habitat of the GGBF and has decimated many of the amphibian population due to their aggressive behaviour preying on eggs and larvae of native fish and amphibians.

Provided a cost estimate for mangrove removal required to rehabilitate shorebird habitat on Kooragang Island.

Dragonfly Environmental identified key issues for the waterway, made recommendations to improve waterway health and native vegetation condition. In addition, actions were prioritised and a cost estimate provided.

Dragonfly Environmental carried out wetland assessment, vegetation mapping including mapping of the Endangered Ecological Community Eastern Suburbs Banksia Scrub community and stakeholder consultation and engagement and the writing of the Plans of Management and Plans of Operation.

Method & Technic:

• Aquatic Weed Treatment
• Bush Regeneration
• Revegetation

Project Outcomes:

Dragonfly Environmental was engaged to deliver long-term ecological restoration and stormwater management improvements at Coolibah Reserve and along Bardwell Creek and Bardwell Wetland. The project spans over 3.7 hectares and forms the final section of the Bardwell Creek Biodiversity Corridor, connecting to the broader Wolli Creek system.

Prior to 2020, our team undertook significant revegetation efforts along Bardwell Creek and Wetland, including the installation of 27,500 native plants—400 of which were advanced 8” aquatic species. These foundational works contributed to the establishment of riparian vegetation and set the stage for long-term ecological recovery and water quality improvement.

By 2023, Coolibah Reserve supported a mosaic of regenerating native bushland, remnant canopy trees, stormwater filtration zones, and revegetated riparian corridors. These areas collectively support two Endangered Ecological Communities (EECs): Swamp Oak Floodplain Forest and Swamp Sclerophyll Forest.

During the most recent contract period, our team carried out both primary and maintenance works across all five zones of the reserve. While routine sweeps targeted common weed incursions, primary works focused on degraded pockets, gradually improving site resilience while enhancing biodiversity and visual amenity. Zones 3 and 5 saw particularly notable improvements, with successful expansion of revegetated areas helping stabilize the creek line and prevent further erosion.

Weed control efforts significantly reduced the presence of high-priority species such as Tradescantia fluminensis and Anredera cordifolia, while regular management helped suppress annual herbaceous weeds. Despite these gains, areas impacted by nutrient-rich stormwater runoff remain a challenge and will benefit from ongoing restoration and support.

Revegetation works have played a key role in expanding the ecological corridor and improving the site’s function as a filter for urban runoff. Future work is recommended to continue in alignment with the current strategy, with increased planting and mulching to support newly established zones, improve visual presentation, and suppress invasive grasses.

This project stands as a strong example of how targeted revegetation, weed control, and habitat corridor restoration can meaningfully improve biodiversity, ecological function, and landscape aesthetics in urban environments.

Before	After

Before	After