Pest Control Boosts Biodiversity
Updated: 2 days ago
Cave Wētā
One of our longest running projects has been working to protect and restore native biodiversity through targeted pest control efforts at Waterworks Reserve in Te Miro and, more recently, across key kahikatea forest fragments along the Waitoa River as part of our Connecting the Waitoa project.
Pest control has been carried out at Waterworks Reserve since 2018, with monitoring showing outstanding results. Using tracking tunnels to measure pest activity, recent monitoring conducted in August 2026 recorded zero rats at the reserve. 5% or less is the level deemed necessary for general bird population increase.
Pest control is often measured by the number of pests removed, but its true success is seen in the recovery of native biodiversity. At Piako Waihou Catchment Trust, we focus on what returns when invasive species are reduced. Tracking tunnels help monitor pests and provide valuable insight into insect activity. Monitoring has recorded insect presence in up to 90% of tunnels, showing a strong rebound in insect and invertebrate populations.
Insects and invertebrates play a vital role in healthy ecosystems by:
Pollinating native plants
Dispersing seeds
Breaking down organic matter
Providing an important food source for native birds
"This is an exceptional result," says Jude Tisdall, who coordinates the pest control programme. "We are seeing a rebound in insect and invertebrate numbers, which is a great indication of success. We have also had anecdotal evidence of kererū breeding and successfully fledging young at the reserve."
This success is thanks to our dedicated team of volunteers. Their ongoing commitment and hard work have helped significantly reduce rat and possum populations, enabling native plants and wildlife to thrive.
To celebrate these achievements and share the incredible biodiversity at Waterworks Reserve, we hope to host a community event in 2027 showcasing the range of insects and birdlife now being seen in the area.
To stay updated and be the first to hear about upcoming events, be sure to sign up for our newsletter. If you are interested in volunteering in our pest control project, we'd love to hear from you.
September 2026
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