Predator control

We’re dealing with a unique set of pests who have adapted to live in the harsh environments – stoats, rats and possums, plus hedgehogs, rabbits, Canada geese, hares, feral cats and black-backed gulls.

The project has extended trapping networks to give natives a chance to thrive without constant pressure from introduced predators.

Braided rivers

We’ve more than doubled DOC and Project River Recovery’s existing trapping network in the Tasman River valley and extended into the Godley, Macaulay and Cass. The trapping network now covers 60,000 ha – that’s over 80% of the kakī / black stilt’s range and also home to species like robust grasshoppers and tūturiwhatu/banded dotterel.

Predator control at Te Manahuna Aoraki Project

Trapping networks

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Predator control in the alpine zone of Malte Brun

Alpine zone

In the remote back country of Aoraki/Mount Cook National Park we’ve introduced trapping networks for the first time to protect natives like kea, tuke/rock wren and scree wētā.

Volunteer group Predator Free Aoraki help out by checking and maintaining traps in the lower reaches, while the Te Manahuna Aoraki Project team is responsible for new trapping networks in the Mistake Valley and Malte Brun sites.

Development sites

We know it’s not going to be easy to eliminate small mammal pests across the whole project area so we are running three multi-species pest elimination sites across different ecosystems to test potential methods.

Malte Brun

This extreme alpine 16,480ha site is surrounded by glaciers and mountains as high as 3200m. We are targeting feral cats, hares, possums and stoats, and testing how well natural barriers will work to stop reinvasion. It is an extreme alpine environment, which will test our team’s ability to work safely in challenging terrain with abundant kea populations. 

Mistake Valley

We’re targeting hedgehogs in this mountainous tussock and scree zone. The 5640ha alpine site includes conservation and private land, and is defended by mountain ranges and big scree fields. This site will allow us to test different tools to eliminate and detect hedgehogs at altitude and also prove that high mountains will prevent reinvasion.

Patersons Terrace

In this flat tussock dryland site, we are targeting rabbits, hares, hedgehogs and ferrets over 2600ha, including conservation and private land. It gives us the opportunity to test how best to eliminate rabbits and see the impact reducing rabbit numbers has on other predators. We’ll also explore whether the canal can be used as a barrier to stop them coming back.

 

Trapping totals

(as of 01/05/2022)

0

Hedgehogs

0

Stoats, weasels AND ferrets

0

RATS

0

FERAL CATS

Rabbit control

Rabbits are serious environmental pests across 135,000 ha of the project area, eating their way through native vegetation and agricultural land, and costing farmers millions in lost production and control. They are also a food source for feral cats, stoats and ferrets, so high rabbit numbers lead to high predator numbers, increasing the risk to native species.

Learning by doing

We’ve spent the first few years of the project ‘learning by doing’ with rabbit control.

In 2020/21 we successfully reduced rabbits to very low numbers at a high country site in the Godley using a combination of patch poisoning, day and night shooting, and thermal and night vision technology.

Now we are using the Paterson’s Terrace site to test the best methods to eliminate rabbits from a low country site. This site will also give us good information about what happens to predator numbers when you reduce their food source.

There are other rabbit control operations happening across the project area to protect native plants, animals and pasture. Some are co-ordinated by Te Manahuna Aoraki Project and funded through Toitū Te Whenua Land Information New Zealand (LINZ) Jobs for Nature funding. Others are being undertaken by DOC and landowners.

Rabbit advisory group

Ultimately we hope the 20-year project will either eliminate or bring rabbits down to very low numbers across the project area. We want to do this at the lowest cost, and in a way that can be maintained into the future.

A rabbit advisory group – made up of landowners, Environment Canterbury and representatives from Te Manahuna Aoraki Project – is bringing together local knowledge, and learnings from past and present control operations, to advise us on the best approaches to achieve this.

Photo courtesy Brian High

Historic rabbit footage

Filmed by Timaru videographer Brian High over many decades this is amazing historic footage of rabbits and the damage they do in the Mackenzie Basin.

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HISTORY OF RABBITS IN THE MACKENZIE BASIN

Read this story from our 2021 Annual Report about Andrew Simpson’s work controlling rabbits

Conservation dogs

New Zealand was the first country to use dogs for conservation as far back as the 1890s. We are using detections dogs alongside more conventional methods like trapping and night shooting as another tool to help remove pests like feral cats and hedgehogs.

Feral cat detection

Julius, is a mixed breed hunting dog certified as part of the Conservation Dog Programme. He is useful at finding those hard-to-find feral cats that are avoiding other methods of control.

Feral cats are wily, highly mobile, have large home ranges and are used to surviving in harsh conditions. When we get a trail camera sighting, Julius and his trainer Adriana Theobald can be brought in to respond while scents are still fresh.

Predator tracking dog Zach

Hedgehog detection

Two-year-old pig dog Zach has his interim certification with an aim to becoming New Zealand’s only certified hedgehog detection dog as part of DOC’s Conservation Dogs programme.

Zach began training in 2021. He is known as Professor Zachariah Q Wigglebottom for his tendency to wiggle his bottom with excitement when he finds a hedgehog.

Some hedgehogs are reluctant to interact with traps, so Zach will be used alongside live capture traps, kill traps and thermal hunting in an effort to determine the best methods for elminating hedgehogs.

Watch the video about conservation dogs in the Tasman Valley

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Canada geese

The key to controlling Canada geese is collaboration and land owners are leading this work to improve the state of the land and waterways.

Large flocks of Canada geese destroy the habitat of species like kakī/black stilt and crested grebe by polluting waterways and pasture with their droppings. They also impact farmers as they eat large amounts of pasture and crops – it’s estimated four or five geese will consume the same amount of grass as a sheep.

Landowners are leading control operations, and thousands of geese are humanely culled every season. The project, along with DOC and LINZ, is assisting farmers to run the culls in an efficient and co-ordinated way.

WHERE DO CANADA GEESE GO?

Learn about our research project into Canada geese movements.

Photo credits: Tom Smits, Inga Booiman, Sam Turner, Brad Snow, Brian High, Adriana Theobald, Robyn Janes, Simone Smits