Archives For 1080

Reducing the numbers of rats, stoats and possums was key to protecting endangered mohua and other native wildlife in the blue mountains area. This could be done through aerial 1080 pest control operations, but we wanted to know how effective this method was.

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Motueka rangers are thrilled with a 48% increase in whio numbers at an intensively managed site in Kahurangi National Park.

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Today we profile Planner, Terry Farrell, who is retiring from DOC today after dedicating his life and career to conservation over the last 47 years.

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Today’s photo shows a ferny glade in Iris Burn valley, Fiordland National Park.

Ferny Glade, Iris Burn Valley, Fiordland National Park. Day 3 of the Kepler Track.

DOC completed its ‘Battle for our Birds’ pest control operation in the Iris Burn valley on Monday.

Iris Burn was identified as one of the sites where rare native species, such as the critically endangered long-tailed bat, whio/blue duck, kākā, and Fiordland tokoeka kiwi, were under greatest threat from rising numbers of rats and stoats.

It is one of 22 confirmed ‘Battle for our Birds’ operations that will use aerially applied 1080 to knock down rising predator numbers fuelled by unusually heavy seeding in South Island beech forests.

Monitoring the effects of the pest control operation will be undertaken in coming weeks.

Photo: Phil Norton | CC BY-NC-ND 2.0.

Battle for our Birds - Beech mast 2014Recently we posted about the problem of increased predator numbers this year, due to predicted heavy beech forest seedfall. We also discussed what this could mean for our endangered native wildlife.

Today, we’re going to have a closer look at what we’re going to do about it…

How does DOC plan to protect at risk populations?

DOC routinely uses traps and other ground based techniques such as bait stations to control rats, stoats and possums. Traps and bait stations will continue to play a significant role in protecting threatened populations such as whio/blue duck in Tongariro, mōhua in the Eglinton valley and kiwi in the West Coast.

Whio. Photo: Matt Binns | CC BY 2.0

Our whio are nationally vulnerable, with less than 3,000 remaining

However research has shown that rapidly rising rat numbers produced by mast conditions can overwhelm trap networks. Ground based control on its own does not protect threatened bird and bat populations from these predator explosions.

The study of pest control techniques during two localised rat plagues in 2006 and 2009 through DOC’s Operation Ark multi-species protection programme showed that aerial 1080 treatment knocked down rat plagues to near zero levels where ground based methods were not effective on their own.

DOC is prepared to significantly expand its aerial 1080 operations in South Island beech forests in 2014/15 to respond to rising predator numbers.

Beech forest. Photo: Shannan Mortimer (CC BY-NC-SA 2.0).

South Island beech forest

How effective is 1080 in countering these predator threats?

Permanently eliminating rats and stoats is not currently feasible but research during past mast events has shown aerial 1080 to be the most cost effective tool for quickly knocking down predators over large areas and in difficult terrain.

Aerial 1080 has been shown to suppress rodent plagues to near zero density levels for up to five months. Tracking results indicated it can also kill more than 95% of stoats through secondary poisoning.

For example, aerial 1080 used in the Dart Valley in Fiordland during the rat plague in 2006 resulted in 80% of mōhua surviving whereas in uncontrolled areas only 10% survived.

At Ōkārito on the West Coast aerial 1080 timed to target rats after a beech mast in 2011 doubled the nesting success of kea. Kea pairs in the treated area produced about four chicks each whereas those in the untreated area produced only one due to stoats and possums preying on nests.

Young kea. Photo: Brent Barrett | CC BY-NC-ND 2.0

Aerial 1080 timed to target rats after a beech mast in 2011 doubled the nesting success of kea

As well as being fast and effective over wide areas, aerial 1080 operations cost approximately a third the cost of most ground based alternatives.

Get more information about the use of 1080 for pest control.

How much land managed by DOC is currently treated with aerial 1080?

Pest control cycles vary but over the past five years DOC has treated an average of about 140,000 hectares with aerial 1080 specifically to protect forest ecosystems and native species. This represents about 2% of the 8.7 million hectares of public conservation land which is managed by DOC.

TBfree New Zealand also carries out aerial 1080 operations over an approximate 300,000 additional hectares of public conservation land to protect dairy herds from possums infected with bovine tuberculosis.

Together these combined aerial 1080 programmes cover about 440,000 hectares or approximately about 5% of all public conservation land managed by DOC.

Giant snails/Powelliphanta. Photo: Kathryn and Stefan Marks | CC BY-NC-ND 2.0.

The Battle for our Birds doesn’t stop at protecting our birds, but other species such as our giant snails/Powelliphanta, which are among our most threatened invertebrates

How much more land is DOC preparing to treat with aerial 1080 as part of its Battle for our Birds beech mast response?

The exact scale of DOC’s aerial 1080 programme in the coming year will depend on whether predator populations reach levels which trigger a response but, if required, DOC is ready to increase its aerial 1080 protection in the South Island by about 500,000 hectares.

This together with TBfree New Zealand’s planned programme would result in a total of about a million hectares of public conservation land being treated with aerial 1080 in 2014/15 – about 12% of the land managed by DOC.

To increase its on-going protection for native species DOC is also committed to increasing its aerial 1080 programme by about 50,000 hectares a year for five years. This means DOC itself will be supporting the 2014 beech mast response by routinely treating about 400,000 hectares of public conservation with 1080 by 2019.

What is this expanded programme expected to cost and how will DOC pay for it?

This new Battle for our Birds programme is expected to cost about $21 million over five years. It is a priority project for DOC and will be funded out of the Department’s existing budget using efficiencies gained from improved pest control techniques and co-ordination of operations.

The heaviest beech forest seedfall in more than a decade is predicted this year. It is expected the increased seedfall will lead to an explosion in the numbers of rats, mice and stoats, who will turn to our native birds for food once the seeds disappear.

Predator plague cycle

Beech trees generally seed every four to five years but weather conditions over the last two summers—a cool summer followed by a warm one—appear to have triggered a bumper seed or “beech mast” event. Intense and widespread flowering was witnessed throughout North and South Island beech forests during spring and early summer, prompting the need for urgent action.

Past experience has shown that when a beech mast occurs, it leads to a dramatic rise in mice and rat populations, who feast on the plentiful seed all winter. To give you an idea of how quickly they can multiply, a single female rat can potentially produce 10 offspring every eight weeks—that’s a lot of rats!

An explosion in rodent numbers leads to a sharp rise in the number of stoats, which also pose a lethal threat to many species.

Rat eating Fantail chicks at nest. Photo © David Mudge. DOC use only.

Rat eating fantail chicks at nest

In spring, when the seed runs out, germinates and rots, these predators will then prey on native birds and their eggs, as well as other critically endangered critters such as native bats and snails.

This will put some of our most threatened species at risk of extinction including:

kākāriki karaka/orange-fronted parakeet
pekapeka/short-tailed bat
whio/blue duck
Powelliphanta snails

Kea and tākahe are also at risk of being preyed on by stoats.

Yellowhead/mōhua. Photo © Michael Eckstaedt. DOC use only.


Landcare Research estimates that 25 million native birds die through predation every year in New Zealand and the beech mast is expected to make the situation much worse. For example, there are only 200–400 wild orange-fronted parakeet left and during the beech mast that occurred in 2000, 85% of the southern population was wiped out due to the rat plague.

85% of the southern population of orange-fronted parakeets were wiped out

85% of the southern population of orange-fronted parakeets were wiped out during the beech mast that occurred in 2000

DOC staff will monitor the amount of seed produced this summer and seedfall in the autumn. Rat tracking will also take place in February and May.

DOC scientist Graeme Elliott says, “So far we’ve only been able to get a visual idea of the issue. We’ve seen lots of flowering during the spring, which caused huge clouds of pollen above the forests.

“The seeds are developing at the moment but in February we’ll be able to start counting them to get a better idea of the scale of the mast. We do this by shooting down branches at the top of the tree, where they’re exposed to the sun and produce the most seeds.

“The best indicator will be the rat tracking. If the numbers dramatically increase or are already high in February, we’ll know we’ve got a big problem to deal with.”

Last night the Minster of Conservation, Dr Nick Smith, announced DOC’s plans to respond and launched our largest-ever species protection programme called ‘Battle for our Birds’. We’ll talk about this in more detail over the coming weeks. For now, you can learn more about it on the DOC website:

Come behind the scenes and into the jobs, the challenges, the highlights, and the personalities of the people who work at the Department of Conservation (DOC).

Today we profile Dan O’Halloran, Ranger – Biodiversity.

Name:  Dan O’Halloran.

Position: Ranger Biodiversity Bay of Islands Area Office.

Dan getting down and dirty on Mauima.

Getting down and dirty on Mauimua (Lady Alice) a few years back

At work

Possum in a tree.

The possum is public enemy number one!

What kind of things do you do in your role? 

I trap, poison and monitor possums and supervise other staff, contractors, volunteers and commercial operators doing the same. I monitor & supervise our goat programme; assist with species work including snails (flax and kauri) and kiwi; assist with our weed programme and run the Puketi Weedbusters group.

I work with various community and iwi groups and liase with adjoining landowers, especially regarding pest control issues. As an Area Warranted Officer I am mainly involved with hunters and dog issues, as well as vandalism and rubbish dumping. I am a boat skipper, a Rural Fire Officer and staff Health and Safety rep.

What is the best part about your job? 

Two things, the first are those moments when you come across something – a creature or view appears, or you notice plant in fruit or flower – and you know that you would never have got that experience if it weren’t for the job you’re doing. The second is when that happens, along with the realisation, that what you are seeing is a direct result of work done by yourself, your colleagues or our conservation partners.

Four flax snails sitting on a rock under plants.

Flax snails on (the imaginatively named) Snail Rock

What was your highlight from the month just gone?

Seeing how well the pohutukawa are recovering in Pekapeka Bay.

The rule of 3…

3 loves 

  1.  My buddy Viv and all our friends and whanau.
  2. The natural world.
  3. Music.

3 pet peeves

  1. Vandals – why don’t you just get a life.
  2. Rubbish dumpers/litterers – ditto.
  3. Poorly informed people who think they have all the answers regarding pest control.

3 foods

  1. Rice.
  2. Plums.
  3. Dead creatures.

3 favourite places in New Zealand 

  1. The Whangaroa rohe, from Takou to Taemaro it is, like the man said, “a singular and beautifully romantic place”.
  2. Waikouaiti and East Otago, a wonderful place to grow up.
  3. Puketi Omahuta, if you’re talking biodiversity it’s the mother of all ngahere.
View from Whangaroa Harbour.

View from Whangaroa Harbour

Favourite movie , album, book  

  • Album – its a toss up between “Genius” the Warren Zevon greatest hits collection and “Enjoy Every Sandwich” where Dylan, Springsteen, Earle, and The Pixies etc. pay tribute to Zevon’s brillance, with an honourable mention for the Amnesty International  4 CD release “Chimes of Freedom” where 80 artists do Dylan covers. Some pretty amazing stuff, and if you buy it off the website your $40 goes to fighting injustice.
  • Movie – one of the best I’ve seen lately is “Sex & Drugs & Rock’n’Roll”, the Ian Dury biopic starring Andy Serkis.
  • Book – Jared Diamond’s “Guns Germs & Steel” or  Tim Flannery’s “The Future Eaters”.

Deep and meaningful…

What piece of advice would you tell your 18 year old self?

It dosen’t matter, I wouldn’t have taken any notice. At 18 I knew everthing and was totally bulletproof.

Who or what inspires you and why? 

My colleagues who keep on keeping on despite everything that gets thrown at them.

When you were a kid, what did you want to be when you grew up? 


And now, if you weren’t working at DOC, what would you want to be? 

A conservation worker for the NZ Native Forests Restoration Trust, Kiwi Foundation, Puketi Forest Trust or some other NGO.

What sustainability tip would you like to pass on? 

Switch things off – it’s that simple.

Which green behaviour would you like to adopt this year—at home? At work? 

Use less paper.

If you could be any New Zealand native species for a day, what would you be and why? 

If that day was 1200 or so years ago, I’d like to be a kauri specifically the giant Te Tangi O Te Tui so I could see what creatures roamed Puketi in its heyday, if thats not a real answer I’ll go for the Kahu because they’re cool (vote for the Kahu in the Forest & Bird poll – closes 10 October).

What piece of advice or message would you want to give to New Zealanders when it comes to conservation? 

People—get out there and do it, it’s not enough to talk the talk, you need to walk the walk.

Rata in flower on the Mokau ridge.

One of those moments – rata in flower on the Mokau ridge Puketi Omahuta

Please leave a comment – do you have any pieces of advice or messages that you would give to New Zealanders when it comes to conservation?