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Bats and birds get a boost from pest control

Media release: 23 December 2016

Bats and birds get a boost from pest control

Numbers of endangered bats and birds are up in the Kepler area of Fiordland National Park after aerial predator control this spring, recent monitoring has shown.

Following widespread beech seeding across Fiordland earlier this year and increasing rat numbers, the Department of Conservation (DOC) treated a 20,000 ha area of the Kepler Mountains with biodegradable 1080 as part of the Battle for Our Birds programme.

Monitoring of long-tailed bats in the Iris Burn valley of the Kepler Mountains this month recorded 57 female bats, up from 43 in 2015 and 32 in 2013 when the rare bat was first monitored at this site.

A whio/blue duck survey showed that duckling numbers in the Iris Burn had almost doubled from 16 in 2014 to 30 this year.

DOC Operations Manager for Fiordland, Greg Lind, said it was rewarding to see wildlife responding after the knock-down of rats, stoats and possums.

“It’s a great result to be seeing the steady increase of some of our rarest species such as long-tailed bats and whio.”

“Rangers are also encountering greater numbers of Fiordland tokoeka kiwi in their work, and trampers have been reporting seeing lots of kea, South Island robin, kākāriki, fantail and bellbird,” said Greg Lind.

Rodent monitoring following the September aerial 1080 operation in the Kepler area showed that rat tracking levels dropped from 22% in July to 2% in November. In comparison, rat tracking levels reached 70% over the same period in the nearby Murchison Mountains where aerial 1080 wasn’t used.

A rat tracking rate of more than 20% during the spring threatens rat-vulnerable forest bird species and bats that are breeding and raising young then.

Prior to 2010, rats and possums were controlled over less than 0.5% of Fiordland National Park. DOC’s Battle for Our Birds campaign saw this increase to 7% in 2014 and to 8.5% in 2016. Fiordland sites under the programme included the Waitutu forest, Clinton valley, Arthur valley, Eglinton valley and areas of the Kepler Mountains.

This year’s Battle for our Birds programme will cover more than 800,000 ha across New Zealand to protect our most vulnerable populations of native species. Use of 1080 applied by air is backed up by ground control using methods like traps and bait stations over a further 70,000 hectares.


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