New alpine trapline lies in wait for predators
A new high alpine predator trapline is the final link in a 100km front protecting native wildlife between Wānaka and Glenorchy.
The installation of the 64 traps was also a symbolic joining of the Wānaka and Whakatipu basins in a bid to create the largest predator-free sanctuary on the New Zealand mainland.
Southern Lakes Sanctuary Trust hub co-ordinator Tom Reeves led a team of five workers installing the traps across about 13km from the Cascade Saddle to the Rees Saddle last week.
The traps were dropped into 10 locations by Aspiring Helicopters before the team spent two nights in the mountains installing each trap.
Reeves said the construction of the trapline was a goal when the trust was formed in 2021.
Since then the umbrella organisation had brought together six local groups representing 84 community groups, landowners and businesses to work on its predator-free plans.
The highest installed trap on the line sits at 1835m, making it one of the higher traplines in the country.
The traps targeted stoats, rats and other mustelids, and would actively help to protect kea and rock wren in their natural habitat, Reeves said.
Giant weta, alpine invertebrates and lizards would also benefit.
Part of the plan was to protect birds in the lower forested valleys, where traps were already installed, he said.
In summer, stoats would come over the mountain passes and re-invade valleys such as the West Matukituki, where long -tailed bats and robins and kākā lived, he said.
The trapline also provided protection for the Rees Valley, where the Department of Conservation is hoping to establish a population of vulnerable takahe.
“We’ve put several hundred traps into the Rees already, and this is all part of gearing up for that huge trans-relocation as well,” Reeves said.
The traps would be checked monthly, but not in winter due to snow and avalanche risk. “There’s not going to be stoats in winter anyway,” he said.
Maintaining the trapline will be a joint venture between the Matukituki Charitable Trust, servicing the traps on the Wānaka side, and the Routeburn Dart Wildlife Trust, which will be responsible for the Glenorchy side.
The Southern Lakes Sanctuary Trust was continuing to seek support from funders and volunteers to continue the work, Reeves said.
“Otherwise, a lot of those gains we’ve made over these last few years will disappear, so we do need a lot of help.“
The trust’s 30-year goal is to create a 660,000ha area free of introduced pests where indigenous fauna – including 35 endangered species – is able to thrive.