Studying the benefits of pest control for kea
DOC scientists have published research in the NZ Journal of Ecology (June 2018) on the effects of aerial 1080 in protecting nesting kea from predators.
This research was carried out from 2009-2012 on the South Island West Coast. It measured the nesting success of kea and compared this before and after aerial 1080 treatment and with an area where there was no predator control.
The results showed that kea nests were nine times more likely to survive and successfully produce chicks after aerial 1080 predator control.
Research also shows there is a risk of losing some kea to 1080 poisoning but in most cases this risk is easily offset by the improved nesting success after predator control.
Our scientists calculate that overall, the kea population is better off after 1080 treatment than without it. If predators are not controlled after a beech mast or seeding event, high stoat levels wipe out most nests and kill adult birds too.
Research in Kahurangi National Park
DOC has monitored kea nesting success in Kahurangi National Park since 2009.
In the 2015 and 2016 kea breeding seasons, on average 50% of monitored nests produced young kea. This followed aerial 1080 predator control in 2014 and 2016.
This is a big improvement on previous years without predator control in Kahurangi. Between 2009 and 2014 only 2% of nests were successful in areas without predator control.
DOC has tracked a total of 71 kea through 8 aerial 1080 operations in Kahurangi National Park (2009-2016) at four different sites (Mt Arthur, Wangapeka, Anatoki, and Oparara) and two birds were poisoned. The loss of these birds is unfortunate but would have been easily offset by the much better nesting success of the kea population in the park after predator control.
View larger graph (SVG, 35K)
Other monitoring results