Non-target interference of possum control devices affecting the success of possum maintenance control

Abstract

Possum numbers have been significantly reduced in many regions of New Zealand. However, recent research has indicated unexpected consequences of possum control. For example, evidence has shown rat numbers can double in two years after possum control compared with non-control sites. Anecdotal reports from possum contractors suggest that these high rat numbers make possum maintenance control difficult and expensive. This research aimed to quantify the issue of high rat numbers and their effect on possum maintenance control. Also discussed is the the interference of possum control devices from other non-target species that may cause issues with possum maintenance control.