We continue collecting data and samples for our project but there are already relevant studies that help us to understand the effect of anticoagulant rodenticides on predators and rodent populations. For instance, this one from New Zealand:
Murphy, E.C., Clapperton, B.K., Bradfield, P.M.F. & Speed, H.J. (1998). Effects of rat‐poisoning operations on abundance and diet of mustelids in New Zealand podocarp forests. New Zeal. J. Zool. 25, 315–328.
In this country stoats, weasels and ferrets were introduced to control the populations of rabbits. Unfortunately, small mustelids and other alien predators have contributed to the rarefaction of many native species in New Zealand. One of the main management tools to control these alien predators and rodents is the use of anticoagulant rodenticides and other poisoned baits to protect New Zealand’s biodiversity.
In the proposed study there were reductions of number of trapped stoats and thus assumed declines of population densities during the early use of anticoagulant rodenticides to kill rats. However there is a recovery in the number of trapped stoats soon after.
In our project we are also studying this population changes of small mustelids, not well known at our geographic context and system.
Here it’s me helping in the monitoring of alien predators during a stay that conducted at Landcare Research during my PhD.