Reinvasion by predators, of previously cleared areas, is one of the many challenges of becoming predator free. We can’t fence huge tracts of wilderness – but we can potentially make use of natural barriers. Possums, for example, may be reluctant to cross rivers. Possums may be reluctant to cross … [Read more...] about River tested as reinvasion obstacle to possums
Researchers Susan Walker, Joshua Kemp, Graeme Elliott, Corey Mosen and John Innes used 264,457 rodent tracking records collected quarterly from 23,709 tracking tunnel stations in forests across the length and breadth of New Zealand over an 18 year period from late 1999 to late 2016 to get a clearer … [Read more...] about Rats, mice and 264,457 tracking records shed light on rodent dynamics
The kiore is Aotearoa’s first, smallest and sometimes overlooked rat. It was also our first introduced mammal predator, arriving about 750 years ago with seafaring Polynesian explorers. Because of its arrival history, the kiore is considered both a threat to our native taonga and also a taonga … [Read more...] about Study looks at kiore when rival rat species absent
When you remove predators from islands and restore forest habitat, the expectation is that native forest birds will flourish and that the new ‘improved’ conditions may favour native birds over introduced species. But is that what happens Researchers John Ralph, Carol Ralph and Linda Long looked … [Read more...] about Tūī numbers treble in predator control study
In the past there’s been some uncertainty over the effectiveness of large-scale aerial 1080 operations to control mice and little is known about its effect on hedgehogs. Recent trail camera monitoring of mammal predators before and after a control operation in the Blue Mountains, West Otago, … [Read more...] about Blue Mountains study shows 1080 effective – even for hedgehogs, mice
Feral cats are nocturnal, elusive creatures and can cover a lot of ground. They can range up to 6 kilometres, making monitoring difficult. So how do you go about detecting them? Camera trap monitoring reveals a feral cat... Camera traps are a useful, non-invasive way to determine whether … [Read more...] about Catching feral cats on camera
When researchers tested a dual baiting regime on ship rats back in 2016-2017, they also made some interesting observations about possum behaviour in their study area. Could dual baiting be adapted to overcome the bait-shy behaviour of possum survivors too? Possums that survive an aerial 1080 … [Read more...] about Dual 1080 bait switch solves bait-shy possum issues
How far might young rats disperse if they find themselves in a place with few other rat competitors? It’s an important question, with implications for deciding what surveillance is needed to detect invasions in predator-free islands, sanctuaries and ultimately, large predator-free mainland … [Read more...] about Rats on the move – how far do they disperse?
Sanctuary fences keep predators out – but they’ve also become a popular ‘highway’ for ship rats travelling around the sanctuary exterior. Rats have discovered that the rolled steel hood (designed to stop mammals climbing over the fence), also makes a great way to get around, safely out of reach of … [Read more...] about What’s happening up in the hood?
Cautious rats – bait shy and trap shy – are a problem worldwide and researchers at the University of Liverpool, UK have been looking at other ways to attract rats into bait or trap boxes. So far the research has only been carried out on lab rats and still needs to be tested in the field. But the … [Read more...] about Liverpool researchers study rat audio lures