Fourteen feral cats captured in the wild have been re-released to measure their predation on native animals.
The cats wear collars that track their whereabouts and activities through video, GPS and VHF beacons as part of the NESP TSR Hub’s Integrated management of feral herbivores and feral predators (Project 1.1).
The research, led by Dr Hugh McGregor from the University of Tasmania, seeks to understand how the hunting behaviour of feral cats changes post-calicivirus (when rabbit numbers suddenly fall), including by measuring the occurrence and impacts of pre-switching by cats.
There are long-term gains to native plants and animals resulting from the reduction in rabbit numbers through use of calicivirus (through improvements to vegetation as well as overall reductions in the densities of foxes and cats) but there may also be at least short-term detriment to some native animals.
“After calicivirus, the sudden scarcity of rabbit numbers could cause cats and foxes to ‘prey switch’ to native animals. In some circumstances, prey-switching could cause the local extirpation of a population of native species. For example, we think that the loss of some populations of rock-wallabies in the arid zone may have occurred because of prey-switching after the first calici virus release,” says Hugh.
Hugh aims to discover whether prey-switching occurs, and if so how it can be managed. He also aims to identify the threshold density of rabbits that results in cat densities with minimal impacts on native species.
“By describing the hunting behaviour, including the kill rates and prey choice of feral cats, we can make better calculations of the impacts of prey switching on native populations.
“We’ve been tracking the cats for a couple of months already, since July, and very early video footage is showing that the cats are hunting selectively around rabbit warrens and preferring rabbits as prey.
“When the footage shows a cat preying on a native animal, it can be quite confronting. The native animals are clearly unused to being hunted by such a predator.”
Image: feral farm cat, by Stavrolo
Karajarri Rangers are leading a Threatened Species Recovery Hub research project to investigate how different fire management approaches affect biodiversity. The first field trip took place in April this year, when a team of 16 rangers, support staff and scientists journeyed to the Edgar Ranges for eight days of wildlife monitoring. Hub researcher Sarah Legge worked with the rangers to compile this report from the field.
Cissy Gore-Birch is a member of the Threatened Species Recovery Hub’s steering committee and the Chair of its Indigenous Reference Group. The Indigenous Reference Group was established to assist hub leaders and project teams to strengthen the engagement and participation of Indigenous people in the hub’s activities and research projects. Cissy recently attended the Species of the Desert Festival on the Paruku Indigenous Protected Area, where she spoke about both threatened and culturally important species, and increasing the voice of Indigenous people in environmental policies and research.
Dr Sally Box, the Australian Government’s Threatened Species Commissioner, talks about the importance of working with Indigenous groups to conserve Australia’s threatened species.
Researchers from the Threatened Species Recovery Hub are calling on citizen scientists to help them learn more about Australia’s possums and gliders by recording sightings in a new, free app. Dr Rochelle Steven from the University of Queensland is passionate about Australia’s possums and gliders and believes people in the community can do a lot to help support conservation, especially in urban areas.
There are 27 different types of possums and gliders in Australia. They have a huge variety of sizes, shapes and appearances. We’ve compiled a profile on every species here. One quarter of our possums and gliders are listed as threatened under Australian environmental law. Help their conservation, be a citizen scientist: you can record sightings of possums from your local areas in the free 'CAUL Urban Wildlife App'.