ABC Catalyst program on Hunting - Expert might not have read the recent research papers

http://www.abc.net.au/catalyst/stories/3852511.htm

ON TV IN SEPTEMBER 2013
Dr Euan Ritchie
As an example, if you kill foxes, cats will increase because foxes actually are very effective control method for cats, and so when you're managing species, you have to actually think of all the species in that system, and you actually have to manage them at the same time, and it's very difficult to do that as a hunter. It's very difficult to go in there and say, 'Let's shoot pigs, foxes, cats, all these species at the same time.'

BUT RESEARCH PUBLISHED IN JULY 2013

http://www.northernstar.com.au/news/feral-cat-goanna-dingo/1957993/

THE culling of dingoes in Australia to protect livestock does not open the way for other predators to take their place, new research found.

The research results have been published in BioMed Central's open access journal Frontiers in Zoology by the Invasive Animals CRC in Australia.

The research found that while culling dingoes and red foxes are temporarily suppressed, feral cats and goannas are not affected.

Invasive Animals CRC and Biosecurity Queensland's Benjamin Allen, who led the study, said the results suggested planning of culls around calving time to save livestock from attacks should not harm other animals in the ecosystem.
Mr Allen said top predators like dingoes were often culled to protect livestock.
It had been suggested this practice could lead to increased numbers of next level predators such as red foxes, feral cats and goannas.