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Wednesday, January 14, 2009

The Most Dangerous Thing About Rabbits...

...is that they like to silflay. Here is an account of what happens when kitties are removed from the environment and rabbits are left to silflay without interruption:

(From Yahoo!)

Removing cats to protect birds backfires on island

BANGKOK, Thailand – It seemed like a good idea at the time: Remove all the feral cats from a famous Australian island to save the native seabirds.

But the decision to eradicate the felines from Macquarie island allowed the rabbit population to explode and, in turn, destroy much of its fragile vegetation that birds depend on for cover, researchers said Tuesday.

Removing the cats from Macquarie "caused environmental devastation" that will cost authorities 24 million Australian dollars ($16.2 million) to remedy, Dana Bergstrom of the Australian Antarctic Division and her colleagues wrote in the British Ecological Society's Journal of Applied Ecology.

"Our study shows that between 2000 and 2007, there has been widespread ecosystem devastation and decades of conservation effort compromised," Bergstrom said in a statement.

The unintended consequences of the cat-removal project show the dangers of meddling with an ecosystem — even with the best of intentions — without thinking long and hard, the study said.

"The lessons for conservation agencies globally is that interventions should be comprehensive, and include risk assessments to explicitly consider and plan for indirect effects, or face substantial subsequent costs," Bergstrom said.

Located about halfway between Australia and the Antarctic continent, Macquarie was designated a World Heritage site in 1997 as the world's only island composed entirely of oceanic crust. It is known for its wind-swept landscape, and about 3.5 million seabirds and 80,000 elephant seals arrive there each year to breed.

The cats, rabbits, rats and mice are all nonnative species to Macquarie, probably introduced in the past 100 years by passing ships. Authorities have struggled for decades to remove them.

The invader predators menaced the native seabirds, some of them threatened species. So in 1995, the Parks and Wildlife Service of Tasmania that manages Macquarie tried to undo the damage by removing most of the cats.

Several conservation groups including the International Union for Conservation of Nature and Birds Australia said the problem was not the original eradication effort itself — but that it didn't go far enough. They said the project should have taken aim at all the invasive mammals on the island at once.

"What was wrong was that the rabbits were not eradicated at the same time as the cats," University of Auckland Prof. Mick Clout, who also is a member of the Union's invasive species specialist group. "It would have been ideal if the cats and rabbits were eradicated at the same time, or the rabbits first and the cats subsequently."

Liz Wren, a spokeswoman for the Parks and Wildlife Service of Tasmania, said authorities were aware from the beginning that removing the feral cats would increase the rabbit population. But at the time, researchers argued it was worth the risk considering the damage the cats were doing to the seabird populations.

"The alternative was to accept the known and extensive impacts of cats and not do anything for fear of other unknown impacts," Wren said. "Since cats were eradicated, the grey petrel successfully bred on the island for the first time in a century and the recovery of Antarctic prions has continued since the eradication of feral cats."

Now, the parks service has a new plan to finish the job, using technology and poisons that weren't available a decade ago.

Wren said plans to eradicate both rabbits as well as rats and mice from the island will begin in 2010. Helicopters using global positioning systems will drop poisonous bait that targets all three pests. Later, teams will shoot, fumigate and trap the remaining rabbits, she said.

Some of the earlier critics are now behind this latest eradication effort, saying it should help the island's ecosystem fully recover because it would remove the last remaining invasive species.

"Without this action, there will be serious long-term consequences for the majestic seabirds which nest on the island including the four threatened albatross species, and for the health of the island ecosystem as a whole," said Dean Ingwersen, Bird Australia's threatened bird network coordinator.

"We believe that the process they are going to follow uses best practice for this type of work," Ingwersen said. "And that all possible ramifications have now been considered."

(emphasis added)

tsk tsk...

2 comments:

Man From U.N.C.L.E. said...

Cats are a necessity.

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