On the lower W coast of the tiny island, well S of New Zealand, which is the southernmost bit of Australian territory.
Feral cats introduced to the island by whalers in the 19th century have had a devastating effect on the native seabird population, with an estimated 60,000 seabird death per year. In June 2000, the last of the nearly 2500 cats were culled in an effort to save the seabirds.
Although seabirds numbers began to rise initially, the removal of the cats caused an explosion in the number of rats and rabbits which together are causing widespread environmental damage. The rabbits too were an introduced species; by sealers in the 1800s as a food source and rapidly multiplied before numbers were reduced to about 10,000 in the early 1980s when myxomatosis was introduced. Rabbit numbers have now exploded to around 100,000 on the island.[4] The rodents feed on young chicks while rabbits nibbling on the grass layer has led to soil erosion and cliff collapses, destroying seabird nests. Large portions of the Macquarie Island bluffs are eroding as a result. In September 2006 a large landslip at Lusitania Bay, on the eastern side of the island, partially destroyed an important penguin breeding colony. Tasmania Parks and Wildlife Service attributed the landslip to a combination of heavy spring rains and severe erosion caused by rabbits.
There are currently plans to conduct the largest eradication program ever by mass baiting the island similar to an eradication program on New Zealand's Campbell Island, but there was an argument over which government, state or federal, will pay the estimated $24 million cost. On 4 June 2007 a media release by the Federal Minister for the Environment and Water Resources, Malcolm Turnbull, announced that the Australian and Tasmanian Governments had reached an agreement to jointly fund the eradication of rodent pests, including rabbits, to protect Macquarie Island's World Heritage values. It is expected to take up to seven years.
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