The most striking feature of Macquarie Island is the abundance of seabirds - Skuas, Shearwaters, Petrels, Prions, Albatross and of course, penguins - and the mammal fauna, all of which contribute to the nutrients in the soil. As the island has never been connected to an adjacent land mass, all flora and fauna has arrived there via long-distance oceanic dispersal. The flora shows taxonomic linkage to other subantarctic islands, the continents to the west and the islands to the south of New Zealand. Those plants which have managed to reach and successfully colonise the island exhibit a range of strategies for dissemination, reproduction and colonisation. The flora is rarely over 1 m. tall and although not particularly diverse has 45 vascular plant species and 91 species of moss as well as a rich population of liverwort and lichen. The flora is classified as growing in 5 main vegetation formations - grassland, herbfield, fen, bog and feldmark. Three plants - Azorella macquariensis, Puccinellia macquariensis and Corybas dienemus are endemic. Research continues to increase the number of species discovered and reclassified. In 1981 Macquarie Island became a restricted area and collection of scientific specimens requires a permit.
UPDATE 15 July, 2006
Since this item was first presented in 1999/2000 major changes have occurred to the island vegetation. Tasmanian University scientists, Justin Shaw and Jenny Scott, have written a paper showing the devastation by rabbits during the past six years when the last of the feral cats was eradicated. This element, plus the fact that rabbits have developed a natural resistance to myxomatosis, together with a climate change bringing warmer and drier winters, has enabled rabbits to breed successsfully all year round. Until recently, winter breeding was unsuccessful because the kittens would drown or females were too thin to breed.

Pest Eradication Update December 2007
Following the announcement that the Tasmanian and Australian Government would jointly fund the $24.6 million project, Tasmanian Parks & Wildlife Service have announced details of a seven-year project to rid the island of rabbits and rodents. The plan will involve helicopters dropping pellet baits targeting rabbits, rats and mice.

Work now under way includes construction of sixteen 5x5 metre plots protected by rabbit-proof fencing in a bid to protect specific locations of plant species that are under severe pressure. These will complement other existing scientific exclosure plots and prevent reintroduction as rabbits are removed.

Other actions include over-flight trials of helicopters and test baiting around penguin colonies to determine the response of the penguins to these activities.  Discussions have also been held with skilled dog trainers. Dogs will have a crucial role in the success of the project, following up the major baiting phase with on-ground hunting of surviving rabbits. The dogs will assist hunters and must be trained to focus on rabbits while avoiding non-target species, in particular native animals  More information about the eradication program can be found on Parks and Wildlife Service website www.parks.tas.gov.au

Update November, 2009
Azorella macquariensis.
In December 2008, a botanist from the Australian Antarctic Division first noticed that more than 90 per cent of this endemic cushion plant had died or is dying. There are a number of possible reasons for this die-back, the first being that the mean temperature has increased by more than half a degree over the past 50 years and the island is drying out and warming up. It is not so much a case of less rain than a change in rain and wind patterns.  This situation is affecting other sub-polar islands around the world.

Secondly there is the over-population of rabbits (since the eradication of feral cats - see above), which are causing a lot of physical damage.  Warmer temperatures has enabled the rabbit kittens to survive.  This problem should be ameliorated when the hunters and their specially trained dogs set their sights on the island in May 2010.

Thirdly a pathogen may be responsible for the plant's plight.

It is now considered to be critically endangered and the Antarctic Division has joined forces with the Royal Tasmanian Botanical Gardens in Hobart,  the DPIPWE (Dept of Primary Industries, Parks, Water and Environment),  Parks and Wildlife,  UTAS (University of Tasmania) and New Town Laboratory to try to save this cushion plant population.  Dr Jenni Whinan, senior ecologist of DPIPWE  fears any  increase in the die-back will bring a new set of environmental concerns including soil erosion, to the island.

Seeds of Azorella macquariensis have been collected for the Millenium Seed Bank and plant material has been set aside for tissue culture testing.  Twenty healthy plants, currently in quarantine, are also to be located at the botanical gardens in Hobart. Work is under way to try and mimic the sub-polar conditions the species needs to survive while in captivity."It is proving very difficult to give the plant the same conditions here", Dr Whinan said. "The lights have been changed in the quarantine area where the plants are housed, along with temperature, and fans are used to try and keep the plants, which normally grow in very exposed conditions, as healthy as we can."

Tight biosecurity measures are in place to ensure any pathogen does not leave the island and cause environmental problems in mainland Tasmania.

References and acknowledgements
1. Flora of Australia Volume 50, Oceanic Islands 2 . Australian Government
    Publishing Service, Canberra (1993).
2. Subantarctic Macquarie Island.   P M Selkirk, R D Seppelt and D R Selkirk,
    Cambridge University Press (1990).
3. J. R. Croft and M. M. Richardson - Australian National Botanic Gardens, Canberra

The Australian Plants Society would like to thank the Royal Tasmanian Botanical Gardens for their kind co-operation in the preparation of this item.

Special thanks to M. Fountain and M. Brown of  the Royal Tasmanian Botanical Gardens, Hobart