The Department of Climate Change, Energy, the Environment and Water will withdraw 24 expeditioners from Macquarie Island research station ahead of the Southern Ocean breeding season. The announcement, made 28 August 2026, responds to expert assessment of likely H5 avian influenza mortality among elephant seal populations. RSV Nuyina will retrieve personnel and essential cargo in late September or early October, leaving the station prepared for temporary closure.
H5 bird flu has not yet reached Macquarie Island. The withdrawal responds to risk assessment rather than confirmed disease
Expert projections predict significant mortality during spring breeding when thousands of elephant seal pups gather close to station buildings. Data from nearby Heard Island and McDonald Islands shows the scale of the threat. Elephant seals prove particularly susceptible to H5 bird flu, with observed pup mortality rates exceeding 90 per cent in some areas on those territories.
The Department frames the risk not primarily as direct human health threat, which it rates as low, but as psychological and social risk to personnel from prolonged proximity to mass wildlife mortality while operating in an extremely remote and challenging environment.
Active mitigation on the island is not feasible, which constrains how sub-Antarctic operators can respond
The island's remoteness and harsh conditions preclude active wildlife control measures that might reduce H5 bird flu impacts on native species. Macquarie Island exists in largely undisturbed condition, free of invasive species after previous eradication efforts on rabbits, rats and mice. That isolation makes intervention logistically unfeasible, so temporary staff withdrawal becomes the available protective measure.
The Australian Antarctic Division is developing monitoring options with a view to returning personnel in coming seasons, signalling this as temporary rather than permanent program change.
This decision establishes a new operational precedent for biosecurity in wildlife-rich zones
The move demonstrates that program security now accounts for psychological wellbeing of personnel alongside direct health risk. It signals that operators of sub-Antarctic stations should expect seasonal biosecurity protocols and potential closure windows based on wildlife disease forecasts. Ask any operator whether similar protocols apply to expeditions during spring breeding seasons at locations where large marine mammal populations congregate near infrastructure.