Ecologists have raised concerns that a probable large-scale starvation episode affecting flying fox populations along Australia's eastern seaboard could undermine the health of forest ecosystems across the region. Across the stretch of coastline running from New South Wales's Mid North Coast down through to Victoria, wildlife carers have been fielding a steady stream of callouts involving grey-headed flying foxes found underweight, unresponsive, or dead — a pattern that has built up over the past several months.
Reduced nectar availability on flowering trees — linked to dry weather conditions — is thought to have altered the bat species' foraging range, drawing individuals toward lower-elevation food sources. A period of food scarcity left flying fox colonies across New South Wales in weakened condition, with hundreds of animals giving birth to pups before full term.
Spread across eleven locations throughout the Hunter region, grey-headed flying fox populations include a nationally recorded grouping of around 40,000 animals roosting at Blackbutt Nature Reserve in Newcastle.
Nightly movement by flying foxes — carrying and depositing seeds across the landscape — underpins the health of forest ecosystems, with numerous plant species depending on these bats to complete their reproductive cycles. Travelling as far as 50 kilometres overnight, bats carry ingested seeds and deposit them across wide stretches of suitable habitat, with conservation professor Matt Hayward of the University of Newcastle noting that this movement helps transfer plant genetic material over those distances at a time when the pace of climate change makes such dispersal particularly important for forest regeneration.
Hayward noted that a reduction in nectar availability would send knock-on effects through broader ecosystems, pointing out that numerous Australian bird species and flying foxes depend on nectar as a food source, and that population numbers across those groups could drop noticeably as a result. Hayward further noted that with flying foxes already listed as a vulnerable species before the current drought, added pressures from land clearing and prolonged dry conditions are compounding the strain on their populations — a concern echoed by Hunter Wildlife, which has taken in a record volume of calls about dead or distressed bats, and by the broader ecological reality that many plant species depend on these animals for seed dispersal and pollination across fragmented landscapes.
Kerry Walker, a volunteer, noted that the situation calls for a prompt response, and went on to explain that a bat population decline would trigger a cascade of ecological consequences — eucalypts that rely on bats for pollination would face decline, and the bird and animal species that depend on those trees for habitat would follow.
Wildlife advocates have flagged that forest-dwelling species already under conservation pressure are contending with additional stressors, with the network of protected-status listings potentially at risk of erosion. On a separate matter, NSW Health recorded 43 people assessed for bat bites between 28 September and 10 October, and the agency subsequently issued an advisory addressing the possibility of Lyssavirus exposure. Of that total, the Hunter region accounted for eight.
Belonging to the rabies virus family, the illness spreads to people when an infected bat bites or scratches them, allowing the pathogen to enter the body through saliva and potentially trigger inflammation of the brain. Hunter New England Health physician David Durheim noted that people tend to want to assist injured wildlife, while stressing the need to understand the health risks involved — particularly with bats, which can carry disease and are currently facing food shortages that leave them visibly weakened, triggering a natural protective response in those who encounter them.
