Feral species, such as the black rat, Indian myna, pig, fox, horse and coastal brown ant are present on the Island.

One ofthe biggest ecological threats posed by feral fauna is from the exotic cane toad, which outcompete native amphibians and are poisonous to native predators; alongside the feral cat, whose impact on smaller sized marsupials, birds and reptiles, is likely significant, as elsewhere in Australia.

Biosecurity is also a concern. Pandanus on the island were almost devastated by the Jamella leaf hopper, which is now being controlled by a wasp, Aphanomerus sp. The wasp, lays its eggs in the leaf-hopper's egg rafts where immature wasps eat the developing Jamella.

Fungal pathogens such as phytophthora, chytrid fungus which affects amphibians and Myrtle Rust are also an issue.

Myrtle rust can devastate large swathes of vegetation such as Eucalyptus, Melaleuca and Leptospermum species.

More information: Harvey, J.P. (2011). Landscape Weed Management Plan for Fraser Island. Invasive plant species management plan developed for the Fraser Island Natural Integrity Alliance (FINIA). University of the Sunshine Coast, Sippy Downs, QLD, Australia.