Habitat loss and fragmentation: The clearing of land for human activities such as agriculture, development, and mining has resulted in the destruction and fragmentation of quokka habitat. This loss and fragmentation limit their movement, access to food and shelter, and reduce the overall population size.
Disease: Quokkas are susceptible to various diseases and parasites, both introduced and native. Diseases such as quokka paralysis, caused by a tick-borne virus, and respiratory infections have caused population declines.
Human-animal interactions: Inappropriate interactions with humans can also pose risks to quokkas. Feeding quokkas human food, for example, can lead to health issues and alter their natural feeding behaviors.
Limited genetic diversity: The quokka population on Rottnest Island has relatively low genetic diversity, making them more vulnerable to the impacts of diseases, environmental changes, and other stressors.
Climate change: Changing climatic conditions, such as rising sea levels and altered rainfall patterns, may also impact quokka habitat and overall survival.