Social and management issues
- Illegal trail building: A major challenge is the proliferation of illegal trails, which often have poor design and lead to the most significant environmental impacts.
- User conflict: There are conflicts with other users, such as walkers, and sometimes even among different mountain biking groups regarding trail access and design.
- Management and enforcement: Land managers face challenges in balancing the demand for recreational use with conservation goals, including monitoring and managing both formal and informal trail networks.
Environmental impacts
- Soil erosion and vegetation loss: Trail construction can lead to significant soil erosion and the loss of trees, undergrowth, and other vegetation, especially from informal trails.
- Habitat fragmentation: Trails can fragment forest habitats, creating barriers for wildlife and altering ecosystem dynamics.
Wildlife disruption: Trails can stress and displace wildlife, particularly during sensitive times like breeding season. Machine noise during trail construction, upkeep, and biking can negatively impact endangered species like koalas, powerful owls, and wedge-tailed eagles, as well as small mammals, reptiles, and invertebrates that are less able to evade the swift approach of mountain bikers. They can also create pathways for invasive predators like foxes and cats to access sensitive areas. - Invasive species: Trails can facilitate the spread of invasive weeds and diseases, such as the fungus Phytophthora cinnamomi, which can cause permanent damage to ecosystems.
- Damage to sensitive sites: Unauthorised trails can damage or destroy ecologically or culturally significant sites. Despite steep gullies being crucial for protecting against fires and serving as “refugia” for flora and animals, they are often damaged and disturbed during mountain bike activities.