The National Light Pollution Guidelines for Wildlife issued by the Australian Department of Climate Change, Energy, the Environment and Water present a detailed framework for assessing and managing the impact of artificial light on wildlife. The guidelines recognize natural darkness as a conservation value and respond to the increasing global prevalence of artificial light, which is shown to disrupt wildlife behavior, physiology, and ecological processes. The document outlines how artificial light affects species differently depending on their biology, habitat, and sensitivity to light wavelengths. It emphasizes that prescriptive limits are not feasible due to variability in species responses and environmental conditions. Instead, it promotes an outcomes-based approach supported by best practice lighting design and environmental impact assessments (EIA). The guidelines are structured around key components: understanding how wildlife perceives light, applying principles of lighting design to minimize ecological disruption, and implementing a five-step EIA process. This process includes describing project lighting, identifying affected species and habitats, assessing risk, developing a light management plan, and conducting ongoing monitoring and review. Species-specific appendices provide tailored guidance for marine turtles, seabirds, migratory shorebirds, bats, terrestrial mammals, and ecological communities. Each section details conservation status, distribution, behavioral impacts, and mitigation strategies. For example, marine turtles are affected by light up to 18 km away, and fledgling seabirds may be grounded by coastal lighting. Mitigation measures include shielding lights, using long-wavelength lighting, and managing light timing and intensity. The document also addresses the indirect effects of artificial light, such as changes in prey availability, increased predation, and habitat fragmentation. It discusses measurement techniques for biologically relevant light, including radiometric and photometric methods, and highlights the limitations of current light modeling tools. Case studies illustrate practical applications of the guidelines, demonstrating how infrastructure projects have balanced human safety with wildlife conservation. The guidelines stress the importance of qualified personnel in conducting assessments and implementing mitigation, and they advocate for adaptive management and continuous improvement.
Australia · 2023-05-01