In response to the critically low occurrences of turtle nesting on Réunion Island, exacerbated by increasing coastal development, the preservation and expansion of suitable nesting sites have become imperative. Effective management of light pollution is essential to address this challenge. This study updates the monitoring of light pollution initiated in 2020 along the island's western coast.
Using illuminance intensity and illuminated length as primary indicators, we identify critical areas where artificial lighting must be managed. We analyze the distribution of lighting characteristics to establish effective, locally adapted recommendations. Beach rehabilitation efforts, including revegetalization and lighting management, should prioritize areas with nesting histories and low light pollution levels. In highly polluted areas and buffer zones, lighting management alone should be prioritized. Lights should be directed away from the beach and aimed downwards to minimize visibility, with a preference for warm colors and structural modifications like deflectors.
Actions already undertaken include raising awareness, fostering stakeholder collaboration, and promoting responsible lighting practices through the Nature&Nuit Charter. Public awareness campaigns should continue to be developed through diverse actions and by adopting a multidisciplinary approach that integrates the issue of light pollution from various aspects. Further measures could also involve light reduction programs and explore legal frameworks.
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