Widespread effects of lowering artificial nighttime light along a full migration route

Removal of all artificial light at night (ALAN) could allow up to 1123 additional successful juvenile Chinook salmon migrants per million migration attempts.

• Artificial light at night is a significant form of pollution affecting wildlife across various ecosystems.
• The study focused on the population-level effects of ALAN reduction on juvenile Chinook salmon during their migration.
• Predation vulnerability during oceanward migration was assessed as a key factor influenced by ALAN.
• The impact of ALAN reduction may provide small, yet meaningful benefits for salmon populations.
• The potential benefits of reducing ALAN are considered to be minor in comparison to the costs and controversies surrounding other habitat restoration efforts.

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