Understanding light preferences of Procellariiformes

Cory's shearwater in the Y-maze exposed to red and blue light. Photo: E Atchoi.

A novel paper investigates the behavioural preferences of both fledgling and adult Cory’s shearwaters (Calonectris borealis) to different light stimuli and evaluates this behaviour against the observed vulnerability to light that young shearwaters display. Using a Y-maze experiment, researchers found that both age groups preferred darkness and red light over blue or white light, suggesting that shorter-wavelength light disrupts their navigation. Fledglings, in particular, showed slower reactions and signs of disorientation when exposed to artificial light, which supports the observation that the majority of rescued birds affected by light are fledglings. Adults, while also avoiding bright lights, reacted more quickly, likely due to their experience, navigating in different types of environments, including urban lit areas. Both groups behaviour suggests that shorter-wavelength light, like blue and white LEDs, is particularly disruptive, possibly interfering with the birds' ability to navigate. These findings highlight the importance of reducing artificial light pollution in coastal regions. Shifting to longer-wavelength lighting and minimizing unnecessary outdoor illumination could help protect seabirds during their critical fledging period.
More info at:
Atchoi E, et al. 2024. Do seabirds dream of artificial lights? Understanding light preferences of Procellariiformes. Journal of Experimental Biology
This paper is highlighted in "Blue and white light pollution is disastrous for Cory's shearwater fledglings" by Kathryn Knight in  INSIDE JEB. 

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