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A Simple Flight Mill for the Study of Tethered Flight in Insects
Published on: December 10, 2015
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Pulsed artificial light at night alters moth flight behaviour.
Madeleine Fabusova1, Kevin J Gaston2, Jolyon Troscianko1
1Centre for Ecology & Conservation, University of Exeter, Penryn Campus, Penryn, TR10 9FE, UK.
Biology Letters
|November 12, 2024
Summary
Pulsed artificial light at night (pALAN) from vehicle headlights disrupts nocturnal moths. Cool LED headlights cause erratic flight, increasing risks, but warmer or RGB lights may reduce ecological harm.
Area of Science:
- Ecology
- Entomology
- Photobiology
Background:
- Nocturnal insects possess low-light vision but may struggle with rapid light changes.
- Vehicle headlights produce pulsed artificial light at night (pALAN), posing a threat to nocturnal wildlife.
- Moths, crucial pollinators and prey, are vulnerable to pALAN due to slow pupillary responses.
Purpose of the Study:
- To investigate the behavioral responses of nocturnal moths to different types of pulsed artificial light at night (pALAN).
- To determine if light color temperature and LED type influence moth behavior when exposed to pALAN.
- To assess the ecological implications of pALAN from vehicle headlights on moth populations.
Main Methods:
- Exposed 428 wild-caught moths (64 species) to four pALAN treatments: cool and warm phosphor-coated LEDs, and cool and warm RGB LEDs.
- Matched light treatments for color (correlated color temperature - CCT) and intensity to human vision.
- Assessed initial behavioral responses, focusing on flight patterns and flight-to-light reactions.
Main Results:
- Exposure to cool phosphor-coated LED light pulses significantly increased erratic flight and flight-to-light behaviors in moths.
- These detrimental behaviors heighten risks of vehicle collisions, predation, and excessive energy expenditure.
- A wide range of behavioral responses were observed across different moth species and light treatments.
Conclusions:
- Pulsed artificial light at night (pALAN) significantly impacts nocturnal moth behavior.
- Shifting away from high CCT (cool) phosphor-coated LED headlights towards lower CCT or RGB alternatives can mitigate harmful ecological effects.
- Reducing the ecological impact of pALAN offers potential benefits for road safety and insect conservation.
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