Light pollution prolongs avian activity

Area of Science:

• Ecology
• Environmental Science
• Bioacoustics

Background:

• Light pollution disrupts natural light-dark cycles, affecting organismal timing.
• Previous research on light pollution and bird vocalization focused on individual species, lacking a broad synthesis.
• A comprehensive understanding of light pollution's impact across diverse species, locations, and seasons is needed.

Purpose of the Study:

• To synthesize the effects of light pollution on avian vocalization across a wide range of species, geographical areas, and seasons.
• To investigate how characteristics such as eye size, nesting behavior, migratory status, and range size influence species' responses to light pollution.
• To provide a global perspective on the impact of artificial light at night on bird communication.

Main Methods:

• Utilized a global acoustic dataset comprising over 60 million bird sound detections.
• Analyzed vocalization patterns from 583 diurnal bird species.
• Correlated vocal activity patterns with levels of light pollution in different landscapes.

Main Results:

• On average, light pollution was found to prolong daily vocal activity in birds by approximately 50 minutes.
• Species-specific responses varied, with stronger effects observed in birds possessing large eyes, nesting in open sites, exhibiting migratory behaviors, and having extensive geographical ranges.
• The impact of light pollution on vocalization was most pronounced during the avian breeding season.

Conclusions:

• Light pollution significantly alters bird vocalization timing on a global scale.
• Certain species traits predispose birds to greater disruption from artificial light at night.
• The fitness consequences of altered vocal activity require further investigation, highlighting the need for conservation efforts to mitigate light pollution.