Birds Sing More Given Exposure to Artificial Lighting: Research Findings
A groundbreaking study, published last week in the journal Science, has provided definitive evidence that light pollution significantly affects the singing behaviour of over 500 bird species. The study, led by American scientists Brent Pease from Southern Illinois University in Carbondale and Neil Gilbert from Oklahoma State University in Stillwater, reveals that birds active during the day sing later into the night in areas with high levels of light pollution.
The impact of light pollution on these avian creatures varies depending on their specific characteristics, such as large eyes, open nesting, migratory behaviour, and large ranges during the breeding season. Bird species are particularly sensitive to changing light patterns, especially during the breeding season.
The findings of this study are especially relevant as more than 80% of the world's population lives under light-polluted skies. This growing issue has sparked an increasing number of investigations into light pollution, with over 5,500 studies conducted to date. Last year alone, 547 new references on light pollution were added, paving the way for further meta-studies.
These meta-studies will provide valuable insights not only on the impact of light pollution but also on possible ways to address it. The study reveals that, on average, light pollution prolongs vocal activity by 50 minutes. Other creatures, such as dung beetles, plants, and even humans, are also known to be affected by nighttime light sources.
This project originated from an attempt to engage undergraduates about birds by using a computer with an attached microphone and BirdWeather, which provides real-time data on bird species and their behaviour. The non-profit newsroom that published this article provides climate coverage free of charge and without advertising, relying on donations to support its operations, expand its reach, and maintain its editorial independence.
As the total radiance of Earth's artificially lit outdoor area grew by 2.2% per year from 2012 to 2016, it is clear that addressing light pollution is an urgent concern. The growing number of investigations into this issue will undoubtedly lead to a better understanding of its effects and potential solutions.
