Scientists have found that artificial night lights cause most male songbirds to sing early in the morning and that helps them attract more females. Jessica Ilyse Smith reports why early morning bird trysts may not always be ideal.
GELLERMAN: Coming up - a city slicker with a green thumb. But first this note on emerging science from Jessica Ilyse Smith.
[SCIENCE NOTE THEME]
SMITH: Scientists have shed light on the love life of the early bird. Not only does it get the worm, but if it’s a male songbird that lives under a streetlight, it can attract more females.
To examine the link between artificial light and the breeding behavior of songbirds, researchers in Germany listened to five species sing. When streetlights were on at night, four out of five male birds began to sing a lot earlier, and they found mates a lot more easily. For example, male Blue Tits, or chickadees, who lurked under the lights, were twice as likely to attract females.
Scientists believe the male’s early morning serenade acts as a signal to females, indicating that they are strong and virile mates. But while artificial light may increase the male birds’ chance for romance, it can also deceive the females into thinking the early birds are genetically good partners when actually, they’re not. This could lead to less vigorous chicks and problems for the species.
Scientists also suggest another downside to these well-lit early morning trysts. The birds may be tired from their nocturnal workouts and vulnerable to predation. So from a bird’s eye view, nighttime might be the right time for mating - but it’s better in the dark. That’s this week’s note on emerging science, I’m Jessica Ilyse Smith.
[SCIENCE NOTE THEME]
Living on Earth wants to hear from you!
P.O. Box 990007
Boston, MA, USA 02199
Donate to Living on Earth!
Living on Earth is an independent media program and relies entirely on contributions from listeners and institutions supporting public service. Please donate now to preserve an independent environmental voice.
Major funding for Living on Earth is provided by the National Science Foundation.
Kendeda Fund, furthering the values that contribute to a healthy planet.
The Grantham Foundation for the Protection of the Environment: Committed to protecting and improving the health of the global environment.
Contribute to Living on Earth and receive, as our gift to you, an autographed copy of one of Mark Seth Lender's extraordinary hummingbird photographs. Follow the link to see Mark's current collection of photographs.