Proteins Help Monarch Butterflies Find Mexico, Canada

Traci Carl in Mexico City
Associated Press
January 9, 2008

Scientists have discovered genetic information that helps explain how monarch butterflies find their way from Canada to winter nesting grounds in the mountains of Mexico.

Monarch butterflies have unique circadian clocks (see related story), which regulate daily events—like sleep and hunger—and help the insects use the sun as a compass, said Steven Reppert, a University of Massachusetts neurobiologist who led the study published online Tuesday in the PLoS Biology Journal.

The researchers genetically mapped the molecular underpinnings of the butterflies' circadian clocks and found cryptochrome proteins that are common in both insects and mammals.

Reppert believes these proteins enable the monarchs to navigate by using the sun's position in the sky.

(Related story: Moonlight Triggers Mass Coral "Romance" [October 22, 2007])

"A butterfly's brain is no bigger than the head of a pin, and yet it has this incredible capability. So we really want to understand that," Reppert said.

What It Means

When understood completely, the find might help shed light on the biological clocks of humans, and in turn aid research into everything from sleep disorders to depression.

Lincoln Brower, a monarch expert at the University of Florida and Sweet Briar College in Sweet Briar, Virginia, said the discovery was significant because it shows that "studying the monarch butterfly is producing crucial information about the nature of life."

The research was funded in part by grants from the National Institutes of Health and the Czech Republic's Ministry of Education, Youth, and Sports.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Free Email News Updates
Sign up for our Inside National Geographic newsletter. Every two weeks we'll send you our top stories and pictures (see sample).



NEWS FEEDS     After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed.   After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed.

Get our news delivered directly to your desktop—free.
How to Use XML or RSS

National Geographic Daily News To-Go

Listen to your favorite National Geographic news daily, anytime, anywhere from your mobile phone. No wires or syncing. Download Stitcher free today.
Click here to get 12 months of National Geographic Magazine for $15.