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BROCHURE RACK

Snowy owl tracking discovers unsuspected behaviour – Winter on the icepack

19/12/2008 08:40:50
birds/birds_september_2008/snowy_owl_tracking_gauthier

Tracking snowy owls in northern Canada. Credit Andrew Maher.

Satellite studies have revealed the secret behaviour of snowy owls.
Courtesy of Laval University, Quebec. - Edited by Lizzy Dening.

December 2008. "Six of the adult females that we followed in a satellite study spent most of last winter far out on the Arctic sea ice," says Quebec University doctoral student Jean-Francois Therrien. Therrien is working with Professor Gilles Gauthier as part of an International Polar Year (IPY) research project to better understand key indicator species of Canadian northern ecosystems, and their findings could lead to a rethink of the snowy owl's place in the North American ecosystem.

The behaviour of the owls is a mystery to scientists. Gilles Gauthier said "It is possible that the owls were preying on seabirds. Bird researchers at coastal field sites have observed snowy owls attacking eiders in winter. This hypothesis will be strengthened if we can match up the locations of our birds with the position of open water leads in the ice, as recorded by other satellite data."

The owls flew huge distances
The biologists are now keen to find out if Inuit seal hunters ever encounter the large white birds on the ice in winter darkness, as they are trying to grasp the range of the owls from year to year. Therrien stressed the unusual distances the birds migrated from where they were banded on their nesting grounds on Bylot Island, north of Baffin Island. He said "The satellite data showed just how dramatic the owl movements are. They flew huge distances. One owl went to Ellesmere Island, another flew straight to North Dakota and a third ended up on the eastern point of Newfoundland."

Snowy owl chicks. Credit Jean-Francois Therrien.

Snowy owl chicks. Credit Jean-Francois Therrien.

The researchers say that this winter should provide many southern Canadians with a good opportunity to see these magnificent birds.

"We had the largest abundance of lemmings in many years in our study area this past summer," said Gauthier. "The owls had no problems raising young, so we were informally predicting a strong outward movement of young owls this winter."

And judging by numerous newspaper reports and sightings, that prediction has already proved accurate.

Gauthier added "The support from IPY and Canada's Natural Sciences and Engineering Research Council (NSERC) and the advances in satellite technology have given a huge impetus to what promises to be a revolution in our understanding of this key northern species." The researchers believe that this knowledge can't come soon enough.

Satellite tracker fitted to a snowy owl. Credit Giles Gauthier.

Satellite tracker fitted to a snowy owl. Credit Giles Gauthier.

Read the comments about this article and leave your own comment

Tracking and rescuing Snowy Owls...

I am a FF and amateur photographer that works at Logan International Airport, Boston Massachusetts, and there are many snowy owls that view this area as similar to their familiar northern tundra.

Thankfully, we have an extraordinary man that has done some amazing work capturing and relocating snowy owls from Logan.

Norman Smith, of the Massachusetts Audubon Society has also done some great work with satellite tracking, marking, and keeping track of the snowys that venture into this area that can often be deadly to the snowys.

This was a year that we saw more snowy owls than the last several years. Thankfully, he was able to make a huge difference, with his work in relocating so many of the snowy owls away from the danger of the aircraft.

Posted by: Lisa Buchanan | 21 Apr 2009 22:55:58

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