Are snowy owls marine species?December 11th, 2008 - 3:29 pm ICT by IANS
Toronto, Dec 11 (IANS) Wildlife studies could prompt a radical re-think on how the snowy owl fits into the northern ecosystem. “Six of the adult females that we followed in a satellite study spent most of last winter far out on the Arctic sea ice,” said Universite Laval doctoral student Jean-Francois Therrien.
He is working with Gilles Gauthier, a professor as part of an International Polar Year (IPY) research project to better understand key indicator species of Canadian northern ecosystems.
The finding flabbergasted the biologists who are now curious to find out if Inuit seal hunters ever encounter the large white birds on the ice in winter darkness.
“As for what the birds were doing there, they were possibly preying on seabirds,” said Gauthier. “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,” he added.
The researchers find it intriguing that the top Arctic bird predator, like the top mammal - the polar bear, is also part of the marine ecosystem.
It was very surprising, said Therrien, how far the individual birds migrated from where they were banded on their nesting grounds on Bylot Island, north of Baffin Island, said a Université Laval release.
“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,” he said.
The researchers say that this winter should provide many southern Canadians with a better than normal opportunity to see the 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.”
Therrien made a presentation on Wednesday in Quebec City at the Arctic Change Conference.