Tiny song bird makes record migration — ScienceDaily

For the primary time, University of Guelph biologists have tracked an annual migration of as much as 20,000 kilometres made by the 12-gram blackpoll warbler, one of many quickest declining songbirds in North America.

The bird's trek between its breeding grounds within the central and western boreal forest of North America and its winter residence within the Amazon Basin -- one of many longest songbird migrations recorded -- is the subject of a brand new paper by a analysis group headed by U of G biologist Ryan Norris.

The paper was revealed immediately within the journal Ecology.

Describing a "great circle route" arcing throughout North America and together with a transoceanic flight to South America, the examine confirms an epic migration journey that scientists had lengthy suspected however not but proved.

In 2015, Norris and different biologists had been the primary to point out that blackpolls breeding within the Maritimes and New England full a continuous transoceanic flight of as much as three days and about 2,700 km alongside the japanese coast of the United States.

For this new examine, they regarded on the full migration of birds from central and western breeding populations.

"It's amazing," stated Norris, who labored on the examine with Hilary Cooke, affiliate conservation scientist with Wildlife Conservation Society Canada. "A bird weighing a couple of loonies travels from the western edge of North America all the way to the Amazon basin -- and, in between, traverses the Atlantic Ocean."

Other co-authors had been integrative biology professor Amy Newman and U of G grad college students Bradley Woodworth, Nikole Freeman and Alex Sutton, in addition to researchers from different universities, conservation teams and nationwide parks in Canada, the U.S. and Australia.

For the examine, researchers tracked birds outfitted with tiny geolocators from 4 boreal forest websites throughout northern Canada and Alaska.

Total southward migration took about 60 days on common over distances starting from 6,900 km for birds breeding in Churchill, Manitoba, to 10,700 km for populations on the western fringe of the continent in Nome, Alaska.

Blackpolls from Nome took 18 days to fly throughout North America to the Atlantic coast of the Carolinas. There, the birds spent nearly a month fattening as much as double their physique weight earlier than a continuous, 2 ½-day flight throughout open water to overwintering grounds in northern Colombia, Venezuela and Brazil.

They lined between 2,250 and three,400 km for that transoceanic hop.

Norris stated scientists had lengthy believed that blackpolls adopted the good circle route. Few of the birds have ever been discovered within the central or western States throughout fall migration.

He stated inhabitants numbers have fallen lately, maybe brought on by habitat loss and declines in insect prey associated to local weather change.

"To understand what's causing the decline, we need to know their full annual cycle," he stated.

In their paper, the researchers say local weather change might make excessive coastal climate occasions extra frequent and extra excessive, with unknown impacts on long-distance migratory birds.

"As a conservation scientist, what strikes me most is that in a single year a blackpoll warbler has to navigate 20,000 kilometres across land and ocean, facing risks of cat predation, storms and collisions with buildings and vehicles, all while trying to find islands of habitat to rest and refuel in our human-dominated landscapes,"stated Cooke. "In comparison, the boreal region of northern Canada provides safe and high-quality breeding habitat for this declining species. Protecting Canada's boreal forest is critical to saving this amazing songbird."

Norris is now working with biologists in Colombia trying on the overwintering portion of the warblers' life cycle. He stated studying whether or not populations from throughout the boreal forest overwinter individually or collectively in South American rainforests might assist enhance habitat administration alongside the migration route.