Did songbirds ‘borrow’ DNA to fuel migration?
TORONTO:
A common songbird may have acquired genes from fellow migrating birds
in order to travel greater distances, according to a new study.
While most birds either migrate or remain resident in one region, the Audubon's warbler, with habitat ranging from the Pacific Northwest to Mexico, exhibits different behaviours in different locations.
The northern populations breed and migrate south for the winter, while southern populations have a tendency to stay put all year long.
Evolutionary biologists have long been puzzled by research that indicates some Audubon's warblers share the same mitochondrial DNA (mtDNA) with myrtle warblers — a different species of songbird that migrates annually to the southeastern US, Central America and the Caribbean — even though they look dramatically different.
"Mitochondria are only passed down from mothers to their offspring," said David Toews, a PhD candidate in the University of British Columbia's department of zoology.
"So it's a very useful marker for differentiating species. In this case, finding two species of songbirds sharing the same mtDNA is very surprising, so we set out to find out why," Towes said.
While most birds either migrate or remain resident in one region, the Audubon's warbler, with habitat ranging from the Pacific Northwest to Mexico, exhibits different behaviours in different locations.
The northern populations breed and migrate south for the winter, while southern populations have a tendency to stay put all year long.
Evolutionary biologists have long been puzzled by research that indicates some Audubon's warblers share the same mitochondrial DNA (mtDNA) with myrtle warblers — a different species of songbird that migrates annually to the southeastern US, Central America and the Caribbean — even though they look dramatically different.
"Mitochondria are only passed down from mothers to their offspring," said David Toews, a PhD candidate in the University of British Columbia's department of zoology.
"So it's a very useful marker for differentiating species. In this case, finding two species of songbirds sharing the same mtDNA is very surprising, so we set out to find out why," Towes said.
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