DNA Helps Scientists ID Bird Species
February 21st, 2007An international team of scientists is assembling a barcoded genetic portrait of bird life in the United States and Canada - the prelude to a genetic portrait of all animal life on Earth.
Scientists have developed a new technique for species identification in the form of a DNA barcode, similar to ones used to identify consumer products in the supermarket, only a species barcode can identify unique animals or plants.
Based on DNA barcode identifiers, the scientists have discovered 15 new genetically distinct species, nearly indistinguishable to human eyes and ears and thus overlooked in centuries of bird studies.
The barcoders also logged the DNA attributes of 87 bat species in the South American country of Guyana and reveal six new species, each characterized by its unique genetic make-up.
“People have watched birds for so long we might think every different tweet has been heard, every different color form observed,” says Dr. Paul Hebert of the Biodiversity Institute of Ontario at Guelph University, who co-authored both the bird and bat papers. “However, there are a number of cases of deep genetic divergences within what are currently called single species.”
“Now, with the vast majority, 93-94 percent, of birds on the continent barcoded it’s hard to argue that barcoding might work for the easy stuff but miss the difficult cases of closely-related taxa,” Dr. Hebert said.
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