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| A large male polar bear returns to feed on a fin whale carcass. Click to enlarge this image. Florian Schulz |
El origen de los osos polares (Ursus maritimus) como especie independiente tuvo lugar hace unos 600.000 años, según revela una investigación internacional en la que ha participado el Consejo Superior de Investigaciones Científicas (CSIC). Su historia evolutiva es, por lo tanto, cinco veces más antigua de lo que se creía hasta ahora, tal como refleja el artículo que ocupa la portada en la revista Science.
FUENTE | CSIC
Polar bears have been chilling on the ice far longer than is generally thought, new research suggests, and they probably interbred with brown bears at one point after the two species separated.
The new German study contradicts data from a study published last July in the journal Current Biology that suggested polar bears separated from brown bears 150,000 years ago. The new study analyzed the bears' mitochondrial DNA, a special "additional genome" that lives in the cell's energy factories and is passed down only from the mother. The new study concludes that the bears became separate species closer to 600,000 years.
More information: news discovery
FUENTE | CSIC
Polar bears have been chilling on the ice far longer than is generally thought, new research suggests, and they probably interbred with brown bears at one point after the two species separated.
The new German study contradicts data from a study published last July in the journal Current Biology that suggested polar bears separated from brown bears 150,000 years ago. The new study analyzed the bears' mitochondrial DNA, a special "additional genome" that lives in the cell's energy factories and is passed down only from the mother. The new study concludes that the bears became separate species closer to 600,000 years.
More information: news discovery
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