Sentences with phrase «brown bears split»

Nielsen estimates that polar and brown bears split from their common ancestor 479,000 to 343,000 years ago, when Arctic conditions were mild.

Not exact matches

Mandelson, the former business secretary and chief architect of New Labour, describes how he and other No 10 aides drew up plans — codenamed Operation Teddy Bear — to split the Treasury into two in an attempt to weaken Brown's challenge to Blair in 2003 when the prime minister agreed not to fight the following general election, only to renege on his promise.

Because their data consistently showed that black, brown and polar bears carry highly distinct Y chromosome lineages, the researchers also estimated the timing of the split between the male lineages of brown and polar bears.

Drawing on that data, Willerslev and his colleagues conclude that polar bears split off from brown bears between 343,000 and 479,000 years ago.

Like every other species that diverges — splits into two or more distinct species — brown bears and polar bears underwent a speciation event.

The exhibitions are: Born Losers, curated by Laura Brown; Her split body is a crack in our community (Bard), curated by Levi Easterbooks; Not Quite Verbatim, curated by Max Fields; The skin of the sounds, curated by Talia Heiman; So long ago it feels like a memory of someone else, curated by Andrew Hibbard; An unbound knot in the wind, curated by Alison Karasyk; To clear the gound of weeds, curated by Sabrina Maltese; Measures of Authority, curated by Selby Nimrod; Everything is going to be fine, curated by Thomas Patier; I have become direction, curated by Santiago Silva Daza; In and Out of Place, curated by Hannah Spears; Fashion Work, Fashion Workers, curated by Jeppe Ugelvig; L'impudeur, curated by Janique Préjet Vigier; More than mere jelly, curated by Amelia Wallin; and Counting the Waves, curated by Ruiyu Xu.

I also sought reactions from some polar bear specialists and biologists focused on DNA clues to when the species split from its brown bear kin.

Scientists believe that the brown bear lineage split over 300,000 years ago to form the polar bear (Ursus maritimus), theorizing that a group of early brown bears became isolated in colder regions and ultimately adapted to life on ice.

Analyses of an extended dataset of 39 mtDNA control - region sequence fragments from a number of carbon - dated brown bears (26) and modern polar bears, importantly including four from Svalbard, provided comparable, although slightly older (190 ky for the ABC / polar bear split), divergence time estimates (Fig.

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