《科学》[Science]12年4月20日出版pdf全文

nero1981

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COVER A young polar bear (Ursus maritimus) on a piece of ice
3 H, u, p% j; z) Fthat is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears
5 q# e, n( q- j! C" Odepend on sea ice as a platform for hunting seals, but current melting and " x+ n' L8 F% ^
retreat of sea ice is increasingly forcing them onto land. A recent study has % \( B& \! ]3 L& b* K
found polar bears to be evolutionarily older and genetically more distinct than 7 k$ A; j; ~/ q$ }% l& S$ ]9 O
was previously thought. See page 344. Photo: $ ~9 \' v4 q) K  \' o! [: A. f
Florian Schulz, www.visionsofthewild.com
/ F4 K) e+ [: m+ |; t+ _3 V9 `[hide][/hide]

懵懂干细胞

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linlicau

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tpwang

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军医

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lcxlorna

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