《科学》[Science]12年4月20日出版pdf全文

nero1981

4 v3 r9 D/ x  {- I/ J3 vCOVER A young polar bear (Ursus maritimus) on a piece of ice
6 D' v' z% K) g2 E( l4 Tthat is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears
9 p8 U3 w' J5 Y, C& P" z, l2 |0 Udepend on sea ice as a platform for hunting seals, but current melting and
: j( [7 Q/ ^0 }3 }retreat of sea ice is increasingly forcing them onto land. A recent study has
8 ^. w) m6 h) Z) R- V8 ~+ ?3 U4 V# tfound polar bears to be evolutionarily older and genetically more distinct than
1 u6 S) i5 p, F  k( Ywas previously thought. See page 344. Photo: 3 H( A& x$ Z* R7 Q6 W
Florian Schulz, www.visionsofthewild.com
) a# S$ E1 \' F* d[hide][/hide]

懵懂干细胞

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linlicau

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tpwang

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eley

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军医

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埋名埋姓

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lcxlorna

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