《科学》[Science]12年4月20日出版pdf全文

nero1981

; B) l: l: t, J- V2 m+ r, q) c5 [COVER A young polar bear (Ursus maritimus) on a piece of ice
' P2 B' e* F! H- k1 U7 Pthat is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears # M$ E' x/ N: [' l8 Z$ W
depend on sea ice as a platform for hunting seals, but current melting and ( B5 N+ g) X6 r2 P9 a0 \
retreat of sea ice is increasingly forcing them onto land. A recent study has
  K" z2 T4 A3 V9 @found polar bears to be evolutionarily older and genetically more distinct than
" r4 o1 `/ W! E" D7 Hwas previously thought. See page 344. Photo: ( k6 g3 @5 H; H( G2 P
Florian Schulz, www.visionsofthewild.com 6 P6 J6 A; B) l* V
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懵懂干细胞

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