《科学》[Science]12年4月20日出版pdf全文

nero1981

2 P3 s0 _# U. V: C) lCOVER A young polar bear (Ursus maritimus) on a piece of ice
) C# _( m6 X3 V% m8 Rthat is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears 7 |+ `. ]- p& ~1 [# `  L& X1 [, z
depend on sea ice as a platform for hunting seals, but current melting and $ w# D# D  Q6 `$ K  M0 T
retreat of sea ice is increasingly forcing them onto land. A recent study has & H. `9 o) Y# _% d5 W
found polar bears to be evolutionarily older and genetically more distinct than $ ~  h# V$ `0 `8 P6 D1 k, k
was previously thought. See page 344. Photo:
: i4 ?3 h  S* k1 X3 sFlorian Schulz, www.visionsofthewild.com / `7 ?9 a6 Q. }3 J! t
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懵懂干细胞

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