《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 1 X5 U# G0 M8 {( T' f! O2 u
that is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears ' v; J, m! c1 o9 x
depend on sea ice as a platform for hunting seals, but current melting and * O2 r0 T' V9 N5 T" w0 x2 F
retreat of sea ice is increasingly forcing them onto land. A recent study has
# w0 H6 J- f$ Q* f# jfound polar bears to be evolutionarily older and genetically more distinct than
! \6 y0 x! T2 f; _. I: {, Hwas previously thought. See page 344. Photo: * E0 w1 M: D& L0 j7 H
Florian Schulz, www.visionsofthewild.com # O* }$ U2 K; X+ a
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懵懂干细胞

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