《科学》[Science]12年4月20日出版pdf全文

nero1981

+ n3 R3 U; L# P7 K. MCOVER A young polar bear (Ursus maritimus) on a piece of ice
& {+ A/ `# @  P& @  Cthat is drifting in the Barents Sea, northeast of Svalbard, Norway. Polar bears 0 {9 p9 M$ Q' t" f* V
depend on sea ice as a platform for hunting seals, but current melting and # q, N  _+ H& Y
retreat of sea ice is increasingly forcing them onto land. A recent study has 8 \  q: L0 o% q' E
found polar bears to be evolutionarily older and genetically more distinct than
8 r/ K( W' q: W8 A6 l* E. t- swas previously thought. See page 344. Photo:
. I5 P" F, N- ~$ [  \" l5 K, x$ x% OFlorian Schulz, www.visionsofthewild.com
( [  s/ {3 C4 b9 g[hide][/hide]

懵懂干细胞

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tpwang

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