(Tables S1,2) Stable isotopes in muscle tissue of polar bears (Ursus maritimu...
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The relative contribution of regional contamination versus dietary differences to geographic variation in polar bear (Ursus maritimus) contaminant levels is unknown. Dietary...
目前尚不清楚区域污染与饮食差异对北极熊（Ursus maritimus）污染物水平地理变异的相对贡献。饮食……
