Isotopic homogeneity of breath CO2 from fasting and berry-eating polar bears: implications for tracing reliance on terrestrial foods in a changing Arctic

Author： Hobson K. A.   Stirling I.   Andriashek D. S.  

Publisher： NRC Research Press

ISSN： 1480-3283

Source： Canadian Journal of Zoology, Vol.87, Iss.1, 2009-01, pp. : 50-55

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