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      <marc:subfield code="a">"J. Great Lakes Res. 34: 143-152."</marc:subfield>
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      <marc:subfield code="a">"Fatty acids are potential trophic markers to trace feeding relationships in aquatic ecosystems primarily because lipid reserves of organisms broadly reflect dietary sources of lipids and can therefore provide information on the availability of key fatty acids in the food web"--Abstract, page 143.</marc:subfield>
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