JOURNAL OF PLANKTON RESEARCH | VOLUME 17 | NUMBER 10 | PAGES 1993-1997 | 1995
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Carbon isotopic variability in the composite pelagic foodweb of four oligotrophic lakes: feeding diversity or metabolic fractionations?
Department of Biology, McGill University 1250 Avenue Dr Penfield, Montreal, Quebec, H3A 1B1 Canada
Received on March 7, 1995; accepted on May 31, 1995
The
13C values of a simple pelagic foodweb (zooplankton, mysids, lake trout) composited from four oligotrophic Canadian Shield lakes showed no relationships to either animal trophic position (
15 or lipid content (C/N ratios). Carbon isotopic variability is therefore thought to be reflective of feeding diversity and not organismal metabolic fractionations due to either biochemical or trophic effects.