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Effect of digestion on the 13C and 15N of fish-gut contents

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Gut contents of sand goby Pomatoschistus minutus showed higher C and N isotope values than the food before consumption. This enrichment was more pronounced in the hindgut than in the foregut, probably because of preferential assimilation of 12C and 14N along the gastro-intestinal tract. The results indicated that the shift towards higher values in the alimentary canal occurs in the first 2 h after feeding.

Keywords: Pomatoschistus minutus; assimilation; carbon and nitrogen stable isotopes; stomach content analysis; trophic enrichment

Document Type: Research Article


Affiliations: 1: Department of Analytical Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium 2: Laboratory of Aquatic Ecology, Katholieke Universiteit Leuven, Ch. Deberiotstraat 32, B-3000 Leuven, Belgium

Publication date: January 1, 2008


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