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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Spatial variability of stable carbon and nitrogen isotope ratios in a Mediterranean coastal lagoon
Auteurs :	S. Vizzini, Auteur ; B. Savona, Auteur ; T. D. Chi, Auteur ; A. Mazzola, Auteur
Type de document :	Article
Dans :	Hydrobiologia (550 NOV 1 2005)
Article en page(s) :	73-82
Résumé :	Exploring the trophic pathway of organic matter within the Mauguio lagoon (southern France, western Mediterranean), we found spatial differences in the isotopic composition (both delta(13)C and delta(15)N values) of organic matter sources (primary producers, particulate and sedimentary organic matter), which were mirrored in the upper trophic levels (invertebrates and fish). On average, delta(13)C was heavier by about 1.5-27 parts per thousand in the location under marine influence than in the sites influenced by freshwater discharge. The opposite trend was found for delta(15)N, which attained maximum values in the north-central zone influenced by freshwater delivery. For both C and N stable isotope ratios, the highest spatial variability was found in organic matter sources (2-3 parts per thousand), while invertebrates and fish exhibited less variability (similar to 1-2 parts per thousand). The differences observed may be related to both anthropogenic (wastewater input) and natural (marine vs. terrestrial inputs) factors. Discharge of wastewater, which affects the innermost location, generally determines an increase in the relative abundance of (15)N. In addition, terrestrially derived nutrients and organic matter, which also affect the innermost location, are known to determine a shift towards (13)C-depleted values. Our results substantiate the finding that the analysis of carbon and nitrogen stable isotopes can help in elucidating origin and fate of organic matter in coastal lagoons, which are characterised by a great spatial variability and complexity.

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