La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The trophic structure of the pipefish community (Pisces : Syngnathidae) from a western Mediterranean seagrass meadow based on stable isotope analysis
Auteurs :	S. Vizzini, Auteur ; A. Mazzola, Auteur
Type de document :	Article
Dans :	Estuaries (27(2) APR 2004)
Article en page(s) :	325-333
Résumé :	Syngnathus abaster and Syngnathus typhle (Pisces: Syngnathidae) from a dense Cymodocea nodosa meadow in the western Mediterranean Stagnone di Marsala (Italy) were studied using delta(13)C and delta(15)N analysis. Because of the presence of these two species in the same habitat and the specialized parental care by the male, the effect of species and sex on the isotopic composition was also studied to investigate the different feeding strategies between and within species. S. abaster and S. typhle exhibited enriched (13)C and (15)N values throughout the sampling period (mean +/-SE, delta(13)C = -10.5 +/- 1.8parts per thousand and -10.8 +/- 2.0parts per thousand, delta(15)N = 11.9 +/- 0.7parts per thousand and 10.6 +/- 1.0parts per thousand, respectively), suggesting that these species receive their energy mainly from mixed sources, particularly from sedimentary and particulate organic matter and the seagrass C nodosa as ultimate organic matter sources. ANOVA results demonstrated that the interaction between season, species, and sex significantly affected the isotopic composition of the pipefish (p

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