Food web of a confined and anthropogenically affected coastal basin (the Mar Piccolo of Taranto) revealed by carbon and nitrogen stable isotopes analyses |
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Authors: | Lucia Bongiorni Federica Fiorentino Rocco Auriemma Fabrizio Bernardi Aubry Elisa Camatti Federica Camin Federica Nasi Marco Pansera Luca Ziller Jacques Grall |
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Affiliation: | 1.Istituto di Scienze Marine - Consiglio Nazionale delle Ricerche (ISMAR - CNR),Venezia,Italy;2.OGS (Istituto Nazionale di Oceanografia e Geofisica Sperimentale di Oceanografia),Trieste,Italy;3.Piattaforma Isotopi Stabili e Tracciabilità, Dipartimento Qualità Alimentare e Nutrizione, Fondazione E. Mach - Istituto Agrario di San Michele all’Adige,Trento,Italy;4.Observatoire, Séries Faune-Flore, UMS 3113 CNRS,Institut Universitaire Européen de la Mer, rue Dumont d’Urville,Plouzané,France |
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Abstract: | Carbon and nitrogen stable isotope analysis was used to examine the food web of the Mar Piccolo of Taranto, a coastal basin experiencing several anthropogenic impacts. Main food sources (algal detritus, seaweeds, particulate organic matter (POM) and sediment organic matter (SOM)) and benthic and pelagic consumers were collected during two contrasting seasons (June and April), at four sites distributed over two inlets, and characterized by different level of confinements, anthropogenic inputs and the presence of mussels farming. δ13C values of organic sources revealed an important contribution of POM to both planktonic and benthic pathways, as well as the influence of terrigenous inputs within both inlets, probably due to high seasonal land runoff. Although δ13C of both sources and consumers varied little between sampling sites and dates, δ15N spatial variability was higher and clearly reflected the organic enrichment in the second inlet as well as the uptake of anthropogenically derived material by benthic consumers. On the other hand, within the first inlet, the isotopic composition of consumers did not change in response to chemical contamination. However, the impact of polluted sediments near the Navy Arsenal in the first inlet was detectable at the level of the macrobenthic trophic structure, showing high dominance of motile, upper level consumers capable to face transient conditions and the reduction of the more resident deposit feeders. We therefore underline the great potential of matching stable isotope analysis with quantitative studies of community structure to assess the effects of multiple anthropogenic stressors. |
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