Eutrophication in a semi-desert coastal ecosystem promotes increases in N and C isotopic signatures and changes in primary sources. (April 2019)

• Record Type: Journal Article
• Authors: Becherucci, Maria Eugenia; Alvarez, Maria Fernanda; Iribarne, Oscar; Martinetto, Paulina
• Is Part Of: Marine environmental research. Volume 146(2019)
• Page Start: 71
• Page End: 79
• Publication Date: 2019-04
• Subjects: Coastal zone -- Anthropogenic nutrient enrichment -- Stable isotopes -- Food web -- Primary sources -- Patagonia Argentina; Marine pollution -- Environmental aspects -- Periodicals; Marine ecology -- Periodicals; Mer -- Pollution -- Aspect de l'environnement -- Périodiques; Écologie marine -- Périodiques; Electronic journals; 577.705
• DOI: 10.1016/j.marenvres.2019.03.004
• Languages: English
• ISSNs: 0141-1136

Abstract

Abstract: Using C and N isotopic signatures of food web components, we evaluated the land-marine coupling through nutrient flows and the likely changes in the food web structure in tidal channels with contrasting anthropogenic nutrient inputs at a semi desert-macrotidal coastal system (northern Argentine Patagonia). The results showed an increase in the δ 13 C signatures of primary producers and in the δ 15 N signatures in all levels of the benthic food web, from primary producers to predators, with possible changes in the relative contribution of primary food sources for consumer in the tidal channel with high anthropogenic N input. This is an example on the extent of the distribution of anthropogenic N into natural systems, flowing through the food web from terrestrial origin to coastal marine components. Highlights: Stable isotopes analysis shows that anthropogenic N input is incorporated into food webs. δ 13 C and δ 15 N signatures of primary producers (PP) increase with eutrophication. δ 15 N signature of consumers increases with eutrophication. Eutrophication likely promote changes in the food web structure. Anthropogenic N from terrestrial origin flowed to coastal marine components.