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Trophic dynamics of the pelagic ecosystem in the Western Mediterranean Sea

AutorAlbo Puigserver, Marta ; Navarro, Joan ; Coll, Marta ; Layman, Graig A.; Palomera, Isabel
Fecha de publicación18-nov-2014
Citación2nd International Ocean Research Conference (2014)
ResumenMarine ecosystems in the Mediterranean Sea are fundamentally driven by their pelagic compartments. Moreover, some pelagic species such as anchovy and sardine species are highly commercial species. However, the knowledge gathered from them is frequently scarce, impairing our capabilities to correctly manage its marine resources. Integration of different quantitative and qualitative tools it is essential for a proper ecological management. Stable isotopes analysis has been widely used to quantitatively analyze the trophic structure and interactions within the communities. Nowadays, new statistical models allow going one step further analyzing general patterns of the community and compare them between different sampling periods. In this context, stable isotope-based Bayesian ellipses and community-wide metrics are used to investigate the seasonal changes in the trophic structure of the pelagic ecosystem of the Western Mediterranean Sea and the importance of the Small pelagic fish in the food-web. Trophic ecology was analyzed by determining the stable isotopes of carbon and nitrogen in adult individuals of thirteen species of fish and cephalopods collected throughout the year. Community-isotopic descriptors revealed a consistency in the structure and the high importance of small pelagic as main trophic resources for pelagic and demersal predators. We also found differences in the trophic niche and position between ecological similar species such some squids and medium pelagic fish. These results provided new insights in the trophic dynamics of the pelagic food webs. The application of this methodology with other ecosystem model approaches could provide more accurate information of the functioning of marine food webs, knowledge that is essential to move towards and ecosystem-based management of fisheries in the region
Descripción2nd International Ocean Research Conference, One planet one ocean, 17-21 November 2014, Barcelona, Spain
Versión del editorhttp://www.iocunesco-oneplanetoneocean.fnob.org/
URIhttp://hdl.handle.net/10261/125081
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