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Feeding ecology of a demersal predator, the black anglerfish (Lophius budegassa Spinola, 1807) in the northwestern Mediterranean Sea

AuthorsLópez, Nieves
AdvisorPalomera, Isabel ; Navarro, Joan
Issue Date18-Sep-2014
PublisherUniversidad Autónoma de Barcelona
AbstractFeeding activity is an important tool to study the relationships of marine organisms and the energy transfer between trophic levels in marine communities. Knowledge of the diet composition lets us to preserve diversity and improve the management of the marine resources for fisheries. The aim of this study was study the trophic ecology of a commercial species, Lophius budegassa in the NW Mediterranean Sea, for this purpose we studied differences in diet between two sizes (size 1: <30 cm and size 2: ≥30 cm) and throughout the year. These differences are determined with two methodologies: stomach content analysis through various indexes (%FO, %N, %W, IRI and %IRI) and stable isotope analysis of nitrogen and carbon in muscle samples of our individuals to perform Bayesian isotopic mixing models with isotopic values of the potential preys. Variation in the diet of L. budegassa in the NW Mediterranean Sea was related to different factors as size and season. Our results show that L. budegassa is an opportunistic predator with preference by fishes and lesser extent to crustaceans, although small proportion of molluscs and echinoderms were also found in some stomachs. We found differences in the diet between sizes, in particular, size 2 individuals included more crustaceans and less fishes in the diet than size 1, this was confirmed with both methodologies studied. Regarding seasonal changes in diet, we not found differences between seasons, nor in stomach contents nor with isotopic mixing models, being in all the seasons more important fishes than crustaceans as preys.This study shows the importance to use complementary approaches for diet studies as isotopic mixing models in addition to traditional methodologies as stomach content analysis to improve knowledge about the food web and their fluxes
DescriptionTrabajo final presentado por Nieves López López para el Máster en Acuicultura de la Universitat Autònoma de Barcelona (UAB), realizado bajo la dirección del Dr. Joan Josep Navarro Bernabé y de la Dra. Isabel Palomera Laforga del Institut de Ciències del Mar (ICM-CSIC).-- 20 pages, 4 figures, 3 tables
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