Mesedez, erabili identifikatzaile hau item hau aipatzeko edo estekatzeko: http://dspace.azti.es/handle/24689/248
Item honetako fitxategiak:
Ez dago item honi loturiko fitxategirik
Titulua: Feeding patterns of age-0 bluefin tuna in the western Mediterranean inferred from stomach-content and isotope analyses
Egilea: Medina, Antonio; Goni, Nicolas; Arrizabalaga, Haritz; Luis Varela, Jose
Zitazioa: MARINE ECOLOGY PROGRESS SERIES, 2015, 527, 193-204
Laburpena: Knowing how migratory pelagic predators use food web resources during early life stages is essential for understanding population dynamics and recruitment. Feeding habits of similar to 3 to 4 mo old Atlantic bluefin tuna (ABFT) Thunnus thynnus from 2 Mediterranean nearshore areas (Cartagena and Cambrils, Spain) showing distinct oceanographic features were investigated using stomach-content (SCA) and stable-isotope (SIA) analyses. SCA showed diet variability between areas and years; further correspondence analysis revealed that epipelagic fishes (primarily anchovy and sardine) constitute the staple diet of age-0 ABFT in Cambrils, whereas mesopelagic fishes (especially myctophids) and squid were consumed in significant amounts by ABFT in Cartagena. delta C-13 values differed significantly between tissues (white muscle and liver), areas and years (2009 and 2010), while delta N-15 values were not significantly different. In all cases, mean delta C-13 values were significantly higher in muscle than in liver, while differences in delta C-13 between locations and years were also observed in some instances. Estimations of trophic niche width using the antilogarithm of Shannon's entropy, exp(H), and from stable isotope Bayesian ellipses, SEA(c), indicated that niche width was generally larger in samples from Cambrils than in those from Cartagena. Moreover, SEA(c) analysis suggested that trophic niches were broader in 2010 than in 2009. Our results indicate a low degree of feeding specialisation and suggest that, like older classes, age-0 ABFT rely on a wide prey range, easily adapting their foraging behaviour to prey availability and distribution in the habitat. This research assesses the potential of using stable isotope techniques combined with SCA for the characterization of spatio-temporal variability in the diet of juvenile top predators.
Gako-hitzak: Atlantic bluefin tuna; Thunnus thynnus; Diet; Trophic ecology; Stomach-content analysis; Stable-isotope analysis; ANCHOVY ENGRAULIS-ENCRASICOLUS; SARDINE SARDINA-PILCHARDUS; THYNNUS L. 1758; THUNNUS-THYNNUS; STABLE-ISOTOPES; YELLOWFIN TUNA; ATLANTIC; DIET; SEA; HABITS
Gordailuaren-data: 2015
Argitalpen: INTER-RESEARCH
Dokumentu mota: Article
Hizkuntza: Ingelesa
DOI: 10.3354/meps11226
URI: http://dspace.azti.es/handle/24689/248
ISSN: 0171-8630
E-ISSN: 1616-1599
Babeslea: European Community \[212797]
Spanish Ministry of Science and Innovation \[CTM2011-29525-C04-01, CTM2011-27505]
Andalusian government \[RNM-02469]
Bildumetan azaltzen da:Artículos científicos



DSpaceko itemak copyright bidez babestuta daude, eskubide guztiak gordeta, baldin eta kontrakoa adierazten ez bada.