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Título : Global trophic ecology of yellowfin, bigeye, and albacore tunas: Understanding predation on micronekton communities at ocean-basin scales
Autor : Duffy, Leanne M.; Kuhner, Petra M.; Pethybridge, Heidi R.; Olson, Robert J.; Logan, John M.; Goni, Nicolas; Allain, Valerie; Staudinger, Michelle D.; Choy, C. Anela; Hobday, Alistair J.; Galvan-Magana, Felipe; Potier, Michel; Menard, Frederic; Young, Jock W.; Abecassis, Melanie; Romanov, Evgeny
Citación : DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 2017, 140, 55-73
Resumen : Predator-prey interactions for three commercially valuable tuna species: yellowfin (Thunnus albacares), bigeye (T. obesus), and albacore (T. alalunga), collected over a 40-year period from the Pacific, Indian, and Atlantic Oceans, were used to quantitatively assess broad, macro-scale trophic patterns in pelagic ecosystems. Analysis of over 14,000 tuna stomachs, using a modified classification tree approach, revealed for the first time the global expanse of pelagic predatory fish diet and global patterns of micronekton diversity. Ommastrephid squids were consistently one of the top prey groups by weight across all tuna species and in most ocean bodies. Interspecific differences in prey were apparent, with epipelagic scombrid and mesopelagic paralepidid fishes globally important for yellowfin and bigeye tunas, respectively, while vertically-migrating euphausiid crustaceans were important for albacore tuna in the Atlantic and Pacific Oceans. Diet diversity showed global and regional patterns among tuna species. In the central and western Pacific Ocean, characterized by low productivity, a high diversity of micronekton prey was detected while low prey diversity was evident in highly productive coastal waters where upwelling occurs. Spatial patterns of diet diversity were most variable in yellowfin and bigeye tunas while a latitudinal diversity gradient was observed with lower diversity in temperate regions for albacore tuna. Sea-surface temperature was a reasonable predictor of the diets of yellowfin and bigeye tunas, whereas chlorophyll-a was the best environmental predictor of albacore diet. These results suggest that the ongoing expansion of warmer, less productive waters in the world's oceans may alter foraging opportunities for tunas due to regional changes in prey abundances and compositions.
Palabras clave : Meta-analysis; Food webs; Ecosystems; Inter-ocean comparison; Trophic relationships; Classification trees; Climate changes; Macroecology; MARINE TOP PREDATORS; EASTERN PACIFIC-OCEAN; WESTERN INDIAN-OCEAN; ARCHIVAL TAG DATA; CLIMATE-CHANGE; THUNNUS-OBESUS; NORTH-ATLANTIC; INTERANNUAL VARIABILITY; PROXIMATE-COMPOSITION; PELAGIC ECOSYSTEMS
Fecha de publicación : 2017
Editorial : PERGAMON-ELSEVIER SCIENCE LTD
Tipo de documento: Article; Proceedings Paper
Idioma: Inglés
DOI: 10.1016/j.dsr2.2017.03.003
URI : http://dspace.azti.es/handle/24689/449
ISSN : 0967-0645
E-ISSN: 1879-0100
Patrocinador: Pacific Islands Oceanic Fisheries Management Project
Global Environment Facility
Australian Government Overseas Aid Program (AusAid)
tenth European Development Fund
Government of Papua New Guinea
New Caledonian ZoNeCo programme
Joint Institute of Marine and Atmospheric Research JIMAR
National Oceanic and Atmospheric Administration NOAA (Hawaii Pelagic Fisheries Research Program)
Instituto Politecnico Nacional from fellowships `Comision de Operacion y Fomento de Actividades Academicas' (COFAA)
`Estimulos al Desempeno de los Investigadores' (EDI)
National Oceanic and Atmospheric Administration (NOAA) [NA16FM2840]
CSIRO
Ministry of Fisheries of the former USSR
Aparece en las tipos de publicación: Artículos científicos



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