Duffy L. M. auteur aut IRD Kuhner P. M. auteur aut IRD Pethybridge H. R. auteur aut IRD Young J. W. auteur aut IRD Olson R. J. auteur aut IRD Logan J. M. auteur aut IRD Goni N. auteur aut IRD Romanov E. auteur aut IRD Allain V. auteur aut IRD Staudinger M. D. auteur aut IRD Abecassis M. auteur aut IRD Choy C. A. auteur aut IRD Hobday A. J. auteur aut IRD Simier Monique auteur aut IRD Galvan-Magana F. auteur aut IRD Potier Michel auteur aut IRD Ménard Frédéric auteur aut IRD text journalArticle eng text/pdf born digital access 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. specialized Meta-analysis Food webs Ecosystems Inter-ocean comparison Trophic relationships Classification trees Climate changes Macroecology PACIFIQUE OCEAN INDIEN ATLANTIQUE 036 040 020 021 140 Special Issue 55-73 2017 0967-0645 https://www.documentation.ird.fr/hor/fdi:010070230 10.1016/j.dsr2.2017.03.003 0967-0645 [F B010070230] https://www.documentation.ird.fr/hor/fdi:010070230 https://www.documentation.ird.fr/intranet/publi/2017/07/010070230.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2017-07-26 2023-07-11 fdi:010070230 fre