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Duffy L. M., Kuhner P. M., Pethybridge H. R., Young J. W., Olson R. J., Logan J. M., Goni N., Romanov E., Allain V., Staudinger M. D., Abecassis M., Choy C. A., Hobday A. J., Simier Monique, Galvan-Magana F., Potier Michel, Ménard Frédéric. (2017). Global trophic ecology of yellowfin, bigeye, and albacore tunas : understanding predation on micronekton communities at ocean-basin scales. Deep-Sea Research Part II : Topical Studies in Oceanography, 140 (Special Issue), 55-73. ISSN 0967-0645

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Lien direct chez l'éditeur doi:10.1016/j.dsr2.2017.03.003

Titre
Global trophic ecology of yellowfin, bigeye, and albacore tunas : understanding predation on micronekton communities at ocean-basin scales
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000403513400007
AuteursDuffy L. M., Kuhner P. M., Pethybridge H. R., Young J. W., Olson R. J., Logan J. M., Goni N., Romanov E., Allain V., Staudinger M. D., Abecassis M., Choy C. A., Hobday A. J., Simier Monique, Galvan-Magana F., Potier Michel, Ménard Frédéric.
SourceDeep-Sea Research Part II : Topical Studies in Oceanography, 2017, 140 (Special Issue), p. 55-73. ISSN 0967-0645
RésuméPredator-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.
Plan de classementEcologie, systèmes aquatiques [036] ; Ressources halieutiques [040] ; Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Sciences du milieu [021]
Descr. géo.PACIFIQUE ; OCEAN INDIEN ; ATLANTIQUE
LocalisationFonds IRD [F B010070230]
Identifiant IRDfdi:010070230
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010070230

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