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Resumen del producto
Duffy, L.M., J.W., Young, R.J., Olson, F., Ménard, P., Kuhnert, H.R., Pethybridge, V., Allain, M., Simier, J.M., Logan, N., Goñi, M., Potier, E., Romanov, F., Galván-Magaña, M.J., Lansdell, M., Staudinger, M., Abecassis & C.A., Choy
(2016).
Global trophic ecology of yellowfin, bigeye and albacare tunas: can spatial analyses be used to hypothesize predation changes in a warming ocean?.
67th Annual Tuna Conference.
Lake Arrowhead, Cal, USA, Estados Unidos de América, mayo 16 - 19, 2016,
11.
Global trophic ecology of yellowfin, bigeye and albacare tunas: can spatial analyses be used to hypothesize predation changes in a warming ocean?
Leanne M. Duffy, Jock W. Young, Robert J. Olson, Frédéric Ménard, Petra Kuhnert, Heidi R. Pethybridge, Valérie Allain, Monique Simier, John M. Logan, Nicolas Goñi, Michel Potier, Evgeny Romanov, Felipe Galván-Magaña, Matthew J. Lansdell, Michelle Staudinger, Melanie Abecassis y C. Anela Choy
We developed a global database of predator-prey interactions of three species of high trophic level tunas: Yellowfin (Thunnus albacares), Bigeye (T. obesus) and Albacore (T. alalunga), collected over a 40 year period from the Pacific, Indian and Atlantic Oceans. We used the database to quantitatively assess broad, macro-scale trophic patterns in pelagic ecosystems. A modified classification tree approach showed significant spatial differences in the principal prey consumed by all three species of tunas, reflecting regional distributions of micronekton. Generalized additive models revealed that diet diversity was mainly driven by regional-scale processes and tuna size. Diet diversity of Yellowfin and Albacore was greatest in regions typically characterized by low levels of primary production, whereas in regions of high productivity, diet diversity was generally low. Ontogenetic spatial patterns in diet diversity were found for Bigeye, with larger fish less affected by concentrations of primary production. These results suggest that the current expansion of warmer, less productive waters in the world’s oceans may alter foraging opportunities of these tunas due to changes in the regional abundance of prey resources. Such a hypothesis is testable if well-planned and long-term diet monitoring programs are established.
Palabras clave: Thunnus Albacares; Thunnus obesus; Yellowfin; Bigeye; Albacore; Thunnus alalunga
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