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Article Dans Une Revue ADVANCES IN MARINE BIOLOGY, VOL 74 Année : 2016

Bioenergetics, Trophic Ecology, and Niche Separation of Tunas

R. J. Olson
  • Fonction : Auteur
J. W. Young
  • Fonction : Auteur
M. Potier
  • Fonction : Auteur
V. Allain
  • Fonction : Auteur
N. Goni
  • Fonction : Auteur
J. M. Logan
  • Fonction : Auteur
F. Galvan-Magana
  • Fonction : Auteur

Résumé

Tunas are highly specialized predators that have evolved numerous adaptations for a lifestyle that requires large amounts of energy consumption. Here we review our understanding of the bioenergetics and feeding dynamics of tunas on a global scale, with an emphasis on yellowfin, bigeye, skipjack, albacore, and Atlantic bluefin tunas. Food consumption balances bioenergetics expenditures for respiration, growth (including gonad production), specific dynamic action, egestion, and excretion. Tunas feed across the micronekton and some large zooplankton. Some tunas appear to time their life history to take advantage of ephemeral aggregations of crustacean, fish, and molluscan prey. Ontogenetic and spatial diet differences are substantial, and significant interdecadal changes in prey composition have been observed. Diet shifts from larger to smaller prey taxa highlight ecosystem-wide changes in prey availability and diversity and provide implications for changing bioenergetics requirements into the future. Where tunas overlap, we show evidence of niche separation between them; resources are divided largely by differences in diet percentages and size ranges of prey taxa. The lack of long-term data limits the ability to predict impacts of climate change on tuna feeding behaviour. We note the need for systematic collection of feeding data as part of routine monitoring of these species, and we highlight the advantages of using biochemical techniques for broad-scale analyses of trophic relations. We support the continued development of ecosystem models, which all too often lack the regional-specific trophic data needed to adequately investigate climate and fishing impacts.
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Dates et versions

hal-01424429 , version 1 (02-01-2017)

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R. J. Olson, J. W. Young, Frédéric Ménard, M. Potier, V. Allain, et al.. Bioenergetics, Trophic Ecology, and Niche Separation of Tunas. ADVANCES IN MARINE BIOLOGY, VOL 74, 2016, 74, pp.199-344. ⟨10.1016/bs.amb.2016.06.002⟩. ⟨hal-01424429⟩
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