@article{fdi:010079387,
  title = {{G}lobal patterns and inferences of tuna movements and trophodynamics from stable isotope analysis},
  author = {{L}ogan, {J}. {M}. and {P}ethybridge, {H}. and {L}orrain, {A}nne and {S}omes, {C}. {J}. and {A}llain, {V}. and {B}odin, {N}athalie and {C}hoy, {C}. {A}. and {D}uffy, {L}. and {G}oni, {N}. and {G}raham, {B}. and {L}anglais, {C}. and {M}{\'e}nard, {F}r{\'e}d{\'e}ric and {O}lson, {R}. and {Y}oung, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} global dataset of carbon stable isotope (delta {C}-13) values from yellowfin, bigeye, and albacore tuna muscle tissue (n = 4275) was used to develop a novel tool to infer broad-scale movement and residency patterns of these highly mobile marine predators. {T}his tool was coupled with environmental models and lipid content ({C}:{N} ratio) of tuna muscle tissues to examine ocean warming impacts on tuna ecology and bioenergetic condition across {L}onghurst provinces. {O}ver a 16-year study period (2000-2015), latitudinal gradients in tuna delta {C}-13 values were consistent, with values decreasing with increasing latitude. {T}una delta {C}-13 values, reflecting modelled global phytoplankton delta {C}-13 landscapes ("isoscapes"), were largely related to spatial changes in oxygen concentrations at depth and temporal changes in sea surface temperature. {O}bserved tuna isoscapes (delta {C}-13({LS}corr)), corrected for lipid content and the {S}uess effect (oceanic changes in {CO}2 over time), were subtracted from model-predicted baseline isoscapes ({D}elta {C}-13(tuna-phyto)) to infer spatial movement and residency patterns of the different tuna species. {S}table isotope niche width was calculated for each {L}onghurst province using {D}elta {C}-13(tuna-phyto) and baseline-corrected nitrogen isotope (delta {N}-15(tuna-phyto)) values to further quantify isotopic variability as evidence of movements across isoscapes. {A} high degree of movement-defined as the deviation from the expected range of {D}elta {C}-13(tuna-phyto) values- was evident in three {L}onghurst provinces: {G}uinea current coast, {P}acific equatorial divergence, and the {N}orth {P}acific equatorial counter current. {T}he highest level of population dispersal (variability in {D}elta {C}-13(tuna-phyto) values) was observed in {L}onghurst provinces within the western and central {P}acific {O}ceans and in the {G}uinea current coast. {W}hile lipid content was low in yellowfin and bigeye, high and variable lipid stores in albacore muscle were consistent with seasonal movements between productive foraging and oligotrophic spawning habitats. {O}ur ability to characterize tuna movement patterns without ambiguity remains challenged by uncertainty in trophic discrimination factors and ecological (e.g. diet variability) processes. {H}owever, this study illustrates that model-corrected delta {C}-13 values are a valuable, relatively cost-effective tool for identifying potential areas of mixing across management zones, particularly when electronic tagging studies are limited or absent. {S}table isotope analyses of tuna tissues can therefore be an additional tool for guiding spatial stock assessments on top predator movement, dispersal patterns, and how they may be altered under a changing climate.},
  keywords = {{A}lbacore tuna ; {B}igeye tuna ; {Y}ellowfin tuna ; {C}arbon isotope analysis ; {M}ovement indicators ; {G}lobal ocean ; {F}isheries management ; {MONDE}},
  booktitle = {},
  journal = {{D}eep-{S}ea {R}esearch {P}art {II} : {T}opical {S}tudies in {O}ceanography},
  volume = {175},
  numero = {},
  pages = {art. 104775 [19 p.]},
  ISSN = {0967-0645},
  year = {2020},
  DOI = {10.1016/j.dsr2.2020.104775},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079387},
}