@article{fdi:010074382,
  title = {{A} global meta-analysis of marine predator nitrogen stable isotopes : relationships between trophic structure and environmental conditions},
  author = {{P}ethybridge, {H}. and {C}hoy, {C}. {A}. and {L}ogan, {J}. {M}. and {A}llain, {V}. and {L}orrain, {A}nne and {B}odin, {N}athalie and {S}omes, {C}. {J}. and {Y}oung, {J}. and {M}{\'e}nard, {F}r{\'e}d{\'e}ric and {L}anglais, {C}. and {D}uffy, {L}. and {H}obday, {A}. {J}. and {K}uhnert, {P}. and {F}ry, {B}. and {M}enk{\`e}s, {C}hristophe and {O}lson, {R}. {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}im {W}e examined potential environmental drivers of broad-scale spatial patterns in the trophic structure of marine ecosystems as represented by nitrogen stable isotopes in globally distributed marine predators. {A}dditionally, we assessed the effects of spatial scale on the predictive capabilities of environmental variables. {L}ocation{T}ime period{G}lobal oceans. 2000 to 2015. {M}ajor taxa studied{M}ethods{T}unas: {T}hunnus albacares, {T}hunnus obesus, {T}hunnus alalunga. {W}e undertook a global compilation and meta-analysis of the bulk nitrogen stable isotope ratios ({N}-15 values) of three tuna species (n=4,281). {A}fter adjusting for regional variations in baseline {N}-15 values using a global ocean biogeochemistry model, generalized additive mixed models were employed to infer global-scale oceanographic controls of trophic structure, using cosmopolitan tuna species as a model. {R}esults{M}ain conclusions{F}or the three tuna species, variation in trophic position estimated using bulk {N}-15 values was largely explained by geographical location and the corresponding oxygen minimum layer depth. {T}una trophic positions declined in areas with reduced oxygen at depth. {F}ood-chain length, as captured by maximum trophic position, was longer in areas of the western {P}acific {O}cean and shorter in the northern {A}tlantic and eastern {P}acific {O}ceans. {T}rophic adaptability of the tuna predators, as indicated by intraspecific variability, was highest in the western and central {P}acific {O}cean and lowest in the northern {A}tlantic {O}cean. {O}ur analysis demonstrated that while tunas share similar functional trophic roles, deeper-foraging tuna species had higher trophic positions globally. {T}he predictive capacity of environmental variables decreased at finer (regional) spatial scales. {O}ur work suggests that habitat compression resulting from the predicted global expansion of oxygen minimum zones with ocean warming will impact the trophic structure of marine food webs and the corresponding foraging habits of marine predators. {S}patial scale analyses highlighted the importance of representing differences in regional ecological dynamics in global-scale trophic and ecosystem models.},
  keywords = {albacore tuna ; bigeye tuna ; biological oceanography ; food webs ; macroecology ; oxygen minimum zone ; trophodynamics ; yellowfin tuna},
  booktitle = {},
  journal = {{G}lobal {E}cology and {B}iogeography},
  volume = {27},
  numero = {9},
  pages = {1043--1055},
  ISSN = {1466-822{X}},
  year = {2018},
  DOI = {10.1111/geb.12763},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074382},
}