@article{fdi:010064079,
  title = {{N}itrogen isotopic baselines and implications for estimating foraging habitat and trophic position of yellowfin tuna in the {I}ndian and {P}acific {O}ceans},
  author = {{L}orrain, {A}nne and {G}raham, {B}. {S}. and {P}opp, {B}. {N}. and {A}llain, {V}. and {O}lson, {R}. {J}. and {H}unt, {B}. {P}. {V}. and {P}otier, {M}ichel and {F}ry, {B}. and {G}alvan-{M}agana, {F}. and {M}enkes, {C}hrisophe and {K}aehler, {S}. and {M}{\'e}nard, {F}r{\'e}d{\'e}ric},
  editor = {},
  language = {{ENG}},
  abstract = {{A}ssessment of isotopic compositions at the base of food webs is a prerequisite for using stable isotope analysis to assess foraging locations and trophic positions of marine organisms. {O}ur study represents a unique application of stable-isotope analyses across multiple trophic levels (primary producer, primary consumer and tertiary consumer) and over a large spatial scale in two pelagic marine ecosystems. {W}e found that delta {N}-15 values of particulate organic matter ({POM}), barnacles and phenylalanine from the muscle tissue of yellowfin tuna all showed similar spatial patterns. {T}his consistency suggests that isotopic analysis of any of these can provide a reasonable proxy for isotopic variability at the base of the food web. {S}econdly, variations in the delta {N}-15 values of yellowfin tuna bulk-muscle tissues paralleled the spatial trends observed in all of these isotopic baseline proxies. {V}ariation in isotopic composition at the base of the food web, rather than differences in tuna diet, explained the 11 parts per thousand variability observed in the bulk-tissue delta {N}-15 values of yellowfin tuna. {E}valuating the trophic position of yellowfin tuna using amino-acid isotopic compositions across the western {I}ndian and equatorial {P}acific {O}ceans strongly suggests these tuna occupy similar trophic positions, albeit absolute trophic positions estimated by this method were lower than expected. {T}his study reinforces the importance of considering isotopic baseline variability for diet studies, and provides new insights into methods that can be applied to generate nitrogen isoscapes for worldwide comparisons of top predators in marine ecosystems.},
  keywords = {{POM} ; {B}arnacles ; {L}epas anatifera ; {T}hunnus albacares ; {N}itrogen stable isotopes ; {M}arine top predators ; {A}mino acids ; {AA}-{CSIA} ; {PACIFIQUE} ; {OCEAN} {INDIEN}},
  booktitle = {{I}mpacts of climate on marine top predators},
  journal = {{D}eep-{S}ea {R}esearch {P}art {II} : {T}opical {S}tudies in {O}ceanography},
  volume = {113},
  numero = {{N}o sp{\'e}cial},
  pages = {188--198},
  ISSN = {0967-0645},
  year = {2015},
  DOI = {10.1016/j.dsr2.2014.02.003},
  URL = {https://www.documentation.ird.fr/hor/fdi:010064079},
}