@article{fdi:010074880,
  title = {{S}easonal habitat and length influence on the trophic niche of co-occurring tropical tunas in the eastern {A}tlantic {O}cean},
  author = {{S}ardenne, {F}any and {D}iaha, {N}. {C}. and {A}mande, {M}. {J}. and {Z}udaire, {I}. and {C}outurier, {L}. {I}. {E}. and {M}etral, {L}. and {L}e {G}rand, {F}. and {B}odin, {N}athalie},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the {G}ulf of {G}uinea, bigeye tuna ({T}hunnus obesus; {BET}) and yellowfin tuna ({T}hunnus albacares; {YFT}) are an important part of commercial fisheries and play a prominent ecological role as top predators. {U}sing fatty acid profiles and carbon and nitrogen stable isotopes, we examined their trophic niche partitioning in this understudied region. {T}rophic niche overlap was high (> 70%), similar to percentages in other ocean basins. {BET} occupied a higher trophic position than {YFT} and fed on deeper prey (high delta {N}-15 values and high proportions of monounsaturated fatty acids). {T}he trophic position of {YFT} decreased slightly in the last 15 years (delta {N}-15 values decreased by similar to 0.5 parts per thousand), suggesting a change in epipelagic communities, as observed in the eastern {P}acific {O}cean. {O}ntogenic changes were limited to {BET}. {F}or both species, the dietary proportion of the diatom marker 20:5(n-3) increased in the seasonal upwelling area, highlighting the influence of seasonal habitat on the diet of tuna. {T}he relatively lipid-rich muscle (similar to 6% dry mass) of {A}tlantic tropical tuna suggests a richer diet in this region than that of {I}ndian {O}cean tropical tuna and (or) differences in energy allocation strategies.},
  keywords = {{ATLANTIQUE}},
  booktitle = {},
  journal = {{C}anadian {J}ournal of {F}isheries and {A}quatic {S}ciences},
  volume = {76},
  numero = {1},
  pages = {69--80},
  ISSN = {0706-652{X}},
  year = {2019},
  DOI = {10.1139/cjfas-2017-0368},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074880},
}