@article{fdi:010095586,
  title = {{H}ow contrasted environments in the {H}umboldt {C}urrent {S}ystem, {P}acific {W}arm {P}ool and {S}outh {P}acific {G}yre, shape contrasted ecosystems : a modelling approach using {APECOSM}},
  author = {{D}alaut, {L}aureline and {B}arrier, {N}icolas and {L}engaigne, {M}atthieu and {M}aury, {O}livier},
  editor = {},
  language = {{ENG}},
  abstract = {{P}elagic ecosystems exhibit a strong regional heterogeneity, driven by physical and biogeochemical characteristics. {U}sing the global 3{D} marine ecosystem model {APECOSM}, we simulate six high-trophic-level communities, capturing their size structure, spatial distribution, and trophic interactions up to 1,000 metres depth. {W}e examine how different environments shape their contrasting organisation and interactions in three {P}acific {O}cean regions: the productive {H}umboldt {C}urrent {S}ystem, the oligotrophic {S}outh {P}acific {G}yre, and the thermally stratified {P}acific {W}arm {P}ool. {S}imulations reveal strong regional contrasts in ecosystem responses. {I}n the {H}umboldt, high primary production supports important biomass of small coastal pelagic fish. {S}easonal warming enables tuna to forage in these productive waters, while low-oxygen conditions restrict the vertical range and abundance of mesopelagic organisms and concentrate epipelagic organisms close to the surface. {I}n the {W}arm {P}ool, apex predators remain abundant despite low primary production, thanks to efficient trophic transfer and biomass import from neighbouring regions. {S}eamounts concentrate mesopelagic organisms into shallow layers, making them accessible to epipelagic predators. {I}n contrast, the {S}outh {P}acific {G}yre supports sparse, imported high-trophiclevels with limited trophic coupling and strong intra-community predation. {W}e quantify regional differences in trophic transfer efficiency and network complexity, identifying thresholds below which high-trophic-levels collapse. {T}hese findings illustrate the emergent plasticity of pelagic ecosystems and the importance of bottom-up control of high-trophic-level biomass. {T}hey emphasise the importance of temperature, transport, light and oxygen in modulating horizontal and vertical distributions, controlling the co-occurrence of predators and prey, and influencing the formation of schools, ultimately impacting trophic interactions and community assemblages.},
  keywords = {{APECOSM} ; {M}echanistic ecosystem model ; {E}cosystem structure ; {E}cosystem function ; {P}elagic ecosystem ; {T}rophic interactions ; {H}umbold {C}urrent {S}ystem ; {P}acific {W}arm {P}ool ; {S}outh {P}acific {G}yre ; {PACIFIQUE}},
  booktitle = {},
  journal = {{P}rogress in {O}ceanography},
  volume = {240},
  numero = {},
  pages = {103615 [24 p.]},
  ISSN = {0079-6611},
  year = {2026},
  DOI = {10.1016/j.pocean.2025.103615},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095586},
}