@article{fdi:010087518,
  title = {{M}echanisms underlying the epipelagic ecosystem response to {ENSO} in the equatorial {P}acific ocean},
  author = {{B}arrier, {N}icolas and {L}engaigne, {M}atthieu and {R}ault, {J}onathan and {P}erson, {R}enaud and {E}the, {C}. and {A}umont, {O}livier and {M}aury, {O}livier},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {E}l {N}ino/{S}outhern {O}scillation is known to strongly impact marine ecosystems and fisheries. {I}n particular, {E}l {N}ino years are characterized, among other things, by a decrease in tuna catches in the western {P}acific and an increase in the central {P}acific, whereas these catches accumulate in the far western {P}acific during {L}a {N}ina conditions. {H}owever, the processes driving this zonal shift in the tuna catch (changing habitat conditions, currents or food availability) remain unclear. {H}ere, we use an hindcast simulation from the mechanistic ecosystem model {APECOSM} that reasonably reproduces the observed zonal shift of the epipelagic community in response to {ENSO} to understand the mechanisms underlying this shift.{A}lthough the response of modeled epipelagic communities to {E}l {N}ino is relatively similar for the different size classes studied, the processes responsible for these changes vary considerably by organism size. {O}ne of the major results of our analysis is the critical role of eastward passive transport by {E}l {N}ino-related surface current anomalies for all size classes. {W}hile the effects of passive transport dominate the effects of growth and predation changes for large organisms, this is not the case for intermediate-sized organisms in the western {P}acific, where the decrease in biomass is first explained by increased predation and then decreased foraging success. {F}or small organisms, changes in growth rate, induced by the influence of temperature on fish physiology, is an important process that reinforces the biomass increase induced by passive horizontal transport in the eastern {P}acific and the biomass decrease induced by increased predation by intermediate -sized organisms near the dateline. {F}inally, contrary to what is often assumed, our model shows that active habitat-based movements are not required to explain the westward biomass shifts that are observed during {ENSO}.{T}his study illustrates the relevance of using a mechanistic ecosystem model to disentangle the role of the different processes controlling biomass changes. {I}t highlights the essential dynamic role of ocean currents in shaping the response of marine communities to climate variability and its interaction with biological (e.g. growth) and ecological (e.g. foraging and predation) processes, whose relative importance varies with organisms' size and contribute to modify the community structure.},
  keywords = {{F}ish ; {B}iomass ; {ENSO} ; {E}l {N}ino ; {L}a {N}ina ; {E}cosystem modeling ; {DEB} ; {A}dvection ; {G}rowh ; {P}redation ; {E}quatorial {P}acific ; {APECOSM} ; {E}pipelagic ; {E}cosystem ; {H}abitat ; {PACIFIQUE}},
  booktitle = {},
  journal = {{P}rogress in {O}ceanography},
  volume = {213},
  numero = {},
  pages = {103002 [16 p.]},
  ISSN = {0079-6611},
  year = {2023},
  DOI = {10.1016/j.pocean.2023.103002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010087518},
}