@article{fdi:010061744,
  title = {{C}omprehensive model of jumbo squid {D}osidicus gigas trophic ecology in the {N}orthern {H}umboldt {C}urrent {S}ystem},
  author = {{A}legre, {A}. and {M}{\'e}nard, {F}r{\'e}d{\'e}ric and {T}afur, {R}. and {E}spinoza, {P}. and {A}rguelles, {J}. and {M}aehara, {V}. and {F}lores, {O}. and {S}imier, {M}onique and {B}ertrand, {A}rnaud},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he jumbo squid {D}osidicus gigas plays an important role in marine food webs both as predator and prey. {W}e investigated the ontogenetic and spatiotemporal variability of the diet composition of jumbo squid in the northern {H}umboldt {C}urrent system. {F}or that purpose we applied several statistical methods to an extensive dataset of 3,618 jumbo squid non empty stomachs collected off {P}eru from 2004 to 2011. {A} total of 55 prey taxa was identified that we aggregated into eleven groups. {O}ur results evidenced a large variability in prey composition as already observed in other systems. {H}owever, our data do not support the hypothesis that jumbo squids select the most abundant or energetic taxon in a prey assemblage, neglecting the other available prey. {I}ndeed, multinomial model predictions showed that stomach fullness increased with the number of prey taxa, while most stomachs with low contents contained one or two prey taxa only. {O}ur results therefore question the common hypothesis that predators seek locally dense aggregations of monospecific prey. {I}n addition {D}. gigas consumes very few anchovy {E}ngraulis ringens in {P}eru, whereas a tremendous biomass of anchovy is potentially available. {I}t seems that {D}. gigas cannot reach the oxygen unsaturated waters very close to the coast, where the bulk of anchovy occurs. {I}ndeed, even if jumbo squid can forage in hypoxic deep waters during the day, surface normoxic waters are then required to recover its maintenance respiration (or energy?). {O}xygen concentration could thus limit the co-occurrence of both species and then preclude predator-prey interactions. {F}inally we propose a conceptual model illustrating the opportunistic foraging behaviour of jumbo squid impacted by ontogenetic migration and potentially constrained by oxygen saturation in surface waters.},
  keywords = {{PEROU}},
  booktitle = {},
  journal = {{P}los {O}ne},
  volume = {9},
  numero = {1},
  pages = {e85919},
  ISSN = {1932-6203},
  year = {2014},
  DOI = {10.1371/journal.pone.0085919},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061744},
}