@article{fdi:010087578,
  title = {{T}esting the bottom-up hypothesis for the decline in size of anchovy and sardine across {E}uropean waters through a bioenergetic modeling approach},
  author = {{M}enu, {C}. and {P}ecquerie, {L}aure and {B}acher, {C}. and {D}oray, {M}. and {H}attab, {T}. and van der {K}ooij, {J}. and {H}uret, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}mall pelagic fish have shown a general decrease in size and body condition over the past two decades in several {E}uropean regional seas. {A}lthough the underlying processes are still not well understood, recent studies point to a bottom-up control. {I}n order to better understand how the environment impacts the main individual life history traits, which themselves control the dynamic of the population, we developed a comparative approach between two species, {E}uropean anchovy and sardine, and across three regions of the {N}ortheast {A}tlantic and {M}editerra-nean {S}ea: the {E}nglish {C}hannel in the north, to the {B}ay of {B}iscay and the {G}ulf of {L}ion in the south. {W}e developed a bioenergetic modeling framework based on the {D}ynamic {E}nergy {B}udget theory ({DEB}). {O}ur {DEB} models were forced using two different representations of the lower trophic levels, {POLCOMS}-{ERSEM} and {SEAPODYM} models. {O}ur models were calibrated for the {B}ay of {B}iscay and then projected on to the other regions, over the early 2000s (period with bigger fish) and the early 2010s (period with smaller fish). {T}he environment alone, temperature and zooplankton, explained a significant part of the observed regional differences in growth. {H}owever, the temporal trends simulated by the lower trophic levels models, when transcribed through bio-energetics, could not explain the strong decrease in length and weight that occurred in the {B}ay of {B}iscay (-30 % in weight for anchovy and-20 % for sardine) and in the {G}ulf of {L}ion (-30 % for anchovy and-50 % for sardine). {T}hrough a scenario approach, we estimated that a decrease in zooplankton quality could be a significant driver of the observed decrease in size both in the {B}ay of {B}iscay and in the {G}ulf of {L}ion (decrease in assimilable energy of 4 to 5 % and 15 to 17 % in the {B}ay of {B}iscay and the {G}ulf of {L}ion, respectively). {F}or such a decrease in size, a zooplankton biomass of the same quality should have been reduced by between 17 and 31 % in the {B}ay of {B}iscay over a 10-to 15-year period, while no biologically realistic estimations were obtained for the {G}ulf of {L}ion. {T}he validity of these proposed changes in biomass and quality is discussed in context of alternative explanations.},
  keywords = {{P}elagic environment ; {B}ioenergetics ; {L}ife history traits ; {S}mall pelagic fish ; {Z}ooplankton ; {E}nglish {C}hannel ; {B}ay of {B}iscay ; {G}ulf of {L}ion ; {EUROPE} ; {ATLANTIQUE} ; {MEDITERRANEE} ; {MER} {DU} {NORD} ; {GASCOGNE} {GOLFE} ; {LION} {GOLFE}},
  booktitle = {},
  journal = {{P}rogress in {O}ceanography},
  volume = {210},
  numero = {},
  pages = {102943 [20 ]},
  ISSN = {0079-6611},
  year = {2023},
  DOI = {10.1016/j.pocean.2022.102943},
  URL = {https://www.documentation.ird.fr/hor/fdi:010087578},
}