FN Archimer Export Format PT J TI Testing the bottom-up hypothesis for the decline in size of anchovy and sardine across European waters through a bioenergetic modeling approach BT AF Menu, Clara Pecquerie, Laure Bacher, Cedric Doray, Mathieu Hattab, Tarek van der Kooij, Jeroen Huret, Martin AS 1:1;2:2;3:3;4:4;5:5;6:6;7:1; FF 1:PDG-RBE-HALGO-LBH;2:;3:PDG-ODE-DYNECO;4:PDG-RBE-HALGO-EMH;5:PDG-RBE-MARBEC-LHM;6:;7:PDG-RBE-HALGO-LBH; C1 DECOD (Ecosystem Dynamics and Sustainability), IFREMER, INRAE, Institut Agro, Brest, France University of Brest- UMR 6539 CNRS/UBO/IRD/Ifremer, LEMAR – IUEM, Plouzané, France IFREMER, DYNECO, F-29280 Plouzané, France DECOD (Ecosystem Dynamics and Sustainability), IFREMER, INRAE, Institut Agro, Nantes, France MARBEC, Univ Montpellier, CNRS, IFREMER and IRD, Sète, France Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, United Kingdom C2 IFREMER, FRANCE IRD, FRANCE IFREMER, FRANCE IFREMER, FRANCE IFREMER, FRANCE CEFAS, UK SI BREST NANTES SETE SE PDG-RBE-HALGO-LBH PDG-ODE-DYNECO PDG-RBE-HALGO-EMH PDG-RBE-MARBEC-LHM UM LEMAR MARBEC DECOD IN WOS Ifremer UPR WOS Ifremer UMR WOS Cotutelle UMR copubli-france copubli-p187 copubli-europe IF 4.1 TC 7 UR https://archimer.ifremer.fr/doc/00812/92434/102391.pdf LA English DT Article CR CAMANOC CGFS : CHANNEL GROUND FISH SURVEY CGFS2015 ECLAIR3 EVHOE 2014 EVHOE 2015 EVHOE EVALUATION HALIEUTIQUE OUEST DE L'EUROPE JUVAGA/03 JUVESU99 MICRODYN/3 PELGAS PELGAS 2002 PELGAS 2003 PELGAS 2004 PELGAS 2005 PELGAS 2006 PELGAS 2007 PELGAS 2008 PELGAS 2009 PELGAS 2010 PELGAS 2011 PELGAS 2012 PELGAS 2013 PELGAS 2014 PELGAS 2015 PELGAS 2016 PELGAS 2017 PELGAS 2018 PELGAS 2019 PELMED - PELAGIQUES MEDITERRANÉE PELMED 2002 PELMED 2003 PELMED 2004 PELMED 2005 PELMED 2006 PELMED 2007 PELMED 2008 PELMED 2009 PELMED 2010 PELMED 2011 PELMED 2012 PELMED 2013 PELMED 2014 PELMED 2015 PELMED 2016 PELMED 2017 PELMED 2018 PELMED 2019 PLAGIA4 PLAGIA5 BO Thalassa Thalia Gwen Drez L'Europe DE ;Pelagic environment;Bioenergetics;Life history traits;Small pelagic fish;Zooplankton;English Channel;Bay of Biscay;Gulf of Lion AB Small pelagic fish have shown a general decrease in size and body condition over the past two decades in several European regional seas. Although the underlying processes are still not well understood, recent studies point to a bottom-up control. In 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, European anchovy and sardine, and across three regions of the Northeast Atlantic and Mediterranean Sea: the English Channel in the north, to the Bay of Biscay and the Gulf of Lion in the south. We developed a bioenergetic modeling framework based on the Dynamic Energy Budget theory (DEB). Our DEB models were forced using two different representations of the lower trophic levels, POLCOMS-ERSEM and SEAPODYM models. Our models were calibrated for the Bay of Biscay and then projected on to the other regions, over the early 2000s (period with bigger fish) and the early 2010s (period with smaller fish). The environment alone, temperature and zooplankton, explained a significant part of the observed regional differences in growth. However, the temporal trends simulated by the lower trophic levels models, when transcribed through bioenergetics, could not explain the strong decrease in length and weight that occurred in the Bay of Biscay (-30 % in weight for anchovy and −20 % for sardine) and in the Gulf of Lion (-30 % for anchovy and −50 % for sardine). Through 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 Bay of Biscay and in the Gulf of Lion (decrease in assimilable energy of 4 to 5 % and 15 to 17 % in the Bay of Biscay and the Gulf of Lion, respectively). For such a decrease in size, a zooplankton biomass of the same quality should have been reduced by between 17 and 31 % in the Bay of Biscay over a 10- to 15-year period, while no biologically realistic estimations were obtained for the Gulf of Lion. The validity of these proposed changes in biomass and quality is discussed in context of alternative explanations. PY 2023 PD JAN SO Progress In Oceanography SN 0079-6611 PU Elsevier BV VL 210 UT 000964761500001 DI 10.1016/j.pocean.2022.102943 ID 92434 ER EF