FN Archimer Export Format
PT J
TI Changes in planktonic microbial components in interaction with juvenile oysters during a mortality episode in the Thau lagoon (France)
BT 
AF Richard, Marion
   Bec, Beatrice
   Vanhuysse, Charles
   Mas, Sébastien
   Parin, David
   Chantalat, Camila
   Le Gall, Patrik
   Fiandrino, Annie
   Lagarde, Franck
   Mortreux, Serge
   Ouisse, Vincent
   Rolland, Jean-Luc
   Degut, Anaïs
   Hatey, Elise
   FORTUNE, Martine
   ROQUE D'ORBCASTEL, Emmanuelle
   Messiaen, Gregory
   Munaron, Dominique
   Callier, Myriam
   Oheix, Jocelyne
   Derolez, Valerie
   Mostajir, Behzad
AS 1:1;2:6;3:1,2;4:3;5:3;6:1;7:1;8:1;9:1;10:1;11:1;12:4;13:6;14:7;15:1;16:1;17:1;18:1;19:5;20:1;21:1;22:7;
FF 1:PDG-ODE-LITTORAL-LERLR;2:;3:;4:;5:;6:;7:PDG-ODE-LITTORAL-LERLR;8:PDG-ODE-LITTORAL-LERLR;9:PDG-ODE-LITTORAL-LERLR;10:PDG-ODE-LITTORAL-LERLR;11:PDG-ODE-LITTORAL-LERLR;12:PDG-RBE-IHPE;13:;14:;15:PDG-ODE-LITTORAL-LERLR;16:PDG-ODE-LITTORAL-LERLR;17:PDG-ODE-LITTORAL-LERLR;18:PDG-ODE-LITTORAL-LERLR;19:PDG-RBE-MARBEC-LAAAS;20:PDG-ODE-LITTORAL-LERLR;21:PDG-ODE-LITTORAL-LERLR;22:;
C1 MARBEC UM, CNRS, IFREMER, IRD, Sete, France
   MARBEC UM, CNRS, IFREMER, IRD, Montpellier, France
   MEDIMEER UMS, SMEL, 2 rue des Chantiers, Sète, France
   Univ Perpignan Via Domitia, CNRS, IHPE UMR 5244, UM, Pl Eugene Bataillon, F-34095 Montpellier, France
   MARBEC UMR UM, CNRS, IFREMER, IRD, Palavas Les Flots, France
C2 IFREMER, FRANCE
   IFREMER, FRANCE
   SMEL, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   UNIV MONTPELLIER, FRANCE
   CNRS, FRANCE
SI SETE
   MONTPELLIER
   PALAVAS
SE PDG-ODE-LITTORAL-LERLR
   PDG-RBE-IHPE
   PDG-RBE-MARBEC-LAAAS
UM MARBEC
   IHPE
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 3.224
TC 7
UR https://archimer.ifremer.fr/doc/00474/58559/61115.pdf
LA English
DT Article
DE ;Magallana gigas;Crassostrea gigas;Spat;OsHV-1 mu Var;Mortality;Picoplankton;Heterotrophic flagellates;Ciliates;Uronema;Balanion
AB Oysters modify the planktonic microbial community structure by their filtration and NH4 excretion activities. While many studies have been conducted on this subject with adult oysters, none had been carried out in situ with juveniles. Pacific oyster juveniles (Magallana gigas, previously Crassostrea gigas) died massively all over the world since 2008 in relation with OsHV-1 infection. During mortality episodes, sick and dead oysters are not separated from healthy live ones, and left to decay in the surrounding environment, with unknown consequences for the nutrient cycle and planktonic microbial components (PMC). The present study aimed to elucidate for the first time the interactions between oyster juveniles and PMC during a mortality episode. Innovative 425-L pelagic chambers were deployed weekly in situ around oyster lanterns along a stocking-density gradient in the Thau Mediterranean lagoon (France) before, during and after an oyster mortality episode, from April to May 2015. This study reveals (i) significant changes of planktonic microbial community structure during mortality episodes, with a proliferation of picoplankton (<3 μm) and ciliates (Balanion sp., Uronema sp.) within 2 weeks when mortality rates and numbers of moribund juvenile oysters were highest. These changes were probably induced by oyster tissue leaching, decomposition and mineralization, which probably began during the moribund period, as suggested by an increase of PO4 concentration and N:P ratio decrease, (ii) oyster juveniles mainly retained 3–20 μm plankton. In contrast to adults, picophytoplankton and small heterotrophic flagellates (<3 μm) were significantly depleted in the presence of oyster juveniles. Depletion of picoplankton occurred only at the starting of the mortality episode and during the moribund phase. (iii) Oyster juvenile filtration and mortality shifted the planktonic microbial structure toward a heterotrophic microbial system, where ciliates and heterotrophic flagellates acted as a trophic link between picoplankton and oysters. The next stage of our investigation is to examine the effect of a mortality episode on pathogen fluxes in the water column, exploring their relationships with planktonic components and dead oyster flesh. 
PY 2019
PD MAR
SO Aquaculture
SN 0044-8486
PU Elsevier BV
VL 503
UT 000458730400027
BP 231
EP 241
DI 10.1016/j.aquaculture.2018.12.082
ID 58559
ER

EF