FN Archimer Export Format
PT J
TI Composition of biofouling communities on suspended oyster cultures: an in situ study of their interactions with the water column
BT 
AF MAZOUNI, Nabila
   GAERTNER, J
   DESLOUS-PAOLI, Jean-Marc
AS 1:;2:;3:;
FF 1:;2:;3:PDG-DRV-RA-LPALAVAS;
C1 IFREMER, Lab DEL Ecol, F-34203 Sete, France.
   Ctr Oceanol Marseille, Federat Rech 6106, F-13007 Marseille, France.
C2 IFREMER, FRANCE
   UNIV AIX MARSEILLE, FRANCE
SI SETE
   PALAVAS
SE PDG-DRV-RH-LSETE
   PDG-DRV-RA-LPALAVAS
IN WOS Ifremer jusqu'en 2018
IF 1.903
TC 59
UR https://archimer.ifremer.fr/doc/1996/publication-809.pdf
LA English
DT Article
DE ;Ascidians;Fluxes;Multicompartment approach;Biofouling;Oyster culture
AB This study was based on in situ experiments conducted in a shellfish lagoon (Thau, France) to determine the interactions between suspended oyster Crassostrea gigas Thunberg cultures and their environment at a seasonal scale. Three groups of descriptors were considered simultaneously during the course of the study: the taxonomic composition of an oyster culture unit (OCU), the nutrient and oxygen exchanges at the OCU-water interface (fluxes) and the water-column characteristics (water). We used a multiple factorial analysis (MFA) to assess in a single reference frame: (1) the seasonal organisation of the taxonomic groups which compose the OCU and (2) the interactions between this multispecific assemblage and the water column. We found strong seasonal variability in the OCU composition and the OCU interactions with the water column. Taxonomic richness of the biofouling was at a maximum in spring and minimum in August after a bottom anoxia. Among biofouling species, ascidians always constituted the dominant group. The annual pattern of coexistence observed between ascidians and oysters might be explained by resource partitioning, and also by a beneficial trophic interaction between these 2 groups. The structure of the OCU was based on a complex system of interactions, particularly in spring. During this season, the development on the OCU of macrofauna of soft substratum such as polychaetes reflected the presence of a suspended sediment compartment. The influence of the OCU on the water column was maximum in summer and minimum in winter. In the shellfish zone, the OCU plays a central role in nutrient renewal, particularly in summer when benthic fluxes are insufficient to satisfy phytoplankton nitrogen requirements. We estimate that the multispecific assemblages occurring on the oyster ropes (oysters and biofouling) have a potential annual DIN production of 2 x 10(7) mol yr(-1) and thus oyster cultures could have a determining influence on nitrogen recycling in the water column in the Thau lagoon.
PY 2001
PD APR
SO Marine Ecology Progress Series
SN 0171-8630
PU Inter-Research
VL 214
UT 000168974500008
BP 93
EP 102
ID 809
ER

EF