FN Archimer Export Format
PT J
TI Silicon consumption kinetics by marine sponges: An assessment of their role at the ecosystem level
BT 
AF LOPEZ-ACOSTA, Maria
   LEYNAERT, Aude
   GRALL, Jacques
   MALDONADO, Manuel
AS 1:1;2:2;3:3;4:1;
FF 1:;2:;3:;4:;
C1 CSIC, Ctr Adv Studies Blanes CEAB, Dept Marine Ecol, Blanes, Girona, Spain.
   Inst Univ Europeen Mer, UMR CNRS 6539, Lab Sci Environm Marin, Technopole Brest Iroise, Plouzane, France.
   Inst Univ Europeen Mer, UMS 3113, Observ Marin, Technopole Brest Iroise, Plouzane, France.
C2 CSIC, SPAIN
   CNRS, FRANCE
   UBO, FRANCE
UM LEMAR
IF 4.325
TC 15
UR https://archimer.ifremer.fr/doc/00616/72767/72250.pdf
   https://archimer.ifremer.fr/doc/00616/72767/72251.pdf
LA English
DT Article
CR HABENT
   REBENT 2017 BIS
BO Thalia
AB The silicic acid (DSi) is a dissolved nutrient used by diverse marine organisms to build their skeletons of biogenic silica (BSi). This consumption, mostly due to diatoms, largely determines the availability of DSi in the photic ocean. Yet growing evidence suggests that Si consumers traditionally disregarded, such as the siliceous sponges, may also play a role. This study investigated the kinetics of DSi utilization by two demosponges as a function of both DSi availability and duration of the incubation period (24 h vs. 48 h). Consumption increased with increasing DSi availability following a saturable Michaelis-Menten kinetics. Haliclona simulans saturated at about 70 mu M (K-m = 45.9) and Suberites ficus around 130 mu M (K-m = 108.2). Forty-eight hour incubations yielded more conservative consumption rates than 24 h incubations, particularly when DSi availability was far below saturation. DSi concentrations in the sponge natural habitats (0.2-15 mu M) were consistently much lower than required for efficient elaboration of the BSi skeleton, suggesting a chronic DSi limitation. The DSi consumption kinetics was combined with quantifications of sponge biomass in the Bay of Brest (France), which was used as case study. In this system, sponges consume daily 0.10 +/- 0.19 mmol Si m(-2) and about 6.4 x 10(6) mol Si yearly. This activity represents 7.6% of the net annual BSi production in the Bay, a figure overlooked in previous nutrient balances based only on diatoms. Since the world marine Si cycle does not yet incorporate the contribution of sponges, its global BSi production budget may also be underestimated. 
PY 2018
PD NOV
SO Limnology And Oceanography
SN 0024-3590
PU Wiley
VL 63
IS 6
UT 000450233300015
BP 2508
EP 2522
DI 10.1002/lno.10956
ID 72767
ER

EF