FN Archimer Export Format
PT J
TI Bacterivory in the common foraminifer Ammonia tepida: Isotope tracer experiment and the controlling factors
BT 
AF PASCAL, P.Y.
   DUPUY, C
   RICHARD, P
   NIQUIL, N
AS 1:;2:;3:;4:;
FF 1:;2:;3:;4:;
TC 0
UR https://archimer.ifremer.fr/doc/2008/publication-4298.pdf
LA English
DT Article
DE ;Trophoecology;Prey abundance;Mudflat;Grazing;Foraminifera;Environmental factor;Bacteria
AB The majority of sediment dweller foraminifera are deposit feeders. They use their pseudopodia to gather sediment with associated algae, organic detritus and bacteria. Uptake of bacteria by foraminifera have been observed but rarely quantified. We measured uptake of bacteria by the common foraminifera Ammonia tepida using 15N pre-enriched bacteria as tracers. In intertidal flats, seasonal, tidal and circadian cycles induce strong variations in environmental parameters. Grazing experiments were performed in order to measure effects of abiotic (temperature, salinity and irradiance) and biotic (bacterial and algal abundances) factors on uptake rates of bacteria. In mean conditions, A. tepida grazed 78 pgC ind-1 h-1 during the first eight hours of incubation, after which this uptake rate decreased. Uptake of bacteria was optimal at 30°C, decreased with salinity and was unaffected by light. Above 7 x 108 bacteria ml wt sed-1, uptake of bacteria remained unchanged when bacterial abundance increased. Algal abundance strongly affected algal uptake but did not affect uptake of bacteria. As uptake of bacteria represented 8 to 19% of microbes (algae plus bacteria) uptake, Ammonia seemed to be mainly dependant on algal resource.
PY 2008
PD APR
SO Journal of Experimental Marine Biology and Ecology
PU Elsevier
VL 359
IS 1
BP 55
EP 61
DI 10.1016/j.jembe.2008.02.018
ID 4298
ER

EF