FN Archimer Export Format
PT J
TI Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (Haynesina germanica and Ammonia tepida)
BT 
AF JAUFFRAIS, Thierry
   JESUS, Bruno
   METZGER, Edouard
   MOUGET, Jean-Luc
   JORISSEN, Frans
   GESLIN, Emmanuelle
AS 1:1;2:2,3;3:1;4:4;5:1;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Angers, UMR CNRS LPG BIAF 6112, Bioindicateurs Actuels & Fossiles, 2 Blvd Lavoisier, F-49045 Angers 1, France.
   Univ Nantes, Lab Mer Mol Sante, EA2160, 2 Rue Houssiniere, F-44322 Nantes 3, France.
   Campo Grande Univ Lisboa, Fac Sci, BioISI Biosyst & Integrat Sci Inst, P-1749016 Lisbon, Portugal.
   Univ Maine, Lab Mer Mol Sante, EA2160, Ave O Messiaen, F-72085 Le Mans 9, France.
C2 UNIV ANGERS, FRANCE
   UNIV NANTES, FRANCE
   UNIV LISBOA, PORTUGAL
   UNIV LE MANS, FRANCE
IN DOAJ
IF 3.851
TC 43
UR https://archimer.ifremer.fr/doc/00457/56899/58754.pdf
   https://archimer.ifremer.fr/doc/00457/56899/58756.pdf
LA English
DT Article
AB Some benthic foraminifera have the ability to incorporate functional chloroplasts from diatoms (kleptoplasty). Our objective was to investigate chloroplast functionality of two benthic foraminifera (Haynesina germanica and Ammonia tepida) exposed to different irradiance levels (0, 25, 70 mot photon m(-2) s(-1)) using spectral reflectance, epifluorescence observations, oxygen evolution and pulse amplitude modulated (PAM) fluorometry (maximum photosystem II quantum efficiency (Fv/Fm) and rapid light curves (RLC)). Our results clearly showed that H. germanica was capable of using its kleptoplasts for more than 1 week while A. tepida showed very limited kleptoplastic ability with maximum photosystem II quantum efficiency (Fv/Fm = 0.4), much lower than H. germanica and decreasing to zero in only 1 day. Only H. germanica showed net oxygen production with a compensation point at 24 mmol photon m(-2) s(-1) and a production up to 1000 pmol 02 cell(-1) day(-1) at 300 mot photon m(-2) s(-1). Haynesina germanica Fv/Fm slowly decreased from 0.65 to 0.55 in 7 days when kept in darkness; however, it quickly decreased to 0.2 under high light. Kleptoplast functional time was thus estimated between 11 and 21 days in darkness and between 7 and 8 days at high light. These results emphasize that studies about foraminifera kleptoplasty must take into account light history. Additionally, this study showed that the kleptoplasts are unlikely to be completely functional, thus requiring continuous chloroplast resupply from foraminifera food source. The advantages of keeping functional chloroplasts are discussed but more information is needed to better understand foraminifera feeding strategies. 
PY 2016
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 13
IS 9
UT 000377277300007
BP 2715
EP 2726
DI 10.5194/bg-13-2715-2016
ID 56899
ER

EF