FN Archimer Export Format
PT J
TI Elemental content allometries and silicon uptake rates of planktonic Rhizaria: Insights into their ecology and role in biogeochemical cycles
BT 
AF Laget, Manon
   Llopis‐Monferrer, Natalia
   Maguer, Jean‐François
   Leynaert, Aude
   Biard, Tristan
AS 1:1;2:2;3:2;4:2;5:1;
FF 1:;2:;3:;4:;5:;
C1 LOG, Laboratoire d'Océanologie et de Géosciences Université du Littoral Côte d'Opale, Université de Lille, CNRS, IRD, UMR 8187 Wimereux ,France
   Université de Brest, CNRS, IRD, Ifremer, LEMAR Plouzané ,France
C2 UNIV LITTORAL COTE D'OPALE, FRANCE
   CNRS, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 4.5
TC 1
UR https://archimer.ifremer.fr/doc/00809/92117/98093.pdf
   https://archimer.ifremer.fr/doc/00809/92117/98094.pdf
LA English
DT Article
AB The last two decades have shown the importance of Rhizaria in the biogeochemical cycles of carbon and silicon in modern oceans. This eukaryotic supergroup, which includes Radiolaria and Phaeodaria, represents an important part of zooplanktonic carbon biomass and contributes to carbon and silica export. Still, accurate estimations of their carbon biomass are hindered by poor knowledge of their elemental composition, contrasting with well-established allometric carbon-to-volume relationships for smaller protists such as phytoplankton. Here, we directly measured carbon, nitrogen, and biogenic silica content as well as silicon uptake rates of planktonic Rhizaria. We highlight that size can be used as a predictor of elemental content for a broad variety of planktonic Rhizaria ranging from 200 μm to several mm, whereas size is weakly correlated with silicon uptake rates. Our results indicate that the scaling exponent of the carbon-to-volume allometry is significantly lower than those for smaller protists, underlining the low carbon strategy of these organisms. Still, we show that carbon and nitrogen densities span over four orders of magnitude, possibly accounting for the differences in depth ranges, nutritional modes and colonial or solitary forms. We estimate Rhizaria sinking speeds by combining carbon, nitrogen, and silica content data and show that great variability exists among the different taxa. Besides giving a better understanding of rhizarian ecology and biogeochemistry, these analyses, at the individual scale, are a first step to subsequent biomass and flux estimations at larger scales. 
PY 2023
PD FEB
SO Limnology And Oceanography
SN 0024-3590
PU Wiley
VL 68
IS 2
UT 000894804500001
BP 439
EP 454
DI 10.1002/lno.12284
ID 92117
ER

EF