FN Archimer Export Format
PT J
TI Foraminiferal Ecology and Role in Nitrogen Benthic Cycle in the Hypoxic Southeastern Bering Sea
BT 
AF LANGLET, Dewi
   BOUCHET, Vincent M. P.
   RISO, Riccardo
   MATSUI, Yohei
   SUGA, Hisami
   FUJIWARA, Yoshihiro
   NOMAKI, Hidetaka
AS 1:1,2;2:2;3:2;4:1;5:3;6:4;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Japan Agcy Marine Earth Sci & Technol JAMSTEC, Xstar, Yokosuka, Kanagawa, Japan.
   Univ Lille, CNRS, Univ Littoral Cote Opale, UMR 8187 LOG Lab Oceanol & Geosci,Stn Marine Wime, Lille, France.
   Japan Agcy Marine Earth Sci & Technol JAMSTEC, Res Inst Marine Resources Utilizat MRU, Yokosuka, Kanagawa, Japan.
   Japan Agcy Marine Earth Sci & Technol JAMSTEC, Res Inst Global Change RIGC, Yokosuka, Kanagawa, Japan.
C2 JAMSTEC, JAPAN
   UNIV LILLE, FRANCE
   JAMSTEC, JAPAN
   JAMSTEC, JAPAN
IN DOAJ
IF 5.247
TC 6
UR https://archimer.ifremer.fr/doc/00865/97675/106609.pdf
   https://archimer.ifremer.fr/doc/00865/97675/106610.zip
LA English
DT Article
DE ;Bering Sea;Bering canyon;ecology;benthic foraminifera;denitrification
AB Southeastern Bering Sea is one of the highest surface productivity area in the open ocean due to strong upwelling along the Bering canyon. However, the benthic geochemistry and organisms living in the area have been largely overlooked. In August 2017, surface sediment was sampled from four stations along a transect at depths between 1536 and 103 meters in the Bering canyon with JAMSTEC R/V Mirai. Bottom-water hypoxia was recorded in the two deepest stations (1536 and 536 m). At these stations, the oxygen penetrated down to 5 mm in the sediment due to siltier and much organic-rich sediments in the deeper stations while oxygen penetration was about 20 mm at stations 103 and 197 m deep with coarse-grained sediment stations. Foraminiferal number of species and abundances were higher in the Unimak pass depression station E2 (197 m). Abundance did not change significantly between stations, suggesting that foraminiferal densities are not affected by the hypoxic conditions but are rather controlled by organic matter and nutrients availability. At the upper bathyal and middle bathyal stations, living foraminiferal communities were in general dominated by Uvigerina peregrina, Nonionella pulchella, Elphidium batialis, Globobulimina pacifica, Reophax spp., and Bolivina spathulata while the shallower stations exhibited large densities of Uvigerina peregrina, Cibicidoides wuellerstorfi, Recurvoidela bradyi, Globocassidulina subglobosa, and Portatrochammina pacifica. More than 50% of the individuals have a potential to accumulate nitrate in their cell (from 3 to 648 mmol/L; which is from 100 to 4000 times larger than the highest concentration measured in pore water). Onboard denitrification measurements confirmed that B. spathulata, N. pulchella and G. pacifica could reduce nitrate through denitrification and foraminiferal denitrification could contribute over 6% to benthic nitrate reduction at the southeast Bering Sea. Although the foraminiferal contributions were smaller than those measured at other hypoxic areas, our study quantitatively revealed the significance of eukaryotic microbes on benthic nitrogen cycles at this area.
PY 2020
PD NOV
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media Sa
VL 7
UT 000585751900001
DI 10.3389/fmars.2020.582818
ID 97675
ER

EF