FN Archimer Export Format
PT J
TI Regulation of the Phytoplankton Heme b Iron Pool During the North Atlantic Spring Bloom
BT 
AF LOUROPOULOU, Evangelia
   GLEDHILL, Martha
   BROWNINGI, Thomas J.
   DESAI, Dhwani K.
   BARRAQUETA, Jan-Lukas Menzel
   TONNARD, Manon
   SARTHOU, Geraldine
   PLANQUETTE, Helene
   BOWIE, Andrew R.
   SCHMITZ, Ruth A.
   LAROCHE, Julie
   ACHTERBERG, Eric P.
AS 1:1,2;2:1;3:1;4:3;5:1,4;6:5,6,7;7:5;8:5;9:6,7;10:2;11:3;12:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;
C1 GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany.
   Christian Albrechts Univ Kiel, Inst Gen Microbiol, Kiel, Germany.
   Dalhousie Univ, Dept Biol, Halifax, NS, Canada.
   Stellenbosch Univ, Dept Earth Sci, Stellenbosch, South Africa.
   UBO, IFREMER, CNRS, UMR 6539,LEMAR,IUEM,IRD, Brest, France.
   Antarctic Climate & Ecosyst Cooperat Res Ctr, Hobart, Tas, Australia.
   Univ Tasmania, Inst Marine & Antarctic Studies, Hobart, Tas, Australia.
C2 IFM GEOMAR, GERMANY
   UNIV KIEL, GERMANY
   UNIV DALHOUSIE, CANADA
   UNIV STELLENBOSCH, SOUTH AFRICA
   CNRS, FRANCE
   ACE CRC, AUSTRALIA
   UNIV TASMANIA, AUSTRALIA
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 4.235
TC 4
UR https://archimer.ifremer.fr/doc/00508/61940/66029.pdf
   https://archimer.ifremer.fr/doc/00508/61940/66030.zip
LA English
DT Article
CR GEOVIDE
BO Pourquoi pas ?
DE ;heme b;North Atlantic;phytoplankton;diatoms;iron;limitation;GEOTRACES;GEOVIDE
AB Heme b is an iron-containing co-factor in hemoproteins. Heme b concentrations are low (< 1 pmol L-1) in iron limited phytoplankton in cultures and in the field. Here, we determined heme b in marine particulate material (> 0.7 mu m) from the North Atlantic Ocean (GEOVIDE cruise - GEOTRACES section GA01), which spanned several biogeochemical regimes. We examined the relationship between heme b abundance and the microbial community composition, and its utility for mapping iron limited phytoplankton. Heme b concentrations ranged from 0.16 to 5.1 pmol L-1 (median = 2.0 pmol L-1, n = 62) in the surface mixed layer (SML) along the cruise track, driven mainly by variability in biomass. However, in the Irminger Basin, the lowest heme b levels (SML: median = 0.53 pmol L-1, n = 12) were observed, whilst the biomass was highest (particulate organic carbon, median = 14.2 mu mol L-1, n = 25; chlorophyll a: median = 2.0 nmol L-1, n = 23) pointing to regulatory mechanisms of the heme b pool for growth conservation. Dissolved iron (DFe) was not depleted (SML: median = 0.38 nmol L-1, n = 11) in the Irminger Basin, but large diatoms (Rhizosolenia sp.) dominated. Hence, heme b depletion and regulation is likely to occur during bloom progression when phytoplankton class-dependent absolute iron requirements exceed the available ambient concentration of DFe. Furthermore, high heme b concentrations found in the Iceland Basin and Labrador Sea (median = 3.4 pmol L-1, n = 20), despite having similar DFe concentrations to the Irminger Basin, were attributed to an earlier growth phase of the extant phytoplankton populations. Thus, heme b provides a snapshot of the cellular activity in situ and could both be used as indicator of iron limitation and contribute to understanding phytoplankton adaptation mechanisms to changing iron supplies.
PY 2019
PD JUN
SO Frontiers In Microbiology
SN 1664-302X
PU Frontiers Media Sa
VL 10
IS 1566
UT 000474926600001
DI 10.3389/fmicb.2019.01566
ID 61940
ER

EF