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Distributions of particulate Heme b in the Atlantic and Southern Oceans - implications for electron transport in phytoplankton

Distributions of particulate Heme b in the Atlantic and Southern Oceans - implications for electron transport in phytoplankton
Distributions of particulate Heme b in the Atlantic and Southern Oceans - implications for electron transport in phytoplankton
Concentrations of heme b, the iron-containing component of b-type hemoproteins, ranged from?<?0.4 to 5.3 pM with an average of 1.18?±?0.8 pM (± 1?; n?=?86) in the Iceland Basin (IB), from?<?0.4 to 19.1 pM with an average of 2.24?±?1.67 pM (n?=?269) in the tropical northeast Atlantic (TNA) and from 0.6 to 21 pM with an average of 5.1?±?4.8 pM (n?=?34) in the Scotia Sea (SS). Heme b concentrations were enhanced in the photic zone and decreased with depth. Heme b concentrations correlated positively with chlorophyll a (chl a) in the TNA (r?=?0.41, p?<?0.01, n?=?269). Heme b did not correlate with chl a in the IB or SS. In the IB and SS, stations with high-chlorophyll and low-nutrient (Fe and/or Si) concentrations exhibited low heme b concentrations relative to particulate organic carbon (< 0.1??mol?mol?1), and high chl a:heme b ratios (> 500). High chl a:heme b ratios resulted from relative decreases in heme b, suggesting proteins such as cytochrome b6f, the core complex of photosystem II, and eukaryotic nitrate reductase were depleted relative to proteins containing chlorophyll such as the eukaryotic light-harvesting antenna. Relative variations in heme b, particulate organic carbon, and chl a can thus be indicative of a physiological response of the phytoplankton community to the prevailing growth conditions, within the context of large-scale changes in phytoplankton community composition.
iron, phytoplankton, physiology, nutrients, biogenic particulate material, atlantic ocean
0886-6236
1072-1082
Gledhill, Martha
da795c1e-1489-4d40-9df1-fc6bde54382d
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Honey, David J.
7aec4239-185a-416e-b32b-6ac057dc7cd8
Nielsdottir, Maria C.
7b1f99e9-79cc-4d73-a46f-5e231c3fcbad
Rijkenberg, Micha J.A.
549cc6d0-6f1a-432f-863a-2988abcb25d3
Gledhill, Martha
da795c1e-1489-4d40-9df1-fc6bde54382d
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Honey, David J.
7aec4239-185a-416e-b32b-6ac057dc7cd8
Nielsdottir, Maria C.
7b1f99e9-79cc-4d73-a46f-5e231c3fcbad
Rijkenberg, Micha J.A.
549cc6d0-6f1a-432f-863a-2988abcb25d3

Gledhill, Martha, Achterberg, Eric P., Honey, David J., Nielsdottir, Maria C. and Rijkenberg, Micha J.A. (2013) Distributions of particulate Heme b in the Atlantic and Southern Oceans - implications for electron transport in phytoplankton. Global Biogeochemical Cycles, 27 (4), 1072-1082. (doi:10.1002/2013GB004639).

Record type: Article

Abstract

Concentrations of heme b, the iron-containing component of b-type hemoproteins, ranged from?<?0.4 to 5.3 pM with an average of 1.18?±?0.8 pM (± 1?; n?=?86) in the Iceland Basin (IB), from?<?0.4 to 19.1 pM with an average of 2.24?±?1.67 pM (n?=?269) in the tropical northeast Atlantic (TNA) and from 0.6 to 21 pM with an average of 5.1?±?4.8 pM (n?=?34) in the Scotia Sea (SS). Heme b concentrations were enhanced in the photic zone and decreased with depth. Heme b concentrations correlated positively with chlorophyll a (chl a) in the TNA (r?=?0.41, p?<?0.01, n?=?269). Heme b did not correlate with chl a in the IB or SS. In the IB and SS, stations with high-chlorophyll and low-nutrient (Fe and/or Si) concentrations exhibited low heme b concentrations relative to particulate organic carbon (< 0.1??mol?mol?1), and high chl a:heme b ratios (> 500). High chl a:heme b ratios resulted from relative decreases in heme b, suggesting proteins such as cytochrome b6f, the core complex of photosystem II, and eukaryotic nitrate reductase were depleted relative to proteins containing chlorophyll such as the eukaryotic light-harvesting antenna. Relative variations in heme b, particulate organic carbon, and chl a can thus be indicative of a physiological response of the phytoplankton community to the prevailing growth conditions, within the context of large-scale changes in phytoplankton community composition.

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e-pub ahead of print date: 12 November 2013
Published date: December 2013
Keywords: iron, phytoplankton, physiology, nutrients, biogenic particulate material, atlantic ocean
Organisations: Ocean and Earth Science

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Local EPrints ID: 361693
URI: http://eprints.soton.ac.uk/id/eprint/361693
ISSN: 0886-6236
PURE UUID: dcf24e4c-ff3f-4d33-ba98-fd8525c47e07

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Date deposited: 30 Jan 2014 11:02
Last modified: 08 Jan 2022 03:05

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Contributors

Author: Martha Gledhill
Author: David J. Honey
Author: Maria C. Nielsdottir
Author: Micha J.A. Rijkenberg

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