Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom
CITATION: Louropoulou, E., et al. 2019. Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom. Frontiers in Microbiology, 10:1566, doi:10.3389/fmicb.2019.01566. The original publication is available at https://www.frontiersin.org Heme b is an iron-containing co-fact...
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Online Access: | http://hdl.handle.net/10019.1/123348 https://doi.org/10.3389/fmicb.2019.01566 |
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ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/123348 2024-02-11T10:05:15+01:00 Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom Louropoulou, Evangelia Gledhill, Martha Browning, 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. 2019-07-11 16 pages : illustrations application/pdf http://hdl.handle.net/10019.1/123348 https://doi.org/10.3389/fmicb.2019.01566 en_ZA eng Frontiers Media Louropoulou, E., et al. 2019. Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom. Frontiers in Microbiology, 10:1566, doi:10.3389/fmicb.2019.01566 1664-302X (online) doi:10.3389/fmicb.2019.01566 http://hdl.handle.net/10019.1/123348 Authors retain copyright Heme b Hemoproteins Phytoplankton populations Iron -- Analysis Diatoms -- North Atlantic Article 2019 ftunstellenbosch https://doi.org/10.3389/fmicb.2019.01566 2024-01-23T01:31:30Z CITATION: Louropoulou, E., et al. 2019. Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom. Frontiers in Microbiology, 10:1566, doi:10.3389/fmicb.2019.01566. The original publication is available at https://www.frontiersin.org Heme b is an iron-containing co-factor in hemoproteins. Heme b concentrations are low (<1 pmol L⁻²) in iron limited phytoplankton in cultures and in the field. Here, we determined heme b in marine particulate material (>0.7 μm) 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⁻² (median = 2.0 pmol L⁻², 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⁻², n = 12) were observed, whilst the biomass was highest (particulate organic carbon, median = 14.2 μmol L⁻², n = 25; chlorophyll a: median = 2.0 nmol L⁻², 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⁻², 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⁻², 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 ... Article in Journal/Newspaper Iceland Labrador Sea North Atlantic Stellenbosch University: SUNScholar Research Repository Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Frontiers in Microbiology 10 |
institution |
Open Polar |
collection |
Stellenbosch University: SUNScholar Research Repository |
op_collection_id |
ftunstellenbosch |
language |
English |
topic |
Heme b Hemoproteins Phytoplankton populations Iron -- Analysis Diatoms -- North Atlantic |
spellingShingle |
Heme b Hemoproteins Phytoplankton populations Iron -- Analysis Diatoms -- North Atlantic Louropoulou, Evangelia Gledhill, Martha Browning, 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. Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom |
topic_facet |
Heme b Hemoproteins Phytoplankton populations Iron -- Analysis Diatoms -- North Atlantic |
description |
CITATION: Louropoulou, E., et al. 2019. Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom. Frontiers in Microbiology, 10:1566, doi:10.3389/fmicb.2019.01566. The original publication is available at https://www.frontiersin.org Heme b is an iron-containing co-factor in hemoproteins. Heme b concentrations are low (<1 pmol L⁻²) in iron limited phytoplankton in cultures and in the field. Here, we determined heme b in marine particulate material (>0.7 μm) 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⁻² (median = 2.0 pmol L⁻², 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⁻², n = 12) were observed, whilst the biomass was highest (particulate organic carbon, median = 14.2 μmol L⁻², n = 25; chlorophyll a: median = 2.0 nmol L⁻², 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⁻², 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⁻², 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 ... |
format |
Article in Journal/Newspaper |
author |
Louropoulou, Evangelia Gledhill, Martha Browning, 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. |
author_facet |
Louropoulou, Evangelia Gledhill, Martha Browning, 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. |
author_sort |
Louropoulou, Evangelia |
title |
Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom |
title_short |
Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom |
title_full |
Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom |
title_fullStr |
Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom |
title_full_unstemmed |
Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom |
title_sort |
regulation of the phytoplankton heme b iron pool during the north atlantic spring bloom |
publisher |
Frontiers Media |
publishDate |
2019 |
url |
http://hdl.handle.net/10019.1/123348 https://doi.org/10.3389/fmicb.2019.01566 |
long_lat |
ENVELOPE(-36.000,-36.000,61.000,61.000) |
geographic |
Irminger Basin |
geographic_facet |
Irminger Basin |
genre |
Iceland Labrador Sea North Atlantic |
genre_facet |
Iceland Labrador Sea North Atlantic |
op_relation |
Louropoulou, E., et al. 2019. Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom. Frontiers in Microbiology, 10:1566, doi:10.3389/fmicb.2019.01566 1664-302X (online) doi:10.3389/fmicb.2019.01566 http://hdl.handle.net/10019.1/123348 |
op_rights |
Authors retain copyright |
op_doi |
https://doi.org/10.3389/fmicb.2019.01566 |
container_title |
Frontiers in Microbiology |
container_volume |
10 |
_version_ |
1790602159484567552 |