Louropoulou, Evangelia
[Author];
Gledhill, Martha
[Author];
Achterberg, Eric P.
[Author];
Browning, Thomas J.
[Author];
Honey, David J.
[Author];
Schmitz, Ruth A.
[Author];
Tagliabue, Alessandro
[Author]
Heme b distributions through the Atlantic Ocean: evidence for “anemic” phytoplankton populations
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Media type:
E-Article
Title:
Heme b distributions through the Atlantic Ocean: evidence for “anemic” phytoplankton populations
Contributor:
Louropoulou, Evangelia
[Author];
Gledhill, Martha
[Author];
Achterberg, Eric P.
[Author];
Browning, Thomas J.
[Author];
Honey, David J.
[Author];
Schmitz, Ruth A.
[Author];
Tagliabue, Alessandro
[Author]
imprint:
Nature Research, 2020-03-12
Language:
English
DOI:
https://doi.org/10.1038/s41598-020-61425-0
Origination:
Footnote:
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Description:
Heme b is an iron-containing cofactor in hemoproteins that participates in the fundamental processes of photosynthesis and respiration in phytoplankton. Heme b concentrations typically decline in waters with low iron concentrations but due to lack of field data, the distribution of heme b in particulate material in the ocean is poorly constrained. Here we report particulate heme b distributions across the Atlantic Ocean (59.9°N to 34.6°S). Heme b concentrations in surface waters ranged from 0.10 to 33.7 pmol L−1 (median = 1.47 pmol L−1, n = 974) and were highest in regions with a high biomass. The ratio of heme b to particulate organic carbon (POC) exhibited a mean value of 0.44 μmol heme b mol−1 POC. We identified the ratio of 0.10 µmol heme b mol−1 POC as the cut-off between heme b replete and heme b deficient (anemic) phytoplankton. By this definition, we observed anemic phytoplankton populations in the Subtropical South Atlantic and Irminger Basin. Comparison of observed and modelled heme b suggested that heme b could account for between 0.17–9.1% of biogenic iron. Our large scale observations of heme b relative to organic matter provide further evidence of the impact of changes in iron supply on phytoplankton iron status across the Atlantic Ocean.