Regulation of the phytoplankton heme b iron pool during the North Atlantic spring bloom

• Published in: Frontiers in Microbiology
• Main Authors: Louropoulou, E, Gledhill, M, Browning, TJ, Desai, DK, Menzel Barraqueta, J-L, Tonnard, M, Sarthou, G, Planquette, H, Bowie, AR, Schmitz, RA, LaRouche, J, Achterberg, EP
• Format: Article in Journal/Newspaper
• Language: English
• Published: Frontiers Research Foundation 2019
• Subjects: phytoplankton; heme b; iron; North Atlantic; spring bloom; Irminger Basin; Iceland; Labrador Sea
• Online Access: https://eprints.utas.edu.au/30770/; https://eprints.utas.edu.au/30770/1/133887%20-%20Regulation%20of%20the%20phytoplankton%20heme%20b%20iron%20pool%20during%20the%20North%20Atlantic%20spring%20bloom.pdf

Heme b is an iron-containing co-factor in hemoproteins. Heme b concentrations are low (-1) 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-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 μmol 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.