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 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, pb did not correlate with chl a in the IB...

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Bibliographic Details
Published in:Global Biogeochemical Cycles
Main Authors: Gledhill, Martha, Achterberg, Eric P., Honey, David J., Nielsdottir, Maria C., Rijkenberg, Micha J.A.
Format: Article in Journal/Newspaper
Language:unknown
Published: ODU Digital Commons 2013
Subjects:
Iron
Phytoplankton
Physiology
Nutrients
Biogenic particulate material
Atlantic Ocean
Microplankton community structure
Scotia sea
Iron availability
Tetrapyrrole biosynthesis
Marine phytoplankton
North atlantic
Spring bloom
Photosynthesis
Diatom
Dust
Biochemistry
Geology
Oceanography and Atmospheric Sciences and Meteorology
Scotia Sea
North Atlantic
Online Access:https://digitalcommons.odu.edu/oeas_fac_pubs/263
https://doi.org/10.1002/2013gb004639
https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1271/viewcontent/Nielsdottir2013DistributionsofparticulateHemebintheAtlanticOCR.pdf
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Summary:Concentrations of heme b, the iron-containing component of b-type hemoproteins, ranged from 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, pb 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 bconcentrations relative to particulate organic carbon (< 0.1 μmolmol-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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