Aiken, G.R., H. Hsu-Kim, and J.N. Ryan. 2011. Influence of dissolved organic matter on the environmental fate of metals, nanoparticles, and colloids. Environmental Science & Technology 45(8):3,196–3,201, https://doi.org/10.1021/es103992s.
Ardiningsih, I., K. Zhu, P. Lodeiro, M. Gledhill, G.-J. Reichart, E.P. Achterberg, R. Middag, and L.J.A. Gerringa. 2021. Iron speciation in Fram Strait and over the northeast Greenland shelf: An inter-comparison study of voltammetric methods. Frontiers in Marine Science 7:609379, https://doi.org/10.3389/fmars.2020.609379.
Aristilde, L., Y. Xu, and F.M.M. Morel. 2012. Weak organic ligands enhance zinc uptake in marine phytoplankton. Environmental Science & Technology 46(10):5,438–5,445, https://doi.org/10.1021/es300335u.
Arnone, V., J.M. Santana-Casiano, M. González-Dávila, H. Planquette, G. Sarthou, L.J.A. Gerringa, and A.G. Gonzalez. 2023. Natural copper-binding ligands in the Arctic Ocean. The influence of the Transpolar Drift (GEOTRACES GN04). Frontiers in Marine Science 10:1306278, https://doi.org/10.3389/fmars.2023.1306278.
Arnone, V., J.M. Santana-Casiano, M. González-Dávila, G. Sarthou, S. Krisch, P. Lodeiro, E.P. Achterberg, and A.G. González. 2024. Distribution of copper-binding ligands in Fram Strait and influences from the Greenland Shelf (GEOTRACES GN05). Science of the Total Environment 909:168162, https://doi.org/10.1016/j.scitotenv.2023.168162.
Arreguin, M., A. González, N. Pérez-Almeida, V. Arnone, M. González-Dávila, and J.M. Santana-Casiano. 2021. The role of gentisic acid on the Fe(III) redox chemistry in marine environments. Marine Chemistry 234:104003, https://doi.org/10.1016/j.marchem.2021.104003.
Avendaño, L., M. Gledhill, E.P. Achterberg, V.M.C. Rérolle, and C. Schlosser. 2016. Influence of ocean acidification on the organic complexation of iron and copper in northwest European shelf seas: A combined observational and model study. Frontiers in Marine Science 3:58, https://doi.org/10.3389/fmars.2016.00058
Baars, O., and P.L. Croot. 2011. The speciation of dissolved zinc in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: 58(25–26):2,720–2,732, https://doi.org/10.1016/j.dsr2.2011.02.003.
Baars, O., W. Abouchami, S.J.G. Galer, M. Boye, and P.L. Croot. 2014. Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate. Limnology and Oceanography 59(2):385–399, https://doi.org/10.4319/lo.2014.59.2.0385.
Baars, O., and P.L. Croot. 2015. Dissolved cobalt speciation and reactivity in the eastern tropical North Atlantic. Marine Chemistry 173:310–319, https://doi.org/10.1016/j.marchem.2014.10.006.
Babcock-Adams, L. 2022. Molecular Characterization of Organically Bound Copper in the Marine Environment. PhD dissertation, Massachusetts Institute of Technology, 155 pp., https://dspace.mit.edu/bitstream/handle/1721.1/150438/babcockadams-lydiaba-phd-eaps-2022-thesis.pdf?sequence=1&isAllowed=y.
Barbeau, K., E.L. Rue, K.W. Bruland, and A. Butler. 2001. Photochemical cycling of iron in the surface ocean mediated by microbial iron(iii)-binding ligands. Nature 413:409–413, https://doi.org/10.1038/35096545.
Basu, S., M. Gledhill, D. de Beer, S.G. Prabhu Matondkar, and Y. Shaked. 2019. Colonies of marine cyanobacteria Trichodesmium interact with associated bacteria to acquire iron from dust. Communications Biology 2:284, https://doi.org/10.1038/s42003-019-0534-z.
Boiteau, R.M., D.R. Mende, N.J. Hawco, M.R. McIlvin, J.N. Fitzsimmons, M.A. Saito, P.N. Sedwick, E.F. DeLong, and D.J. Repeta. 2016a. Siderophore-based microbial adaptations to iron scarcity across the eastern Pacific Ocean. Proceedings of the National Academy of Sciences of the United States of America 113(50):14,237–14,242, https://doi.org/10.1073/pnas.1608594113.
Boiteau, R.M., C.P. Till, A. Ruacho, R.M. Bundy, N.J. Hawco, A.M. McKenna, K.A. Barbeau, K.W. Bruland, M.A. Saito, and D.J. Repeta. 2016b. Structural characterization of natural nickel and copper binding ligands along the US GEOTRACES Eastern Pacific Zonal Transect. Frontiers in Marine Science 3:243, https://doi.org/10.3389/fmars.2016.00243.
Boiteau, R.M., J.B. Shaw, L. Pasa-Tolic, D.W. Koppenaal, and J.K. Jansson. 2018. Micronutrient metal speciation is controlled by competitive organic chelation in grassland soils. Soil Biology and Biochemistry 120:283–291, https://doi.org/10.1016/j.soilbio.2018.02.018.
Boiteau, R.M., C.P. Till, T.H. Coale, J.N. Fitzsimmons, K.W. Bruland, and D.J. Repeta. 2019. Patterns of iron and siderophore distributions across the California Current System. Limnology and Oceanography 64(1):376–389, https://doi.org/10.1002/lno.11046.
Borer, P.M., B. Sulzberger, P. Reichard, and S.M. Kraemer. 2005. Effect of siderophores on the light-induced dissolution of colloidal iron(III) (hydr) oxides. Marine Chemistry 93(2–4):179–193, https://doi.org/10.1016/j.marchem.2004.08.006.
Boyd, P.W., and M.J. Ellwood. 2010. The biogeochemical cycle of iron in the ocean. Nature Geoscience 3:675, https://doi.org/10.1038/ngeo964.
Boye, M., J. Nishioka, P. Croot, P. Laan, K.R. Timmermans, V.H. Strass, S. Takeda, and H.J.W. de Baar. 2010. Significant portion of dissolved organic Fe complexes in fact is Fe colloids. Marine Chemistry 122(1–4):20–27, https://doi.org/10.1016/j.marchem.2010.09.001.
Bressac, M., and C. Guieu. 2013. Post-depositional processes: What really happens to new atmospheric iron in the ocean’s surface? Global Biogeochemical Cycles 27(3):859–870, https://doi.org/10.1002/gbc.20076.
Bruland, K.W. 1992. Complexation of cadmium by natural organic ligands in the central North Pacific. Limnology and Oceanography 37(5):1,008–1,017, https://doi.org/10.4319/lo.1992.37.5.1008.
Bruland, K.W., E.L. Rue, J.R. Donat, S.A. Skrabal, and J.W. Moffett. 2000. Intercomparison of voltammetric techniques to determine the chemical speciation of dissolved copper in a coastal seawater sample. Analytica Chimica Acta 405(1–2):99–113, https://doi.org/10.1016/S0003-2670(99)00675-3.
Buck, K.N., M.C. Lohan, C.J.M. Berger, and K.W. Bruland. 2007. Dissolved iron speciation in two distinct river plumes and an estuary: Implications for riverine iron supply. Limnology and Oceanography 52(2):843–855, https://doi.org/10.4319/lo.2007.52.2.0843.
Buck, K.N., J. Moffett, K.A. Barbeau, R.M. Bundy, Y. Kondo, and J.F. Wu. 2012. The organic complexation of iron and copper: An intercomparison of competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-ACSV) techniques. Limnology and Oceanography-Methods 10:496–515, https://doi.org/10.4319/lom.2012.10.496.
Buck, K.N., B. Sohst, and P.N. Sedwick. 2015. The organic complexation of dissolved iron along the U.S. GEOTRACES (GA03) North Atlantic Section. Deep Sea Research Part II 116:152–165, https://doi.org/10.1016/j.dsr2.2014.11.016.
Buck, K.N., L.J.A. Gerringa, and M.J.A. Rijkenberg. 2016. An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station A. Frontiers in Marine Science 3:262, https://doi.org/10.3389/fmars.2016.00262.
Buck, K.N., P.N. Sedwick, B. Sohst, and C.A. Carlson. 2018. Organic complexation of iron in the eastern tropical South Pacific: Results from US GEOTRACES Eastern Pacific Zonal Transect (GEOTRACES cruise GP16). Marine Chemistry 201:229–241, https://doi.org/10.1016/j.marchem.2017.11.007.
Bundy, R.M., R.M. Boiteau, C. McLean, K.A. Turk-Kubo, M.R. McIlvin, M.A. Saito, B.A.S. Van Mooy, and D.J. Repeta. 2018. Distinct siderophores contribute to iron cycling in the mesopelagic at station ALOHA. Frontiers in Marine Science 5:61, https://doi.org/10.3389/fmars.2018.00061.
Bundy, R.M., A. Tagliabue, N.J. Hawco, P.L. Morton, B.S. Twining, M. Hatta, A.E. Noble, M.R. Cape, S.G. John, J.T. Cullen, and M.A. Saito. 2020. Elevated sources of cobalt in the Arctic Ocean. Biogeosciences 17(19):4,745–4,767, https://doi.org/10.5194/bg-17-4745-2020.
Cabanes, D.J.E., L. Norman, A.R. Bowie, S. Strmečki, and C.S. Hassler. 2020. Electrochemical evaluation of iron-binding ligands along the Australian GEOTRACES southwestern Pacific section (GP13). Marine Chemistry 219:103736, https://doi.org/10.1016/j.marchem.2019.103736.
Chmiel, R., N. Lanning, A. Laubach, J.-M. Lee, J. Fitzsimmons, M. Hatta, W. Jenkins, P. Lam, M. McIlvin, A. Tagliabue, and M. Saito. 2022. Major processes of the dissolved cobalt cycle in the North and equatorial Pacific Ocean. Biogeosciences 19(9):2,365–2,395, https://doi.org/10.5194/bg-19-2365-2022.
Coale, T.H., M. Moosburner, A. Horák, M. Oborník, K.A. Barbeau, and A.E. Allen. 2019. Reduction-dependent siderophore assimilation in a model pennate diatom. Proceedings of the National Academy of Sciences of the United States of America 116(47):23,609–23,617, https://doi.org/10.1073/pnas.1907234116.
Croot, P.L., and M. Johansson. 2000. Determination of iron speciation by cathodic stripping voltammetry in seawater using the competing ligand 2-(2-Thiazolylazo)-p-cresol (TAC). Electroanalysis 12(8):565–576, https://doi.org/10.1002/(SICI)1521-4109(200005)12:8<565::AID-ELAN565>3.0.CO;2-L.
Curti, L., O.W. Moore, P. Babakhani, K.-Q. Xiao, C. Woulds, A.W. Bray, B.J. Fisher, M. Kazemian, B. Kaulich, and C.L. Peacock. 2021. Carboxyl-richness controls organic carbon preservation during coprecipitation with iron (oxyhydr)oxides in the natural environment. Communications Earth & Environment 2(1):229, https://doi.org/10.1038/s43247-021-00301-9.
Cutter, G.A., K.A. Casciotti, P. Croot, W. Geibert, L.-E. Heimbürger, M. Lohan, H. Planquette, and T. van de Flierdt. 2017. Sampling and sample-handling protocols for GEOTRACES cruises. Version 3, August 2017, Toulouse, France, GEOTRACES International Project Office, 139 pp., https://doi.org/10.25607/OBP-2.
Dittmar, T., and A. Stubbins. 2014. Dissolved organic matter in aquatic systems. Pp. 125–156 in Treatise on Geochemistry, 2nd ed. Elsevier, https://doi.org/10.1016/B978-0-08-095975-7.01010-X.
Dulaquais, G., H. Planquette, S. l’Helguen, M.J. Rijkenberg, and M. Boye. 2017. The biogeochemistry of cobalt in the Mediterranean Sea. Global Biogeochemical Cycles 31(2):377–399, https://doi.org/10.1002/2016GB005478.
Dulaquais, G., M. Waeles, L.J.A. Gerringa, R. Middag, M.J.A. Rijkenberg, and R. Riso. 2018. The biogeochemistry of electroactive humic substances and its connection to iron chemistry in the North East Atlantic and the Western Mediterranean Sea. Journal of Geophysical Research: Oceans 123(8):5,481–5,499, https://doi.org/10.1029/2018JC014211.
Dulaquais, G., P. Fourrier, C. Guieu, L. Mahieu, R. Riso, P. Salaun, C. Tilliette, and H. Whitby. 2023. The role of humic-type ligands in the bioavailability and stabilization of dissolved iron in the western tropical South Pacific Ocean. Frontiers in Marine Science 10:1219594, https://doi.org/10.3389/fmars.2023.1219594.
Eichner, M., S. Basu, M. Gledhill, D. de Beer, and Y. Shaked. 2019. Hydrogen dynamics in Trichodesmium colonies and their potential role in mineral iron acquisition. Frontiers in Microbiology 10:1565, https://doi.org/10.3389/fmicb.2019.01565.
Ellwood, M.J., and C.M.G. van den Berg. 2001. Determination of organic complexation of cobalt in seawater by cathodic stripping voltammetry. Marine Chemistry 75(1–2):33–47, https://doi.org/10.1016/S0304-4203(01)00024-X.
Ellwood, M.J. 2004. Zinc and cadmium speciation in subantarctic waters east of New Zealand. Marine Chemistry 87(1–2):37–58, https://doi.org/10.1016/j.marchem.2004.01.005.
Fitzsimmons, J.N., and E.A. Boyle. 2014. Both soluble and colloidal iron phases control dissolved iron variability in the tropical North Atlantic Ocean. Geochimica et Cosmochimica Acta 125:539–550, https://doi.org/10.1016/j.gca.2013.10.032.
Fitzsimmons, J.N., G.G. Carrasco, J. Wu, S. Roshan, M. Hatta, C.I. Measures, T.M. Conway, S.G. John, and E.A. Boyle. 2015a. Partitioning of dissolved iron and iron isotopes into soluble and colloidal phases along the GA03 GEOTRACES North Atlantic Transect. Deep Sea Research Part II 116:130–151, https://doi.org/10.1016/j.dsr2.2014.11.014.
Fitzsimmons, J.N., C.T. Hayes, S.N. Al-Subiai, R. Zhang, P.L. Morton, R.E. Weisend, F. Ascani, and E.A. Boyle. 2015b. Daily to decadal variability of size-fractionated iron and iron-binding ligands at the Hawaii Ocean Time-series Station ALOHA. Geochimica et Cosmochimica Acta 171:303–324, https://doi.org/10.1016/j.gca.2015.08.012.
Fourquez, M., D.J. Janssen, T.M. Conway, D. Cabanes, M.J. Ellwood, M. Sieber, S. Trimborn, and C. Hassler. 2023. Chasing iron bioavailability in the Southern Ocean: Insights from Phaeocystis antarctica and iron speciation. Science Advances 9(26):eadf9696, https://doi.org/10.1126/sciadv.adf9696.
Fourrier, P., G. Dulaquais, C. Guigue, P. Giamarchi, G. Sarthou, H. Whitby, and R. Riso. 2022. Characterization of the vertical size distribution, composition and chemical properties of dissolved organic matter in the (ultra)oligotrophic Pacific Ocean through a multi-detection approach. Marine Chemistry 240:104068, https://doi.org/10.1016/j.marchem.2021.104068.
Gao, Z., and C. Guéguen. 2018. Distribution of thiol, humic substances and colored dissolved organic matter during the 2015 Canadian Arctic GEOTRACES cruises. Marine Chemistry 203:1–9, https://doi.org/10.1016/j.marchem.2018.04.001.
Genovese, C., M. Grotti, J. Pittaluga, F. Ardini, J. Janssens, K. Wuttig, S. Moreau, and D. Lannuzel. 2018. Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice. Marine Chemistry 203:28–37, https://doi.org/10.1016/j.marchem.2018.04.005.
Genovese, C., M. Grotti, F. Ardini, K. Wuttig, D. Vivado, D. Cabanes, A. Townsend, C. Hassler, and D. Lannuzel. 2022. Effect of salinity and temperature on the determination of dissolved iron-binding organic ligands in the polar marine environment. Marine Chemistry 238:104051, https://doi.org/10.1016/j.marchem.2021.104051.
GEOTRACES Planning Group. 2006. GEOTRACES Science Plan. Scientific Committee on Oceanic Research, Baltimore, MD, 79 pp., https://geotracesold.sedoo.fr/libraries/documents/Science_plan.pdf.
Gerringa, L.J.A., M.J.A. Rijkenberg, V. Schoemann, P. Laan, and H.J.W. de Baar. 2015. Organic complexation of iron in the West Atlantic Ocean. Marine Chemistry 177:434–446, https://doi.org/10.1016/j.marchem.2015.04.007.
Gerringa, L.J.A., M. Gledhill, I. Ardiningsih, N. Muntjewerf, and L.M. Laglera. 2021. Comparing CLE-AdCSV applications using SA and TAC to determine the Fe-binding characteristics of model ligands in seawater. Biogeosciences 18(19):5,265–5,289, https://doi.org/10.5194/bg-18-5265-2021.
Gledhill, M., and K.N. Buck. 2012. The organic complexation of iron in the marine environment: A review. Frontiers in Microbiology 3:69, https://doi.org/10.3389/fmicb.2012.00069.
Gledhill, M., A. Hollister, M. Seidel, K. Zhu, E.P. Achterberg, T. Dittmar, and A. Koschinsky. 2022a. Trace metal stoichiometry of dissolved organic matter in the Amazon plume. Science Advances 8(31):eabm2249, https://doi.org/10.1126/sciadv.abm2249.
Gledhill, M., K. Zhu, D. Rusiecka, and E.P. Achterberg. 2022b. Competitive interactions between microbial siderophores and humic-like binding sites in European shelf sea waters. Frontiers in Marine Science 9:855009, https://doi.org/10.3389/fmars.2022.855009.
González, A.G., J.M. Santana-Casiano, M. González-Dávila, and N. Pérez. 2012. Effect of organic exudates of Phaeodactylum tricornutum on the Fe(II) oxidation rate constant. Ciencias Marinas 38(1B):245–261, https://doi.org/10.7773/cm.v38i1B.1808.
González, A.G., M.I. Cadena-Aizaga, G. Sarthou, M. González-Dávila, and J.M. Santana-Casiano. 2019. Iron complexation by phenolic ligands in seawater. Chemical Geology 511:380–388, https://doi.org/10.1016/j.chemgeo.2018.10.017.
González-Santana, D., A.J. Lough, H. Planquette, G. Sarthou, A. Tagliabue, and M.C. Lohan. 2023. The unaccounted dissolved iron(II) sink: Insights from dFe(II) concentrations in the deep Atlantic Ocean. Science of the Total Environment 862:161179, https://doi.org/10.1016/j.scitotenv.2022.161179.
Guo, J., A.L. Annett, R.L. Taylor, S. Lapi, T.J. Ruth, and M.T. Maldonado. 2010. Copper-uptake kinetics of coastal and oceanic diatoms. Journal of Phycology 46(6):1,218–1,228, https://doi.org/10.1111/j.1529-8817.2010.00911.x.
Hansen, C.T., C. Kleint, S. Böhnke, L. Klose, N. Adam-Beyer, K. Sass, R. Zitoun, S.G. Sander, D. Indenbirken, and T. Dittmar, and others. 2022. Impact of high Fe-concentrations on microbial community structure and dissolved organics in hydrothermal plumes: An experimental study. Scientific Reports 12(1):20723, https://doi.org/10.1038/s41598-022-25320-0.
Hassler, C.S., V. Schoemann, C.M. Nichols, E.C.V. Butler, and P.W. Boyd. 2011. Saccharides enhance iron bioavailability to Southern Ocean phytoplankton. Proceedings of the National Academy of Sciences of the United States of America 108(3):1,076–1,081, https://doi.org/10.1073/pnas.1010963108.
Hassler, C.S., F.-E. Legiret, and E.C.V. Butler. 2013. Measurement of iron chemical speciation in seawater at 4°C: The use of competitive ligand exchange–adsorptive cathodic stripping voltammetry. Marine Chemistry 149:63–73, https://doi.org/10.1016/j.marchem.2012.12.007.
Hassler, C.S., L. Norman, C.A. Mancuso Nichols, L.A. Clementson, C. Robinson, V. Schoemann, R.J. Watson, and M.A. Doblin. 2015. Iron associated with exopolymeric substances is highly bioavailable to oceanic phytoplankton. Marine Chemistry 173:136–147, https://doi.org/10.1016/j.marchem.2014.10.002.
Hassler, C.S., C.M.G. van den Berg, and P.W. Boyd. 2017. Toward a regional classification to provide a more inclusive examination of the ocean biogeochemistry of iron-binding ligands. Frontiers in Marine Science 4:19, https://doi.org/10.3389/fmars.2017.00019.
Hassler, C., D. Cabanes, S. Blanco-Ameijeiras, S.G. Sander, and R. Benner. 2020. Importance of refractory ligands and their photodegradation for iron oceanic inventories and cycling. Marine and Freshwater Research 71(3):311–320, https://doi.org/10.1071/MF19213.
Hawco, N.J., D.C. Ohnemus, J.A. Resing, B.S. Twining, and M.A. Saito. 2016. A dissolved cobalt plume in the oxygen minimum zone of the eastern tropical South Pacific. Biogeosciences 13(20):5,697–5,717, https://doi.org/10.5194/bg-13-5697-2016.
Heller, M.I., D.M. Gaiero, and P.L. Croot. 2013. Basin scale survey of marine humic fluorescence in the Atlantic: Relationship to iron solubility and H2O2. Global Biogeochemical Cycles 27(1):88–100, https://doi.org/10.1029/2012GB004427.
Hertkorn, N., M. Harir, B.P. Koch, B. Michalke, and P. Schmitt-Kopplin. 2013. High-field NMR spectroscopy and FTICR mass spectrometry: Powerful discovery tools for the molecular level characterization of marine dissolved organic matter. Biogeosciences 10(3):1,583–1,624, https://doi.org/10.5194/bg-10-1583-2013.
Hiemstra, T., and W.H. van Riemsdijk. 2006. Biogeochemical speciation of Fe in ocean water. Marine Chemistry 102(3–4):181–197, https://doi.org/10.1016/j.marchem.2006.03.008.
Hogle, S.L., T. Hackl, R.M. Bundy, J. Park, B. Satinsky, T. Hiltunen, S. Biller, P.M. Berube, and S.W. Chisholm. 2022. Siderophores as an iron source for picocyanobacteria in deep chlorophyll maximum layers of the oligotrophic ocean. The ISME Journal 16(6):1,636–1,646, https://doi.org/10.1038/s41396-022-01215-w.
Homoky, W.B., T.M. Conway, S.G. John, D. König, F. Deng, A. Tagliabue, and R.A. Mills. 2021. Iron colloids dominate sedimentary supply to the ocean interior. Proceedings of the National Academy of Sciences of the United States of America 118(13):e2016078118, https://doi.org/10.1073/pnas.2016078118.
Hudson, R.J., and F.M. Morel. 1990. lron transport in marine phytoplankton: Kinetics of cellular and medium coordination reactions. Limnology and Oceanography 35(5):1,002–1,020, https://doi.org/10.4319/lo.1990.35.5.1002.
Jensen, L.T., N.J. Wyatt, W.M. Landing, and J.N. Fitzsimmons. 2020. Assessment of the stability, sorption, and exchangeability of marine dissolved and colloidal metals. Marine Chemistry 220:103754, https://doi.org/10.1016/j.marchem.2020.103754.
Jensen, L.T., N.T. Lanning, C.M. Marsay, C.S. Buck, A.M. Aguilar-Islas, R. Rember, W.M. Landing, R.M. Sherrell, and J.N. Fitzsimmons. 2021. Biogeochemical cycling of colloidal trace metals in the Arctic cryosphere. Journal of Geophysical Research: Oceans 126(8):e2021JC017394, https://doi.org/10.1029/2021JC017394.
Johnson, K.S., R.M. Gordon, and K.H. Coale. 1997. What controls dissolved iron concentrations in the world ocean? Marine Chemistry 57(3):137–161, https://doi.org/10.1016/S0304-4203(97)00043-1.
Karavoltsos, S., A. Sakellari, S. Strmečki, M. Plavšić, E. Ioannou, V. Roussis, M. Dassenakis, and M. Scoullos. 2013. Copper complexing properties of exudates and metabolites of macroalgae from the Aegean Sea. Chemosphere 91(11):1,590–1,595, https://doi.org/10.1016/j.chemosphere.2012.12.053.
Kim, J.-M., O. Baars, and F.M.M. Morel. 2015. Bioavailability and electroreactivity of zinc complexed to strong and weak organic ligands. Environmental Science & Technology 49(18):10,894–10,902, https://doi.org/10.1021/acs.est.5b02098.
Kim, T., H. Obata, Y. Kondo, H. Ogawa, and T. Gamo. 2015. Distribution and speciation of dissolved zinc in the western North Pacific and its adjacent seas. Marine Chemistry 173:330–341, https://doi.org/10.1016/j.marchem.2014.10.016.
Kraemer, S.M., A. Butler, P. Borer, and J. Cervini-Silva. 2005. Siderophores and the dissolution of iron-bearing minerals in marine systems. Reviews in Mineralogy and Geochemistry 59(1):53–84, https://doi.org/10.2138/rmg.2005.59.4.
Kramer, J., Ö. Özkaya, and R. Kümmerli. 2020. Bacterial siderophores in community and host interactions. Nature Reviews Microbiology 18(3):152–163, https://doi.org/10.1038/s41579-019-0284-4.
Kunde, K., N.J. Wyatt, D. González-Santana, A. Tagliabue, C. Mahaffey, and M.C. Lohan. 2019. Iron distribution in the subtropical North Atlantic: The pivotal role of colloidal iron. Global Biogeochemical Cycles 33(12):1,532–1,547, https://doi.org/10.1029/2019GB006326.
Laglera, L.M., and C.M.G. van den Berg. 2009. Evidence for geochemical control of iron by humic substances in seawater. Limnology and Oceanography 54(2):610–619, https://doi.org/10.4319/lo.2009.54.2.0610.
Laglera, L.M., C. Sukekava, H.A. Slagter, J. Downes, A. Aparicio-Gonzalez, and L.J.A. Gerringa. 2019. First quantification of the controlling role of humic substances in the transport of iron across the surface of the Arctic Ocean. Environmental Science & Technology 53(22):13,136–13,145, https://doi.org/10.1021/acs.est.9b04240.
Lannuzel, D., M. Grotti, M.L. Abelmoschi, and P. van der Merwe. 2015. Organic ligands control the concentrations of dissolved iron in Antarctic sea ice. Marine Chemistry 174:120–130, https://doi.org/10.1016/j.marchem.2015.05.005.
Lis, H., C. Kranzler, N. Keren, and Y. Shaked. 2015a. A comparative study of iron uptake rates and mechanisms amongst marine and fresh water cyanobacteria: Prevalence of reductive iron uptake. Life (Basel) 5(1):841–860, https://doi.org/10.3390/life5010841.
Lis, H., Y. Shaked, C. Kranzler, N. Keren, and F.M.M. Morel. 2015b. Iron bioavailability to phytoplankton: An empirical approach. The ISME Journal 9(4):1,003–1,013, https://doi.org/10.1038/ismej.2014.199.
Liu, F., C. Fortin, and P.G.C. Campbell. 2017. Can freshwater phytoplankton access cadmium bound to low-molecular-weight thiols? Limnology and Oceanography 62(6):2,604–2,615, https://doi.org/10.1002/lno.10593.
Liu, F., Q.G. Tan, D. Weiss, A. Crémazy, C. Fortin, and P.G.C. Campbell. 2020. Unravelling metal speciation in the microenvironment surrounding phytoplankton cells to improve predictions of metal bioavailability. Environmental Science & Technology 54(13):8,177–8,185, https://doi.org/10.1021/acs.est.9b07773.
Liu, F., M. Gledhill, Q.-G. Tan, K. Zhu, Q. Zhang, P. Salaün, A. Tagliabue, Y. Zhang, D. Weiss, E.P. Achterberg, and Y. Korchev. 2022. Phycosphere pH of unicellular nano- and micro- phytoplankton cells and consequences for iron speciation. The ISME Journal 16(10):2,329–2,336, https://doi.org/10.1038/s41396-022-01280-1.
Luther, G.W. III, K.M. Mullaugh, E.J. Hauser, K.J. Rader, and D.M. Di Toro. 2021. Determination of ambient dissolved metal ligand complexation parameters via kinetics and pseudo-voltammetry experiments. Marine Chemistry 234:103998, https://doi.org/10.1016/j.marchem.2021.103998.
Mahieu, L., D. Omanović, H. Whitby, K.N. Buck, S. Caprara, and P. Salaün. 2024. Recommendations for best practice for iron speciation by competitive ligand exchange adsorptive cathodic stripping voltammetry with salicylaldoxime. Marine Chemistry 259:104348, https://doi.org/10.1016/j.marchem.2023.104348.
Mahowald, N.M., A.R. Baker, G. Bergametti, N. Brooks, R.A. Duce, T.D. Jickells, N. Kubilay, J.M. Prospero, and I. Tegen. 2005. Atmospheric global dust cycle and iron inputs to the ocean. Global Biogeochemical Cycles 19(4), https://doi.org/10.1029/2004GB002402.
Manck, L.E., J. Park, B.J. Tully, A.M. Poire, R.M. Bundy, C.L. Dupont, and K.A. Barbeau. 2022. Petrobactin, a siderophore produced by Alteromonas, mediates community iron acquisition in the global ocean. The ISME Journal 16(2):358–369, https://doi.org/10.1038/s41396-021-01065-y.
Mellett, T., M.T. Brown, P.D. Chappell, C. Duckham, J.N. Fitzsimmons, C.P. Till, R.M. Sherrell, M.T. Maldonado, and K.N. Buck. 2018. The biogeochemical cycling of iron, copper, nickel, cadmium, manganese, cobalt, lead, and scandium in a California Current experimental study. Limnology and Oceanography 63(S1):S425-S447, https://doi.org/10.1002/lno.10751.
Moffett, J.W., L.E. Brand, P.L. Croot, and K.A. Barbeau. 1997. Cu speciation and cyanobacterial distribution in harbors subject to anthropogenic Cu inputs. Limnology and Oceanography 42(5):789–799, https://doi.org/10.4319/lo.1997.42.5.0789.
Moffett, J.W., and R.M. Boiteau. 2024. Metal organic complexation in seawater: Historical background and future directions. Annual Review of Marine Science 16:577–599, https://doi.org/10.1146/annurev-marine-033023-083652.
Moore, J.K., S.C. Doney, D.M. Glover, and I.Y. Fung. 2001. Iron cycling and nutrient-limitation patterns in surface waters of the World Ocean. Deep Sea Research Part II 49(1):463–507, https://doi.org/10.1016/S0967-0645(01)00109-6.
Moore, L.E., M.I. Heller, K.A. Barbeau, J.W. Moffett, and R.M. Bundy. 2021. Organic complexation of iron by strong ligands and siderophores in the eastern tropical North Pacific oxygen deficient zone. Marine Chemistry 236:104021, https://doi.org/10.1016/j.marchem.2021.104021.
Moriyasu, R., and J.W. Moffett. 2022. Determination of inert and labile copper on GEOTRACES samples using a novel solvent extraction method. Marine Chemistry 239:104073, https://doi.org/10.1016/j.marchem.2021.104073.
Moriyasu, R., S.G. John, X. Bian, S.-C. Yang, and J.W. Moffett. 2023. Cu exists predominantly as kinetically inert complexes throughout the interior of the equatorial and North Pacific Ocean. Global Biogeochemical Cycles 37(7):e2022GB007521, https://doi.org/10.1029/2022GB007521.
Nixon, R.L., S.L. Jackson, J.T. Cullen, and A.R.S. Ross. 2019. Distribution of copper-complexing ligands in Canadian Arctic waters as determined by immobilized copper (II)-ion affinity chromatography. Marine Chemistry 215:103673, https://doi.org/10.1016/j.marchem.2019.103673.
Nixon, R.L., M.A. Peña, R. Taves, D.J. Janssen, J.T. Cullen, and A.R.S. Ross. 2021. Evidence for the production of copper-complexing ligands by marine phytoplankton in the subarctic northeast Pacific. Marine Chemistry 237:104034, https://doi.org/10.1016/j.marchem.2021.104034.
Noble, A.E. 2012. Influences on the Oceanic Biogeochemical Cycling of the Hybrid-Type Metals: Cobalt, Iron, and Manganese. Massachusetts Institute of Technology, PhD dissertation, https://doi.org/10.1575/1912/5027.
Noble, A.E., D.C. Ohnemus, N.J. Hawco, P.J. Lam, and M.A. Saito. 2017. Coastal sources, sinks and strong organic complexation of dissolved cobalt within the US North Atlantic GEOTRACES transect GA03. Biogeosciences 14(11):2,715–2,739, https://doi.org/10.5194/bg-14-2715-2017.
Norman, L., I.A.M. Worms, E. Angles, A.R. Bowie, C.M. Nichols, A.N. Pham, V.I. Slaveykova, A.T. Townsend, T.D. Waite, and C.S. Hassler. 2015. The role of bacterial and algal exopolymeric substances in iron chemistry. Marine Chemistry 173:148-161, https://doi.org/10.1016/j.marchem.2015.03.015.
Omanovic, D., C. Gamier, and I. Pizeta. 2015. ProMCC: An all-in-one tool for trace metal complexation studies. Marine Chemistry 173:25–39, https://doi.org/10.1016/j.marchem.2014.10.011.
Park, J., B.P. Durham, R.S. Key, R.D. Groussman, Z. Bartolek, P. Pinedo-Gonzalez, N.J. Hawco, S.G. John, M.C. Carlson, D. Lindell, and others. 2023. Siderophore production and utilization by marine bacteria in the North Pacific Ocean. Limnology and Oceanography 68(7):1,636–1,653, https://doi.org/10.1002/lno.12373.
Piontek, J., N. Händel, G. Langer, J. Wohlers, U. Riebesell, and A. Engel. 2009. Effects of rising temperature on the formation and microbial degradation of marine diatom aggregates. Aquatic Microbial Ecology 54(3):305–318, https://doi.org/10.3354/ame01273.
Pizeta, I., S.G. Sander, R.J.M. Hudson, D. Omanovic, O. Baars, K.A. Barbeau, K.N. Buck, R.M. Bundy, G. Carrasco, P.L. Croot, and others. 2015. Interpretation of complexometric titration data: An intercomparison of methods for estimating models of trace metal complexation by natural organic ligands. Marine Chemistry 173:3–24, https://doi.org/10.1016/j.marchem.2015.03.006.
Plavšić, M., and S. Strmečki. 2016. Carbohydrate polymers as constituents of exopolymer substances in seawater, their complexing properties towards copper ions, surface and catalytic activity determined by electrochemical methods. Carbohydrate Polymers 135:48–56, https://doi.org/10.1016/j.carbpol.2015.08.071.
Resing, J.A., P.N. Sedwick, C.R. German, W.J. Jenkins, J.W. Moffett, B.M. Sohst, and A. Tagliabue. 2015. Basin-scale transport of hydrothermal dissolved metals across the South Pacific Ocean. Nature 523(7559):200–203, https://doi.org/10.1038/nature14577.
Richon, C., and A. Tagliabue. 2019. Insights into the major processes driving the global distribution of copper in the ocean from a global model. Global Biogeochemical Cycles 33(12):1,594–1,610, https://doi.org/10.1029/2019GB006280.
Ruacho, A., C. Richon, H. Whitby, and R.M. Bundy. 2022. Sources, sinks, and cycling of dissolved organic copper binding ligands in the ocean. Communications Earth & Environment 3:263, https://doi.org/10.1038/s43247-022-00597-1.
Rue, E.L., and K.W. Bruland. 1995. Complexation of iron(iii) by natural organic-ligands in the Central North Pacific as determined by a new competitive ligand equilibration adsorptive cathodic stripping voltammetric method. Marine Chemistry 50(1–4):117–138, https://doi.org/10.1016/0304-4203(95)00031-L.
Saito, M.A., G. Rocap, and J.W. Moffett. 2005. Production of cobalt binding ligands in a Synechococcus feature at the Costa Rica upwelling dome. Limnology and Oceanography 50(1):279–290, https://doi.org/10.4319/lo.2005.50.1.0279.
Sander, S.G., and A. Koschinsky. 2011. Metal flux from hydrothermal vents increased by organic complexation. Nature Geoscience 4(3):145–150, https://doi.org/10.1038/ngeo1088.
Santana-Casiano, J.M., M. González-Dávila, A.G. González, and F.J. Millero. 2010. Fe(III) reduction in the presence of catechol in seawater. Aquatic Geochemistry 16(3):467–482, https://doi.org/10.1007/s10498-009-9088-x.
Schlosser, C., P. Streu, M. Frank, G. Lavik, P.L. Croot, M. Dengler, and E.P. Achterberg. 2018. H2S events in the Peruvian oxygen minimum zone facilitate enhanced dissolved Fe concentrations. Scientific Reports 8(1):12642, https://doi.org/10.1038/s41598-018-30580-w.
Semeniuk, D.M., R.M. Bundy, C.D. Payne, K.A. Barbeau, and M.T. Maldonado. 2015. Acquisition of organically complexed copper by marine phytoplankton and bacteria in the northeast subarctic Pacific Ocean. Marine Chemistry 173:222–233, https://doi.org/10.1016/j.marchem.2015.01.005.
Shaked, Y., A.B. Kustka, and F.M.M. Morel. 2005. A general kinetic model for iron acquisition by eukaryotic phytoplankton. Limnology and Oceanography 50(3):872–882, https://doi.org/10.4319/lo.2005.50.3.0872.
Shaked, Y., and H. Lis. 2012. Disassembling iron availability to phytoplankton. Frontiers in Microbiology 3:123, https://doi.org/10.3389/fmicb.2012.00123.
Shaked, Y., K.N. Buck, T. Mellett, and M.T. Maldonado. 2020. Insights into the bioavailability of oceanic dissolved Fe from phytoplankton uptake kinetics. The ISME Journal 14(5):1,182–1,193, https://doi.org/10.1038/s41396-020-0597-3.
Shaked, Y., B.S. Twining, A. Tagliabue, and M.T. Maldonado. 2021. Probing the bioavailability of dissolved iron to marine eukaryotic phytoplankton using in situ single cell iron quotas. Global Biogeochemical Cycles 35(8):e2021GB006979, https://doi.org/10.1029/2021GB006979.
Shi, D., Y. Xu, B.M. Hopkinson, and F.M.M. Morel. 2010. Effect of ocean acidification on iron availability to marine phytoplankton. Science 327(5966):676–679, https://doi.org/10.1126/science.1183517.
Sinoir, M., M.J. Ellwood, E.C. Butler, A.R. Bowie, M. Mongin, and C.S. Hassler. 2016. Zinc cycling in the Tasman Sea: Distribution, speciation and relation to phytoplankton community. Marine Chemistry 182:25–37, https://doi.org/10.1016/j.marchem.2016.03.006.
Slagter, H.A., L.M. Laglera, C. Sukekava, and L.J.A. Gerringa. 2019. Fe-binding organic ligands in the humic-rich TransPolar Drift in the surface Arctic Ocean using multiple voltammetric methods. Journal of Geophysical Research: Oceans 124(3):1,491–1,508, https://doi.org/10.1029/2018JC014576.
Stockdale, A., E. Tipping, J. Hamilton-Taylor, and S. Lofts. 2011. Trace metals in the open oceans: Speciation modelling based on humic-type ligands. Environmental Chemistry 8(3):304–319, https://doi.org/10.1071/EN11004.
Sukekava, C.F., J. Downes, M. Filella, B. Vilanova, and L.M. Laglera. 2024. Ligand exchange provides new insight into the role of humic substances in the marine iron cycle. Geochimica et Cosmochimica Acta 366:17–30, https://doi.org/10.1016/j.gca.2023.12.007.
Sunda, W. 1975. The Relationship Between Cupric Ion Activity and the Toxicity of Copper to Phytoplankton. Doctoral thesis, Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 167 pp., https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/8598edc4-7e97-52d6-8e95-5e40b929b30e/content.
Sunda, W.G. 2012. Feedback interactions between trace metal nutrients and phytoplankton in the ocean. Frontiers in Microbiology 3:204, https://doi.org/10.3389/fmicb.2012.00204.
Sunda, W.G., and S.A. Huntsman. 2000. Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton: Implications for oceanic Cd cycling. Limnology and Oceanography 45(7):1,501–1,516, https://doi.org/10.4319/lo.2000.45.7.1501.
Swarr, G.J., T. Kading, C.H. Lamborg, C.R. Hammerschmidt, and K.L. Bowman. 2016. Dissolved low-molecular weight thiol concentrations from the US GEOTRACES North Atlantic Ocean zonal transect. Deep-Sea Research Part I 116:77–87, https://doi.org/10.1016/j.dsr.2016.06.003.
Tagliabue, A., and C. Völker. 2011. Towards accounting for dissolved iron speciation in global ocean models. Biogeosciences 8(10):3,025–3,039, https://doi.org/10.5194/bg-8-3025-2011.
Tagliabue, A., O. Aumont, R. DeAth, J.P. Dunne, S. Dutkiewicz, E. Galbraith, K. Misumi, J.K. Moore, A. Ridgwell, E. Sherman, and others. 2016. How well do global ocean biogeochemistry models simulate dissolved iron distributions? Global Biogeochemical Cycles 30(2):149–174, https://doi.org/10.1002/2015GB005289.
Tagliabue, A., K.N. Buck, L.E. Sofen, B.S. Twining, O. Aumont, P.W. Boyd, S. Caprara, W.B. Homoky, R. Johnson, D. König, and others. 2023. Authigenic mineral phases as a driver of the upper-ocean iron cycle. Nature 620(7972):104–109, https://doi.org/10.1038/s41586-023-06210-5.
Tani, H., J. Nishioka, K. Kuma, H. Takata, Y. Yamashita, E. Tanoue, and T. Midorikawa. 2003. Iron(III) hydroxide solubility and humic-type fluorescent organic matter in the deep water column of the Okhotsk Sea and the northwestern North Pacific Ocean. Deep-Sea Research Part I 50(9):1,063–1,078, https://doi.org/10.1016/S0967-0637(03)00098-0.
Thuróczy, C.E., L.J.A. Gerringa, M. Klunder, P. Laan, M. Le Guitton, and H.J.W. de Baar. 2011. Distinct trends in the speciation of iron between the shallow shelf seas and the deep basins of the Arctic Ocean. Journal of Geophysical Research: Oceans 116(C10), https://doi.org/10.1029/2010JC006835.
Toner, B.M., S.C. Fakra, S.J. Manganini, C.M. Santelli, M.A. Marcus, J.W. Moffett, O. Rouxel, C.R. German, and K.J. Edwards. 2009a. Preservation of iron(II) by carbon-rich matrices in a hydrothermal plume. Nature Geoscience 2(3):197–201, https://doi.org/10.1038/ngeo433.
Toner, B.M., C.M. Santelli, M.A. Marcus, R. Wirth, C.S. Chan, T. McCollom, W. Bach, and K.J. Edwards. 2009b. Biogenic iron oxyhydroxide formation at mid-ocean ridge hydrothermal vents: Juan de Fuca Ridge. Geochimica et Cosmochimica Acta 73(2):388–403, https://doi.org/10.1016/j.gca.2008.09.035.
Turner, D.R., E.P. Achterberg, C.-T.A. Chen, S.L. Clegg, V. Hatje, M.T. Maldonado, S.G. Sander, C.M.G. van den Berg, and M. Wells. 2016. Toward a quality-controlled and accessible Pitzer model for seawater and related systems. Frontiers in Marine Science 3:139, https://doi.org/10.3389/fmars.2016.00139.
van den Berg, C.M.G. 1984. Determination of the complexing capacity and conditional stability constants of complexes of copper(II) with natural organic ligands in seawater by cathodic stripping voltammetry of copper-catechol complex ions. Marine Chemistry 15(1):1–18, https://doi.org/10.1016/0304-4203(84)90035-5.
Velasquez, I.B., E. Ibisanmi, E.W. Maas, P.W. Boyd, S. Nodder, and S.G. Sander. 2016. Ferrioxamine siderophores detected amongst iron binding ligands produced during the remineralization of marine particles. Frontiers in Marine Science 3:172, https://doi.org/10.3389/fmars.2016.00172.
Völker, C., and A. Tagliabue. 2015. Modeling organic iron-binding ligands in a three-dimensional biogeochemical ocean model. Marine Chemistry 173:67–77, https://doi.org/10.1016/j.marchem.2014.11.008.
Vraspir, J.M., and A. Butler. 2009. Chemistry of marine ligands and siderophores. Annual Review of Marine Science 1:43–63, https://doi.org/10.1146/annurev.marine.010908.163712.
Wagener, T., C. Guieu, and N. Leblond. 2010. Effects of dust deposition on iron cycle in the surface Mediterranean Sea: Results from a mesocosm seeding experiment. Biogeosciences 7(11):3,769–3,781, https://doi.org/10.5194/bg-7-3769-2010.
Wang, H., Q. Yan, Q. Yang, F. Ji, K.H. Wong, and H. Zhou. 2019. The size fractionation and speciation of iron in the Longqi hydrothermal plumes on the Southwest Indian Ridge. Journal of Geophysical Research: Oceans 124(6):4,029–4,043, https://doi.org/10.1029/2018JC014713.
Wang, H., J.A. Resing, Q. Yan, N.J. Buck, S.M. Michael, H. Zhou, M. Liu, S.L. Walker, Q. Yang, and F. Ji. 2021. The characteristics of Fe speciation and Fe-binding ligands in the Mariana back-arc hydrothermal plumes. Geochimica et Cosmochimica Acta 292:24–36, https://doi.org/10.1016/j.gca.2020.09.016.
Wells, M., K.N. Buck, and S.G. Sander. 2013. New approach to analysis of voltammetric ligand titration data improves understanding of metal speciation in natural waters. Limnology and Oceanography-Methods 11:450–465, https://doi.org/10.4319/lom.2013.11.450.
Whitby, H., A.M. Posacka, M.T. Maldonado, and C.M.G. van den Berg. 2018. Copper-binding ligands in the NE Pacific. Marine Chemistry 204:36–48, https://doi.org/10.1016/j.marchem.2018.05.008.
Whitby, H., M. Bressac, G. Sarthou, M.J. Ellwood, C. Guieu, and P.W. Boyd. 2020a. Contribution of electroactive humic substances to the iron-binding ligands released during microbial remineralization of sinking particles. Geophysical Research Letters 47(7):e2019GL086685, https://doi.org/10.1029/2019GL086685.
Whitby, H., H. Planquette, N. Cassar, E. Bucciarelli, C.L. Osburn, D.J. Janssen, J.T. Cullen, A.G. González, C. Völker, and G. Sarthou. 2020b. A call for refining the role of humic-like substances in the oceanic iron cycle. Scientific Reports 10(1):6,144, https://doi.org/10.1038/s41598-020-62266-7.
Wuttig, K., T. Wagener, M. Bressac, A. Dammshäuser, C. Guieu, and P.L. Croot. 2013. Impacts of dust deposition on dissolved trace metal concentrations (Mn, Al and Fe) during a mesocosm experiment. Biogeosciences 4:2,583–2,600, https://doi.org/10.5194/bg-10-2583-2013.
Yamashita, Y., J. Nishioka, H. Obata, and H. Ogawa. 2020. Shelf humic substances as carriers for basin-scale iron transport in the North Pacific. Scientific Reports 10:4505, https://doi.org/10.1038/s41598-020-61375-7.
Ye, Y., C. Völker, and M. Gledhill. 2020. Exploring the iron-binding potential of the ocean using a combined pH and DOC parameterization. Global Biogeochemical Cycles 34(6):e2019GB006425, https://doi.org/10.1029/2019GB006425.
Zhu, K., A.J. Birchill, A. Milne, S. Ussher, M.P. Humphreys, N. Carr, C. Mahaffey, M.C. Lohan, E.P. Achterberg, and M. Gledhill. 2021a. Equilibrium calculations of iron speciation and apparent iron solubility in the Celtic Sea at ambient seawater pH using the NICA-Donnan model. Marine Chemistry 237:104038, https://doi.org/10.1016/j.marchem.2021.104038.
Zhu, K., M.J. Hopwood, J.E. Groenenberg, A. Engel, E.P. Achterberg, and M. Gledhill. 2021b. Influence of pH and dissolved organic matter on iron speciation and apparent iron solubility in the Peruvian shelf and slope region. Environmental Science & Technology 55(13):9,372–9,383, https://doi.org/10.1021/acs.est.1c02477.