Vertical Flux of Trace Elements Associated With Lithogenic and Biogenic Carrier Phases in the Southern Ocean

Blain, S.; Planquette, Hélène; Obernosterer, Ingrid; Guéneuguès, Audrey

doi:10.1029/2022gb007371

Cited by 7 publications

(6 citation statements)

References 74 publications

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“…Lithogenic particles present a potentially important source of Fe in early spring above the Kerguelen plateau (Blain et al, 2022). This Fe source is geochemically complex and needs to be rendered biologically available via dissolution as for example through the binding to high affinity ligands (Kalinowski et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…This naturally Fe-fertilized region has been extensively studied during previous oceanographic cruises focusing on distinct time periods, that are early spring, mid and late summer (projects KEOPS1&2 and MOBYDICK). The deployment of the RAS from 25 October 2016 to 24 February 2017 has for the first time provided a full seasonal picture of the physical context (Pellichero et al, 2020), inorganic nutrient concentrations and characteristics of the consecutive phytoplankton blooms and their carbon and trace element export (Blain et al, 2021(Blain et al, , 2022. Briefly, the spring phytoplankton bloom started in late October and peaked by mid-November and the summer bloom occurred in early January (Figure S1A).…”

Section: Environmental Contextmentioning

confidence: 99%

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Seasonal shifts in Fe‐acquisition strategies in Southern Ocean microbial communities revealed by metagenomics and autonomous sampling

Zhang

Debeljak

Blain

et al. 2023

Environmental Microbiology

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Iron (Fe) governs the cycling of organic carbon in large parts of the Southern Ocean. The strategies of diverse microbes to acquire the different chemical forms of Fe under seasonally changing organic carbon regimes remain, however, poorly understood. Here, we report high‐resolution seasonal metagenomic observations from the region off Kerguelen Island (Indian Sector of the Southern Ocean) where natural Fe‐fertilization induces consecutive spring and summer phytoplankton blooms. Our data illustrate pronounced, but distinct seasonal patterns in the abundance of genes implicated in the transport of different forms of Fe and organic substrates, of siderophore biosynthesis and carbohydrate‐active enzymes. The seasonal dynamics suggest a temporal decoupling in the prokaryotic requirements of Fe and organic carbon during the spring phytoplankton bloom and a concerted access to these resources after the summer bloom. Taxonomic assignments revealed differences in the prokaryotic groups harbouring genes of a given Fe‐related category and pronounced seasonal successions were observed. Using MAGs we could decipher the respective Fe‐ and organic substrate‐related genes of individual taxa assigned to abundant groups. The ecological strategies related to Fe‐acquisition provide insights on how this element could shape microbial community composition with potential implications on organic matter transformations in the Southern Ocean.

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Section: Discussionmentioning

confidence: 99%

Section: Environmental Contextmentioning

confidence: 99%

Seasonal shifts in Fe‐acquisition strategies in Southern Ocean microbial communities revealed by metagenomics and autonomous sampling

Zhang

Debeljak

Blain

et al. 2023

Environmental Microbiology

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“…The EF values of Ni ranged from 1.7 to 8.3, with an average of 3.1 ± 1.1. PCA is useful for evaluating the concentration correlations and potential sources of these elements in sinking particles at the three trap depths [13,35]. The PCA results showed that the first two major components could explain 76.5, 72.6, and 55.8% of the total variance in the concentrations of trace metals in sinking particles at 1000 m, 2150 m, and 3200 m, respectively (Figure 4).…”

Section: Source Identificationmentioning

confidence: 99%

“…The PCA results showed that the first two major components could explain 76.5, 72.6, and 55.8% of the total variance in the concentrations of trace metals in sinking particles at 1000 m, 2150 m, and 3200 m, respectively (Figure 4). Al and Fe were mainly controlled via the first component and were mainly related to lithogenic material at all three sampling depths, which PCA is useful for evaluating the concentration correlations and potential sources of these elements in sinking particles at the three trap depths [13,35]. The PCA results showed that the first two major components could explain 76.5, 72.6, and 55.8% of the total variance in the concentrations of trace metals in sinking particles at 1000 m, 2150 m, and 3200 m, respectively (Figure 4).…”

Section: Source Identificationmentioning

confidence: 99%

“…Bioactive trace metal sources in marine particles are generally divided into abiotic and biotic fractions [33,34], lithogenic and non-lithogenic (excess) fractions [31,35,41], or lithogenic, intracellular, and adsorbed fractions [13]. Nowadays, the deposition of anthropogenic aerosols are considered as an important source of bioactive trace metals (such as Cu and Zn) in sinking particles in the NSCS [14,15].…”

Section: Different Source Contributions Of Bioactive Trace Metals In ...mentioning

confidence: 99%

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Different Source Contributions of Bioactive Trace Metals in Sinking Particles in the Northern South China Sea

Li,

Zhang,

et al. 2023

JMSE

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Time-series samples intercepted via three synchronized moored sediment traps, deployed at 1000 m, 2150 m, and 3200 m in the northern South China Sea (NSCS) during June 2009–May 2010, were analyzed to quantify the bioactive trace metal fluxes in sinking particles and investigate their different source contributions. Iron (Fe) primarily originated from lithogenic sources. Manganese (Mn), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn) exhibited various degrees of enrichment over their continental crustal ratios. Since the sources of bioactive trace metals in sinking particles can be divided into lithogenic, biogenic, and excess fractions, mass conservation calculations were used to quantify the contribution of each source. The results showed that Fe, Mn, and Co had extremely low biogenic proportions (0.1–3.3%), while Ni, Cu, and Zn had higher proportions (2.7–17.3%), with the biogenic fraction decreasing with the depth. Moreover, excess sources accounted for a significant proportion of Mn (68–75%), Co (34–54%), Ni (60–62%), Cu (59–74%), and Zn (56–65%) in sinking particles at the three sampling depths. The excess fractions of Mn, Co, and Cu in sinking particles can be affected by authigenic particles. This is supported by their similar scavenging-type behavior, as observed via the increase in their fluxes and enrichment patterns with the increasing depth. Furthermore, the excess fractions of Ni, Cu, and Zn may have significant contributions from anthropogenic sources. The variability of Fe in sinking particles was mainly controlled via lithogenic matter. Notably, organic matter and opal were found to be pivotal carriers in the export of excess bioactive trace metals (Mn, Co, Ni, and Cu) via the water column, accompanied with the elevated ballast effect of lithogenic matter with the depth. However, the transportation of excess Zn was more complicated due to the intricate processes involved in Zn dynamics. These findings contribute to our understanding of the sources and transport mechanisms of bioactive trace metals in the marine environment.

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Tagging of water masses with covariance of trace metals and prokaryotic taxa in the Southern Ocean

Zhang,

Blain,

Baudet

et al. 2024

Limnol Oceanogr Letters

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Marine microbes are strongly interrelated to trace metals in the ocean. How the availability of trace metals selects for prokaryotic taxa and the potential feedback of microbial processes on the trace metal distribution in the ocean remain poorly understood. We investigate here the potential reciprocal links between diverse prokaryotic taxa and iron (Fe), manganese (Mn), copper (Cu), and nickel (Ni) as well as apparent oxygen utilization (AOU) across 12 well‐defined water masses in the Southern Indian Ocean (SWINGS—South West Indian Ocean GEOTRACES GS02 Section cruise). Applying partial least square regression (PLSR) analysis, we show that the water masses are associated with particular latent vectors that are a combination of the spatial distribution of prokaryotic taxa, trace elements, and AOU. This approach provides novel insights on the potential interactions between prokaryotic taxa and trace metals in relation to organic matter remineralization in distinct water masses of the ocean.

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Vertical Flux of Trace Elements Associated With Lithogenic and Biogenic Carrier Phases in the Southern Ocean

Abstract: Export fluxes of 15 trace elements reveal contrasted seasonal patterns between lithogenic and biological carriers • Basalt particles are the major lithogenic carrier phase of trace elements • Fecal pellets, diatom vegetative cells and spores are each carriers of distinct trace elements

Cited by 7 publications

References 74 publications

Seasonal shifts in Fe‐acquisition strategies in Southern Ocean microbial communities revealed by metagenomics and autonomous sampling

Seasonal shifts in Fe‐acquisition strategies in Southern Ocean microbial communities revealed by metagenomics and autonomous sampling

Different Source Contributions of Bioactive Trace Metals in Sinking Particles in the Northern South China Sea

Tagging of water masses with covariance of trace metals and prokaryotic taxa in the Southern Ocean

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