Distribution patterns of dissolved trace metals (Fe, Ni, Cu, Zn, Cd, and Pb) in China marginal seas during the GEOTRACES GP06-CN cruise

Zhang, Ruifeng; Ren, Jianqiang; Zhang, Zhaoru; Zhu, Zhu; John, Seth G.

doi:10.1016/j.chemgeo.2022.120948

Cited by 7 publications

(4 citation statements)

References 82 publications

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“…Comparable shifts in these stressors are projected to occur in other oceanic regions ( Cheng et al, 2019 ; Tagliabue et al, 2020 ), and we suggest that our findings may also extend to other Synechococcus ecotypes under similar Fe regimes. However, effects of climate change on Fe-rich dust and terrestrial sources which also contribute Fe to varying regions of the South China Sea remain uncertain and require more studies ( Hutchins and Boyd, 2016 ; Zhang et al, 2022 ).…”

Section: Discussionmentioning

confidence: 99%

“…While much of the open ocean is chronically Fe limited, input from dust, upwelling, or riverine sources alleviates Fe limitation either seasonally or entirely in some regions. Overall, Fe availability typically declines along a gradient from coastal to offshore habitats, though coastal Fe concentrations can fluctuate throughout the year ( Tagliabue et al, 2017 ; Twining et al, 2021 ; Zhang et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

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Proteomics analysis reveals differential acclimation of coastal and oceanic Synechococcus to climate warming and iron limitation

Schiksnis,

Xu,

Saito

et al. 2024

Front. Microbiol.

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In many oceanic regions, anthropogenic warming will coincide with iron (Fe) limitation. Interactive effects between warming and Fe limitation on phytoplankton physiology and biochemical function are likely, as temperature and Fe availability affect many of the same essential cellular pathways. However, we lack a clear understanding of how globally significant phytoplankton such as the picocyanobacteria Synechococcus will respond to these co-occurring stressors, and what underlying molecular mechanisms will drive this response. Moreover, ecotype-specific adaptations can lead to nuanced differences in responses between strains. In this study, Synechococcus isolates YX04-1 (oceanic) and XM-24 (coastal) from the South China Sea were acclimated to Fe limitation at two temperatures, and their physiological and proteomic responses were compared. Both strains exhibited reduced growth due to warming and Fe limitation. However, coastal XM-24 maintained relatively higher growth rates in response to warming under replete Fe, while its growth was notably more compromised under Fe limitation at both temperatures compared with YX04-1. In response to concurrent heat and Fe stress, oceanic YX04-1 was better able to adjust its photosynthetic proteins and minimize the generation of reactive oxygen species while reducing proteome Fe demand. Its intricate proteomic response likely enabled oceanic YX04-1 to mitigate some of the negative impact of warming on its growth during Fe limitation. Our study highlights how ecologically-shaped adaptations in Synechococcus strains even from proximate oceanic regions can lead to differing physiological and proteomic responses to these climate stressors.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proteomics analysis reveals differential acclimation of coastal and oceanic Synechococcus to climate warming and iron limitation

Schiksnis,

Xu,

Saito

et al. 2024

Front. Microbiol.

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“…For example, the maximum Ni concentrations in the surface waters of the Mediterranean Sea are high (up to ~4 nmol kg -1 ) due to both atmospheric and fluvial inputs (Saager et al, 1993;Morley et al, 1997;Zeri and Voutsinou-Taliadouri, 2003;Middag et al, 2022). Ni enrichment relative to the Ni levels in adjacent open ocean waters have also been observed in other marginal seas of the world, as the Gulf of California (Domıńguez-Rosas, 2008), the Baltic Sea (Kremling, 1983), the Black Sea (Lewis and Landing, 1992) and the Yellow Sea (Zhang et al, 2022). However, even in Ni-rich systems such as these, Ni addition has been found to stimulate phytoplankton growth (e.g., Dupont et al, 2010), which reveals the complexity of the interactions between Ni and biological activity, and thus highlights the necessity to study the spatial distribution of this element and the factors that affect its availability to primary producers.…”

Section: Introductionmentioning

confidence: 97%

Spatial variability of dissolved nickel is enhanced by mesoscale dynamics in the Gulf of Mexico

et al. 2023

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The Gulf of Mexico (GoM) is one of the most dynamic marginal seas in the world owing to the intrusion of the Loop Current and the shedding of anticyclonic eddies (LCE) that travel westward across the Gulf. However, the impacts of these mesoscale dynamics on the supply and removal of bioessential trace metals in surface waters remain unclear. We study the impact of mesoscale eddies on the distribution of dissolved nickel (Ni), a biologically active element scarcely studied in the region. The vertical distribution of Ni was determined in the deep-water region of the GoM during summer of 2017, when two anticyclonic LCE (Quantum and Poseidon) were present. Nutrient-like profiles of Ni in the GoM resemble those from the Atlantic Ocean, but they showed high spatial variability within the first 1000 m, which was associated with the impact of mesoscale eddies. Similarly to subtropical gyres, macronutrients were almost depleted in surface waters, while Ni never fell below 1.51 nmol kg-1, suggesting low Ni lability or alternatively, slow biological uptake compared to that of macronutrients. In particular, lowest levels of Ni and macronutrients (PO4 and NO3) were recorded in surface waters of the anticyclonic eddies and the Loop Current area. Anticyclonic LCEs deepened these Ni-poor waters pushing the Ni-rich core of Tropical Atlantic Central Water up to 600 m, whereas its shallowest position (up to 200 m) was recorded under cyclonic conditions in Campeche Bay. This eddy-induced vertical displacement of water masses also affected the integrated Ni and macronutrient concentrations in the upper 350 m but without modifying their stoichiometries. We suggest that a significant decrease in surface inventories of Ni and macronutrient in areas impacted by LCEs is a consequence of the trapping of the water within eddies, the biological uptake of Ni and macronutrients combined with their limited replenishment from below, which likely affects autotrophic groups. In conclusion, the mesoscale dynamic permanently present in the GoM play an important role in modifying the vertical distribution of Ni and macronutrients as well as their availability in the upper water column of this marginal sea.

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“…Excessive amounts of these metals have toxic effects, such as metabolism inhibition within algal cells [1]. After the industrial revolution, human activities have led to much emission of these bio-essential trace metals and other heavy metal pollutants into the ocean's interior, especially in marginal seas [4][5][6]. As trace metals can serve as useful tracers and proxies for identifying sources and biogeochemical processes [7], investigating the contribution of different sources to marine trace metals is therefore essential to better understand the biogeochemical cycling of trace metals in modern oceans and to assess the impacts of human activities on marine ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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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Distribution patterns of dissolved trace metals (Fe, Ni, Cu, Zn, Cd, and Pb) in China marginal seas during the GEOTRACES GP06-CN cruise

Cited by 7 publications

References 82 publications

Proteomics analysis reveals differential acclimation of coastal and oceanic Synechococcus to climate warming and iron limitation

Proteomics analysis reveals differential acclimation of coastal and oceanic Synechococcus to climate warming and iron limitation

Spatial variability of dissolved nickel is enhanced by mesoscale dynamics in the Gulf of Mexico

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

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