Low-molecular-weight organic acids as important factors impacting seawater acidification: A case study in the Jiaozhou Bay, China

Liang, Haorui; Lyu, Lina; Sun, Chengjun; Ding, Haiyang; Wurgaft, Eyal; Yang, Gui‐Peng

doi:10.1016/j.scitotenv.2020.138458

Cited by 10 publications

(6 citation statements)

References 52 publications

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“…Indeed, coastal ecosystems could be the production source of toxic haloacids through various natural processes ( Figure 6 ). First, low-molecular-weight organic acids such as acetic acids are ubiquitous in seawater, produced either via respiration, microbial degradation of lipids or photochemical breakdown of dissolved organic matter ( Liang et al, 2020 ). They might be converted to the corresponding halogenated acetic acids abiotically or biotically, as reported previously in terrestrial environments.…”

Section: Discussionmentioning

confidence: 99%

Functional Characterization of a L-2-Haloacid Dehalogenase From Zobellia galactanivorans DsijT Suggests a Role in Haloacetic Acid Catabolism and a Wide Distribution in Marine Environments

et al. 2021

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L-2-halocid dehalogenases (L-2-HADs) have been mainly characterized from terrestrial polluted environments. By contrast, knowledge is still scarce about their role in detoxification of predominant halocarbons in marine environments. Here, phylogenetic analyses showed a wide diversity of homologous L-2-HADs, especially among those belonging to marine bacteria. Previously characterized terrestrial L-2-HADs were part of a monophyletic group (named group A) including proteins of terrestrial and marine origin. Another branch (named group B) contained mostly marine L-2-HADs, with two distinct clades of Bacteroidetes homologs, closely linked to Proteobacteria ones. This study further focused on the characterization of the only L-2-HAD from the flavobacterium Zobellia galactanivorans DsijT (ZgHAD), belonging to one of these Group B clades. The recombinant ZgHAD was shown to dehalogenate bromo- and iodoacetic acids, and gene knockout in Z. galactanivorans revealed a direct role of ZgHAD in tolerance against both haloacetic acids. Analyses of metagenomic and metatranscriptomic datasets confirmed that L-2-HADs from group A were well-represented in terrestrial and marine bacteria, whereas ZgHAD homologs (group B L-2-HADs) were mainly present in marine bacteria, and particularly in host-associated species. Our results suggest that ZgHAD homologs could be key enzymes for marine Bacteroidetes, by conferring selective advantage for the recycling of toxic halogen compounds produced in particular marine habitats, and especially during interactions with macroalgae.

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Section: Discussionmentioning

confidence: 99%

Functional Characterization of a L-2-Haloacid Dehalogenase From Zobellia galactanivorans DsijT Suggests a Role in Haloacetic Acid Catabolism and a Wide Distribution in Marine Environments

et al. 2021

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“…Contribution of organic acids to AT in coastal areas, fjords, and estuaries usually results in high AT at low salinities (Liang et al, 2020). Organic acids are mainly found in waters with high dissolved organic matter.…”

Section: Uncertaintymentioning

confidence: 99%

Impacts of glacial and sea-ice meltwater, primary production, and ocean CO2 uptake on ocean acidification state of waters by the 79 North Glacier and northeast Greenland shelf

Fransson,

Chierici,

Granskog

et al. 2023

Front. Mar. Sci.

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The waters adjacent to the Nioghalvfjerdsbræ (79 North Glacier, 79NG) are influenced by Greenland Ice Sheet (GrIS) melt, sea-ice meltwater, and waters on the adjacent northeast Greenland shelf (NEGS). We investigated ocean acidification (OA) variables and the role of freshening, primary production, and air-sea CO2 exchange in Dijmphna Sound (DS) and on the NEGS in the summers of 2012 and 2016. The upper 150 m consisted of Polar Water with Arctic origin that was divided into a fresh surface layer (SL<50 m) and a cold halocline layer (CHL, 50 to 150 m). The layer below 150 m was of Atlantic origin. The SL freshwater was larger in 2012 than in 2016, mainly originated from local 79NG (and GrIS) runoff in DS, whereas on the NEGS in both years, it was mainly from sea-ice melt. The lowest aragonite saturation state (ΩAr) of 1.13 was found in the SL in 2012. Biological CO2 drawdown at primary production caused increased ΩAr in SL, which compensated for most of the ΩAr decrease due to the freshwater dilution of carbonate ions reducing total alkalinity, hence preventing corrosive conditions. This was most pronounced near the 79NG front in 2012, where surface stratification was most pronounced coinciding with large glacial meltwater fractions. Freshening decreased ΩAr by 0.4 at the 79NG front was compensated by biological CO2 drawdown by ~0.5. In 2016, a well-mixed water column in DS and NEGS, with dilution by sea-ice meltwater, caused less compensation on ΩAr by biological CO2 drawdown than in 2012. In future with changing climate and changing ocean chemistry, the increased meltwater effects may overcome the alleviating effects of biological CO2 drawdown on OA with unfavorable conditions for calcifying organisms. However, our study also suggests that primary production may be stimulated by stratification from surface meltwater. In addition, Atlantification and subglacial discharge may result in upwelling of inorganic nutrients that could promote primary production.

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“…They may also have autochthonous sources, such as in situ production by phytoplankton and bacteria (Dulaquais et al., 2018; Ko et al., 2016; Sarma et al., 2018). These organic acid‐base species may contribute to total alkalinity (TA) in the form of organic alkalinity (OrgAlk), which is an important control on carbonate chemistry and CO 2 fluxes in coastal waters (Liang et al., 2020; Song et al., 2020; Yang et al., 2015). However, the biogeochemical characteristics and mixing behaviors of OrgAlk in coastal systems have only been reported by a limited number of studies (Cai et al., 1998; Kuliński et al., 2014; Song et al., 2020; Yang et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Estuaries play a critical role in the coastal carbon budget by modifying organic and inorganic carbon from rivers and tidal wetlands, and ultimately transporting part of the received carbon to continental shelves (Cai, 2011; Fichot et al., 2014; Herrmann et al., 2015; Najjar et al., 2018). Organic acid‐base species have been reported to be abundant in organic carbon‐rich coastal waters (e.g., Cai et al., 1998; Hinckley, 2021; Kerr et al., 2021; Liang et al., 2020), and originate from allochthonous sources, such as rivers, wetlands, and groundwater discharge (Cai et al., 1998; Hinckley, 2021; Song et al., 2020). They may also have autochthonous sources, such as in situ production by phytoplankton and bacteria (Dulaquais et al., 2018; Ko et al., 2016; Sarma et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

Organic Alkalinity as an Important Constituent of Total Alkalinity and the Buffering System in River‐To‐Coast Transition Zones

et al. 2023

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Organic acid‐base species in the dissolved organic carbon pool have been shown to make an important contribution (i.e., organic alkalinity; OrgAlk) to the total alkalinity (TA) in many coastal systems. This study showed an intensive investigation of OrgAlk characteristics in the river‐to‐coast transition zones of six southeast Chinese rivers. OrgAlk, mainly originating from river input, accounted for an important proportion of TA (0.3% –12%) in six estuaries. Carboxylic acid groups were commonly present in six estuaries. Notable differences in the TA values (1 – 18 μmol kg‐1) determined by several established TA measurement approaches were identified in estuaries where organic acids with pKa < 5.2 were abundant. The most widely used open‐cell titration method, in comparison with closed‐cell titration and single‐step titration, is the best approach to incorporate OrgAlk in titrated TA when the pKa values of organic acids were > 5 in the study estuaries. Across our study sites, accounting for OrgAlk would change H+ concentration by 3 – 69% (i.e., pH by 0.01 – 0.61) and aragonite saturation state by 3 – 72%, indicating that OrgAlk can play a significant role in the coastal carbonate buffering system. It is essential to improve the current TA measurement approaches to more accurately represent OrgAlk in the coastal carbonate system and assess variabilities and impacts of OrgAlk.

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Low-molecular-weight organic acids as important factors impacting seawater acidification: A case study in the Jiaozhou Bay, China

Cited by 10 publications

References 52 publications

Functional Characterization of a L-2-Haloacid Dehalogenase From Zobellia galactanivorans DsijT Suggests a Role in Haloacetic Acid Catabolism and a Wide Distribution in Marine Environments

Functional Characterization of a L-2-Haloacid Dehalogenase From Zobellia galactanivorans DsijT Suggests a Role in Haloacetic Acid Catabolism and a Wide Distribution in Marine Environments

Impacts of glacial and sea-ice meltwater, primary production, and ocean CO2 uptake on ocean acidification state of waters by the 79 North Glacier and northeast Greenland shelf

Organic Alkalinity as an Important Constituent of Total Alkalinity and the Buffering System in River‐To‐Coast Transition Zones

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