Seasonal Variations of Water Quality in the Vostok Bay, Peter the Great Gulf, the Sea of Japan

Grigoryeva, N. I.; Zhuravel, E. V.; Mazur, Andrey Alexandrovich

doi:10.1134/s0097807820020062

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…The calcium content in the hemolymph could increase for several reasons. Firstly, Srednyaya Bay, from where the mollusks were caught, is a eutrophicated water area, in which the phosphorus content exceeded normal levels [97,98], and in some years, an increase in the number of species and density of green microalgae was observed [99]. Bivalves have been shown to actively absorb phosphorus from the environment [100,101], remineralizing it and converting it into soluble reactive phosphorus (SRP, a bioavailable form) [102].…”

Section: Discussionmentioning

confidence: 99%

Study of the Impact of the Parasitic Microalgae Coccomyxa parasitica on the Health of Bivalve Modiolus kurilensis

Tumas,

Slatvinskaya,

Kumeiko

et al. 2024

Microorganisms

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The invasion of bivalves by parasitic microalgae Coccomyxa is widespread and causes pathologies and dysfunctions of the organs, especially in the most valuable products: the mantle and the muscle. The pathogenesis of the disease remains completely unknown. In this study, based on a macroscopic examination of Modiolus kurilensis and microalgae count in each infected individual, four stages of disease development with characteristic pathognomonic symptoms were described. During the progression of the disease, the concentration of alkaline phosphatase, glucose, calcium, hemolytic and agglutinating activities, number of basophils, eosinophils, phagocytes, and cells with reactive oxygen species increased in the hemolymph, while number of agranulocytes, cells with lysosomes, dead hemocytes, total protein concentration, as well as the weight of mollusks decreased. In the nephridia and digestive gland, necrosis, invasion of Nematopsis sp., hemocyte infiltration, and fibrosis increased. The ratio of changed tubules and occurrence of granulocytomas increased in the digestive gland, while the base membrane, nephrocytes and concretions changed in the nephridia. This study helps establish the variability of these parameters under normal conditions and their alteration during the disease. Moreover, these findings can be used for veterinary monitoring of the state of bivalves in natural and aquaculture populations.

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Section: Discussionmentioning

confidence: 99%

Study of the Impact of the Parasitic Microalgae Coccomyxa parasitica on the Health of Bivalve Modiolus kurilensis

Tumas,

Slatvinskaya,

Kumeiko

et al. 2024

Microorganisms

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“…DO concentrations were determined using the Winkler method (Carpenter 1965). BOD5 was obtained from the difference in DO before and after a 5‐d dark incubation period (Grigoryeva et al 2020). Samples for DIC analysis were collected into 500‐mL glass bottles with ground‐glass stoppers, after which mercuric chloride was injected into the water to halt biological activity (Dickson et al 2007).…”

Section: Methodsmentioning

confidence: 99%

Microbially driven fate of terrigenous particulate organic matter in oceans

Zhang

Chen

Zheng

et al. 2022

Limnology & Oceanography

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A long-standing enigma in oceanography is why terrestrial organic matter is "missing" in the global ocean, despite the considerable discharge into it every year. Although some explanations, such as mineralogical composition, hydrodynamic processes, and priming effect, have been proposed, we hypothesize that the essential mechanism behind the missing organic matter is microbial processing, for which the underlying coupled geochemical, molecular, and genetic evidence is unknown. An ultra-large-volume, long-term river-seawater stratified simulation system was constructed to unravel the microbially driven fate of terrigenous particulate organic matter (POM) in oceans. Analysis of combining the molecular with POM chemical composition data suggests that Bacteroidetes could act as pioneers in the processing of terrigenous POM in oceans, degrading high-molecular-weight, high-carbon compounds such as polysaccharides. Remaining low-molecular-weight nitrogenous organic matter is subsequently degraded by Planctomycetes and Proteobacteria. Isotopic signals show that this preferential degradation causes a distinct "aging" effect of POM, and along with nitrification enhanced by remineralization, causes a decrease in the POM C : N ratio. Degradation of terrigenous POM and bacterial biomass biosynthesis leads to positive deviations in δ 15 N and δ 13 C. Relatively refractory hydrocarbons, aromatic compounds, and phenols are accumulated by microbial processes in this system. This study provides mechanistic insights into the missing chemical and isotopic signals and microbially driven fate of terrigenous POM in the ocean, with important implications for how riverine material input affects marine carbon and nitrogen cycling.Ongoing climate change is expected to lead to increased global river runoff (Labat et al. 2004;Andersson et al. 2015). Both ecological modeling and field research have indicated that the flux of terrestrial input to oceans increases with increased river runoff (Andersson et al. 2015). However, few molecular signals of abundant terrestrial organic matter are detected in marine environments (Hedges et al. 1997;Bianchi 2011;Kandasamy and Nath 2016), and only a trace of terrigenous organic matter (e.g., lignin) is present in the ocean (Opsahl and Benner 1997). A proposed explanation for this is a priming effect, in which the addition of labile organic carbon increases remineralization of the relatively refractory organic carbon (Bianchi 2011;Morling et al. 2017). Mineralogical composition and characteristics have also been proposed as important factors controlling the fate of continentally

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“…We used the Winkler method to measure the concentration of dissolved oxygen (DO) and the biological oxygen demand (BOD) (Carpenter, 1965). BOD 5 was the reduction in DO after a 5-day dark incubation period (Grigoryeva et al, 2020). The chemical oxygen demand (COD) was recorded using the alkaline potassium permanganate method (Liu et al, 2018).…”

Section: Sample Collection and Biogeochemical Analysismentioning

confidence: 99%

Terrigenous particles regulate autotrophic and heterotrophic microbial assembly and induce humic-like FDOM accumulation in seawater

Zhang

Liu

Chen³

et al. 2023

Front. Mar. Sci.

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Climate change can increase riverine discharge, which will promote terrigenous particle transportation and deeply impact microbe-mediated biogeochemical processes in the estuarine ecosystem. However, little is known about the long-term impacts of terrigenous particles on autotrophic and heterotrophic microbial community structures due to in situ continuous particle input. To solve this problem, a large-volume indoor incubation experiment was set up for over 40 days to simulate terrigenous particle input scenario. The activity and community structures of keystone groups were largely correlated with biochemical components derived from the terrigenous particles. The ecosystem was maintained by chemoautotrophic nitrifiers before the addition of terrigenous particles. The system was then functionally dominated by heterotrophic microorganisms after the input of terrigenous particles because terrigenous particles created environments that allowed heterotrophs to proliferate better than chemoautotrophs. The input of terrigenous particles increased the relative intensity of humic-like compounds mainly through releasing nutrients and biological labile organic matter to the seawater, which promoted the microbial transformation of organic matter. This study illustrates that terrigenous particles can impact the balance between heterotrophic and chemoautotrophic microbes and play an important role in humic-like compound transformation in seawater.

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Seasonal Variations of Water Quality in the Vostok Bay, Peter the Great Gulf, the Sea of Japan

Cited by 5 publications

References 11 publications

Study of the Impact of the Parasitic Microalgae Coccomyxa parasitica on the Health of Bivalve Modiolus kurilensis

Study of the Impact of the Parasitic Microalgae Coccomyxa parasitica on the Health of Bivalve Modiolus kurilensis

Microbially driven fate of terrigenous particulate organic matter in oceans

Terrigenous particles regulate autotrophic and heterotrophic microbial assembly and induce humic-like FDOM accumulation in seawater

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