Enzymatic biodegradation of high molecular weight polymers in the sediment–water interface in the coastal river estuary

Perliński, Piotr; Mudryk, Z.

doi:10.1002/rra.3308

Cited by 4 publications

(2 citation statements)

References 57 publications

(84 reference statements)

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“…Overall, the fastest rates of both organic matter degradation and microbial growth were observed in warmer conditions while a limited C reworking was detected at lower temperatures. This is a general pattern already observed in the water column (Arnosti et al 2011, Calvo-Díaz et al 2014 and at the sediment-water interface (Perliński and Mudryk 2018). Arnosti et al (2011) suggested the existence of a latitudinal gradient for the degradation of marine dissolved organic carbon: the warm superficial waters of tropical and subtropical areas showed faster degradative rates than their cold counterpart at higher latitudes.…”

Section: Discussionsupporting

confidence: 67%

Microbial processing of sedimentary organic matter at a shallow LTER site in the northern Adriatic Sea: an 8-year case study

Franzo¹,

Celussi²,

Bazzaro³

et al. 2019

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Benthic prokaryotes are the key-players in C-cycling at the sediment-seawater interface, one of the largest biologically active interfaces on Earth. Here, microbial-mediated processes, such as the degradation of organic matter and the incorporation of mobilized C into microbial biomass, depend on several factors such as environmental temperature and substrate availability, especially in shallow sediments at mid-high latitudes where seasonal fluctuations of these variables occur. In the present study, four degradative activities (β-glucosidase, lipase, chitinase and aminopeptidase), Heterotrophic C Production (HCP), Total Organic C (TOC), Total Nitrogen (TN) and Biopolymeric C (BPC) were investigated seasonally from April 2010 to April 2018 in the surface sediments of a shallow Long-Term Ecological Research (LTER) station of the northern Adriatic Sea. Significant temperature-dependences were described by Arrhenius-type equations for HCP and each of the degradative activities tested with the exception of aminopeptidase. The relatively low apparent Activation Energies suggested that these microbial-mediated processes were enhanced by the availability of palatable substrates over the study period. Nevertheless, a clear and tight dependence from such substrates was detected only for aminopeptidase, the most pronounced degradative activity observed. TN was identified by the stepwise multiple regression analysis as the environmental variable that mainly drove this exoenzymatic activity. Enhanced aminopeptidase rates mirrored peaks of TN that seemed, in turn, linked to the seasonal proliferation of benthic microalgae. By supplying prokaryotes with promptly available substrates, these autotrophs, represented mainly by diatoms, seemed to play an important role in the C-cycling regulation at the studied LTER station.

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Section: Discussionsupporting

confidence: 67%

Microbial processing of sedimentary organic matter at a shallow LTER site in the northern Adriatic Sea: an 8-year case study

Franzo¹,

Celussi²,

Bazzaro³

et al. 2019

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“…As is evident from Figure 3, lipase, followed by aminopeptidase, had the highest average levels of enzyme activity, while βand α-glucosidase had relatively low levels. Similar results (lipase > aminopeptidase > β-glucosidase > α-glucosidase) were obtained by Perli ński and Murdyk [41] in the estuary of the Słupia River. The high level of lipolytic enzyme activity has been frequently reported in various aquatic ecosystems [42][43][44]; in the studied section of the Brda, this was probably connected with high lipid concentration.…”

Section: Discussionsupporting

confidence: 87%

Patterns of Structural and Functional Bacterioplankton Metacommunity along a River under Anthropogenic Pressure

Małecka-Adamowicz

Kubera

2021

Sustainability

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Bacteria, an integral part of aquatic ecosystems, are responsible for the circulation of matter and flow of energy. Since bacterioplankton rapidly responds to any natural and human-induced disturbances in the environment, it can serve as a bioindicator of these changes. Knowing factors that shape the microbial community structure may help the sustainable management of the water environment. However, the identification of environmental signals affecting the structure and function of bacterioplankton is still a challenge. The study analyses the impact of environmental variables on basic microbial parameters, which determines the effectiveness of ecological processes in rivers. Measurements of bacterioplankton abundance (BA) and extracellular enzyme activity (EEA) were based on fluorescent markers. The bacterial community structure was determined by 16S rRNA gene amplicon sequencing (Illumina). The results indicate spatial variation in bacterioplankton abundance. Temporal variation was not significant. Lipase and aminopeptidase had the highest level of activity. EEA was not correlated with bacterial abundance but was significantly correlated with temperature. Moreover, differences in lipase, α-glucosidase and β-glucosidase activity levels between spring and summer were noted. At the same time, the location of sampling site had a significant influence on aminopeptidase activity. The taxonomic analysis of bacterioplankton communities in the Brda River indicated that, although different numbers of OTUs were recorded in the studied river sections, bacterioplankton biodiversity did not change significantly along the river with distance downstream. Anthropogenically modified river sections were characterized by the dominance of Flavobacterium (Bacterioidetes) and hgcl clade (Actinobacteria) taxa, known for their ability to produce extracellular enzymes. PCoA analysis revealed that the sites located in the lower river course (urban area) had the most similar bacterial community structure (β-diversity). The study provides new insight into the changes in microbial communities along the river and emphasizes the potential impact of anthropogenization on these processes.

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Organic matter stability and lability in terrestrial and aquatic ecosystems: A chemical and microbial perspective

Verrone,

Gupta,

Laloo

et al. 2024

Science of The Total Environment

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Enzymatic biodegradation of high molecular weight polymers in the sediment–water interface in the coastal river estuary

Cited by 4 publications

References 57 publications

Microbial processing of sedimentary organic matter at a shallow LTER site in the northern Adriatic Sea: an 8-year case study

Microbial processing of sedimentary organic matter at a shallow LTER site in the northern Adriatic Sea: an 8-year case study

Patterns of Structural and Functional Bacterioplankton Metacommunity along a River under Anthropogenic Pressure

Organic matter stability and lability in terrestrial and aquatic ecosystems: A chemical and microbial perspective

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