Fjords of the western and northern regions of Svalbard harbour distinct bacterioplankton community structures

Venkatachalam, S.; Gopinath, Anu; Krishnan, K. P.

doi:10.1007/s11274-022-03493-0

Cited by 4 publications

(2 citation statements)

References 43 publications

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“…Svalbard fjord sediments are affected by the different physical-chemical properties (temperature, nutrient content, light and dissolved oxygen) and hydrodynamic patterns of the overlaying water column, which in turn affect the species composition of the bacterial community [29,30]. In the water column of Hornsund fjord, higher bacterial numbers and biomass than in Kongsfjorden were reported [31], suggesting a better adaptation of Arctic bacteria to the low water temperatures and availability of organic substrates.…”

Section: Culturable Heterotrophic Bacterial Abundance and Organic Mat...mentioning

confidence: 99%

Svalbard Fjord Sediments as a Hot-Spot of Functional Diversity and a Reservoir of Antibiotic Resistance (AREX Cruise 2021)

Caruso,

Rappazzo,

Maimone

et al. 2024

Preprint

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The benthic matrix acts as a key natural archive where the memory of long-term timescale environmental changes is recorded. Some ecological and chemical features of fjord sediments were explored during the AREX cruise carried out in the Svalbard archipelago in summer 2021. The activity rates of the enzymes leucine aminopeptidase (LAP), beta-glucosidase (GLU) and alkaline phosphatase (AP) and community-level physiological profiles (CLPP) were studied with the aim of determining the functional diversity of the benthic microbial community, while bacterial isolates were screened for their susceptibility to antibiotic molecules in order to explore the role of these extreme environments as potential reservoirs of antibiotic resistance. Enzyme activity rates were obtained by fluorogenic substrates, CLPP by Biolog Ecoplates; antibiotic susceptibility assays were performed through the standard disk diffusion method. Spatial trends observed in the functional profiles of the microbial community suggested the variability in the microbial community composition, presumably related to the patchy distribution of organic substrates. Complex Carbon sources, carbohydrates and amino acids were the organic polymers preferentially metabolized by the microbial community. Multiple resistance to ampicillin, clindamycin and gentamycin was detected in all the sampled sediments, excepting in the southern Hornsund area, stressing the role of sediments as a potential reservoir of chemical wastes ascribable to antibiotic residuals. This study provides new insights on the health status of fjord sediments of West Spitsbergen applying a dual ecological and biochemical approach. Microbial communities in the fjord sediments showed globally a good functional diversity, suggesting their versatility to rapidly react to changing conditions.

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Section: Culturable Heterotrophic Bacterial Abundance and Organic Mat...mentioning

confidence: 99%

Svalbard Fjord Sediments as a Hot-Spot of Functional Diversity and a Reservoir of Antibiotic Resistance (AREX Cruise 2021)

Caruso,

Rappazzo,

Maimone

et al. 2024

Preprint

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“…Data on microbial distribution and its role in this Arctic area are mostly fragmentary, due to the lack of comprehensive studies, as evidenced by recent literature reviews [29,40]. Comparatively more limited is the knowledge of the taxonomic composition and metabolic potential of the complex microbiota inhabiting the Ny-Ålesund harbour [41][42][43], where benthic and pelagic domains have never been investigated simultaneously. Originally, Ny-Ålesund was born as a coal mining community, which was decommissioned since the 1960s after a large accident; therefore, the soil of this site is affected by coal waste materials and heavy metals from mining operations [44].…”

Section: Introductionmentioning

confidence: 99%

A Snapshot of the Taxonomic Composition and Metabolic Activity of the Microbial Community in an Arctic Harbour (Ny-Ålesund, Kongsfjorden, Svalbard)

Cappello

Smedile

Caruso

et al. 2023

JMSE

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Within the Svalbard archipelago, Kongsfjorden is an important marine ecosystem that is recognised as one of the main representative Arctic glacial fjords. Prokaryotic organisms are key drivers of important ecological processes such as carbon fluxes, nutrient mineralisation, and energy transfer, as well as sentinels of environmental pollution, especially in sediments, that are a repository of contaminants. In some areas of the Arctic, the structure and metabolic activity of the microbial community in the organic matter turnover and globally in the functioning of the benthic domain are mostly still unknown. A snapshot of the main microbial parameters such as bacterial abundance (by microscopic and plate counts), structure (by 16S rRNA sequencing), and metabolic activity was provided in Ny-Ålesund harbour, contextually in seawater and sediment samples. Fluorogenic substrates were used to assess the microbial ability to utilise organic substrates such as proteins, polysaccharides, and organic phosphates through specific enzymatic assays (leucine aminopeptidase—LAP, beta-glucosidase—ß-GLU, and alkaline phosphatase—AP, respectively). The metabolic profiles of psychrophilic heterotrophic bacterial isolates were also screened using a qualitative assay. The phylogenetic analysis of the microbial community revealed that Proteobacteria prevailed among the observed taxonomic groups. Several of the observed sequences were assigned to clones found in harbours, microbial biofilms, antifouling paints, or oil-polluted facilities of cold environments, highlighting a signature of human pressure on the polar habitat of Ny-Ålesund harbour.

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Recent Indian contribution in the realms of polar studies

Pant,

Meloth,

Dimri

et al. 2024

Proc.Indian Natl. Sci. Acad.

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Fjords of the western and northern regions of Svalbard harbour distinct bacterioplankton community structures

Cited by 4 publications

References 43 publications

Svalbard Fjord Sediments as a Hot-Spot of Functional Diversity and a Reservoir of Antibiotic Resistance (AREX Cruise 2021)

Svalbard Fjord Sediments as a Hot-Spot of Functional Diversity and a Reservoir of Antibiotic Resistance (AREX Cruise 2021)

A Snapshot of the Taxonomic Composition and Metabolic Activity of the Microbial Community in an Arctic Harbour (Ny-Ålesund, Kongsfjorden, Svalbard)

Recent Indian contribution in the realms of polar studies

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