Viruses in the pelagic zone of the Barents Sea

Venger, M. P.; Shirokolobova, T. I.; Makarevich, Pavel R; Vodopianova, Veronika V.

doi:10.1134/s0012496612050110

Cited by 6 publications

(11 citation statements)

References 9 publications

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“…In the central Barents Sea, the number of virus-like particles ranged between 0.66 × 10 6 and 8.6 × 10 6 particles·mL −1 [ 21 ]. Similar counts were reported for AW, while in ArW, virioplankton abundance tended to be lower [ 24 , 25 ]. Autumn abundances of viruses in the upper 50 m layer in the Barents Sea [ 26 ] were similar to those found in the summer period [ 24 , 25 ].…”

Section: Discussionsupporting

confidence: 79%

“…The total abundance of bacteria was recorded to be 0.41 × 10 6 –4.1 × 10 6 cells·mL −1 , during summer in the central Barents Sea, and these counts were lower than the estimates reported for the northern Barents Sea, during the spring bloom [ 22 ] and summer periods [ 23 ]. Other studies found that the number of marine bacteria tended to be higher in AW compared to ArW in the late summer period [ 24 , 25 ]. There is only one study that reported autumn values of bacterioplankton abundance and biomass [ 26 ].…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have reported marked spatial and seasonal variations, in microbial characteristics in the Barents Sea. Spring and summer patterns of bacterioplankton have been investigated in the Marginal Ice Zone and in the northern Barents Sea [ 21 , 22 , 23 , 24 , 25 ]. The total abundance of bacteria was recorded to be 0.41 × 10 6 –4.1 × 10 6 cells·mL −1 , during summer in the central Barents Sea, and these counts were lower than the estimates reported for the northern Barents Sea, during the spring bloom [ 22 ] and summer periods [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…Spatial and seasonal differences may be explained by climatic variations, local hydrology, nutrient dynamics, and abundance of phytoplankton and zooplankton. In particular, previous studies conducted in the Barents Sea were performed during a warmer period (2010–2016) [ 24 , 25 , 26 ]. Other studies were focused on the spring and summer seasons, which are considered to be the most productive periods in the year, when biomass of phytoplankton was the highest [ 21 , 22 , 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…Information regarding the standing stocks of microbial plankton in the Barents Sea is, relatively, sparse. There are few studies dealing with bacterioplankton and virioplankton ecology in the region [ 21 , 22 , 23 , 24 , 25 , 26 ]. However, previous studies were focused on the western, central, and southern regions, in the spring and summer periods.…”

Section: Introductionmentioning

confidence: 99%

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Pelagic Bacteria and Viruses in a High Arctic Region: Environmental Control in the Autumn Period

Dvoretsky

Venger

Vashchenko

et al. 2022

Biology

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In the marine environment, bacteria and viruses play a significant role in carbon fluxes, remineralization processes, and the infection of various organisms. We performed a survey in the northeastern Barents Sea, a region adjacent to the Arctic Ocean, to investigate spatial patterns of microbial plankton, after the main productive period, in October 2020. Two main water masses occurred in the study region—colder Arctic Water and warmer Barents Sea Water, representing transformed Atlantic Water. Multivariate analyses detected patchiness in the horizontal distribution of bacteria and viruses, and their abundances showed no clear association with the water masses. There was an obvious vertical pattern in microbial concentration, with the highest estimates in the upper layers. Surface viral and bacterial abundance varied in a wide range (2.20 × 105–10.7 × 105 cells mL−1 and 0.86 × 106–14.98 × 106 particles mL−1, respectively) and were correlated with each other. Bacterioplankton was dominated by small-sized cells (<2 μm, 0.04–0.06 µm3), and the average volume of bacterial cells tended to increase toward the seafloor. The ratio of viral to bacterial abundance (VBR) was 11 ± 1 and did not differ between water masses and depth layers. VBR were higher, compared to summer values, suggesting a strong impact of viruses on bacterioplankton, after the main productive season. Redundancy and correlation analyses showed that inorganic nutrients (nitrate and phosphate) and organic carbon from zooplankton were most responsible for the total variability in the microbial parameters. Water temperature and salinity, also, had a measurable impact, but their influence was lower. Bacterial abundance was lower than in other seasons and regions of the Barents Sea, while viral abundance was comparable, suggesting a stronger viral impact on Arctic marine bacteria in the autumn season.

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