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Marine Plankton during the Polar Night: Environmental Predictors of Spatial Variability. | LitMetric

We studied the spatial patterns of the planktonic ecosystems at two Arctic sites strongly affected by Atlantic Inflow (FS, the Fram Strait; and BS, the Barents Sea). A high degree of similarity in the bacterial abundance (mean: 3.1 × 10 cells mL in FS vs. 3.5 × 10 cells mL in BS) was found, while other plankton characteristics were different. Bacterial biomass reached a maximum in BS (3.2-7.9 mg C m), while viral abundances tended to be higher in FS (2.0-5.7 × 10 particles mL). Larger bacterial cells were found in BS, suggesting the presence of different bacterial populations at both locations. The virus-to-bacteria ratio was significantly higher in FS than in BS (13.5 vs. 4.7). Chlorophyll concentration was extremely low (<0.25 mg m). The highest zooplankton abundance was in the surface layer (919 individuals m in FS vs. 602 ind. m in BS). Zooplankton biomass strongly varied (1-39 mg C m), with the maximum in BS. High proportions of boreal taxa in the total zooplankton abundance indicate the Atlantification of pelagic ecosystems in the Arctic. Plankton indicators are correlated with temperature, salinity, and sampling depth. Strong intercorrelations were found between major plankton groups, suggesting tight links in the studied plankton ecosystems.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10044718PMC
http://dx.doi.org/10.3390/biology12030368DOI Listing

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