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Protist Community Grazing on Prokaryotic Prey in Deep Ocean Water Masses.

Rocke E, Pachiadaki MG, Cobban A, Kujawinski EB, Edgcomb VP - PLoS ONE (2015)

Bottom Line: Oceanic protist grazing at mesopelagic and bathypelagic depths, and their subsequent effects on trophic links between eukaryotes and prokaryotes, are not well constrained.Grazing was measured throughout the water column at three stations in the South Atlantic using fluorescently-labeled prey analogues.These results imply that protist grazing may be a significant source of labile organic carbon at certain meso- and bathypelagic depths.

View Article: PubMed Central - PubMed

Affiliation: Life Science Department, Hong Kong University of Science and Technology, Hong Kong SAR.

ABSTRACT
Oceanic protist grazing at mesopelagic and bathypelagic depths, and their subsequent effects on trophic links between eukaryotes and prokaryotes, are not well constrained. Recent studies show evidence of higher than expected grazing activity by protists down to mesopelagic depths. This study provides the first exploration of protist grazing in the bathypelagic North Atlantic Deep Water (NADW). Grazing was measured throughout the water column at three stations in the South Atlantic using fluorescently-labeled prey analogues. Grazing in the deep Antarctic Intermediate water (AAIW) and NADW at all three stations removed 3.79% ± 1.72% to 31.14% ± 8.24% of the standing prokaryote stock. These results imply that protist grazing may be a significant source of labile organic carbon at certain meso- and bathypelagic depths.

No MeSH data available.


Related in: MedlinePlus

Fig 3A: Eukaryote concentrations (#Euks ml-1) at 0 hours obtained through DAPI stained counts at stations 2, 7 and 23.Fig 3B: Prokaryote concentrations (# bacteria·mL-1) obtained through DAPI stained counts at stations 2, 7 and 23. Error bars represent the standard deviation of the mean (n = 2).
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pone.0124505.g003: Fig 3A: Eukaryote concentrations (#Euks ml-1) at 0 hours obtained through DAPI stained counts at stations 2, 7 and 23.Fig 3B: Prokaryote concentrations (# bacteria·mL-1) obtained through DAPI stained counts at stations 2, 7 and 23. Error bars represent the standard deviation of the mean (n = 2).

Mentions: The in situ prokaryote counts (Fig 3 and S1 Table) at time 0 ranged from 2.4 x105 (station 2) to 7.3 x105 cells per mL (station 7) at the deep chlorophyll maximum (DCM), 1.1 x105 (station 2) to 1.9x105 cells per mL (station 7) at 220m, 4.9 x104 (station 23) to 19.4 x104 cells per mL (station 2) at the AAIW, and 3.1 x104 (station 2) to 3.6 x104 cells per mL (station 23) at the NADW.


Protist Community Grazing on Prokaryotic Prey in Deep Ocean Water Masses.

Rocke E, Pachiadaki MG, Cobban A, Kujawinski EB, Edgcomb VP - PLoS ONE (2015)

Fig 3A: Eukaryote concentrations (#Euks ml-1) at 0 hours obtained through DAPI stained counts at stations 2, 7 and 23.Fig 3B: Prokaryote concentrations (# bacteria·mL-1) obtained through DAPI stained counts at stations 2, 7 and 23. Error bars represent the standard deviation of the mean (n = 2).
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4404134&req=5

pone.0124505.g003: Fig 3A: Eukaryote concentrations (#Euks ml-1) at 0 hours obtained through DAPI stained counts at stations 2, 7 and 23.Fig 3B: Prokaryote concentrations (# bacteria·mL-1) obtained through DAPI stained counts at stations 2, 7 and 23. Error bars represent the standard deviation of the mean (n = 2).
Mentions: The in situ prokaryote counts (Fig 3 and S1 Table) at time 0 ranged from 2.4 x105 (station 2) to 7.3 x105 cells per mL (station 7) at the deep chlorophyll maximum (DCM), 1.1 x105 (station 2) to 1.9x105 cells per mL (station 7) at 220m, 4.9 x104 (station 23) to 19.4 x104 cells per mL (station 2) at the AAIW, and 3.1 x104 (station 2) to 3.6 x104 cells per mL (station 23) at the NADW.

Bottom Line: Oceanic protist grazing at mesopelagic and bathypelagic depths, and their subsequent effects on trophic links between eukaryotes and prokaryotes, are not well constrained.Grazing was measured throughout the water column at three stations in the South Atlantic using fluorescently-labeled prey analogues.These results imply that protist grazing may be a significant source of labile organic carbon at certain meso- and bathypelagic depths.

View Article: PubMed Central - PubMed

Affiliation: Life Science Department, Hong Kong University of Science and Technology, Hong Kong SAR.

ABSTRACT
Oceanic protist grazing at mesopelagic and bathypelagic depths, and their subsequent effects on trophic links between eukaryotes and prokaryotes, are not well constrained. Recent studies show evidence of higher than expected grazing activity by protists down to mesopelagic depths. This study provides the first exploration of protist grazing in the bathypelagic North Atlantic Deep Water (NADW). Grazing was measured throughout the water column at three stations in the South Atlantic using fluorescently-labeled prey analogues. Grazing in the deep Antarctic Intermediate water (AAIW) and NADW at all three stations removed 3.79% ± 1.72% to 31.14% ± 8.24% of the standing prokaryote stock. These results imply that protist grazing may be a significant source of labile organic carbon at certain meso- and bathypelagic depths.

No MeSH data available.


Related in: MedlinePlus