title: Protist Community Grazing on Prokaryotic Prey in Deep Ocean Water Masses.
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.
authors.affiliation: Life Science Department, Hong Kong University of Science and Technology, Hong Kong SAR.
authors.forename: Emma
authors.initials: E
authors.lastname: Rocke
authors.affiliation: Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States of America.
authors.forename: Maria G
authors.initials: MG
authors.lastname: Pachiadaki
authors.affiliation: Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States of America; Falmouth Academy Internship Program, Falmouth Academy, Falmouth, MA, United States of America.
authors.forename: Alec
authors.initials: A
authors.lastname: Cobban
authors.affiliation: Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States of America.
authors.forename: Elizabeth B
authors.initials: EB
authors.lastname: Kujawinski
authors.affiliation: Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States of America.
authors.forename: Virginia P
authors.initials: VP
authors.lastname: Edgcomb
mesh_terms: D000864:Antarctic Regions; D002734:Chlorophyll / Q000737:chemistry; D056890:Eukaryota / Q000378:metabolism*; D005456:Fluorescent Dyes / Q000737:chemistry; D020387:Food Chain; D005843:Geography; D017404:In Situ Hybridization, Fluorescence; D008027:Light; D008856:Microscopy, Fluorescence; D009792:Oceans and Seas; D010100:Oxygen / Q000737:chemistry; D010640:Phenothiazines; D011387:Prokaryotic Cells; D012623:Seawater; D013696:Temperature
chemical_list: D005456:Fluorescent Dyes; D010640:Phenothiazines; D002734:Chlorophyll; C005911:protizinic acid; D010100:Oxygen