Rocke Emma, Pachiadaki Maria G, Cobban Alec, Kujawinski Elizabeth B, Edgcomb Virginia P
Life Science Department, Hong Kong University of Science and Technology, Hong Kong SAR.
Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States of America.
PLoS One. 2015 Apr 20;10(4):e0124505. doi: 10.1371/journal.pone.0124505. eCollection 2015.
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.
海洋原生生物在中深层和深层的摄食情况，以及它们随后对真核生物和原核生物之间营养联系的影响，目前还没有得到很好的界定。最近的研究表明，在中深层深度，原生生物的摄食活动高于预期。本研究首次对北大西洋深层水（NADW）中的原生生物摄食进行了探索。在南大西洋的三个站点，利用荧光标记的猎物类似物对整个水柱中的摄食情况进行了测量。在所有三个站点，南极中层水（AAIW）和NADW深层的摄食活动消耗了现存原核生物总量的3.79%±1.72%至31.14%±8.24%。这些结果表明，在某些中深层和深层深度，原生生物的摄食可能是不稳定有机碳的一个重要来源。
