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Biomass, production, and control of heterotrophic bacterioplankton during a late phytoplankton bloom in the Amundsen Sea Polynya, Antarctica

Title
Biomass, production, and control of heterotrophic bacterioplankton during a late phytoplankton bloom in the Amundsen Sea Polynya, Antarctica
Author
김성한
Keywords
Bacterial production; Microbial loop; Amundsen Sea; Polynya; Phaeocystis bloom; DISSOLVED ORGANIC-MATTER; MICROBIAL FOOD-WEB; MELTING GLACIERS FUELS; PINE ISLAND GLACIER; SOUTHERN-OCEAN; ROSS SEA; COASTAL WATERS; SPRING BLOOM; EUPHAUSIA-CRYSTALLOROPHIAS; PHAEOCYSTIS-ANTARCTICA
Issue Date
2016-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, v. 123, Page. 102-112
Abstract
We investigated the heterotrophic bacterial biomass and production in February 2012, in four habitats (a polynya, sea-ice zone, ice shelf, and the open sea) in the Amundsen Sea to determine the spatial distribution, controlling factors, and ecological role of the bacteria during a late phytoplankton bloom by Phaeocystis antarctica. Bacterial abundance (BA) and production (BP) were highest at the center of the polynya, and both were significantly correlated with phytoplankton biomass. BP accounted for average 17% of the organic carbon produced by phytoplankton primary production (PP), which is higher than the average BP:PP ratio reported in most open ocean. The abundance of heterotrophic nanoflagellates (HNF) was correlated with the BA, and the average bacteria:HNF ratio (260) was lower than the values reported in most marine environments (400-1000), including the Ross Sea Polynya (800). Evidence for a tight coupling of bacteria and phytoplanlcton activities on the one hand and intense HNF grazing on bacteria on the other could be found in the high BP:PP and low bacteria:HNF ratios, respectively. Interestingly, these data were accompanied by low particulate carbon export fluxes measured during the late Phaeocystis bloom. Together, these results indicated that the microbial loop plays a significant role in the bio-geochemical carbon cycle and food web processes in the Amundsen Sea Polynya. (C) 2015 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0967064515003239http://hdl.handle.net/20.500.11754/48928
ISSN
0967-0645; 1879-0100
DOI
10.1016/j.dsr2.2015.10.001
Appears in Collections:
RESEARCH INSTITUTE[E](부설연구소) > ETC
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