KOPRI Repository

Microzooplankton herbivory and community structure in the Amundsen Sea, Antarctica

Cited 21 time in wos
Cited 21 time in scopus
Microzooplankton herbivory and community structure in the Amundsen Sea, Antarctica
Yang, Eun Jin
Lee, Sang H.
Kang, Yong
Amundsen SeaGrazing rateGrowth rateMicrozooplanktonPolynya
Issue Date
Yang, Eun Jin, Lee, Sang H., Kang, Yong. 2016. "Microzooplankton herbivory and community structure in the Amundsen Sea, Antarctica". DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 123(1): 58-68.
We examined microzooplankton abundance, community structure, and grazing impact on phytoplankton in the Amundsen Sea, Western Antarctica, during the early austral summer from December 2010 to January 2011. Our study area was divided into three regions based on topography, hydrographic prop- erties, and trophic conditions: (1) the Oceanic Zone (OZ), with free sea ice and low phytoplankton biomass dominated by diatoms;(2) the Sea Ice Zone (SIZ), covered by heavy sea ice with colder water, lower salinity, and dominated by diatoms;and (3) the Amundsen Sea Polynya (ASP), with high phyto- plankton biomass dominated by Phaeocystis antarctica. Microzooplankton biomass and communities associated with phytoplankton biomass and composition varied among regions. Heterotrophic dino- ?agellates (HDF) were the most signi?cant grazers in the ASP and OZ, whereas ciliates co-dominated with HDF in the SIZ. Microzooplankton grazing impact is signi?cant in our study area, particularly in the ASP, and consumed 55.4?107.6% of phytoplankton production (average 77.3%), with grazing impact increasing with prey and grazer biomass. This result implies that a signi?cant proportion of the phyto- plankton production is not removed by sinking or other grazers but grazed by microzooplankton. Compared with diatom-based systems, Phaeocystis-based production would be largely remineralized and/or channeled through the microbial food web through microzooplankton grazing. In these waters the major herbivorous fate of phytoplankton is likely mediated by the microzooplankton population. Our study con?rms the importance of herbivorous protists in the planktonic ecosystems of high latitudes. In conclusion, microzooplankton herbivory may be a driving force controlling phytoplankton growth in early summer in the Amundsen Sea, particularly in the ASP.
Appears in Collections  
2014-2016, Physical and Bio-Geochemical Processes in the Amundsen Sea / Lee; Sang H. (PP15020; PP16020; PP14020)
2011-2016, Korea Polar Ocean in Rapid Transition (K-PORT) / Kang, Sung-Ho (PM11080; PM12020; PM13020; PM14040; PM14040; PM15040)
Files in This Item

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.