Trophic interactions of micro- and mesozooplankton in the Amundsen Sea polynya and adjacent sea ice zone during austral late summer
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- Trophic interactions of micro- and mesozooplankton in the Amundsen Sea polynya and adjacent sea ice zone during austral late summer
- Other Titles
- 아문젠해 폴리니아와 주변해빙역에서 소형 및 중형 동물플랑크톤의 영양관계
- Yang, Eun Jin
Lee, Sang H.
- Issue Date
- Yang, Eun Jin, Lee, Younjoo, Lee, Sang H.. 2019. "Trophic interactions of micro- and mesozooplankton in the Amundsen Sea polynya and adjacent sea ice zone during austral late summer". PROGRESS IN OCEANOGRAPHY, 174(1): 117-130.
- To elucidate the trophic link between micro- and mesozooplankton in the Amundsen Sea polynya (ASP) and
adjacent sea ice zone, we estimated the impact of microzooplankton grazing on major phytoplankton groups, as
well as the diet composition, ingestion rate, and prey selectivity of two copepods and Euphausia crystallorophias
larvae on microbial communities during the late summer. Phaeocystis antarctica, which was ingested by microand
mesozooplankton, comprised most phytoplankton biomass. Herbivorous microzooplankton consumed at
least half of the phytoplankton production, but the microzooplankton grazing may not contribute strongly to the
decline of the phytoplankton bloom. Three mesozooplankton species (Calanoides acutus, Metridia gerlachei, and E.
crystallorophias larvae) preferentially grazed on ciliates and heterotrophic dinoflagellates (HDF) with sizes from
20 to>100 μm over phytoplankton. Although microzooplankton comprised only an average of 41.7 ± 3.2% o
the total carbon available in the natural prey pool, they accounted for an average of 75.4 ± 2.9% of total carbon
ingested by copepods and krill larvae. Heterotrophic food sources made up a substantial proportion of mesozooplankton
diets, with strong positive selection for microzooplankton at most locations regardless of phytoplankton
size and type. In particular, HDF comprised the major dietary component of mesozooplankton in the
study area. The presence of mesozooplankton reduced the grazing pressure on P. antarctica and diatoms through
predation on herbivorous microzooplankton. Approximately half of the primary production capacity may have
indirectly reached mesozooplankton through microzooplankton consumption. Thus, strongly selective feeding
behavior and higher grazing pressure on microzooplankton indicated the importance of microheterotrophic
pathways through strong trophic coupling between mesozooplankton and the microbial food web during the
decline of phytoplankton bloom. In the highly productive ASP system, food web structure can be classified as
multivorous, whereby herbivorous and omnivorous modes both play significant roles in carbon export, enhancing
the efficiency of the pelagic food web.
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