Physical-biological coupling in the Amundsen Sea, Antarctica: Influence of physical factors on phytoplankton community structure and biomass
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- Physical-biological coupling in the Amundsen Sea, Antarctica: Influence of physical factors on phytoplankton community structure and biomass
- Lee, Youngju
Yang, Eun Jin
- Amundsen Sea; Diatom; Phaeocystis antarctica; Phytoplankton; Polynya; Araon
- Issue Date
- Lee, Youngju, et al. 2016. "Physical-biological coupling in the Amundsen Sea, Antarctica: Influence of physical factors on phytoplankton community structure and biomass". Deep？Sea Research I, 117(1): 51-60.
- To understand the spatial distribution of phytoplankton communities in various habitats in the Amundsen Sea, western Antarctica, a field survey was conducted at 15 stations during the austral summer, from December 2013
to January 2014. Water samples were analyzed by microscopy. We found high phytoplankton abundance and biomass in the Amundsen Sea polynya (ASP). Their strong positive correlation with water temperature suggests
that phytoplankton biomass accumulated in the surface layer of the stratified polynya. In the ASP, the predominant phytoplankton species was Phaeocystis antarctica, while diatoms formed a major group in the sea
ice zone, especially Fragilariopsis spp., Chaetoceros spp., and Proboscia spp. Although this large diatom abundance sharply decreased just off the marginal sea ice zone, weakly silicified diatoms, due to their high
buoyancy, were distributed at almost all stations on the continental shelf. Dictyocha speculum appeared to favor the area between the marginal sea ice zone and the ASP in contrast to cryptophytes and picophytoplankton,
whose abundance was higher in the area between the continental shelf and the open ocean of Amundsen Sea.
Several environmental factors were found to affect the spatial variation of phytoplankton species, but the
community structure appeared to be controlled mainly by the seawater density related to sea-ice melting and
water circulation in the Amundsen Sea.
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