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    Multiscale control of bacterial production by phytoplankton dynamics and sea ice along the western Antarctic Peninsula : a regional and decadal investigation

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    Ducklow et al J Mar Sys PDF MS in press.pdf (1.248Mb)
    Date
    2012-03-07
    Author
    Ducklow, Hugh W.  Concept link
    Schofield, Oscar M. E.  Concept link
    Vernet, Maria  Concept link
    Stammerjohn, Sharon E.  Concept link
    Erickson, Matthew  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5105
    As published
    https://doi.org/10.1016/j.jmarsys.2012.03.003
    Keyword
     Bacteria; Antarctica; Bacterial production; Primary production; Sea ice 
    Abstract
    We present results on phytoplankton and bacterial production and related hydrographic properties collected on nine annual summer cruises along the western Antarctic Peninsula. This region is strongly influenced by interannual variations in the duration and extent of sea ice cover, necessitating a decade-scale study. Our study area transitions from a nearshore region influenced by summer runoff from glaciers to an offshore, slope region dominated by the Antarctic Circumpolar Current. The summer bacterial assemblage is the product of seasonal warming and freshening following spring sea ice retreat and the plankton succession occurring in that evolving water mass. Bacterial production rates averaged 20 mgC m-2 d-1 and were a low (5%) fraction of the primary production (PP). There was significant variation in BP between regions and years, reflecting the variability in sea ice, Chlorophyll and PP. Leucine incorporation was significantly correlated (r2 ranging 0.2-0.7, p<0.001) with both chlorophyll and PP across depths, regions and years indicating strong phytoplankton-bacteria coupling. Relationships with temperature were variable, including positive, negative and insignificant relationships (r2 <0.2 for regressions with p<0.05). Bacterial production is regulated indirectly by variations in sea ice cover within regions and over years, setting the levels of phytoplankton biomass accumulation and PP rates; these in turn fuel BP, to which PP is coupled via direct release from phytoplankton or other less direct pathways.
    Description
    Author Posting. © The Author(s), 2012. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Journal of Marine Systems 98-99 (2012): 26-39, doi:10.1016/j.jmarsys.2012.03.003.
    Collections
    • Ecosystems Center
    Suggested Citation
    Preprint: Ducklow, Hugh W., Schofield, Oscar M. E., Vernet, Maria, Stammerjohn, Sharon E., Erickson, Matthew, "Multiscale control of bacterial production by phytoplankton dynamics and sea ice along the western Antarctic Peninsula : a regional and decadal investigation", 2012-03-07, https://doi.org/10.1016/j.jmarsys.2012.03.003, https://hdl.handle.net/1912/5105
     

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