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    Biogeochemical interactions control a temporal succession in the elemental composition of marine communities

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    Type
    Article
    Authors
    Martiny, Adam C. cc
    Talarmin, Agathe Anne Gaelle cc
    Mouginot, Céline
    Lee, Jeanette A.
    Huang, Jeremy S.
    Gellene, Alyssa G.
    Caron, David A.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Red Sea Research Center (RSRC)
    Date
    2015-11-23
    Online Publication Date
    2015-11-23
    Print Publication Date
    2016-03
    Permanent link to this record
    http://hdl.handle.net/10754/602296
    
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    Abstract
    Recent studies have revealed clear regional differences in the particulate organic matter composition and stoichiometry of plankton communities. In contrast, less is known about potential mechanisms and patterns of temporal changes in the elemental composition of marine systems. Here, we monitored weekly changes in environmental conditions, phytoplankton abundances, and particulate organic carbon, nitrogen, and phosphorus concentrations over a 3-yr period. We found that variation in the particulate organic matter (POM) concentrations and ratios were related to seasonal oscillations of environmental conditions and phytoplankton abundances. Periods with low temperature, high nutrient concentrations and a dominance of large phytoplankton corresponded to low C : N : P and vice-versa for warmer periods during the summer and fall. In addition to seasonal changes, we observed a multiyear increase in POM C : P and N : P that might be associated with the Pacific Decadal Oscillation. Finally, there was substantial short-term variability in all factors but similar linkages between environmental variability and elemental composition as observed on seasonal and interannual time-scales. Using a feed-forward neural network, we could explain a large part of the variation in POM concentrations and ratios based on changes in environmental conditions and phytoplankton abundances. The apparent links across all time-scales between changes in physics, chemistry, phytoplankton, and POM concentrations and ratios suggest we have identified key controls of the elemental composition of marine communities in this region.
    Citation
    Biogeochemical interactions control a temporal succession in the elemental composition of marine communities 2016, 61 (2):531 Limnology and Oceanography
    Sponsors
    We thank Steven Allison, Stephen Hatosy, Michael Louie, Erik Lee, Matthew Hernandez III, and Michael Lomas for help with the sampling and analysis. Financial support for this work was provided by the National Science Foundation Dimensions of Biodiversity (OCE-1046297) and Major Research Instrumentation programs (OCE-1126749) (to ACM), NSF Dimensions of Biodiversity (OCE-1136818) and National Oceanic and Atmospheric Administration subaward NA08OAR4320894 (to DAC), and the Undergraduate Research Opportunities Program at UCI (to JL and JH).
    Publisher
    Wiley
    Journal
    Limnology and Oceanography
    DOI
    10.1002/lno.10233
    Additional Links
    http://doi.wiley.com/10.1002/lno.10233
    ae974a485f413a2113503eed53cd6c53
    10.1002/lno.10233
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Red Sea Research Center (RSRC)

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