Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410604c&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 10, CiteID L10604
Mathematics
Logic
5
Oceanography: Biological And Chemical: Microbiology And Microbial Ecology (0465), Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling (0470, 1050), Oceanography: Biological And Chemical: Phytoplankton
Scientific paper
Prochlorococcus is ubiquitous in tropical oceans, but its biogeochemical role is not well constrained. For example, cultured Prochlorococcus clones do not grow on NO3 -, but these cultured clones may only represent 10-15% of the natural population variance resulting in a biased biogeochemical role. We report NO3 -, NO2 -, NH4 + and urea uptake rates for flow-cytometrically sorted Sargasso Sea Prochlorococcus populations. Reduced nitrogen substrates accounted for most, 90-95%, of the measured nitrogen uptake, but these populations also directly assimilate a significant fraction of NO3 -, 5-10% a finding in stark contrast to conclusions drawn from culture studies. The observed population-specific NO3 - uptake rates compare favorably with both net Prochlorococcus population growth rates and diapycnal NO3 - fluxes. We hypothesize that while reduced nitrogen supports overall high growth rates, balancing high grazing mortality, the net seasonal Prochlorococcus population growth is supported by NO3 - assimilation and that Prochlorococcus contributes to new production in the oligotrophic ocean.
Casey John R.
Lomas Michael W.
Mandecki Joanna
Walker Donald E.
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