High rates of nitrogen fixation during an in-situ phosphate release experiment in the Eastern Mediterranean Sea

Details High rates of nitrogen fixation during an in-situ phosphate release experiment in the Eastern Mediterranean Sea High rates of nitrogen fixation during an in-situ phosphate release experiment in the Eastern Mediterranean Sea

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3310607r&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 10, CiteID L10607

Mathematics

Logic

7

Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Microbiology And Microbial Ecology (0465), Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling (0470, 1050), Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041)

Scientific paper

Nitrogen fixation and δ15N were measured within a warm-core eddy during an in-situ phosphate experiment (CYCLOPS) in the Eastern Mediterranean, with experimental procedures performed on unconcentrated, bulk water. Mean rates of 129 nmol-N L-1d-1 were measured at control stations in the absence of phosphate (<2 nmolL-1), inferring the bioavailability of DOP to diazotrophs. In P-enriched waters, rates increased by 48% to 197 nmol-N L-1d-1 five days after addition. δ15N of particulate material was homogenous throughout the upper mixed layer, but changed with time at both amended and control stations from +3.8‰ on day 1, to -0.6‰ on day 4-5 before returning to +3.1‰ after 9 days. This trend matched the observed response in other components of the biota and biogeochemistry in the P-enriched patch. In-vitro addition experiments indicated that diazotrophy was not limited by Fe availability.

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