Iron organic speciation during the LOHAFEX experiment: Iron ligands release under biomass control by copepod grazing

Stable Composition of the Nano- and Picoplankton Community during the Ocean Iron Fertilization Experiment LOHAFEX

The iron fertilization experiment LOHAFEX was conducted in a cold-core eddy in the Southern Atlantic Ocean during austral summer. Within a few days after fertilization, a phytoplankton bloom developed dominated by nano- and picoplankton groups. Unlike previously reported for other iron fertilization experiments, a diatom bloom was prevented by iron and silicate co-limitation. We used 18S rRNA g...

Changes in the bacterial community during the iron fertilization experiment LOHAFEX

Selective Speciation of Ferric Iron by a New Heterocyclic Ligand

The synthesis and analytical applications of the new heterocyclic ligand are described. The complexation reaction of the ligand with some cations was studied in aqueous methanol at room temperature using the spectrophotometric method. Results revealed that only the absorption spectra of the Fe (III)–ligand complex show a high redshift of the absorption maximum in the aqueous methanol soluti...

The fate of biogenic iron during a phytoplankton bloom induced by natural fertilization: impact of copepod grazing

The impact of copepod grazing on Fe regeneration was investigated in a naturally iron fertilised area during KEOPS (Kerguelen Ocean and Plateau compared Study, Jan.-Feb. 2005). 55 Fe labelled natural plankton assemblages (< 200 μm) were offered as food to copepod predators sampled in the field (Calanus propinquus, Rhincalanus gigas, Metridia lucens and Oithona frigida). Diatoms (Eucampia antarc...

The Southern Ocean Iron RElease Experiment (SOIREE)* introduction and summary

This volume is dedicated to the Southern Ocean Iron RElease Experiment (SOIREE), the "rst in situ iron fertilisation experiment performed in the polar waters of the Southern Ocean. SOIREEwas an interdisciplinary study involving participants from six countries, and took place in February 1999 south of the Polar Front in the Australasian-Paci"c sector of the Southern Ocean. Approximately 3800kg o...