Nitrogen uptake by phytoplankton in the Atlantic sector of the Southern Ocean during late austral summer
- Joubert, W. R.
- Thomalla, S. J.
- Waldron, H. N.
- Lucas, M. I.
- Boye, M.
- Le Moigne, Frederic A. C.
- Planchon, F.
- Speich, S.
DOIAbstract
As part of the Bonus-GoodHope (BGH) campaign, 15N-labelled nitrate, ammonium and urea uptake measurements were made along the BGH transect from Cape Town to ~60° S in late austral summer, 2008. Our results are categorised according to distinct hydrographic regions defined by oceanic fronts and open ocean zones. High regenerated nitrate uptake rate in the oligotrophic Subtropical Zone (STZ) resulted in low f-ratios (f = 0.2) with nitrogen uptake being dominated by ρurea, which contributed up to 70 % of total nitrogen uptake. Size fractionated chlorophyll data showed that the greatest contribution (>50 %) of picophytoplankton (<2 μm) were found in the STZ, consistent with a community based on regenerated production. The Subantarctic Zone (SAZ...
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