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Pausch, Franziska; Bischof, Kai; Trimborn, Scarlett (2019): The Southern Ocean diatom Chaetoceros debilis is limited in growth by iron and manganese together. PANGAEA,, Supplement to: Pausch, Franziska; Bischof, Kai; Trimborn, Scarlett; Jesus, Bruno (2019): Iron and manganese co-limit growth of the Southern Ocean diatom Chaetoceros debilis. PLoS ONE, 14(9), e0221959,

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In some parts of the Southern Ocean (SO), even though low surface concentrations of iron (Fe) and manganese (Mn) indicate FeMn co-limitation, we still lack an understanding on how Mn and Fe availability influences SO phytoplankton ecophysiology. Therefore, this study investigated the effects of Fe and Mn limitation alone as well as their combination on growth, photophysiology and particulate organic carbon production of the bloom-forming Antarctic diatom Chaetoceros debilis. Our results clearly show that growth, photochemical efficiency and carbon production of C. debilis were co-limited by Fe and Mn as highest values were only reached when both nutrients were provided. Even though Mn-deficient cells had higher photochemical efficiencies than Fe-limited ones, they, however, displayed similar low growth and POC production rates, indicating that Mn limitation alone drastically impeded the cell's performance. These results demonstrate that similar to low Fe concentrations, low Mn availability inhibits growth and carbon production of C. debilis. As a result from different species-specific trace metal requirements, SO phytoplankton species distribution and productivity may therefore not solely depend on the input of Fe alone, but also critically on Mn acting together as important drivers of SO phytoplankton ecology and biogeochemistry.
co-limitation; diatom; Fe; growth; Mn; Photosynthesis; trace metals
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1TypeTypePausch, Franziska
2SpeciesSpeciesPausch, Franziska
3TreatmentTreatPausch, FranziskaIron/manganese treatment
4Maximum photochemical quantum yield of photosystem IIFv/FmPausch, Franziska
5Maximum photochemical quantum yield of photosystem II, standard deviationFv/Fm std dev±Pausch, Franziska
6Functional absorption cross sections of photosystem II reaction centersSigma PSIInm2Pausch, Franziska
7Functional absorption cross sections of photosystem II reaction centers, standard deviationSigma PSII std dev±Pausch, Franziska
8Phytoplankton growth ratePhytopl µ1/dayPausch, Franziska
9Growth rate, standard deviationµ std dev±Pausch, Franziska
10Production of particulate organic carbon per cellPOC prodpg/#/dayPausch, Franziska
11Particulate organic carbon, production, standard deviationPOC prod std dev±Pausch, Franziskapg C/cell/day
12Carbon, organic, particulate, per cellPOCpg/#Pausch, Franziska
13Particulate organic carbon content per cell, standard deviationPOC cont std dev±Pausch, Franziskapg C/cell
14Carbon/Nitrogen ratioC/Nmol/molPausch, Franziska
15Carbon/Nitrogen ratio, standard deviationC/N std dev±Pausch, Franziskamol/mol
16IrradianceEµmol/m2/sPausch, Franziska
17Electron transport rate, absoluteaETRe/PSII/sPausch, Franziska
18Electron transport rate, absolute, standard deviationaETR std dev±Pausch, Franziska
234 data points

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