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  • PANGAEA  (42)
  • Elsevier BV  (1)
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  • 1
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    Dissolved iron release from salp and krill fecal pellets and uptake of iron into Southern Ocean phytoplankton (2021)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: Dataset 1 shows the dissolved iron (dFe) values of an iron release experiment performed in the Southern Ocean at the tip of the Western Antarctic Peninsula. Krill and salp fecal pellets (FP) were incubated in filtered seawater (FSW) and seawater with phytoplankton (SWP). After 48 hours of incubation the dFe concentrations were measured. Numbers marked in red have been recognized as outliers (due to contamination or analytic error) and have been excluded from statistical analysis. Dataset 2 shows the uptake of iron into Southern Ocean phytoplankton cells from the pre-incubated water. The uptake was measured using the radiotracer 55Fe into two size classes of plankton (0.2-2µm and 〉2µm). Total dFe uptake is the sum of the two size classes. Lines marked in orange have been excluded from statistical analysis because respective dissolved iron concentrations were not reliable. The data for both datasets was collected between 04/11/2018 and 04/14/2018 (campaign PS112) at the Western Antarctic Peninsula (60° 44.455 S 54° 30.477 W) from a depth of 25 m. The data was collected in order to compare the bioavailability of iron from salp and krill FP to a Southern Ocean plankton community. All sampling steps were performed in trace metal clean ways.
    Keywords: fecal pellet; iron release; iron uptake; krill; Salp; Southern Ocean
    Type: dataset bundled publication
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Phytoplankton species composition under Fe and Mn limitation in the Drake Passage (2021)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: This study highlights the importance of manganese (Mn) next to iron (Fe) for growth of specific Southern Ocean phytoplankton groups. Two Fe-Mn bottle amendment experiments with two natural phytoplankton communities were performed during Polarstern expedition PS97 in 2016 in the Drake Passage. At two locations, sea water was pumped (using trace metals clean techniques) from 25m depth and used to fill polycarbonate bottles after having passed through a cleaned 200 μm mesh (removing large grazers). The Control treatment was the sampled seawater without any trace metals addition while the other three treatments were enriched with either FeCl3 alone (0.5 nM; +Fe treatment) or MnCl2 alone (1 nM; +Mn treatment) or both trace metals together (+FeMn treatment). All treatments were done in triplicate 2,5L PC bottles. All incubation bottles were maintained at 30 μmol photons m-2 s-1 under a 16:8 (light:dark) hour cycle at 1 ̊C. After on average 15 days, samples for chlorophyll a content, flow cytometry and light macroscopy were taken in order to detect FeMn co-limitation effect on species composition. In addition to the two experiments, 9 in situ stations of PS97 were also sampled for dissolved Fe, dissolved Mn as well as photophysiology and to complete this dataset, data from PS112 (2018) were also used. The results showed that only some members of the phytoplankton community were Fe-Mn co-limited, with the biogeochemical important diatom group Fragilariopsis and one subgroup of picoeukaryotes.
    Keywords: co-limitation; Phytoplankton composition; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Southern Ocean; SPP1158; trace elements
    Type: dataset publication series
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Elemental composition of the Southern Ocean key species Phaeocystis antarctica grown under altered iron and manganese supply (2023)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: An Fe-Mn bottle addition experiment was conducted in the laboratory to investigate the importance of manganese (Mn) next to iron (Fe) for growth, photophysiological adaptation and trace metal requirements of a specific Southern Ocean phytoplankton: Phaeocystis antarctica. The depleted treatment (-FeMn) was a natural Antarctic sea water (sampled during PS112 in 2018) without any trace metals addition while the other three treatments were enriched with either FeCl3 alone (2.8 nM; -Mn treatment) or MnCl2 alone (2.8 nM; -Fe treatment) or both trace metals together (Control treatment). All treatments were done in triplicate 4L PC bottles. All incubation bottles were maintained at 100 μmol photons m-2 s-1 under a 16:8 (light:dark) hour cycle at 1 ̊C. After on average 10 days, samples for cell counts, photophysiology, particulate organic carbon, pigments, trace metals chemistry and trace metals intracelluar quotas were taken in order to detect how FeMn low supply effect this specie.
    Keywords: carbon fixation; Fe:C ratio; growth; iron; manganese; photophysiology; Phytoplankton; Southern Ocean; Trace metal
    Type: dataset publication series
    Format: application/zip, 5 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Open Ocean and coastal phytoplankton communities of western Antarctic Peninsula and Drake Passage waters (2015)
    PANGAEA
    In:  Supplement to: Trimborn, Scarlett; Hoppe, Clara Jule Marie; Taylor, Bettina B; Bracher, Astrid; Hassler, Christel S (2015): Physiological characteristics of open ocean and coastal phytoplankton communities of Western Antarctic Peninsula and Drake Passage waters. Deep Sea Research Part I: Oceanographic Research Papers, 98, 115-124, https://doi.org/10.1016/j.dsr.2014.12.010
    Details
    Publication Date: 2024-07-19
    Description: Photophysiological processes as well as uptake characteristics of iron and inorganic carbon were studied in inshore phytoplankton assemblages of the Western Antarctic Peninsula (WAP) and offshore assemblages of the Drake Passage. Chlorophyll a concentrations and primary productivity decreased from in- to offshore waters. The inverse relationship between low maximum quantum yields of photochemistry in PSII (Fv/Fm) and large sizes of functional absorption cross sections (sigma PSII) in offshore communities indicated iron-limitation. Congruently, the negative correlation between Fv/Fm values and iron uptake rates across our sampling locations suggest an overall better iron uptake capacity in iron-limited pelagic phytoplankton communities. Highest iron uptake capacities could be related to relative abundances of the haptophyte Phaeocystis antarctica. As chlorophyll a-specific concentrations of humic-like substances were similarly high in offshore and inshore stations, we suggest humic-like substances may play an important role in iron chemistry in both coastal and pelagic phytoplankton assemblages. Regarding inorganic carbon uptake kinetics, the measured maximum short-term uptake rates (Vmax(CO2)) and apparent half-saturation constants (K1/2(CO2)) did not differ between offshore and inshore phytoplankton. Moreover, Vmax(CO2) and K1/2(CO2) did not exhibit any CO2-dependent trend over the natural pCO2 range from 237 to 507 µatm. K1/2(CO2) strongly varied among the sampled phytoplankton communities, ranging between 3.5 and 35.3 µmol/L CO2. While in many of the sampled phytoplankton communities, the operation of carbon-concentrating mechanisms (CCMs) was indicated by low K1/2(CO2) values relative to ambient CO2 concentrations, some coastal sites exhibited higher values, suggesting down-regulated CCMs. Overall, our results demonstrate a complex interplay between photophysiological processes, iron and carbon uptake of phytoplankton communities of the WAP and the Drake Passage.
    Keywords: AWI_PhyOce; Physical Oceanography @ AWI
    Type: dataset publication series
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    The Southern Ocean diatom Chaetoceros debilis is limited in growth by iron and manganese together (2019)
    PANGAEA
    In:  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, https://doi.org/10.1371/journal.pone.0221959
    Details
    Publication Date: 2024-07-19
    Description: 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.
    Keywords: Carbon, organic, particulate, per cell; Carbon, organic, particulate, production per cell; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; co-limitation; Diatom; Electron transport rate, absolute; Electron transport rate, absolute, standard deviation; Fe; Functional absorption cross sections of photosystem II reaction centers; Functional absorption cross sections of photosystem II reaction centers, standard deviation; growth; Growth rate, standard deviation; Irradiance; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Mn; Particulate organic carbon, production, standard deviation; Particulate organic carbon content per cell, standard deviation; Photosynthesis; Phytoplankton growth rate; Species; trace metals; Treatment; Type
    Type: dataset
    Format: text/tab-separated-values, 234 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Dissolved organic matter and trace metals in solid-phase extracts of water samples from the Elbe-Weser estuary (2018)
    PANGAEA
    In:  Supplement to: Ksionzek, Kerstin B; Zhang, Jing; Ludwichowski, Kai-Uwe; Wilhelms-Dick, Dorothee; Trimborn, Scarlett; Jendrossek, Thomas; Kattner, Gerhard; Koch, Boris P (2018): Stoichiometry, polarity, and organometallics in solid-phase extracted dissolved organic matter of the Elbe-Weser estuary. PLoS ONE, 13(9), e0203260, https://doi.org/10.1371/journal.pone.0203260
    Details
    Publication Date: 2024-07-19
    Description: Water samples were either acidified to pH 2 or processed without acidification (pH 8) prior solid-phase extraction (SPE). SPE was performed in quadruplicates. Thus, the given concentrations and elemental ratios of solid-phase extracts are average values of quadruplicate measurements (+/- standard deviation). Some values for SPE-V and SPE-As were below limit of detection (LOD).
    Keywords: Arsenic, extracted; Arsenic, extracted, standard deviation; BOT; Bottle, unknown; Carbon, organic, dissolved; Carbon, organic, dissolved, extracted; Carbon, organic, dissolved, extracted, standard deviation; Carbon/Arsenic ratio; Carbon/Arsenic ratio, standard deviation; Carbon/Chromium ratio; Carbon/Chromium ratio, standard deviation; Carbon/Cobalt ratio; Carbon/Cobalt ratio, standard deviation; Carbon/Copper ratio; Carbon/Copper ratio, standard deviation; Carbon/Nickel ratio; Carbon/Nickel ratio, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbon/Phosphorus ratio; Carbon/Phosphorus ratio, standard deviation; Carbon/sulfur ratio; Carbon/sulfur ratio, standard deviation; Carbon/Vanadium ratio; Carbon/Vanadium ratio, standard deviation; Chromium, extracted; Chromium, extracted, standard deviation; Cobalt; Cobalt, extracted; Cobalt, extracted, standard deviation; Copper; Copper, extracted; Copper, extracted, standard deviation; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; E1; Elbe_E1; Elbe Estuary; Event label; HE426; HE426/17-1; HE426/19-1; HE426/30-1; Heincke; ICP-MS, Elemental Scientific, seaFAST; Latitude of event; Longitude of event; Nickel, extracted; Nickel, extracted, standard deviation; Nitrogen, organic, dissolved, extracted; Nitrogen, organic, dissolved, extracted, standard deviation; Nitrogen, total dissolved; North Sea; pH; Phosphorus, organic, dissolved, extracted, standard deviation; Phosphorus, organic, extracted, dissolved; Salinity; Solid phase extraction (SPE); followed by High temperature catalytic oxidation (HTCO); Solid phase extraction (SPE) followed by ICP-MS; Station label; Sulfur, organic, dissolved, extracted; Sulfur, organic, dissolved, extracted, standard deviation; Vanadium, extracted; Vanadium, extracted, standard deviation; W1; W2; Weser_W1; Weser_W2; Weser, Germany, Europe
    Type: dataset
    Format: text/tab-separated-values, 526 data points
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    DATA PANGAEA
  • 7
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    Ocean acidification decreases the light-use efficiency in an Antarctic diatom under dynamic but not constant light, link to supplementary data (2015)
    PANGAEA
    In:  Supplement to: Hoppe, Clara Jule Marie; Holtz, Lena-Maria; Trimborn, Scarlett; Rost, Björn (2015): Ocean acidification decreases the light-use efficiency in an Antarctic diatom under dynamic but not constant light. New Phytologist, 207(1), 159-171, https://doi.org/10.1111/nph.13334
    Details
    Publication Date: 2024-07-19
    Description: There is increasing evidence that different light intensities strongly modulate the effects of ocean acidification (OA) on marine phytoplankton. The aim of the present study was to investigate interactive effects of OA and dynamic light, mimicking natural mixing regimes. The Antarctic diatom Chaetoceros debilis was grown under two pCO2 (390 and 1000 latm) and light conditions (constant and dynamic), the latter yielding the same integrated irradiance over the day. To characterize interactive effects between treatments, growth, elemental composition, primary production and photophysiology were investigated. Dynamic light reduced growth and strongly altered the effects of OA on primary production, being unaffected by elevated pCO2 under constant light, yet significantly reduced under dynamic light. Interactive effects between OA and light were also observed for Chl production and particulate organic carbon (POC) quotas. Response patterns can be explained by changes in the cellular energetic balance. While the energy transfer efficiency from photochemistry to biomass production (Phi_e,C) was not affected by OA under constant light, it was drastically reduced under dynamic light. Contrasting responses under different light conditions need to be considered when making predictions regarding a more stratified and acidified future ocean.
    Type: dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 48.3 kBytes
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    DATA PANGAEA
  • 8
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    (Table 1) Biological and chemical characteristics of surface water stations during Nathaniel B. Palmer cruise NBP06-08 to the Ross Sea (2010)
    PANGAEA
    In:  Supplement to: Tortell, Philippe Daniel; Trimborn, Scarlett; Li, Y; Rost, Björn; Payne, Christopher D (2010): Inorganic carbon utilization by Ross Sea phytoplankton across natural and experimental CO2 gradients. Journal of Phycology, 46(3), 433-443, https://doi.org/10.1111/j.1529-8817.2010.00839.x
    Details
    Publication Date: 2024-07-19
    Description: We present results from a field study of inorganic carbon (C) acquisition by Ross Sea phytoplankton during Phaeocystis-dominated early season blooms. Isotope disequilibrium experiments revealed that HCO3- was the primary inorganic C source for photosynthesis in all phytoplankton assemblages. From these experiments, we also derived relative enhancement factors for HCO3-/CO2 interconversion as a measure of extracellular carbonic anhydrase activity (eCA). The enhancement factors ranged from 1.0 (no apparent eCA activity) to 6.4, with an overall mean of 2.9. Additional eCA measurements, made using membrane inlet mass spectrometry (MIMS), yielded activities ranging from 2.4 to 6.9 U/[mg chl a] (mean 4.1). Measurements of short-term C-fixation parameters revealed saturation kinetics with respect to external inorganic carbon, with a mean half-saturation constant for inorganic carbon uptake (K1/2) of ~380 mM. Comparison of our early springtime results with published data from late-season Ross Sea assemblages showed that neither HCO3- utilization nor eCA activity was significantly correlated to ambient CO2 levels or phytoplankton taxonomic composition. We did, however, observe a strong negative relationship between surface water pCO2 and short-term 14C-fixation rates for the early season survey. Direct incubation experiments showed no statistically significant effects of pCO2 (10 to 80 Pa) on relative HCO3- utilization or eCA activity. Our results provide insight into the seasonal regulation of C uptake by Ross Sea phytoplankton across a range of pCO2 and phytoplankton taxonomic composition.
    Keywords: Carbon dioxide, partial pressure; Chlorophyll a; CORSACS II; Depth, bottom/max; Depth, top/min; DEPTH, water; Dominant species of live fauna; Event label; Latitude of event; Longitude of event; Nathaniel B. Palmer; NBP0608; NBP0608_SW14; NBP0608_SW20; NBP0608_SW21; NBP0608_SW23; NBP0608_SW28; NBP0608_SW32; NBP0608_SW35; NBP0608_SW38; NBP0608_SW41; NBP0608_SW42; NBP0608_SW43; NBP0608_SW44; NBP0608_SW45; NBP0608_SW46; NBP0608_SW47; NBP0608_SW48; Nitrate; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Ross Sea; Silicon dioxide; Southern Ocean; SPP1158; Surface water sample; SWS
    Type: dataset
    Format: text/tab-separated-values, 108 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Acidification and irradiance effect on the photo-physiological fitness, growth and carbon production of the Antarctic cryptophyte Geminigera cryophila (2019)
    PANGAEA
    In:  Supplement to: Trimborn, Scarlett; Thoms, Silke; Karitter, Pascal; Bischof, Kai (2019): Ocean acidification and high irradiance stimulate growth of the Antarctic cryptophyte Geminigera cryophila. Biogeosciences, 16, 2997–3008, https://doi.org/10.5194/bg-2019-97
    Details
    Publication Date: 2024-07-19
    Description: Ecophysiological studies on Antarctic cryptophytes to assess whether climatic changes such as ocean acidification and enhanced stratification affect their growth in Antarctic coastal waters in the future are lacking so far. This is the first study that investigates the combined effects of the increasing availability of pCO2 (400 and 1000 μatm) and irradiance (20, 200 and 500 μmol photons m-2 s-1) on growth, elemental composition and photo-physiology of the Antarctic cryptophyte Geminigera cryophila. Under ambient pCO2, this species was characterized by a pronounced sensitivity to increasing irradiance with complete growth inhibition at the highest light intensity. Interestingly, when grown under high pCO2 this negative light effect vanished, and it reached the highest rates of growth and particulate organic carbon production at the highest irradiance compared to the other tested experimental conditions. Our results for G. cryophila reveal beneficial effects of ocean acidification in conjunction with enhanced irradiance on growth and photosynthesis. Hence, cryptophytes such as G. cryophila may be potential winners of climate change, potentially thriving better in more stratified and acidic coastal waters and contributing in higher abundance to future phytoplankton assemblages of coastal Antarctic waters.
    Keywords: Carbon, organic, particulate, per cell; Carbon, organic, particulate, production per cell; Carbon, organic, particulate, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Connectivity between photosystem II; Connectivity between photosystem II, standard deviation; cryptophytes; Electron transport rate, absolute; Electron transport rate, absolute, standard deviation; Functional absorption cross sections of photosystem II reaction centers; Functional absorption cross sections of photosystem II reaction centers, standard deviation; Functional photosystem II reaction centers, per cell; Functional photosystem II reaction centers, standard deviation; Growth rate, standard deviation; irradiance; Irradiance; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Nitrogen, organic, particulate, per cell; Nitrogen, organic, particulate, per cell, standard deviation; Non photochemical quenching; Non photochemical quenching, standard deviation; Ocean acidification; Particulate organic carbon, production, standard deviation; Particulate organic nitrogen production, standard deviation; Phytoplankton growth rate; Production of particulate organic nitrogen; Recovery; Registration number of species; Re-oxidation time of the Qa acceptor; Re-oxidation time of the Qa acceptor, standard deviation; Southern Ocean; Species; Standard deviation; Treatment: light intensity; Treatment: partial pressure of carbon dioxide; Type; Uniform resource locator/link to reference
    Type: dataset
    Format: text/tab-separated-values, 640 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Seawater carbonate chemistry and photo-physiological fitness, growth and carbon production of the Antarctic cryptophyte Geminigera cryophila (2020)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: Ecophysiological studies on Antarctic cryptophytes to assess whether climatic changes such as ocean acidification and enhanced stratification affect their growth in Antarctic coastal waters in the future are lacking so far. This is the first study that investigates the combined effects of the increasing availability of pCO2 (400 and 1000 μatm) and irradiance (20, 200 and 500 μmol photons m-2 s-1) on growth, elemental composition and photo-physiology of the Antarctic cryptophyte Geminigera cryophila. Under ambient pCO2, this species was characterized by a pronounced sensitivity to increasing irradiance with complete growth inhibition at the highest light intensity. Interestingly, when grown under high pCO2 this negative light effect vanished, and it reached the highest rates of growth and particulate organic carbon production at the highest irradiance compared to the other tested experimental conditions. Our results for G. cryophila reveal beneficial effects of ocean acidification in conjunction with enhanced irradiance on growth and photosynthesis. Hence, cryptophytes such as G. cryophila may be potential winners of climate change, potentially thriving better in more stratified and acidic coastal waters and contributing in higher abundance to future phytoplankton assemblages of coastal Antarctic waters.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, organic, particulate, per cell; Carbon, organic, particulate, production per cell; Carbon, organic, particulate, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Connectivity between photosystem II; Connectivity between photosystem II, standard deviation; Cryptophyta; Electron transport rate, absolute; Electron transport rate, absolute, standard deviation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Functional absorption cross sections of photosystem II reaction centers; Functional absorption cross sections of photosystem II reaction centers, standard deviation; Functional photosystem II reaction centers, per cell; Functional photosystem II reaction centers, standard deviation; Geminigera cryophila; Growth/Morphology; Growth rate; Growth rate, standard deviation; Irradiance; Laboratory experiment; Laboratory strains; Light; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Nitrogen, organic, particulate, per cell; Nitrogen, organic, particulate, per cell, standard deviation; Non photochemical quenching; Non photochemical quenching, standard deviation; Not applicable; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, production, standard deviation; Particulate organic nitrogen production, standard deviation; Pelagos; pH; pH, standard deviation; Phytoplankton; Primary production/Photosynthesis; Production of particulate organic nitrogen; Recovery; Recovery, standard deviation; Registration number of species; Re-oxidation time of the Qa acceptor; Re-oxidation time of the Qa acceptor, standard deviation; Salinity; Single species; Species; Temperature, water; Type; Uniform resource locator/link to reference
    Type: dataset
    Format: text/tab-separated-values, 2200 data points
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