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  • 1
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    The physiological response of an Antarctic key phytoplankton species to low iron and manganese concentrations (2023)
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2024-03-12
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Iron (Fe) and manganese (Mn) availability and the divergent requirements of phytoplankton species were recently shown to be potential important drivers of Southern Ocean community composition. Knowledge about Antarctic phytoplankton species requirements for Fe and Mn remains, however, scarce. By performing laboratory experiments and additional calculations of the photosynthetic electron transport, we investigated the response of the ecologically important species 〈italic toggle="no"〉Phaeocystis antarctica〈/italic〉 under a combination of different Fe and Mn concentrations. Fe deprivation alone provoked typical physiological characteristics of Fe limitation in 〈italic toggle="no"〉P. antarctica〈/italic〉 (e.g., lowered growth and photosynthetic efficiency). In comparison, under Mn deprivation alone, the growth and carbon production of 〈italic toggle="no"〉P. antarctica〈/italic〉 were not impacted. Its tolerance to cope with low Mn concentrations resulted from an efficient photoacclimation strategy, including a higher number of active photosystems II through which fewer electrons were transported. This strategy allowed us to maintain similar high growth and carbon production rates as FeMn‐enriched cells. Due to its low Mn requirement, 〈italic toggle="no"〉P. antarctica〈/italic〉 performed physiologically as Fe‐deprived cells under the combined depletion of Fe and Mn. Hence, our study reveals that different from other Southern Ocean phytoplankton species, 〈italic toggle="no"〉P. antarctica〈/italic〉 possesses a high capacity to cope with natural low Mn concentrations, which can facilitate its dominance over others, potentially explaining its ecological success across the Southern Ocean.〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: https://doi.org/10.1594/PANGAEA.944462
    Keywords: ddc:577.7 ; Southern Ocean ; Antarctic phytoplankton ; Trace metal ; photophysiology ; carbon fixation
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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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: 2023-04-05
    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
  • 3
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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: 2023-04-05
    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
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 4
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    Chlorophyll a, primary production and nutrients during POLARSTERN cruise ANT-XXVIII/2 (2017)
    PANGAEA
    In:  Supplement to: Hoppe, Clara Jule Marie; Klaas, Christine; Ossebaar, Sharyn; Soppa, Mariana A; Cheah, Wee; Laglera, Luis Miguel; Santos-Echeandía, Juan; Rost, Björn; Wolf-Gladrow, Dieter A; Bracher, Astrid; Hoppema, Mario; Strass, Volker H; Trimborn, Scarlett (2017): Controls of primary production in two phytoplankton blooms in the Antarctic Circumpolar Current. Deep Sea Research Part II: Topical Studies in Oceanography, 138, 63-73, https://doi.org/10.1016/j.dsr2.2015.10.005
    Details
    Publication Date: 2023-10-18
    Description: The Antarctic Circumpolar Current has a high potential for primary production and carbon sequestration through the biological pump. In the current study, two large-scale blooms observed in 2012 during a cruise with R.V. Polarstern were investigated with respect to phytoplankton standing stocks, primary productivity and nutrient budgets. While net primary productivity was similar in both blooms, chlorophyll a -specific photosynthesis was more efficient in the bloom closer to the island of South Georgia (39 °W, 50 °S) compared to the open ocean bloom further east (12 °W, 51 °S). We did not find evidence for light being the driver of bloom dynamics as chlorophyll standing stocks up to 165 mg/m² developed despite mixed layers as deep as 90 m. Since the two bloom regions differ in their distance to shelf areas, potential sources of iron vary. Nutrient (nitrate, phosphate, silicate) deficits were similar in both areas despite different bloom ages, but their ratios indicated more pronounced iron limitation at 12 °W compared to 39 °W. While primarily the supply of iron and not the availability of light seemed to control onset and duration of the blooms, higher grazing pressure could have exerted a stronger control toward the declining phase of the blooms.
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 5
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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: 2023-12-12
    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
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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: 2024-01-12
    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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    Acidification and iron limitation effects on the photophysiology, growth, carbon production, and cellular pigment and trace metal quotas of the Antarctic phytoplankton Geminigera cryophila and Pseudo‐nitzschia subcurvata (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-11
    Description: Ecophysiological studies looking at the combined effects of ocean acidification (OA) and iron (Fe) availability on Southern Ocean (SO) phytoplankton are still limited. To gain a better mechanistic understanding of how the two ecologically important SO phytoplankton groups cope with OA and Fe limitation, we conducted laboratory incubation experiments on the Antarctic cryptophyte Geminigera cryophila and the diatom Pseudo‐nitzschia subcurvata. Geminigera cryophila (CCMP 2564) was isolated from the Southern Ocean and obtained from Matt Johnson's Laboratory of Protistan Ecology at the Woods Hole Oceanography Institute, United States. Pseudo-nitzschia subcurvata was isolated from the Southern Ocean by P. Assmy during Polarstern expedition ANT- XXI/4. Both species were grown at 2°C under different pCO2 (400 vs. 900 μatm) and Fe (0.6 vs. 1.2 nM) conditions. For P. subcurvata, an additional high pCO2 level was applied (1400 μatm). For both species, growth, photophysiology, cellular quotas of particulate organic carbon, trace metals and pigments were assessed. Our study reveals that Fe limitation was detrimental for the growth of G. cryophila and suppressed the positive OA effect. The diatom was efficient in coping with low Fe, but was stressed by OA while both factors together strongly impacted its growth. The distinct physiological response of both species to OA and Fe limitation explains their occurrence in the field. Based on our results, Fe availability is an important modulator of OA effects on SO phytoplankton, with different implications on the occurrence of cryptophytes and diatoms in the future.
    Keywords: Alloxanthin; Alloxanthin, standard deviation; Carbon, organic, particulate; Carbon, organic, particulate, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Chlorophyll a; Chlorophyll a, standard deviation; Chlorophyll c2; Chlorophyll c2, standard deviation; Cobalt/Carbon ratio; Cobalt/Carbon ratio, standard deviation; Connectivity between photosystem II; Connectivity between photosystem II, standard deviation; Copper/Carbon ratio; Copper/Carbon ratio, standard deviation; cryptophytes; culture experiment; Diadinoxanthin; Diadinoxanthin, standard deviation; diatoms; Electron transport rate, absolute; Electron transport rate, absolute, standard deviation; Elemental analyzer, HEKAtechGmbH, Euro EA; Fluorometer, fast repetition rate; FRRF; Fucoxanthin; Fucoxanthin, 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; Functional photosystem II reaction centers, standard deviation; Growth rate, standard deviation; Inductively coupled plasma mass spectrometer (ICP-MS), Attom, Nu Instruments; Iron, cellular quota; Iron, cellular quota, standard deviation; Iron/Carbon ratio; Iron/Carbon ratio, standard deviation; Iron limitation; Irradiance; Laboratory experiment; Light microscopy (Utermöhl 1958); Light saturation point; Light saturation point, standard deviation; Light use efficiency; Manganese/Carbon ratio; Manganese/Carbon ratio, standard deviation; Maximal electron transport rate, standard deviation; Maximum light utilization efficiency, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, recovery; Maximum photochemical quantum yield of photosystem II, recovery, standard deviation; Maximum photochemical quantum yield of photosystem II, standard deviation; Nitrogen, organic, particulate; 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 carbon; Registration number of species; Reverse phase HPLC (High Performance Liquid Chromatography); Southern Ocean; Species; Treatment: dissolved iron; Treatment: partial pressure of carbon dioxide; Type of study; Uniform resource locator/link to reference; Zinc/Carbon ratio; Zinc/Carbon ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 3068 data points
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    DATA PANGAEA
  • 8
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    Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica (2017)
    PANGAEA
    In:  Supplement to: Trimborn, Scarlett; Thoms, Silke; Brenneis, Tina; Heiden, Jasmin; Beszteri, Sara; Bischof, Kai (2017): Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica. Physiologia Plantarum, https://doi.org/10.1111/ppl.12539
    Details
    Publication Date: 2024-03-15
    Description: To better understand the impact of ocean acidification (OA) and changes in light availability on Southern Ocean phytoplankton physiology, we investigated the effects of pCO2 (380 and 800 µatm) in combination with low and high irradiance (20 or 50 and 200 µmol photons/m2/s) on growth, particulate organic carbon (POC) fixation and photophysiology in the three ecologically relevant species Chaetoceros debilis, Fragilariopsis kerguelensis and Phaeocystis antarctica. Irrespective of the light scenario, neither growth nor POC per cell was stimulated by OA in any of the tested species and the two diatoms even displayed negative responses in growth (e.g. C. debilis) or POC content (e.g. F. kerguelensis) under OA in conjunction with high light. For both diatoms, also maximum quantum yields of PSII (Fv/Fm) were decreased under these conditions, indicating lowered photochemical efficiencies. To counteract the negative effects by OA and high light, the two diatoms showed diverging photoacclimation strategies. While cellular chlorophyll a and fucoxanthin contents were enhanced in C. debilis to potentially maximize light absorption, F. kerguelensis exhibited reduced chlorophyll a per cell, increased disconnection of antennae from photosystem II reaction centers and strongly lowered absolute electron transport rates (ETR). The decline in ETRs in F. kerguelensis might be explained in terms of different species-specific strategies for tuning the available flux of adenosine triphosphate and nicotinamide adenine dinucleotide phosphate. Overall, our results revealed that P. antarctica was more tolerant to OA and changes in irradiance than the two diatoms, which may have important implications for biogeochemical cycling.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Antarctic; Aragonite saturation state; Bicarbonate ion; 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, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chaetoceros debilis; Chromista; Electron transport rate; Electron transport rate, standard deviation; Fragilariopsis kerguelensis; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Haptophyta; Irradiance; Laboratory experiment; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Non photochemical quenching; Non photochemical quenching, standard deviation; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Open ocean; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phaeocystis antarctica; Phytoplankton; Polar; Primary production/Photosynthesis; Registration number of species; Salinity; Single species; Species; Temperature, water; Treatment; Type; Uniform resource locator/link to reference; Yield; Yield, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 7396 data points
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    DATA PANGAEA
  • 9
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    Seawater carbonate chemistry and productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula (2019)
    PANGAEA
    In:  Supplement to: Heiden, Jasmin; Völkner, Christian; Jones, Elizabeth M; van De Poll, Willem H; Buma, Anita G J; Meredith, Michael P; de Baar, Hein J W; Bischof, Kai; Wolf-Gladrow, Dieter A; Trimborn, Scarlett (2019): Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula. Limnology and Oceanography, 64(4), 1716-1736, https://doi.org/10.1002/lno.11147
    Details
    Publication Date: 2024-03-18
    Description: The Western Antarctic Peninsula (WAP), one of the most productive regions of the Southern Ocean, is currently undergoing rapid environmental changes such as ocean acidification (OA) and increased daily irradiances from enhanced surface‐water stratification. To assess the potential for future biological CO2 sequestration of this region, we incubated a natural phytoplankton assemblage from Ryder Bay, WAP, under a range of pCO2 levels (180 μatm, 450 μatm, and 1000 μatm) combined with either moderate or high natural solar radiation (MSR: 124 μmol photons/m**2/s and HSR: 435 μmol photons/ m**2/s, respectively). The initial and final phytoplankton communities were numerically dominated by the prymnesiophyte Phaeocystis antarctica, with the single cells initially being predominant and solitary and colonial cells reaching similar high abundances by the end. Only when communities were grown under ambient pCO2 in conjunction with HSR did the small diatom Fragilariopsis pseudonana outcompete P. antarctica at the end of the experiment. Such positive light‐dependent growth response of the diatom was, however, dampened by OA. These changes in community composition were caused by an enhanced photosensitivity of diatoms, especially F. pseudonana, under OA and HSR, reducing thereby their competitiveness toward P. antarctica. Moreover, community primary production (PP) of all treatments yielded similar high rates at the start and the end of the experiment, but with the main contributors shifting from initially large to small cells toward the end. Even though community PP of Ryder Bay phytoplankton was insensitive to the changes in light and CO2 availability, the observed size‐dependent shift in productivity could, however, weaken the biological CO2 sequestration potential of this region in the future.
    Keywords: (Diadinoxanthin + Diatoxanthin)/chlorophyll a ratio; (Diadinoxanthin + Diatoxanthin)/chlorophyll a ratio, standard deviation; Abundance; Alkalinity, total; Alkalinity, total, standard deviation; Antarctic; 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/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Cell density, standard deviation; Chlorophyll a/particulate organic carbon ratio; Chlorophyll a/particulate organic carbon ratio, standard deviation; Community composition and diversity; Entire community; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Laboratory experiment; Light; Net primary production of carbon per particulate organic carbon; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; 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 carbon production; Pelagos; pH; pH, standard deviation; Phosphate; Polar; Primary production/Photosynthesis; Primary production of carbon, standard deviation; Rothera_OA; Salinity; Silicate; Silicate, standard deviation; Species; Temperature, water; Thymidine uptake rate, standard deviation; Time point, descriptive; Treatment; Type
    Type: Dataset
    Format: text/tab-separated-values, 3185 data points
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    DATA PANGAEA
  • 10
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    Seawater carbonate chemistry and Southern Ocean phytoplankton community characterization and iron uptake (2017)
    PANGAEA
    In:  Supplement to: Trimborn, Scarlett; Brenneis, Tina; Hoppe, Clara Jule Marie; Laglera, Luis Miguel; Norman, Louiza; Santos-Echeandía, Juan; Völkner, Christian; Wolf-Gladrow, Dieter A; Hassler, Christel S (2017): Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification. Marine Ecology Progress Series, 578, 35-50, https://doi.org/10.3354/meps12250
    Details
    Publication Date: 2024-03-15
    Description: The rise in anthropogenic CO2 and the associated ocean acidification (OA) will change trace metal solubility and speciation, potentially altering Southern Ocean (SO) phytoplankton productivity and species composition. As iron (Fe) sources are important determinants of Fe bioavailability, we assessed the effect of Fe-laden dust versus inorganic Fe (FeCl3) enrichment under ambient and high pCO2 levels (390 and 900 μatm) in a naturally Fe-limited SO phytoplankton community. Despite similar Fe chemical speciation and net particulate organic carbon (POC) production rates, CO2-dependent species shifts were controlled by Fe sources. Final phytoplankton communities of both control and dust treatments were dominated by the same species, with an OA-dependent shift from the diatom Pseudo nitzschia prolongatoides towards the prymnesiophyte Phaeocystis antarctica. Addition of FeCl3 resulted in high abundances of Nitzschia lecointei and Chaetoceros neogracilis under ambient and high pCO2, respectively. These findings reveal that both the characterization of the phytoplankton community at the species level and the use of natural Fe sources are essential for a realistic projection of the biological carbon pump in the Fe-limited pelagic SO under OA. As dust deposition represents a more realistic scenario for the Fe-limited pelagic SO under OA, unaffected net POC production and dominance of P. antarctica can potentially weaken the export of carbon and silica in the future.
    Keywords: Abundance; Abundance, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Antarctic; Aragonite saturation state; Bicarbonate ion; Biogenic particulate silica/Carbon, organic, particulate; Biogenic particulate silica/Carbon, organic, particulate, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, organic, particulate, net production; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Cell density, standard deviation; Community composition and diversity; Entire community; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth rate; Growth rate, standard deviation; Iron, chemically labile; Iron, dissolved; Iron, dissolved, inorganic; Iron, dissolved, standard deviation; Iron, inorganic, conditional stability constants; Iron, inorganic, conditional stability constants, standard deviation; Iron uptake/Carbon, organic, particulate; Iron uptake/Carbon, organic, particulate, standard deviation; Laboratory experiment; Ligand concentration; Ligand concentration, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Micro-nutrients; Nitrate; Nitrate, standard deviation; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Other metabolic rates; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon per cell; Pelagos; pH; pH, standard deviation; Polar; Polar_front; Primary production/Photosynthesis; Salinity; Side coefficient of dissolved Fe-complex ligands; Temperature, water; Time in days; Time point, descriptive; Treatment; Type
    Type: Dataset
    Format: text/tab-separated-values, 4906 data points
    Location Call Number Limitation Availability
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