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  • 1
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    Total oxygen fluxes, and diatom density, diatom biomass and diversity of the diatom community in spring 2016 and environmental photosynthetically active radiation from 2015 and 2016 from three stations in Potter Cove, Antarctica (2018)
    PANGAEA
    In:  Supplement to: Hoffmann, Ralf; Al-Handal, Adil Yousif; Wulff, Angela; Deregibus, Dolores; Zacher, Katharina; Quartino, Maria Liliana; Wenzhöfer, Frank; Braeckman, Ulrike (2019): Implications of Glacial Melt-Related Processes on the Potential Primary Production of a Microphytobenthic Community in Potter Cove (Antarctica). Frontiers in Marine Science, 6, https://doi.org/10.3389/fmars.2019.00655
    Details
    Publication Date: 2023-02-23
    Description: The Antarctic Peninsula experiences a fast retreat of glaciers, which correlates with an increased release of particles and related increased sedimentation and thus, a decrease in the available light for benthic primary production. We investigated how changes in the general sedimentation and shading patterns affect the primary production by benthic microalgae, the microphytobenthos. In order to determine potential net primary production and respiration of the microphytobenthic community, sediment cores from locations exposed to different sedimentation rates and shading were exposed to photosynthetic active radiation (PAR, 400–700 nm) of 0–70 µmol photons m-2 s-1. Total oxygen fluxes and microphytobenthic diatom community structure, density, and biomass were determined. Our study revealed that the net primary production of the microphytobenthos decreased with increasing sedimentation and shading, while the microphytobenthic diatom density and composition remained similar. By comparing our experimental results with in situ measured PAR intensities, we furthermore assessed the microphytobenthic primary production as an important carbon source within Potter Cove's benthic ecosystem. We propose that the microphytobenthic contribution to the total primary production may drop drastically due to Antarctic glacial retreat and correlated sedimentation and shading, with yet unknown consequences for the benthic heterotrophic community, its structure, and diversity.
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 2
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    Density, biomass and diversity of the diatom community at Faro, Creek and Isla D in Potter Cove (King George Island) in November and December 2016 (2018)
    PANGAEA
    Details
    Publication Date: 2023-07-09
    Keywords: Achnanthes bongrain; Achnanthes bongrain, biomass as carbon; Actinocyclus actinochilus; Actinocyclus actinochilus, biomass as carbon; Amphora gourdonii; Amphora gourdonii, biomass as carbon; Amphora holsatica; Amphora holsatica, biomass as carbon; Amphora marina; Amphora marina, biomass as carbon; Amphora sp.; Amphora sp., biomass as carbon; Asteromphalus parvulus; Asteromphalus parvulus, biomass as carbon; Biremis sp.; Biremis sp., biomass as carbon; Cocconeis costata; Cocconeis costata, biomass as carbon; Cocconeis imperatrix; Cocconeis imperatrix, biomass as carbon; Cocconeis matsii; Cocconeis matsii, biomass as carbon; Cocconeis orbicularis; Cocconeis orbicularis, biomass as carbon; Cocconeis pottercovei; Cocconeis pottercovei, biomass as carbon; Cocconeis schuettii; Cocconeis schuettii, biomass as carbon; Corethron pennatum; Corethron pennatum, biomass as carbon; DATE/TIME; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Diploneis smithii; Diploneis smithii, biomass as carbon; DIVER; Elevation of event; Elevation of event 2; Entomoneis gigantea; Entomoneis gigantea, biomass as carbon; Entomoneis kjellmanii; Entomoneis kjellmanii, biomass as carbon; Entomoneis paludosa; Entomoneis paludosa, biomass as carbon; Entopyla ocellata; Entopyla ocellata, biomass as carbon; Event label; Fragilariopsis cylindrus; Fragilariopsis cylindrus, biomass as carbon; Gyrosigma arcuatum; Gyrosigma arcuatum, biomass as carbon; Gyrosigma fasciola; Gyrosigma fasciola, biomass as carbon; Gyrosigma obscurum; Gyrosigma obscurum, biomass as carbon; Latitude of event; Licmophora antarctica; Licmophora antarctica, biomass as carbon; Licmophora decora; Licmophora decora, biomass as carbon; Longitude of event; Lyrella abrupta; Lyrella abrupta, biomass as carbon; Navicula cancellata; Navicula cancellata, biomass as carbon; Navicula directa; Navicula directa, biomass as carbon; Navicula perminuta; Navicula perminuta, biomass as carbon; Nitzschia angularis; Nitzschia angularis, biomass as carbon; Nitzschia hybrida; Nitzschia hybrida, biomass as carbon; Odontella litigiosa; Odontella litigiosa, biomass as carbon; Parlibellus delognei; Parlibellus delognei, biomass as carbon; Petroneis plagiostoma; Petroneis plagiostoma, biomass as carbon; Petroneis sp.; Petroneis sp., biomass as carbon; Pinnularia quadratarea; Pinnularia quadratarea, biomass as carbon; Pleurosigma strigosum; Pleurosigma strigosum, biomass as carbon; Porosira glacialis; Porosira glacialis, biomass as carbon; PotterCove_Creek_2016-L; PotterCove_Creek_2016-S; PotterCove_Faro_2016-L; PotterCove_Faro_2016-S; PotterCove_Isla_D_2016-L; PotterCove_Isla_D_2016-S; Potter Cove, King George Island, Antarctic Peninsula; Pseudogomphonema kamtschaticum; Pseudogomphonema kamtschaticum, biomass as carbon; Replicate; Rhabdonema arcuatum; Rhabdonema arcuatum, biomass as carbon; Sampling by diver; Shannon Diversity Index; Site; Surirella sp.; Surirella sp., biomass as carbon; Synedropsis fragilis; Synedropsis fragilis, biomass as carbon; Thalassiosira gravida; Thalassiosira gravida, biomass as carbon; Thalassiosira maculata; Thalassiosira maculata, biomass as carbon; Thalassiosira sp.; Thalassiosira sp., biomass as carbon; Thalassiosira tumida; Thalassiosira tumida, biomass as carbon; Trachyneis aspera; Trachyneis aspera, biomass as carbon
    Type: Dataset
    Format: text/tab-separated-values, 1212 data points
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  • 3
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    Impact of temperature and species interaction on filamentous cyanobacteria may be more important than salinity and increased pCO2 levels (2013)
    PANGAEA
    In:  Supplement to: Karlberg, Maria; Wulff, Angela (2012): Impact of temperature and species interaction on filamentous cyanobacteria may be more important than salinity and increased pCO2 levels. Marine Biology, 160(8), 2063-2072, https://doi.org/10.1007/s00227-012-2078-3
    Details
    Publication Date: 2023-07-07
    Description: A future business-as-usual scenario (A1FI) was tested on two bloom-forming cyanobacteria of the Baltic Proper, Nodularia spumigena and Aphanizomenon sp., growing separately and together. The projected scenario was tested in two laboratory experiments where (a) interactive effects of increased temperature and decreased salinity and (b) interactive effects of increased temperature and elevated levels of pCO2 were tested. Increased temperature, from 12 to 16 °C, had a positive effect on the biovolume and photosynthetic activity (F v/F m) of both species. Compared when growing separately, the biovolume of each species was lower when grown together. Decreased salinity, from 7 to 4, and elevated levels of pCO2, from 380 to 960 ppm, had no effect on the biovolume, but on F v/F m of N. spumigena with higher F v/F m in salinity 7. Our results suggest that the projected A1FI scenario might be beneficial for the two species dominating the extensive summer blooms in the Baltic Proper. However, our results further stress the importance of studying interactions between species.
    Keywords: Alkalinity, total; Aphanizomenon sp.; Bacteria; Baltic Sea; Bicarbonate ion; Biovolume; Bottles or small containers/Aquaria (〈20 L); Calculated using CO2SYS; Carbonate ion; Carbon dioxide; Cyanobacteria; Growth/Morphology; Laboratory experiment; Laboratory strains; Maximum photochemical quantum yield of photosystem II; Nodularia spumigena; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phytoplankton; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Salinity; Single species; Temperature; Temperature, water; Time point, descriptive; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 1930 data points
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  • 4
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    Potter Cove climatology, meteorology, oceanography and benthic biogeochemistry and community measurements from 2015-2016 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-17
    Description: During 4 expeditions to Potter Cove, King George Island, Antarctica (Carlini base: February-March 2015, September 2015, December 2015 and December 2016), benthic chambers were deployed in situ at three locations with differing glacial melt impact (Faro, Isla D, Creek) to measure total oxygen exchange at the sediment-water interface. Dark chambers measured community respiration, while light chambers measured net community metabolism. Sediment parameters were measured in the top 5 cm at the same location as the benthic chambers (sediment physico-chemical parameters, as well as prokyarotic and meiobenthic density and biomass; density and biomass of macrobenthos and of the large burrowing bivalve Laternula elliptica were measured separately). A detailed record of climatology, meteorology and oceanography of Potter Cove over the entire period spanning between the first (February 2015) and last (December 2016) benthic chamber deployment is also provided.
    Keywords: Antarctic; Benthos; biogeochemistry; El Niño; glacial melt; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; la Niña; Microphytobenthos; Oxygen; seasonal; sediments
    Type: Dataset
    Format: application/zip, 15 datasets
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  • 5
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    Long-term acclimation to elevated pCO2 alters carbon metabolism and reduces growth in the Antarctic diatom Nitzschia lecointei (2015)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Increasing atmospheric CO2 levels are driving changes in the seawater carbonate system, resulting in higher pCO2 and reduced pH (ocean acidification). Many studies on marine organisms have focused on short-term physiological responses to increased pCO2, and few on slow-growing polar organisms with a relative low adaptation potential. In order to recognize the consequences of climate change in biological systems, acclimation and adaptation to new environments are crucial to address. In this study, physiological responses to long-term acclimation (194 days, approx. 60 asexual generations) of three pCO2 levels (280, 390 and 960 µatm) were investigated in the psychrophilic sea ice diatom Nitzschia lecointei. After 147 days, a small reduction in growth was detected at 960 µatm pCO2. Previous short-term experiments have failed to detect altered growth in N. lecointei at high pCO2, which illustrates the importance of experimental duration in studies of climate change. In addition, carbon metabolism was significantly affected by the long-term treatments, resulting in higher cellular release of dissolved organic carbon (DOC). In turn, the release of labile organic carbon stimulated bacterial productivity in this system. We conclude that long-term acclimation to ocean acidification is important for N. lecointei and that carbon overconsumption and DOC exudation may increase in a high-CO2 world.
    Keywords: Alkalinity, total; Antarctic; Aragonite saturation state; Bacteria; Bacterial production of carbon; Bacterial production of carbon per cell; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Chromista; Comment; Dry mass per cell; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Generation; Growth/Morphology; Growth rate; Identification; Laboratory experiment; Laboratory strains; Nitzschia lecointei; Number; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; Percentage; pH; Phytoplankton; Potentiometric titration; Primary production/Photosynthesis; Primary production of carbon; Primary production of carbon per cell; Registration number of species; Salinity; Sample ID; Single species; Species; Spectrophotometric; Temperature, water; Time in days; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 18416 data points
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  • 6
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    Seawater carbonate chemistry and Microalgal photophysiology and macronutrient distribution in summer sea ice in the Amundsen and Ross Seas, Antarctica (2018)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Our study addresses how environmental variables, such as macronutrients concentrations, snow cover, carbonate chemistry and salinity affect the photophysiology and biomass of Antarctic sea-ice algae. We have measured vertical profiles of inorganic macronutrients (phosphate, nitrite + nitrate and silicic acid) in summer sea ice and photophysiology of ice algal assemblages in the poorly studied Amundsen and Ross Seas sectors of the Southern Ocean. Brine-scaled bacterial abundance, chl a and macronutrient concentrations were often high in the ice and positively correlated with each other. Analysis of photosystem II rapid light curves showed that microalgal cells in samples with high phosphate and nitrite + nitrate concentrations had reduced maximum relative electron transport rate and photosynthetic efficiency. We also observed strong couplings of PSII parameters to snow depth, ice thickness and brine salinity, which highlights a wide range of photoacclimation in Antarctic pack-ice algae. It is likely that the pack ice was in a post-bloom situation during the late sea-ice season, with low photosynthetic efficiency and a high degree of nutrient accumulation occurring in the ice. In order to predict how key biogeochemical processes are affected by future changes in sea ice cover, such as in situ photosynthesis and nutrient cycling, we need to understand how physicochemical properties of sea ice affect the microbial community. Our results support existing hypothesis about sea-ice algal photophysiology, and provide additional observations on high nutrient concentrations in sea ice that could influence the planktonic communities as the ice is retreating.
    Keywords: Alkalinity, total; Antarctic; Aragonite saturation state; Bacteria; Bicarbonate ion; Biomass/Abundance/Elemental composition; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Coast and continental shelf; Core; DEPTH, ice/snow; Electron transport rate efficiency; Entire community; Field observation; Fucoxanthin; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Ice thickness; Identification; Irradiance; LATITUDE; Light saturation; LONGITUDE; Maximal electron transport rate, relative; Maximum photochemical quantum yield of photosystem II; Nitrate and Nitrite; Non photochemical quenching; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phosphate; Polar; Primary production/Photosynthesis; Salinity; Section; Silicate; Station label; Temperature, water; Type
    Type: Dataset
    Format: text/tab-separated-values, 3286 data points
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  • 7
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    Laternula elliptica biomasses at three stations in Potter Cove (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-17
    Keywords: Antarctic; Benthic Chamber; Benthos; biogeochemistry; CHAM; El Niño; Event label; glacial melt; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; la Niña; Laternula elliptica; Laternula elliptica, mass carbon per area; Laternula elliptica, mass carbon per individual; Microphytobenthos; Oxygen; PotterCove_Creek_spring2015; PotterCove_Creek_spring2016; PotterCove_Creek_summer2015; PotterCove_Faro_spring2015; PotterCove_Faro_spring2016; PotterCove_Faro_summer2015; PotterCove_Isla_D_spring2015; PotterCove_Isla_D_spring2016; PotterCove_Isla_D_summer2015; Potter Cove, King George Island, Antarctic Peninsula; Season; seasonal; sediments; Station label
    Type: Dataset
    Format: text/tab-separated-values, 682 data points
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  • 8
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    Environmental photosynthetically active radiation (PAR) at Creek, Potte rCove in 2016 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-17
    Keywords: DATE/TIME; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; OBSE; Observation; PotterCove_Creek_2016-series; Potter Cove, King George Island, Antarctic Peninsula; Radiation, photosynthetically active
    Type: Dataset
    Format: text/tab-separated-values, 1826 data points
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  • 9
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    Environmental photosynthetically active radiation (PAR) at Faro, Potter Cove in 2015 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-17
    Keywords: DATE/TIME; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; OBSE; Observation; PotterCove_Faro_2015_series; Potter Cove, King George Island, Antarctic Peninsula; Radiation, photosynthetically active
    Type: Dataset
    Format: text/tab-separated-values, 14037 data points
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  • 10
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    Environmental photosynthetically active radiation (PAR) at Faro, Potter Cove 2016 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-17
    Keywords: DATE/TIME; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; OBSE; Observation; PotterCove_Faro_2016_series; Potter Cove, King George Island, Antarctic Peninsula; Radiation, photosynthetically active
    Type: Dataset
    Format: text/tab-separated-values, 5200 data points
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