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  • 2020-2024  (25)
  • 2020-2023  (1)
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  • 1
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    Variations of Fucus vesiculosus photophysiological performance in the Kiel Outdoor Benthocosms in four different seasons – relative electron transport rate and maximum quantum yield (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-13
    Description: Ocean warming and acidification may substantially affect the photophysiological performance of keystone species such as Fucus vesiculosus (Phaeophyceae) in shallow coastal waters. In four consecutive benthic mesocosm experiments (Kiel Outdoor Benthocosm, Kiel, Germany, 54°20'N; 10°09'E), we compared the photophysiological performance (i.e., oxygen production, in vivo chlorophyll a fluorescence, energy dissipation pathways and chlorophyll concentration) of Baltic Sea Fucus under the single and combined impact of elevated seawater temperature (Δ + 5°C) and pCO2 (1100 ppm). Fucus specimens were sampled, in each season (spring: April 2, 2013; summer: July 2, 2013; autumn: 8 October; winter: January 14, 2014) from a depth of 0.2–1 m in the Kiel Fjord (Bülk), western Baltic Sea, Germany (54°27'N; 10°11,5'E). Photosynthetic performance was measured with two different methods, one based on in vivo chlorophyll a fluorescence measurements of photosystem II (PSII), the other one based on oxygen production. For each experiment and treatment, three Fucus specimens 15–25 cm long with 91 ± 30 total apices and apparently equal vigor were chosen, each individually growing on a stone (10–15 cm in diameter) from a single holdfast. For details see material and methods in Graiff et al. 2021. Photosynthesis was highest in spring/early summer when water temperature and solar irradiance increases naturally, and was lowest in winter (December to January/February). Temperature had a stronger effect than pCO2 on photosynthetic performance of Fucus in all seasons. Photophysiological responses were generally positive during the cooler spring months, but strongly negatively affected during summer (due to a marine heat-wave). Especially, future summer temperatures exceeded the thermal tolerance threshold of western Baltic Sea Fucus and had a deleterious impact overall. Potential benefits of the combination of future ocean warming and increased pCO2 over most of the year for Fucus photophysiological performance are suggested by our study, but not during summer peak temperatures.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; chlorophyll fluorescence; DATE/TIME; Fjord; Kiel Fjord; Maximal electron transport rate, relative; mesocosm; Photochemical quantum yield; Photosynthesis; Season; Time in days
    Type: Dataset
    Format: text/tab-separated-values, 146 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Seasonal variations of Fucus vesiculosus photophysiological performance (Kiel Outdoor Benthocosms) (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-13
    Description: Shallow coastal marine ecosystems are exposed to intensive warming events in the last decade, threatening keystone macroalgal species such as the bladder wrack (Fucus vesiculosus, Phaeophyceae) in the Baltic Sea. Herein, we experimentally tested in four consecutive benthic mesocosm experiments, if the single and combined impact of elevated seawater temperature (? + 5◦C) and pCO2 (1100 ppm) under natural irradiance conditions seasonally affected the photophysiological performance (i.e., oxygen production, in vivo chlorophyll a fluorescence, energy dissipation pathways and chlorophyll concentration) of Baltic Sea Fucus. Photosynthesis was highest in spring/early summer when water temperature and solar irradiance increases naturally, and was lowest in winter (December to January/February). Temperature had a stronger effect than pCO2 on photosynthetic performance of Fucus in all seasons. In contrast to the expectation that warmer winter conditions might be beneficial, elevated temperature conditions and sub-optimal low winter light conditions decreased photophysiological performance of Fucus. In summer, western Baltic Sea Fucus already lives close to its upper thermal tolerance limit and future warming of the Baltic Sea during summer may probably become deleterious for this species. However, our results indicate that over most of the year a combination of future ocean warming and increased pCO2 will have slightly positive effects for Fucus photophysiological performance.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification; chlorophyll fluorescence; mesocosm; Photosynthesis
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 3
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    Seasonal photophysiological responses of Fucus vesiculosus in the Kiel Outdoor Benthocosms – PI-curve parameters, non-photochemical quenching, maximum quantum yield, gross oxygen production and chlorophyll concentrations (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-13
    Description: Ocean warming and acidification may substantially affect the photophysiological performance of keystone species such as Fucus vesiculosus (Phaeophyceae) in shallow coastal waters. In four consecutive benthic mesocosm experiments (Kiel Outdoor Benthocosm, Kiel, Germany, 54°20'N; 10°09'E), we compared the photophysiological performance (i.e., oxygen production, in vivo chlorophyll a fluorescence, energy dissipation pathways and chlorophyll concentration) of Baltic Sea Fucus under the single and combined impact of elevated seawater temperature (Δ + 5°C) and pCO2 (1100 ppm). Fucus specimens were sampled, in each season (spring: April 2, 2013; summer: July 2, 2013; autumn: 8 October; winter: January 14, 2014) from a depth of 0.2–1 m in the Kiel Fjord (Bülk), western Baltic Sea, Germany (54°27'N; 10°11,5'E). Photosynthetic performance was measured with two different methods, one based on in vivo chlorophyll a fluorescence measurements of photosystem II (PSII), the other one based on oxygen production. For each experiment and treatment, three Fucus specimens 15–25 cm long with 91 ± 30 total apices and apparently equal vigor were chosen, each individually growing on a stone (10–15 cm in diameter) from a single holdfast. For details see material and methods in Graiff et al. 2021. Photosynthesis was highest in spring/early summer when water temperature and solar irradiance increases naturally, and was lowest in winter (December to January/February). Temperature had a stronger effect than pCO2 on photosynthetic performance of Fucus in all seasons. Photophysiological responses were generally positive during the cooler spring months, but strongly negatively affected during summer (due to a marine heat-wave). Especially, future summer temperatures exceeded the thermal tolerance threshold of western Baltic Sea Fucus and had a deleterious impact overall. Potential benefits of the combination of future ocean warming and increased pCO2 over most of the year for Fucus photophysiological performance are suggested by our study, but not during summer peak temperatures.
    Keywords: Benthocosm_A1; Benthocosm_A2; Benthocosm_B1; Benthocosm_B2; Benthocosm_C1; Benthocosm_C2; Benthocosm_D1; Benthocosm_D2; Benthocosm_E1; Benthocosm_E2; Benthocosm_F1; Benthocosm_F2; BIOACID; Biological Impacts of Ocean Acidification; Chlorophyll a; Chlorophyll c2; chlorophyll fluorescence; Comment; Date; Electron transport rate efficiency; Event label; Experiment; Experimental treatment; Gross primary production of oxygen; Kiel Fjord; Light saturation point; Maximal electron transport rate, relative; MESO; mesocosm; Mesocosm experiment; Non photochemical quenching, maximum; Photochemical quantum yield; Photosynthesis; Sample code/label; Season
    Type: Dataset
    Format: text/tab-separated-values, 1446 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Morphological determination of the phototrophic community composition of biological soil crusts in coastal sand dunes in northern Germany (2022)
    PANGAEA
    Details
    Publication Date: 2024-01-24
    Description: This dataset comprises the microbial community composition of biological soil crusts in north-German sand dunes. For this we obtained enrichment cultures of phototrophic microorganisms, by placing fragments of biocrusts of the same Petri dishes as used for sequencing, in Petri dishes with Bold Basal (1N BBM) agarized medium (Bischoff and Bold 1963). Cultures were grown under standard laboratory conditions: with a 12-hour alteration of light and dark phases and irradiation of 25 μmol photons m-2 s-1 at a temperature 20 ± 5 ºС. Microscopic study of these raw cultures began in the third week of cultivation. Morphological examinations were performed using Olympus BX53 light microscope with Nomarski DIC optics (Olympus Ltd, Hamburg, Germany). Micrographs were taken with a digital camera (Olympus LC30) attached to the microscope, and processed by the Olympus software cellSens Entry. Direct microscopy of rewetted samples was performed in parallel with cultivation for evaluation of dominating species of algae and cyanobacteria in the original samples. Morphological identification of the biocrust organisms was based mainly on Ettl and Gärtner (2014) for green microalgae, and on Komárek (2013) for cyanobacteria, as well as on some monographs and papers devoted to taxonomic revisions of the taxa of interest (Darienko and Pröschold 2019). Moss and lichens samples were air-dried after collection. For determination, a microscope with a maximum magnification of 400x was used. Morphological identification of mosses followed Frahm and Frey (2004) with taxonomical reference to (Hodgetts et al. 2020). Lichens were determined according to Wirth et al. (2013). Morphologically critical species of the genus Cladonia where additionally analyzed by thin-layer chromatography according to (Culberson and Ammann 1979) in solvent system A.
    Keywords: 16S rRNA; Actinochloris terrestris; algae; Amandinea punctata; Asterococcus sp.; Bacidina etayana; Brachythecium albicans; Bracteacoccus sp.; Bryum capillare; Caloplaca cerinella; Campylopus introflexus; Cephaloziella divaricata; Ceratodon purpureus; Chlorella vulgaris; Chlorococcum sp.; Chloroidium cf. ellipsoideum; Chlorokybus atmophyticus; Chlorolobion sp.; Cladonia arbuscula; Cladonia chlorophaea; Cladonia ciliata; Cladonia coccifera; Cladonia conista; Cladonia fimbriata; Cladonia floerkeana; Cladonia foliacea; Cladonia furcata; Cladonia glauca; Cladonia gracilis; Cladonia humilis; Cladonia macilenta; Cladonia novochlorophaea; Cladonia phyllophora; Cladonia portentosa; Cladonia ramulosa; Cladonia rangiformis; Cladonia rei; Cladonia scabriuscula; Cladonia subulata; Cladonia uncialis ssp. biuncialis; Coccomyxa sp.; Coelastrella sp.; Crusts; Cylindrocystis cf. crassa; Cylindrocystis sp.; Darßer Ort, Mecklenburg Western Pomerania, Germany; DATE/TIME; Dicranum scoparium; Diplosphaera chodatii; DOBD; DOeGD; DOlGD; DOWD; dune; Elevation of event; Elliptochloris subsphaerica; Eremochloris sp.; Event label; Evernia prunastri; Field experiment; Hennediella heimii; Hypnum cupressiforme; Hypnum cupressiforme var. lacunosum; Hypnum jutlandicum; Hypogymnia physodes; Interfilum cf. massjukiae; Interfilum terricola; Klebsormidium cf. flaccidum; Klebsormidium cf. subtile; Klebsormidium crenulatum; Latitude of event; Lecania cyrtella; Lecanora hagenii; Lecanora persimilis; Leptolyngbya sp.; Light microscope; Light microscope, Olympus Ltd, BX53, with Nomarski DIC optics; Lobochlamys sp.; Location; Longitude of event; Lophozia bicuspidata; Macrochloris sp.; Micarea misella; Microcoleus vaginatus; Myrmecia cf. irregularis; Nannochloris sp.; Nodosilinea cf. epilithica; Nostoc cf. commune; Nostoc cf. edaphicum; Nostoc cf. linckia; Nostoc sp.; Oxyrrhynchium praelongum; Parietochloris cf. alveolaris; Parmelia sulcata; Peltigera extenuata; Peltigera hymenia; Physcia tenella; Placynthiella uliginosa; Planophila sp.; Pleurozium schreberi; POBD; POGD; Pohlia nutans; Polytrichum juniperinum; Polytrichum piliferum; POWD; POWW; Pramort, Mecklenburg Western Pomerania, Germany; PreDCI; PreIS; Prerow, Mecklenburg Western Pomerania, Germany; ProGD; ProH; Pseudochlorella sp.; Pseudomuriella cf. aurantiaca; Pseudoscleropodium purum; Ptilidium ciliatum; Ptychostomum capillare; Ptychostomum compactum; Ptychostomum imbricatulum; Ptychostomum moravicum; Racomitrium canescens; Racomitrium elongatum; Rügen, Mecklenburg Western Pomerania, Germany; SchBD; SchGD; SchPD; SchWD; Scoliciosporum gallurae; sediment analysis; Site; soil ecology; Spongiochloris sp.; Stenomitos sp.; Stichococcus allas; Stichococcus cf. bacillaris; Syntrichia ruraliformis; Tetracystis cf. sarcinalis; Tetradesmus arenicola; Thin layer chromatography; Timaviella sp.; Tolypothrix cf. byssoidea; VerctF; Verden (Aller), Lower Saxony, Germany; VerTsZ; Watanabea cf. acidophila; Xanthoria parietina
    Type: Dataset
    Format: text/tab-separated-values, 1962 data points
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  • 5
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    Seawater carbonate chemistry and PI-curve parameters, non-photochemical quenching, maximum quantum yield, gross oxygen production and chlorophyll concentrations of Fucus vesiculosus in the Kiel Outdoor Benthocosms (2021)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Shallow coastal marine ecosystems are exposed to intensive warming events in the last decade, threatening keystone macroalgal species such as the bladder wrack (Fucus vesiculosus, Phaeophyceae) in the Baltic Sea. Herein, we experimentally tested in four consecutive benthic mesocosm experiments, if the single and combined impact of elevated seawater temperature (+ 5◦C) and pCO2 (1100 ppm) under natural irradiance conditions seasonally affected the photophysiological performance (i.e., oxygen production, in vivo chlorophyll a fluorescence, energy dissipation pathways and chlorophyll concentration) of Baltic Sea Fucus. Photosynthesis was highest in spring/early summer when water temperature and solar irradiance increases naturally, and was lowest in winter (December to January/February). Temperature had a stronger effect than pCO2 on photosynthetic performance of Fucus in all seasons. In contrast to the expectation that warmer winter conditions might be beneficial, elevated temperature conditions and sub-optimal low winter light conditions decreased photophysiological performance of Fucus. In summer, western Baltic Sea Fucus already lives close to its upper thermal tolerance limit and future warming of the Baltic Sea during summer may probably become deleterious for this species. However, our results indicate that over most of the year a combination of future ocean warming and increased pCO2 will have slightly positive effects for Fucus photophysiological performance.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Benthocosm_A1; Benthocosm_A2; Benthocosm_B1; Benthocosm_B2; Benthocosm_C1; Benthocosm_C2; Benthocosm_D1; Benthocosm_D2; Benthocosm_E1; Benthocosm_E2; Benthocosm_F1; Benthocosm_F2; Benthos; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Chlorophyll c2; Chromista; Coast and continental shelf; Comment; DATE/TIME; Electron transport rate efficiency; Event label; Experiment; Fucus vesiculosus; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross primary production of oxygen; Kiel Fjord; Laboratory experiment; Light saturation point; Macroalgae; Maximal electron transport rate, relative; MESO; Mesocosm experiment; Mesocosm or benthocosm; Non photochemical quenching, maximum; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Photochemical quantum yield; Primary production/Photosynthesis; Registration number of species; Salinity; Salinity, standard deviation; Sample code/label; Season; Single species; Species; Temperate; Temperature; Temperature, water; Temperature, water, standard deviation; Time in days; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 3836 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Seawater carbonate chemistry and seasonal variations of Fucus vesiculosus fertility in the western Baltic Sea (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Ocean warming and acidification may substantially affect the reproduction of keystone species such as Fucus vesiculosus (Phaeophyceae). In four consecutive benthic mesocosm experiments, we compared the reproductive biology and quantified the temporal development of Baltic Sea Fucus fertility under the single and combined impact of elevated seawater temperature and pCO2 (1100 ppm). In an additional experiment, we investigated the impact of temperature (0–25°C) on the maturation of North Sea F. vesiculosus receptacles. A marked seasonal reproductive cycle of F. vesiculosus became apparent in the course of 1 year. The first appearance of receptacles on vegetative apices and the further development of immature receptacles of F. vesiculosus in autumn were unaffected by warming or elevated pCO2. During winter, elevated pCO2 in both ambient and warmed temperatures increased the proportion of mature receptacles significantly. In spring, warming and, to a lesser extent, elevated pCO2 accelerated the maturation of receptacles and advanced the release of gametes by up to 2 weeks. Likewise, in the laboratory, maturation and gamete release were accelerated at 15–25°C relative to colder temperatures. In summary, elevated pCO2 and/or warming do not influence receptacle appearance in autumn, but do accelerate the maturation process during spring, resulting in earlier gamete release. Temperature and, to a much lesser extent, pCO2 affect the temporal development of Fucus fertility. Thus, rising temperatures will mainly shift or disturb the phenology of F. vesiculosus in spring and summer, which may alter and/or hamper its ecological functions in shallow coastal ecosystems of the Baltic Sea.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Benthocosm_A1; Benthocosm_A2; Benthocosm_B1; Benthocosm_B2; Benthocosm_C1; Benthocosm_C2; Benthocosm_D1; Benthocosm_D2; Benthocosm_E1; Benthocosm_E2; Benthocosm_F1; Benthocosm_F2; Benthos; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Coast and continental shelf; Counts; DATE/TIME; Event label; Experiment; Fucus vesiculosus; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Kiel Fjord; Laboratory experiment; Macroalgae; Maturation stage; MESO; Mesocosm experiment; Mesocosm or benthocosm; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Proportion; Reproduction; Reproductive allocation ratio; Salinity; Salinity, standard deviation; Sample code/label; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Temperate; Temperature; Temperature, water; Temperature, water, standard deviation; Treatment; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 8430 data points
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    DATA PANGAEA
  • 7
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    Seawater carbonate chemistry and seasonal mesocosm community experiments with warming and acidification treatments in Kiel Outdoor Benthocosms (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: The plea for using more “realistic,” community‐level, investigations to assess the ecological impacts of global change has recently intensified. Such experiments are typically more complex, longer, more expensive, and harder to interpret than simple organism‐level benchtop experiments. Are they worth the extra effort? Using outdoor mesocosms, we investigated the effects of ocean warming (OW) and acidification (OA), their combination (OAW), and their natural fluctuations on coastal communities of the western Baltic Sea during all four seasons. These communities are dominated by the perennial and canopy‐forming macrophyte Fucus vesiculosus—an important ecosystem engineer Baltic‐wide. We, additionally, assessed the direct response of organisms to temperature and pH in benchtop experiments, and examined how well organism‐level responses can predict community‐level responses to the dominant driver, OW. OW affected the mesocosm communities substantially stronger than acidification. OW provoked structural and functional shifts in the community that differed in strength and direction among seasons. The organism‐level response to OW matched well the community‐level response of a given species only under warm and cold thermal stress, that is, in summer and winter. In other seasons, shifts in biotic interactions masked the direct OW effects. The combination of direct OW effects and OW‐driven shifts of biotic interactions is likely to jeopardize the future of the habitat‐forming macroalga F. vesiculosus in the Baltic Sea. Furthermore, we conclude that seasonal mesocosm experiments are essential for our understanding of global change impact because they take into account the important fluctuations of abiotic and biotic pressures.
    Keywords: Abundance change; Alkalinity, total; Aragonite saturation state; Asterias rubens; Asterias rubens, survival; Balanus improvisus; Balanus improvisus, plate, growth rate; Benthos; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Community composition and diversity; Entire community; Experiment; Fucus vesiculosus; Fucus vesiculosus, length, growth rate; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Laboratory experiment; Mesocosm or benthocosm; Mortality/Survival; Mytilus edulis; Mytilus edulis, shell length, growth rate; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Replicate; Rocky-shore community; Salinity; Season; Temperate; Temperature; Temperature, water; Treatment; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 1200 data points
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    DATA PANGAEA
  • 8
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    Seawater carbonate chemistry and survival and growth of macroalgal Fucus vesiculosus germlings (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Ecological impact of global change is generated by multiple synchronous or asynchronous drivers which interact with each other and with intraspecific variability of sensitivities. In three near-natural experiments, we explored response correlations of full-sibling germling families of the seaweed Fucus vesiculosus towards four global change drivers: elevated CO2 (ocean acidification, OA), ocean warming (OW), combined OA and warming (OAW), nutrient enrichment and hypoxic upwelling. Among families, performance responses to OA and OW as well as to OAW and nutrient enrichment correlated positively whereas performance responses to OAW and hypoxia anti-correlated. This indicates (i) that families robust to one of the three drivers (OA, OW, nutrients) will also not suffer from the two other shifts, and vice versa and (ii) families benefitting from OAW will more easily succumb to hypoxia. Our results may imply that selection under either OA, OW or eutrophication would enhance performance under the other two drivers but simultaneously render the population more susceptible to hypoxia. We conclude that intraspecific response correlations have a high potential to boost or hinder adaptation to multifactorial global change scenarios.
    Keywords: Alkalinity, total; Aragonite saturation state; Benthos; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Coast and continental shelf; Fucus vesiculosus; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Group; Growth/Morphology; Laboratory experiment; Macroalgae; Macro-nutrients; Mesocosm or benthocosm; Mortality/Survival; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Oxygen; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Period; pH; Ratio, standard error; Response ratio, logarithm; Salinity; Single species; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Temperate; Temperature; Temperature, water; Treatment; Type of study; Year of sampling
    Type: Dataset
    Format: text/tab-separated-values, 1172 data points
    Location Call Number Limitation Availability
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  • 9
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    Summer heatwave impacts on the European kelp Saccharina latissima across its latitudinal distribution gradient – raw data to temperature-amplitude experiment with field material from five different locations (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-16
    Description: Temperature is a major factor for the global biogeographic pattern of marine benthic algal species and their loss has serious consequences for ecosystems. Local adaptation and phenotypic plasticity of species can result in intraspecific differences of thermal tolerance, and population loss might not only occur at thermal trailing edges. Understanding the underlying physiological and biochemical response mechanisms is from major importance. Therefore, we run the same short-term experiment with field sporophytes of Saccharina latissima from five locations along the European coast (Spitsbergen, Bodø, Bergen, Helgoland, Locmariaquer). We increased each respective mean summer temperature (control, ±0°C) by +2, +4 and +6°C to mimic realistic local heatwave events. The maximum photosynthetic quantum yield of photosystem II (Fv/Fm; Imaging-PAM, Walz GmbH Mess- und Regeltechnik, Effeltrich, Germany) was monitored every day. For growth, the size of the algal discs was photographed every second day, analyzed with ImageJ (Version 1.52a). Absolute concentrations of all pigments were analyzed using a HPLC. Afterwards, the pool sizes, the de-epoxidation state of the xanthophyll cycle (DPS), and the ratios were calculated. The C:N ratio, total nitrogen and total carbon content were analyzed with an elemental analyzer. Mannitol concentration was also analyzed in a HPLC. Phlorotannins were analyzed using the photometric Folin-Ciocalteu method.
    Keywords: Antheraxanthin; Bergen_MULT; Bodo_MULT; Carbon, total; Carbon/Nitrogen ratio; Chlorophyll a; Chlorophyll c2; Elemental analyzer; Event label; Family; France; Fucoxanthin; growth; heatwave; Helgoland_MULT; Helgoland, North Sea; High Performance Liquid Chromatography (HPLC); ImageJ (Version 1.52a); Imaging-PAM (Walz GmbH Mess- und Regeltechnik, Effeltrich, Germany); kelp; latitude; Latitude of event; Location; Locmariaquer_MULT; Longitude of event; Mannitol; Maximum photochemical quantum yield of photosystem II; MULT; Multiple investigations; Nitrogen, total; Norway; Ny-Alesund_MULT; phlorotannins; Phlorotannins; Photosynthesis; Replicates; Size; Species; Spitsbergen; Treatment: temperature; Treatment: temperature amplitude; Violaxanthin; Zeaxanthin
    Type: Dataset
    Format: text/tab-separated-values, 12312 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Impacts of combined temperature and salinity stress on the endemic Arctic brown seaweed Laminaria solidungula – physiological and biochemical results of laboratory experiments with young sporophytes (2020)
    PANGAEA
    Details
    Publication Date: 2024-05-24
    Description: Macroalgae such as kelp are important ecosystem engineers in the Polar Regions and potentially affected by freshening and ocean warming. The endemic Arctic kelp Laminaria solidungula might be particularly imperiled and become locally extinct from Arctic fjord systems in the future, since temperature increase is most pronounced in the Polar Regions. Additionally, increased temperatures cause glacier and sea ice melting and enhancing terrestrial run-off from snowfields, which eventually can result in hyposaline conditions in fjord systems. We conducted a multiple-stressor experiment at four temperatures (0, 5, 10, 15 °C) and two salinities (SA 25, 35) over 14 days to investigate the combined effects of increasing temperature and decreasing salinities on young L. solidungula sporophytes. The experiment was conducted with laboratory cultures (AWI culture number 3130) at Alfred Wegener Institute - Helmholtz Centre for Polar and Marine Research, Bremerhaven in February 2018. As physiological parameter, the maximum photosynthetic quantum yield of photosystem II (Fv/Fm; Imaging-PAM) was monitored every fourth day with an Imaging-PAM (Walz GmbH Mess- und Regeltechnik, Effeltrich, Germany). The total nitrogen, total carbon content was analyzed with an elemental analyzer and the C:N ratio calculated. Phlorotannins, mannitol as well as absolute pigment concentrations were analyzed using a HPLC and the deepoxydation state of the xanthophyll cycle (DPS) calculated.
    Keywords: beta-Carotene; C:N; Carbon, per dry mass; Carbon/Nitrogen ratio; Chlorophyll a; Chlorophyll c2; De-expoxidation state of xanthophyll cycle; DPS; Family; Fucoxanthin; Fv/Fm; High Performance Liquid Chromatography (HPLC); Imaging-PAM (Walz GmbH Mess- und Regeltechnik, Effeltrich, Germany); kelp; Mannitol; Maximum quantum yield of photosystem II; Multiple-stressor; Nitrogen, per dry mass; Phlorotannins; Replicate; Species; Treatment: salinity; Treatment: temperature; Violaxanthin + Antheraxanthin + Zeaxanthin
    Type: Dataset
    Format: text/tab-separated-values, 2212 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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