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  • Oxford University Press  (428,980)
  • PANGAEA  (422,718)
  • American Association for the Advancement of Science  (369,592)
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  • 1
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    Pollen analyses of sediment core GeoB9508-5 (2012)
    PANGAEA
    In:  Supplement to: Bouimetarhan, Ilham; Prange, Matthias; Schefuß, Enno; Dupont, Lydie M; Lippold, Jörg; Mulitza, Stefan; Zonneveld, Karin A F (2012): Sahel megadrought during Heinrich Stadial 1: evidence for a three-phase evolution of the low- and mid-level West African wind system. Quaternary Science Reviews, 58, 66-76, https://doi.org/10.1016/j.quascirev.2012.10.015
    Details
    Publication Date: 2024-05-27
    Description: Millennial-scale dry events in the Northern Hemisphere monsoon regions during the last Glacial period are commonly attributed to southward shifts of the Intertropical Convergence Zone (ITCZ) associated with an intensification of the northeasterly (NE) trade wind system during intervals of reduced Atlantic meridional overturning circulation (AMOC). Through the use of high-resolution last deglaciation pollen records from the continental slope off Senegal, our data show that one of the longest and most extreme droughts in the western Sahel history, which occurred during the North Atlantic Heinrich Stadial 1 (HS1), displayed a succession of three major phases. These phases progressed from an interval of maximum pollen representation of Saharan elements between ~19 and 17.4 kyr BP indicating the onset of aridity and intensified NE trade winds, followed by a millennial interlude of reduced input of Saharan pollen and increased input of Sahelian pollen, to a final phase between ~16.2 and 15 kyr BP that was characterized by a second maximum of Saharan pollen abundances. This change in the pollen assemblage indicates a mid-HS1 interlude of NE trade wind relaxation, occurring between two distinct trade wind maxima, along with an intensified mid-tropospheric African Easterly Jet (AEJ) indicating a substantial change in West African atmospheric processes. The pollen data thus suggest that although the NE trades have weakened, the Sahel drought remained severe during this time interval. Therefore, a simple strengthening of trade winds and a southward shift of the West African monsoon trough alone cannot fully explain millennial-scale Sahel droughts during periods of AMOC weakening. Instead, we suggest that an intensification of the AEJ is needed to explain the persistence of the drought during HS1. Simulations with the Community Climate System Model indicate that an intensified AEJ during periods of reduced AMOC affected the North African climate by enhancing moisture divergence over the West African realm, thereby extending the Sahel drought for about 4000 years.
    Keywords: 293; Center for Marine Environmental Sciences; GeoB9508-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL
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  • 2
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    Dinoflagellate cysts and pollen distribution of marine surface sediments off West Africa (2009)
    PANGAEA
    In:  Supplement to: Bouimetarhan, Ilham; Marret, Fabienne; Dupont, Lydie M; Zonneveld, Karin A F (2009): Dinoflagellate cyst distribution in marine surface sediments off West Africa (6-17°N) in relation to sea-surface conditions, freshwater input and seasonal coastal upwelling. Marine Micropaleontology, 71(3-4), 113-130, https://doi.org/10.1016/j.marmicro.2009.02.001
    Details
    Publication Date: 2024-05-27
    Description: An organic-walled dinoflagellate cyst analysis was carried out on 53 surface sediment samples from West Africa (17-6°N) to obtain insight in the relationship between their spatial distribution and hydrological conditions in the upper water column as well as marine productivity in the study area. Multivariate analysis of the dinoflagellate cyst relative abundances and environmental parameters of the water column shows that sea-surface temperature, salinity, marine productivity and bottom water oxygen are the factors that relate significantly to the distribution patterns of individual species in the region. The composition of cyst assemblages and dinoflagellate cyst concentrations allows the identification of four hydrographic regimes; 1) the northern regime between 17 and 14°N characterized by high productivity associated with seasonal coastal upwelling, 2) the southern regime between 12 and 6°N associated with high-nutrient waters influenced by river discharge 3) the intermediate regime between 14 and 12°N influenced mainly by seasonal coastal upwelling additionally associated with fluvial input of terrestrial nutrients and 4) the offshore regime characterized by low chlorophyll-a concentrations in upper waters and high bottom water oxygen concentrations. Our data show that cysts of Polykrikos kofoidii, Selenopemphix quanta, Dubridinium spp., Echinidinium species, cysts of Protoperidinium monospinum and Spiniferites pachydermus are the best proxies to reconstruct the boundary between the NE trade winds and the monsoon winds in the subtropical eastern Atlantic Ocean. The association of Bitectatodinium spongium, Lejeunecysta oliva, Quinquecuspis concreta, Selenopemphix nephroides, Trinovantedinium applanatum can be used to reconstruct past river outflow variations within this region.
    Keywords: 286; 287; 288; 289; 290; 291; 293; 295; 297; 298; 300; 301; 302; 303; 304; 305; 306; 307; 310; 311; 312; 313; 314; 316; 317; 318; 319; 320; 321; 322; 323; 324; 326; 327; 329; 330; 331; 371; 376; 388; Atlantic Ocean; Center for Marine Environmental Sciences; Eckernfoerder Bay; GeoB9501-4; GeoB9502-5; GeoB9503-3; GeoB9503-5; GeoB9504-4; GeoB9505-3; GeoB9506-3; GeoB9508-4; GeoB9510-3; GeoB9512-4; GeoB9513-5; GeoB9515-2; GeoB9516-4; GeoB9517-5; GeoB9518-4; GeoB9519-6; GeoB9520-4; GeoB9521-3; GeoB9522-2; GeoB9525-5; GeoB9526-4; GeoB9527-6; GeoB9528-1; GeoB9529-1; GeoB9531-2; GeoB9532-1; GeoB9533-3; GeoB9534-4; GeoB9535-5; GeoB9536-4; GeoB9537-4; GeoB9538-5; GeoB9539-1; GeoB9541-1; GeoB9542-1; GeoB9544-1; GeoB9545-1; GeoB9546-1; GEOTROPEX 83, NOAMP I; Giant box corer; GIK16402-1; GIK16404-1; GIK16405-1; GIK16407-1; GIK16414-1; GIK16421-1; GIK16425-1; GIK16437-3; GIK16558-1; GIK16755-1; GIK16764-1; GIK16765-1; GIK16766-1; GIK16767-1; GIK16768-1; GIK16769-1; GKG; Gravity corer (Kiel type); LI198x; Littorina; M6/5; M65; M65/1; MARUM; Mauritania Canyon; Meteor (1964); Meteor (1986); MUC; MultiCorer; off Guinea; SL; van Veen Grab; VGRAB
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
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    Pollen and organic-walled dinoflagellate cyst assemblages of sediment core GeoB9503-5 (2009)
    PANGAEA
    In:  Supplement to: Bouimetarhan, Ilham; Dupont, Lydie M; Schefuß, Enno; Mollenhauer, Gesine; Mulitza, Stefan; Zonneveld, Karin A F (2009): Palynological evidence for climatic and oceanic variability off NW Africa during the late Holocene. Quaternary Research, 72(2), 188-197, https://doi.org/10.1016/j.yqres.2009.05.003
    Details
    Publication Date: 2024-05-27
    Description: Pollen and organic-walled dinoflagellate cyst assemblages from core GeoB 9503-5 retrieved from the mud-belt ( 50 m water depth) off the Senegal River mouth have been analyzed to reconstruct short-term palaeoceanographic and palaeoenvironmental changes in subtropical NW Africa during the time interval from ca. 4200 to 1200 cal yr BP. Our study emphasizes significant coeval changes in continental and oceanic environments in and off Senegal and shows that initial dry conditions were followed by a strong and rapid increase in humidity between ca. 2900 and 2500 cal yr BP. After ca. 2500 cal yr BP, the environment slowly became drier again as indicated by slight increases in Sahelian savannah and desert elements in the pollen record. Around ca. 2200 cal yr BP, this relatively dry period ended with periodic pulses of high terrigenous contributions and strong fluctuations in fern spore and river plume dinoflagellate cyst percentages as well as in the fluxes of pollen, dinoflagellate cysts, fresh-water algae and plant cuticles, suggesting "episodic flash flood" events of the Senegal River. The driest phase developed after about 2100 cal yr BP.
    Keywords: 288; Center for Marine Environmental Sciences; GeoB9503-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL
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  • 4
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    Microcharcoal concentration and elongation, and age model of sediment core MD96-2098 (2015)
    PANGAEA
    In:  Supplement to: Daniau, Anne-Laure; Sanchez Goñi, Maria Fernanda; Martinez, Philippe; Urrego, Dunia H; Bout-Roumazeilles, Viviane; Desprat, Stéphanie; Marlon, Jennifer R (2013): Orbital-scale climate forcing of grassland burning in southern Africa. Proceedings of the National Academy of Sciences, 110(13), 5069-5073, https://doi.org/10.1073/pnas.1214292110
    Details
    Publication Date: 2024-05-27
    Description: Although grassland and savanna occupy only a quarter of the world's vegetation, burning in these ecosystems accounts for roughly half the global carbon emissions from fire. However, the processes that govern changes in grassland burning are poorly understood, particularly on time scales beyond satellite records. We analyzed microcharcoal, sediments, and geochemistry in a high-resolution marine sediment core off Namibia to identify the processes that have controlled biomass burning in southern African grassland ecosystems under large, multimillennial-scale climate changes. Six fire cycles occurred during the past 170,000 y in southern Africa that correspond both in timing and magnitude to the precessional forcing of north-south shifts in the Intertropical Convergence Zone. Contrary to the conventional expectation that fire increases with higher temperatures and increased drought, we found that wetter and cooler climates cause increased burning in the study region, owing to a shift in rainfall amount and seasonality (and thus vegetation flammability). We also show that charcoal morphology (i.e., the particle's length-to-width ratio) can be used to reconstruct changes in fire activity as well as biome shifts over time. Our results provide essential context for understanding current and future grassland-fire dynamics and their associated carbon emissions.
    Keywords: CALYPSO; Calypso Corer; IMAGES; IMAGES II; International Marine Global Change Study; Lüderitz Transect; Marion Dufresne (1995); MD105; MD962098; MD96-2098
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    Format: application/zip, 2 datasets
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  • 5
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    Organic-walled dinoflagellate cyst analysis of sediment core GeoB8331-4 and from surface sediment samples off western South Africa (2017)
    PANGAEA
    In:  Supplement to: Zhao, Xueqin; Dupont, Lydie M; Schefuß, Enno; Bouimetarhan, Ilham; Wefer, Gerold (2017): Palynological evidence for Holocene climatic and oceanographic changes off western South Africa. Quaternary Science Reviews, 165, 88-101, https://doi.org/10.1016/j.quascirev.2017.04.022
    Details
    Publication Date: 2024-05-27
    Description: Atmospheric and oceanographic interactions between the Atlantic and Indian Oceans influence upwelling in the southern Benguela upwelling system. In order to obtain a better knowledge of paleoceanographic and paleoenvironmental changes in the southern Benguela region during the Holocene, 12 marine surface sediment samples and one gravity core GeoB8331-4 from the Namaqualand mudbelt off the west coast of South Africa have been studied for organic-walled dinoflagellate cysts in high temporal resolution. The results are compared with pollen and geochemical records from the same samples. Our study emphasizes significantly distinct histories in upwelling intensity as well as the influence of fluvial input during the Holocene. Three main phases were identified for the Holocene. High percentages of cysts produced by autotrophic taxa like Operculodinium centrocarpum and Spiniferites spp. indicate warmer and stratified conditions during the early Holocene (9900-8400 cal. yr BP), suggesting reduced upwelling likely due to a northward shift of the southern westerlies. In contrast, the middle Holocene (8400-3100 cal. yr BP) is characterized by a strong increase in heterotrophic taxa in particular Lejeunecysta paratenella and Echinidinium spp. at the expense of autotrophic taxa. This indicates cool and nutrient-rich waters with active upwelling probably caused by a southward shift of the southern westerlies. During the late Holocene (3100 cal. yr BP to modern), Brigantedinium spp. and other abundant taxa interpreted to indicate fluvial nutrient input such as cyst of Protoperidinium americanum and Lejeunecysta oliva imply strong river discharge with high nutrient supply between 3100 and 640 cal. yr BP.
    Keywords: Center for Marine Environmental Sciences; MARUM; RAiN; Regional Archives for Integrated iNvestigations
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  • 6
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    Dinoflagellate cyst assemblages, Mg/Ca based reconstructed temperatures, stable carbon isotopes, and geochemical parameters of sediment core GeoB9508-5 (2013)
    PANGAEA
    In:  Supplement to: Bouimetarhan, Ilham; Groeneveld, Jeroen; Dupont, Lydie M; Zonneveld, Karin A F (2013): Low- to high- productivity pattern within Heinrich stadial 1: Inferrences from dinoflagellate cyst records off Senegal. Global and Planetary Change, https://doi.org/10.1016/j.gloplacha.2013.03.007
    Details
    Publication Date: 2024-05-27
    Description: In order to investigate a possible connection between tropical northeast (NE) Atlantic primary productivity, Atlantic meridional overturning circulation (AMOC), and drought in the Sahel region during Heinrich Stadial 1 (HS1), we used dinoflagellate cyst (dinocyst) assemblages, Mg/Ca based reconstructed temperatures, stable carbon isotopes (d13C) and geochemical parameters of a marine sediment core (GeoB 9508-5) from the continental slope offshore Senegal. Our results show a two-phase productivity pattern within HS1 that progressed from an interval of low marine productivity between ~ 19 and 16 kyr BP to a phase with an abrupt and large productivity increase from ~ 16 to 15 kyr BP. The second phase is characterized by distinct heavy planktonic d13C values and high concentrations of heterotrophic dinocysts in addition to a significant cooling signal based on reconstructions of past sea surface temperatures (SST). We conclude that productivity variations within HS1 can be attributed to a substantial shift of West African atmospheric processes. Taken together our results indicate a significant intensification of the North East (NE) trade winds over West Africa leading to more intense upwelling during the last millennium of HS1 between ~ 16 and 15 kyr BP, thus leaving a strong imprint on the dinocyst assemblages and sea surface conditions. Therefore, the two-phase productivity pattern indicates a complex hydrographic setting suggesting that HS1 cannot be regarded as uniform as previously thought.
    Keywords: Center for Marine Environmental Sciences; MARUM
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    Format: application/zip, 2 datasets
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  • 7
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    Charcoal records of two sediment cores off SW Africa (2012)
    PANGAEA
    In:  Supplement to: Daniau, Anne-Laure; Bartlein, Patrick J; Harrison, S P; Prentice, Iain Colin; Brewer, Simon; Friedlingstein, Pierre; Harrison-Prentice, T I; Inoue, J; Izumi, K; Marlon, Jennifer R; Mooney, Scott D; Power, Mitchell J; Stevenson, J; Tinner, Willy; Andric, M; Atanassova, J; Behling, Hermann; Black, M; Blarquez, O; Brown, K J; Carcaillet, C; Colhoun, Eric A; Colombaroli, Daniele; Davis, Basil A S; D'Costa, D; Dodson, John; Dupont, Lydie M; Eshetu, Z; Gavin, D G; Genries, A; Haberle, Simon G; Hallett, D J; Hope, Geoffrey; Horn, S P; Kassa, T G; Katamura, F; Kennedy, L M; Kershaw, A Peter; Krivonogov, S; Long, C; Magri, Donatella; Marinova, E; McKenzie, G Merna; Moreno, P I; Moss, Patrick T; Neumann, F H; Norstrom, E; Paitre, C; Rius, D; Roberts, Neil; Robinson, G S; Sasaki, N; Scott, Louis; Takahara, H; Terwilliger, V; Thevenon, Florian; Turner, R; Valsecchi, V G; Vannière, Boris; Walsh, M; Williams, N; Zhang, Yancheng (2012): Predictability of biomass burning in response to climate changes. Global Biogeochemical Cycles, 26(4), https://doi.org/10.1029/2011GB004249
    Details
    Publication Date: 2024-05-27
    Description: We analyze sedimentary charcoal records to show that the changes in fire regime over the past 21,000 yrs are predictable from changes in regional climates. Analyses of paleo- fire data show that fire increases monotonically with changes in temperature and peaks at intermediate moisture levels, and that temperature is quantitatively the most important driver of changes in biomass burning over the past 21,000 yrs. Given that a similar relationship between climate drivers and fire emerges from analyses of the interannual variability in biomass burning shown by remote-sensing observations of month-by-month burnt area between 1996 and 2008, our results signal a serious cause for concern in the face of continuing global warming.
    Keywords: Center for Marine Environmental Sciences; MARUM
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  • 8
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    Southeast African provenance study (2017)
    PANGAEA
    In:  Supplement to: Hahn, Annette; Miller, Charlotte; Andó, Sergio; Bouimetarhan, Ilham; Cawthra, Hayley C; Garzanti, Eduardo; Green, Andrew N; Radeff, Giuditta; Schefuß, Enno; Zabel, Matthias (2018): The provenance of terrigenous components in marine sediments along the east coast of southern Africa. Geochemistry, Geophysics, Geosystems, 19(7), 1946-1962, https://doi.org/10.1029/2017GC007228
    Details
    Publication Date: 2024-05-27
    Description: Terrestrial signals in marine sediment archives are often used for paleoclimatic reconstructions. It is therefore important to know the origin of the different terrestrial sedimentary components. The proximity to a river mouth is often the key location to determine the source. Especially in regions with strong ocean currents, such an assumption might,however, lead to considerable misinterpretations. To investigate the source of various terrigenous sediment fractions in southeastern Africa, a region with strong sediment redistribution, we have performed an extensive comparison between terrestrial material (pollen, plant lipids, detrital modes and heavy minerals as well as bulk inorganic geochemical composition) from potential source regions and the same components in the adjacent coastal and continental shelf sediments. Onshore the proxy‐indicators reflect small‐scale diversity in sampling locations and associated environments (riverbank sediments, flood deposits, suspension loads and soils). Nevertheless, the overall trends reflect significant environmental gradients along a SW to NE transect. We note a general comparability of the studied parameters between the continental and marine sediments regardless of their specific differences in transport and depositional characteristics. We propose that the influence of the Agulhas Current affects sediment deposition and distribution only seaward of the mid‐shelf and that pockets of sediment remain preserved in the lee of coastal protrusions where they are protected from erosion. This study provides the essential prerequisite to allow the attribution of temporal variations of compositional changes in marine sediment cores to environmental changes in southeastern Africa.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 9
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    Pollen analysis of river surface sediment samples and marine sediment cores from southwestern Morocco (2018)
    PANGAEA
    In:  Supplement to: Zhao, Xueqin; Dupont, Lydie M; Cheddadi, Rachid; Kölling, Martin; Reddad, Hanane; Groeneveld, Jeroen; Ain-Lhout, Fatima Zohra; Bouimetarhan, Ilham (2019): Recent climatic and anthropogenic impacts on endemic species in southwestern Morocco. Quaternary Science Reviews, 221, 105889, https://doi.org/10.1016/j.quascirev.2019.105889
    Details
    Publication Date: 2024-05-27
    Description: Morocco is an area subject to recurrent severe droughts, desertification and an increasing land degradation. It is within a Mediterranean hotspot of biodiversity as it harbors many threatened endemic species such as the argan tree (Argania spinosa). In this context, past climate records are needed to analyze the impact of climate variability on the occurrence and future persistence of these endemic species. In order to evaluate the impact of past climate changes on the endemic Argan tree in southern Morocco, we reconstructed its modern range using an extensive pollen dataset. The modern pollen distribution off southwestern Morocco was then utilized to interpret the high-resolution pollen record with complementary micro-charcoal and XRF element records from a marine sediment core GeoB8601-3 off Cape Ghir in southwestern Morocco covering the last three millennia. This multi-proxy study has shown clear evidence of wetter conditions resulting in higher fluvial input which could be correlated with a negative mode of the North Atlantic Oscillation (NAO), in contrast to the published pollen and XRF element records from another nearby core that showed limited effect of climate changes. On the other hand, clear opposite trend between the pollen occurrences of Argania spinosa and the fire frequency was observed throughout our fossil record. The increase of Argania spinosa pollen occurrences, along with herbaceous taxa, and lower fire frequency might suggest an increase in human impact on the landscape leading to a sparse vegetation cover and subsequently increased erosion. The reconstructed pollen-based vegetation, micro-charcoal-based fire activities and geochemical changes in our marine record suggest interplay of climate and anthropogenic effects on the landscape.
    Keywords: Center for Marine Environmental Sciences; MARUM
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    Format: application/zip, 3 datasets
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  • 10
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    Pollen, XRF, microcharcoal and mean air annual temperature of the CO3 and CO14 records, Colônia Basin, São Paulo-Brazil (2019)
    PANGAEA
    In:  Supplement to: Rodríguez-Zorro, Paula A; Ledru, Marie-Pierre; Bard, Edouard; Aquino-Alfonso, Olga; Camejo, Adriana; Daniau, Anne-Laure; Favier, Charly; García, Marta; Mineli, Thays D; Rostek, Frauke; Ricardi-Branco, Fresia; Sawakuchi, André Oliveira; Simon, Quentin; Tachikawa, Kazuyo; Thouveny, Nicolas (2020): Shut down of the South American summer monsoon during the penultimate glacial. Scientific Reports, 10(1), https://doi.org/10.1038/s41598-020-62888-x
    Details
    Publication Date: 2024-05-27
    Description: We analysed changes in mean air annual temperature (MAAT), vegetation and biomass burning on a long and continuous lake-peat sediment record from the Colônia basin, southeastern Brazil, examining the responses of a wet tropical rainforest over the last 180 ka. Stronger southern atmospheric circulation up to the latitude of Colônia was found for the penultimate glacial with lower temperatures than during the last glacial, while strengthening of the South American summer monsoon (SASM) circulation started during the last interglacial and progressively enhanced a longer wet summer season from 95 ka until the present. Past MAAT variations and fire history were possibly modulated by eccentricity, although with signatures which differ in average and in amplitude between the last 180 ka. Vegetation responses were driven by the interplay between the SASM and southern circulation linked to Antarctic ice volume, inferred by the presence of a cool mixed evergreen forest from 180 to 45 ka progressively replaced by a rainforest. We report cooler temperatures during the marine isotope stage 3 (MIS 3: 57-29 ka) than during the Last Glacial Maximum (LGM: 23-19 ka). Our findings show that tropical forest dynamics display different patterns than mid-latitude during the last 180 ka.
    Keywords: Araucaria; Atlantic forest; Glacial; Interglacial; peat-lake
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    Format: application/zip, 5 datasets
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  • 11
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    The Arctic picoeukaryote Micromonas pusilla benefits from Ocean Acidification under constant and dynamic light (2019)
    PANGAEA
    In:  Supplement to: White, Emily; Hoppe, Clara Jule Marie; Rost, Björn (2020): The Arctic picoeukaryote Micromonas pusilla benefits from ocean acidification under constant and dynamic light. Biogeosciences, 17(3), 635-647, https://doi.org/10.5194/bg-17-635-2020
    Details
    Publication Date: 2024-05-27
    Description: Compared to the rest of the globe, the Arctic Ocean is affected disproportionately by climate change. Despite these fast environmental changes, we currently know little about the effects of ocean acidification (OA) on marine key species in this area. Moreover, the existing studies typically test the effects of OA under constant, hence artificial light fields. In this study, the abundant Arctic picoeukaryote Micromonas pusilla was acclimated to current (400 μatm) and future (900 μatm) pCO2 levels under a constant as well as dynamic light, simulating more realistic light fields as experienced in the upper mixed layer. To describe and understand the responses to these drivers, growth, particulate organic carbon (POC) production, elemental composition, photophysiology and reactive oxygen species (ROS) production were analysed. M. pusilla was able to benefit from OA on various scales, ranging from an increase in growth rates to enhanced photosynthetic capacity, irrespective of the light regime. These beneficial effects were, however, not reflected in the POC production rates, which can be explained by energy partitioning towards cell division rather than biomass build-up. In the dynamic light regime, M. pusilla was able to optimise its photophysiology for effective light usage during both low and high light periods. This effective photoacclimation, which was achieved by modifications to photosystem II (PSII), imposed high metabolic costs leading to a reduction in growth and POC production rates when compared to constant light. There were no significant interactions observed between dynamic light and OA, indicating that M. pusilla was able maintain effective photoacclimation without increased photoinactivation under high pCO2. Based on these findings, M. pusilla may exhibit a robust positive response to future Arctic Ocean conditions
    Keywords: Arctic Ocean; Dynamic Light; Ocean acidification; photophysiology; Picoeukaryotes; PSII
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  • 12
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    Organic-walled dinoflagellate cyst of marine surface sediments and two sediment cores off southwestern Morocco (2020)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Description: Organic-walled dinoflagellate cyst of marine surface sediments and two sediment cores (GeoB8601-3 and GeoB4223-1) off southwestern Morocco.
    Keywords: Center for Marine Environmental Sciences; MARUM
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    Format: application/zip, 3 datasets
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  • 13
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    Thermoluminescence (TL) and optically stimulated luminescence (OSL) sensitivities, and IRSL/OSL measurements for core GL-1248 (off Parnaíba River drainage basin, northern northeastern Brazil) (2022)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Description: Marine sediment core GL-1248 was collected from the continental slope off northern northeastern Brazil by Petrobras oil company. Sediment samples (154 in total) were collected with 2 cm wide scoops at every 10 cm from the uppermost 16 m (covering the the last 113 thousand years) of the marine sediment core GL-1248. Samples were oven‐dried at 60°C, precisely weighted to 0.5 g and treated with H2O2 27% and HCl 10% to remove organic matter and calcium carbonate, respectively. The remaining content was diluted in alcohol and three aliquots per sample were mounted on stainless steel discs with four drops of the homogenized solution of alcohol and silt/clay sediments. GL-1248 luminescence measurements were performed on an automated Lexsyg Smart TL/OSL reader equipped with blue and infrared LEDs, Hoya U-340 filters for light detection in the ultraviolet band (270-390 nm) using a photomultiplier and beta radiation sources (90Sr/90Y) with doses rate of 0.116 Gy s-1 at the Luminescence and Gamma Spectrometry Laboratory of the Institute of Geosciences, University of São Paulo, Brazil. The sensitivity representative of the 110°C thermoluminesce (TL) peak of quartz considered the 80–120°C integration range from the TL curve. The 80-120°C TL sensitivity was calculated as a percentage of the total TL emission (0-250°C) and using the background TL curve. The mean of three measured aliquots represents the TL sensitivity of each sample. The OSL sensitivity was calculated by integrating the first second of light emission and the last ten seconds as background. GL-1248 TL sensitivity data were compared to previously published data obtained from marine sediment core GeoB16206-1 (https://doi.org/10.1594/PANGAEA.904357). Marine sediment core GeoB16206-1 was analyzed in a different luminescence reader (i.e. RisØ OSL/TL DA-20 reader) and using different regeneration dose. In order to avoid machine artifacts and the influence of dose size on sensitivity, we normalized the TL data output from both marine sediment cores and produced a composite record. Name of the Campaign: collected by the Petrobras oil company Event Label: GL1248 (GL-1248) Method: quarzt luminescence sensitivity Latitude: -0.920000 Longitude: -43.401667 Elevation: -2,264 m
    Keywords: Luminescence sensitivity; northeastern Brazil; precipitation reconstruction; quartz grains; South America
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  • 14
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    Documentation of sediment core GeoB9531-1 (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: 316; Center for Marine Environmental Sciences; GeoB9531-1; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL
    Type: Dataset
    Format: unknown
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  • 15
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    Documentation of sediment core GeoB9532-2 (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: 317; Center for Marine Environmental Sciences; GeoB9532-2; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL
    Type: Dataset
    Format: unknown
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  • 16
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    Documentation of sediment core GeoB9533-2 (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: 318; Center for Marine Environmental Sciences; GeoB9533-2; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL
    Type: Dataset
    Format: unknown
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  • 17
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    Documentation of sediment core GeoB9534-5 (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: 319; Center for Marine Environmental Sciences; GeoB9534-5; Gravity corer (Kiel type); M65/1; MARUM; Meteor (1986); SL
    Type: Dataset
    Format: unknown
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  • 18
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    Pollen, non-pollen palynomorphs, LOI, micro- and macrocharcoal and C14 records from core Razdolye, Kursk region, Russia (2023)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Description: The dataset represent pollen, non-pollen palynomorphs, LOI, micro- and macrocharcoal and C14 records from core Razdolye, Kursk region, Russia. The core Razdolye was collected in 2009 by Lyudmila Shumilovskikh, Frank Schlütz, Jens Schneeweiß and Oleg Radyush with a Russian corer. Laboratory processing for palynological studies took place in the Dep. Palynology and Climate Dynamics, Georg-August-University of Göttingen in 2009 by Lyudmila Shumilovskikh and 2020 by Monika Schmidt. For each palynological sample, one millilitre of material was treated with hydrochloric acid, potassium hydroxide, hydrofluoric acid, acetolysis mixture, microsieved (6 μm) and stored in glycerol. Before acid, Lycopodium spores were added to calculate pollen influx. Microscopic identification and counting were carried out by Monika Schmidt. Standard microscopical magnification was 400×, for ambiguous objects 1000x with oil immersion. Identification and morphological pollen types follow Beug (2004) and type collections of the Dep. Palynology and Climate Dynamics, Georg-August-University of Göttingen. Non-pollen palynomorphs (NPP) follow Miola (2012) and the Non-Pollen Palynomorphs Image Database (NPP ID, http://non-pollen-palynomorphs.uni-goettingen.de/). New NPP types were described and have been uploaded to the Non-Pollen Palynomorphs Image Database (NPP ID, http://non-pollen-palynomorphs.uni-goettingen.de/). In addition, pieces of burnt plant fragments of 〉 50 µm were counted. Laboratory processing for macrocharcoal took place in the Dep. Palynology and Climate Dynamics, Georg-August-University of Göttingen in 2020 by Monika Schmidt. These samples were treated in the laboratory in Sodium Hexametaphosphate and in bleach, living overnight after each treatment and followed by sieving through 125 µm sieve. Counting of charcoal particles was carried out under a binocular microscope under 10× to 15× magnification. Samples for loss-on-ignition was processed by Monika Schmidt in 2021. Samples (1 ml) were obtained at 2 cm intervals (44 samples). LOI samples were oven-dried for 22 hours at 105 °C, for 4 hours at 550 °C and for 2 hours at 950 °C (Dean 1974; Heiri et al. 2001). LOI records are given as percentages. For an absolute chronology, bulk samples, macroremains and pollen were dated by the radiocarbon laboratories of Poznan (Poland).
    Keywords: charcoal; forest-steppe ecotone; Late Holocene; loss on ignition; macrocharcoal; Microcharcoal; non-pollen palynomorphs; Pollen
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 19
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    Summary of Bayesian onset detection algorithm for abrupt warming transitions in the NGRIP record (2023)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Description: Summary statistics of posterior marginal distribution of the onset of abrupt warming transitions located in the last glacial age of the NGRIP record, based on both the d18O and Ca2+ proxy. Includes both statistics for the onset depth as well as age transition. Onset depth is found by applying a linear ramp function (Erhardt et al. 2019) which is combined with a probabilistic age-depth model to infer the onset age of the transition.
    Keywords: Abrupt Warming; Bayesian; Greenland; Ice core; ICEDRILL; Ice drill; NGRIP; NorthGRIP; onset; Sampling/drilling ice; Summary; TiPES; Tipping Points in the Earth System; transition
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 20
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    Global REVEALS reconstruction of past vegetation cover for taxonomically harmonized pollen data sets (2023)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Description: This data set presents the reconstructed vegetation cover for 3491 sites based on harmonized pollen data from the data set LegacyPollen 2.0 (https://doi.pangaea.de/10.1594/PANGAEA.965907). 1115 sites are located in North America, 1435 in Europe, 533 in Asia, 173 in South America, 155 in Africa, and 80 in the Indopacific. Sugita's REVEALS model (2007) was applied to all pollen records using REVEALSinR from the DISQOVER package (Theuerkauf et al. 2016). Pollen counts were translated into vegetation cover by accounting for taxon-specific pollen productivity and fall speed. Additionally, relevant source areas of pollen were calculated using the aforementioned taxon-specific parameters and a gaussian plume model for deposition and dispersal. Values for relative pollen productivity and fall speed from the synthesis from Wiezcorek and Herzschuh (2010) were used for the reconstruction of vegetation cover. The average values from all Northern Hemisphere values were used where taxon-specific continental values were not available. This includes records of the Southern Hemisphere. We present tables with reconstructed vegetation cover for all continents with original parameters. As further details we list a table with the taxon-specific parameters used and a list of parameters adjusted in the default version of REVEALSinR.
    Keywords: AWI_Envi; fossil pollen; paleoecology; Polar Terrestrial Environmental Systems @ AWI; REVEALS
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 21
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    Pollen distribution of sediment core MD96-2048 from the Western Indian Ocean (2011)
    PANGAEA
    In:  Supplement to: Dupont, Lydie M; Caley, Thibaut; Kim, Jung-Hyun; Castañeda, Isla S; Malaizé, Bruno; Giraudeau, Jacques (2011): Glacial-interglacial vegetation dynamics in South Eastern Africa coupled to sea surface temperature variations in the Western Indian Ocean. Climate of the Past, 7(4), 1209-1224, https://doi.org/10.5194/cp-7-1209-2011
    Details
    Publication Date: 2024-05-27
    Description: Glacial-interglacial fluctuations in the vegetation of South Africa might elucidate the climate system at the edge of the tropics between the Indian and Atlantic Oceans. However, vegetation records covering a full glacial cycle have only been published from the eastern South Atlantic. We present a pollen record of the marine core MD96-2048 retrieved by the Marion Dufresne from the Indian Ocean ~120 km south of the Limpopo River mouth. The sedimentation at the site is slow and continuous. The upper 6 m (spanning the past 342 Ka) have been analysed for pollen and spores at millennial resolution. The terrestrial pollen assemblages indicate that during interglacials, the vegetation of eastern South Africa and southern Mozambique largely consisted of evergreen and deciduous forests. During glacials open mountainous scrubland dominated. Montane forest with Podocarpus extended during humid periods was favoured by strong local insolation. Correlation with the sea surface temperature record of the same core indicates that the extension of mountainous scrubland primarily depends on sea surface temperatures of the Agulhas Current. Our record corroborates terrestrial evidence of the extension of open mountainous scrubland (including fynbos-like species of the high-altitude Grassland biome) for the last glacial as well as for other glacial periods of the past 300 Ka.
    Keywords: Acacia; Acalypha; Acanthaceae; Afraegle; Afrormosia; Afzelia; Age model; Aizoaceae; Alchornea; Alismataceae; Allophylus; Aloe-type; Amaranthaceae/Chenopodiaceae; Anemia-type; Anthoceros; Anthospermum; Artemisia (Africa); Avicennia; Balanites; Baphia-type; Blighia-type; Borassus-type; Borreria; Boscia-type; Brachystegia; Bridelia; Burkea; Butyrospermum; Buxus-type madagascaria; Caesalpinioideae; CALYPSO; Calypso Corer; Campanulaceae; Canthium; Caperonia; Capparis; Caryophyllaceae; Cassia-type; Casuarina; Celastraceae/Hippocrateaceae; Celtis; Center for Marine Environmental Sciences; Cephalosphaera; Chrysophyllum; Cissus; Clematis-type; Cleome; Cliffortia; Cnestis-type; Coffea-type; Cola cordifolia; Combretaceae/Melastomataceae; Commelinaceae; Commiphora; Compositae Liguliflorae; Compositae Tubuliflorae; Compositae Vernonieae; Cotula-type; Counting, palynology; Crossopteryx; Crotalaria; Croton-type; Cucumis; Cussonia; Cuviera; Cynometra-type; Cyperaceae (africa); Daisy-type; Daniellia-type; Deinbollia-type; DEPTH, sediment/rock; Dialium-type; Dicliptera-type; Diospyros; Dodonaea villosa; Dombeya-type; Dracaena; Elaeis guineensis; Erica (Africa); Erythrina; Euclea; Eugenia; Euphorbia; Euphorbiaceae undifferentiated; Evolvulus-type; Fadogia-type; Fagonia; Fern spores; Flabellaria; Gaertnera; Galium; Garcinia; Gazania-type; Grewia; Gunnera perpensa; Haplocoelum; Heritiera-type; Hermannia; Hymenocardia; Hyphaene; Hypoestes type; Ilex cf.. mitis; Indigofera-type; Isoberlinia-type; Justicia-type; Khaya; Kigelia-type; Klaineanthus; Lannea; Leea; Leonotis; Liliaceae; Limnophyton-type; Lobelia (Africa); Lonchocarpus; Lophira; Luffa; Lumnitzera racemosa; Lycopodium (Africa); Lycopodium cernuum; Macaranga; Mallotus; Manilkara; Marion Dufresne (1995); Marker, added; Marker, found; MARUM; MD104; MD96-2048; Melochia; Millettia; Mimosoideae; Mitragyna; Moraceae; Morelia senegalensis; Myrica; Myrsine africana; Nyctaginaceae; Nymphaea; Ochna; Ocimum; Olea; Ormocarpum; Oxygonum; Pandanus; Papilionoideae; Parinari; Passerina montana; PEGASE; Pelargonium; Peltophorum africanum; Pentabrachion-type reticulatum; Pentzia-type; Petalidium; Petersianthus macrocarpus; Phaeoceros; Phoenix; Piliostigma; Piptadeniastrum-type africanum; Plantago; Poaceae undifferentiated; Podocarpus; Pollen, total; Polycarpaea-type; Polygonum aviculare-type; Polygonum senegalense-type; Protea; Pseudolachnostylis-type; Psychotria; Psydrax-type subcordata; Pteris; Pterocarpus; Raphia; Rauvolfia; Restionaceae; Rhamnaceae; Rhizophora; Rhus-type; Rhynchosia-type; Rubiaceae monade; Ruellia; Rumex; Sapotaceae; Sapotaceae/Meliaceae; Scabiosa-type; Schefflera; Schrebera; Scrophulariaceae (Africa); Securinega; Selago-type; Solanum; Sorindeia-type juglandifolia; Spirostachys africana; Stephanocolporate striatoreticulate; Sterculia-type; Stereospermum; Stipularia africana; Stoebe-type; Strophanthus-type; Strychnos; Sutera-type; Tamarindus-type indica; Tapinanthus; Teclea-type; Tephrosia-type; Tetrorchidium; Thymelaeaceae; Tribulus; Trichilia; Typha angustifolia-type; Uapaca; Urticaceae; Volume; Waltheria; Zaluzianskya-type; Zanthoxylum; Ziziphus-type; Zygophyllum
    Type: Dataset
    Format: text/tab-separated-values, 24360 data points
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  • 22
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    Seawater carbonate chemistry and biological processes of coccolithophore (Gephyrocapsa oceanica and Coccolithus pelagicus ssp. braarudii) during experiments, 2011 (2010)
    PANGAEA
    In:  Supplement to: Rickaby, Rosalind E M; Henderiks, Jorijntje; Young, J N (2010): Perturbing phytoplankton: response and isotopic fractionation with changing carbonate chemistry in two coccolithophore species. Climate of the Past, 6(6), 771-785, https://doi.org/10.5194/cp-6-771-2010
    Details
    Publication Date: 2024-05-27
    Description: All species of coccolithophore appear to respond to perturbations of carbonate chemistry in a different way. Here, we show that the degree of malformation, growth rate and stable isotopic composition of organic matter and carbonate produced by two contrasting species of coccolithophore (Gephyrocapsa oceanica and Coccolithus pelagicus ssp. braarudii) are indicative of differences between their photosynthetic and calcification response to changing DIC levels (ranging from ~1100 to ~7800 µmol/kg) at constant pH (8.13 ± 0.02). Gephyrocapsa oceanica thrived under all conditions of DIC, showing evidence of increased growth rates at higher DIC, but C. braarudii was detrimentally affected at high DIC showing signs of malformation, and decreased growth rates. The carbon isotopic fractionation into organic matter and the coccoliths suggests that C. braarudii utilises a common internal pool of carbon for calcification and photosynthesis but G. oceanica relies on independent supplies for each process. All coccolithophores appear to utilize bicarbonate as their ultimate source of carbon for calcification resulting in the release of a proton. But, we suggest that this proton can be harnessed to enhance the supply of CO2(aq) for photosynthesis either from a large internal HCO3- pool which acts as a pH buffer (C. braarudii), or pumped externally to aid the diffusive supply of CO2 across the membrane from the abundant HCO3- (G. oceanica), likely mediated by an internal and external carbonic anhydrase respectively. Our simplified hypothetical spectrum of physiologies may provide a context to understand different species response to changing pH and DIC, the species-specific delta p and calcite "vital effects", as well as accounting for geological trends in coccolithophore cell size.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcite saturation state; Calculated, see reference(s); Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, particulate, per cell; Carbon, inorganic, particulate, production per cell; Carbon, organic, particulate; Carbon, organic, particulate, per cell; Carbon, organic, particulate, production per cell; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Carbon, total, particulate; Carbon, total, particulate, per cell; Carbon, total, particulate, production per cell; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Coccolithus braarudii; Coccolithus braarudii, collapsed spheres; Coccolithus braarudii, intact spheres; Coccolithus braarudii, malformed; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gephyrocapsa oceanica; Growth/Morphology; Growth rate; Haptophyta; Laboratory experiment; Laboratory strains; Light:Dark cycle; Mass spectrometer ANCA-SL 20-20 Europa Scientific; Mass spectrometer Finnigan Delta-S; Measured; Nitrogen, organic, particulate; Nitrogen, organic, particulate, per cell; Nitrogen, organic, particulate, production per cell; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Pelagos; pH; Phytoplankton; Primary production/Photosynthesis; Radiation, photosynthetically active; Salinity; Single species; Species; Temperature, water; δ13C, carbon dioxide, atmospheric; δ13C, dissolved inorganic carbon
    Type: Dataset
    Format: text/tab-separated-values, 1647 data points
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  • 23
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    Seawater carbonate chemistry and biological processes of Emiliania huxleyi (PML B92/11) during experiments, 2011 (2011)
    PANGAEA
    In:  Supplement to: Borchard, Corinna; Borges, Alberto Vieira; Händel, Nicole; Engel, Anja (2011): Biogeochemical response of Emiliania huxleyi (PML B92/11) to elevated CO2 and temperature under phosphorous limitation: A chemostat study. Journal of Experimental Marine Biology and Ecology, 410, 61-71, https://doi.org/10.1016/j.jembe.2011.10.004
    Details
    Publication Date: 2024-05-27
    Description: The present study investigates the combined effect of phosphorous limitation, elevated partial pressure of CO2 (pCO2) and temperature on a calcifying strain of Emiliania huxleyi (PML B92/11) by means of a fully controlled continuous culture facility. Two levels of phosphorous limitation were consecutively applied by renewal of culture media (N:P = 26) at dilution rates (D) of 0.3 d- and 0.1 d-1. CO2 and temperature conditions were 300, 550 and 900 µatm pCO2 at 14 °C and 900 µatm pCO2 at 18 °C. In general, the steady state cell density and particulate organic carbon (POC) production increased with pCO2, yielding significantly higher concentrations in cultures grown at 900 µatm pCO2 compared to 300 and 550 µatm pCO2. At 900 µatm pCO2, elevation of temperature as expected for a greenhouse ocean, further increased cell densities and POC concentrations. In contrast to POC concentration, C-quotas (pmol C cell-1) were similar at D = 0.3 d-1 in all cultures. At D = 0.1 d-1, a reduction of C-quotas by up to 15% was observed in the 900 µatm pCO2 at 18 °C culture. As a result of growth rate reduction, POC:PON:POP ratios deviated strongly from the Redfield ratio, primarily due to an increase in POC. Ratios of particulate inorganic and organic carbon (PIC:POC) ranged from 0.14 to 0.18 at D = 0.3 d-1, and from 0.11 to 0.17 at D = 0.1 d-1, with variations primarily induced by the changes in POC. At D = 0.1 d-1, cell volume was reduced by up to 22% in cultures grown at 900 µatm pCO2. Our results indicate that changes in pCO2, temperature and phosphorus supply affect cell density, POC concentration and size of E. huxleyi (PML B92/11) to varying degrees, and will likely impact bloom development as well as biogeochemical cycling in a greenhouse ocean.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated, see reference(s); Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, particulate; Carbon, organic, particulate, production per cell; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Carbon, organic, particulate/Phosphorus, organic, particulate ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Colorimetry; Element analyser CNS, EURO EA; Emiliania huxleyi; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Experiment day; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Haptophyta; Infrared gas analyzer (LI-COR LI-6252); Laboratory experiment; Laboratory strains; Light:Dark cycle; Macro-nutrients; Measured; Nitrate; Nitrogen, inorganic, dissolved; Nitrogen, organic; Nitrogen, organic, particulate/Phosphorus, organic, particulate ratio; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, per cell; Particulate organic carbon production; Particulate organic nitrogen per cell; Particulate organic nitrogen production; Particulate organic phosphorus per cell; Particulate organic phosphorus production; Pelagos; pH; Phosphate; Phosphorus, inorganic; Phosphorus, organic, particulate; Phosphorus, organic, particulate, production per cell; Phytoplankton; Primary production/Photosynthesis; Production of particulate organic nitrogen; Radiation, photosynthetically active; Revelle factor; Salinity; Salinometer - Tropic Marin Sea Salt, Dr. Biener GmbH, Germany; Sample ID; Single species; Spectrophotometry; Temperature; Temperature, water; WTW 340i pH-analyzer and WTW SenTix 81-electrode
    Type: Dataset
    Format: text/tab-separated-values, 1068 data points
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  • 24
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    Experiment: Dissecting the impact of CO2 and pH on the mechanisms of photosynthesis and calcification in the coccolithophore Emiliania huxleyi (2013)
    PANGAEA
    In:  Supplement to: Bach, Lennart Thomas; Mackinder, Luke C M; Schulz, Kai Georg; Wheeler, Glen; Schroeder, Declan C; Brownlee, Colin; Riebesell, Ulf (2013): Dissecting the impact of CO2 and pH on the mechanisms of photosynthesis and calcification in the coccolithophore Emiliania huxleyi. New Phytologist, 199(1), 121-134, https://doi.org/10.1111/nph.12225
    Details
    Publication Date: 2024-05-27
    Description: Coccolithophores are important calcifying phytoplankton predicted to be impacted by changes in ocean carbonate chemistry caused by the absorption of anthropogenic CO2. However, it is difficult to disentangle the effects of the simultaneously changing carbonate system parameters (CO2, bicarbonate, carbonate and protons) on the physiological responses to elevated CO2. Here, we adopted a multifactorial approach at constant pH or CO2 whilst varying dissolved inorganic carbon (DIC) to determine physiological and transcriptional responses to individual carbonate system parameters. We show that Emiliania huxleyi is sensitive to low CO2 (growth and photosynthesis) and low bicarbonate (calcification) as well as low pH beyond a limited tolerance range, but is much less sensitive to elevated CO2 and bicarbonate. Multiple up-regulated genes at low DIC bear the hallmarks of a carbon-concentrating mechanism (CCM) that is responsive to CO2 and bicarbonate but not to pH. Emiliania huxleyi appears to have evolved mechanisms to respond to limiting rather than elevated CO2. Calcification does not function as a CCM, but is inhibited at low DIC to allow the redistribution of DIC from calcification to photosynthesis. The presented data provides a significant step in understanding how E. huxleyi will respond to changing carbonate chemistry at a cellular level
    Keywords: Alkalinity, total; alpha carbonic anhydrase 1; alpha carbonic anhydrase 1, standard error; alpha carbonic anhydrase 2; alpha carbonic anhydrase 2, standard error; Anion exchanger like 1; Anion exchanger like 1, standard error; Aquaporin 2; Aquaporin 2, standard error; Aragonite saturation state; beta carbonic anhydrase; beta carbonic anhydrase, standard error; Bicarbonate ion; BIOACID; Biological Impacts of Ocean Acidification; Ca2+/H+ exchanger 3; Ca2+/H+ exchanger 3, standard error; Calcification/Dissolution; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, particulate, production per cell; Carbon, organic, particulate, production per cell; Carbon/Nitrogen ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Chromista; Containers and aquaria (20-1000 L or 〈 1 m**2); delta carbonic anhydrase; delta carbonic anhydrase, standard error; Difference; Emiliania huxleyi; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); gamma carbonic anhydrase, mean; gamma carbonic anhydrase, standard error; Glutamic acid, proline, alanine rich protein; Glutamic acid, proline, alanine rich protein, standard error; Growth/Morphology; Growth rate; Haptophyta; Irradiance; Laboratory experiment; Laboratory strains; Light:Dark cycle; Low CO2 induced gene; Low CO2 induced gene, standard error; Na+/H+ exchanger 2; Na+/H+ exchanger 2, standard error; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Pelagos; pH; Phytoplankton; Plasma membran type H+ pump; Plasma membran type H+ pump, standard error; Primary production/Photosynthesis; RubisCO; RubisCO, standard error; Salinity; Single species; Species; Temperature, water; Treatment; Vacuolar-type H+ pump; Vacuolar-type H+ pump, standard error; Voltage-gated H+ channel; Voltage-gated H+ channel, standard error
    Type: Dataset
    Format: text/tab-separated-values, 1165 data points
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  • 25
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    Trichodesmium's strategies to alleviate phosphorus limitation in the future acidified oceans (2014)
    PANGAEA
    In:  Supplement to: Spungin, D; Berman-Frank, I; Levitan, Orly (2014): Trichodesmium's strategies to alleviate phosphorus limitation in the future acidified oceans. Environmental Microbiology, 16(6), 1935-1947, https://doi.org/10.1111/1462-2920.12424
    Details
    Publication Date: 2024-05-27
    Description: Global warming may exacerbate inorganic nutrient limitation, including phosphorus (P), in the surface-waters of tropical oceans that are home to extensive blooms of the marine diazotrophic cyanobacterium, Trichodesmium. We examined the combined effects of P limitation and pCO2, forecast under ocean acidification scenarios, on Trichodesmium erythraeum IMS101 cultures. We measured nitrogen acquisition, glutamine synthetase activity, C uptake rates, intracellular Adenosine Triphosphate (ATP) concentration and the pool sizes of related key proteins. Here, we present data supporting the idea that cellular energy re-allocation enables the higher growth and N2 fixation rates detected in Trichodesmium cultured under high pCO2. This is reflected in altered protein abundance and metabolic pools. Also modified are particulate organic carbon and nitrogen production rates, enzymatic activities, and cellular ATP concentrations. We suggest that adjusting these cellular pathways to changing environmental conditions enables Trichodesmium to compensate for low P availability and to thrive in acidified oceans. Moreover, elevated pCO2 could provide Trichodesmium with a competitive dominance that would extend its niche, particularly in P-limited regions of the tropical and subtropical oceans.
    Keywords: Adenosine 5-Triphosphate, per cell; Adenosine 5-Triphosphate, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bacteria; Bicarbonate ion; 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, production per cell; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbon/Phosphorus ratio; Carbon/Phosphorus ratio, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carbon uptake rate, standard deviation; Carbon uptake rate per cell; CF1 subunit of ATP synthase protein; CF1 subunit of ATP synthase protein, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per cell; Cyanobacteria; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); GlnA subunit of Gln synthetase; GlnA subunit of Gln synthetase, standard deviation; Glutamine synthetase biosynthetic activity, standard deviation; Glutamine synthetase biosynthetic activity per cell; Glutamine synthetase transferase/biosynthetic activity ratio; Glutamine synthetase transferase/biosynthetic activity ratio, standard deviation; Growth rate; Growth rate, standard deviation; Incubation duration; Iron protein of nitrogenase; Iron protein of nitrogenase, standard deviation; Laboratory experiment; Laboratory strains; Length; Length, standard deviation; Macro-nutrients; Nitrogen/Phosphorus ratio; Nitrogen/Phosphorus ratio, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, per cell; Particulate organic carbon, production, standard deviation; Particulate organic carbon content per cell, standard deviation; Particulate organic nitrogen, standard deviation; Particulate organic nitrogen per cell; Particulate organic nitrogen production, standard deviation; Particulate organic phosphorus, standard deviation; Particulate organic phosphorus per cell; Pelagos; pH; pH, standard deviation; Phosphate; Photosynthetic protein, PsbA, standard deviation; Photosynthetic protein, PsbC; Photosynthetic protein, PsbC, standard deviation; Photosynthetic protein PsbA; Photosynthetic protein Rubisco; Photosynthetic protein Rubisco, standard deviation; Phytoplankton; Primary production/Photosynthesis; Production of particulate organic nitrogen; Salinity; Single species; Species; Temperature, water; Trichodesmium erythraeum
    Type: Dataset
    Format: text/tab-separated-values, 1003 data points
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  • 26
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    Influence of temperature and CO2 on the strontium and magnesium composition of coccolithophore calcite (2014)
    PANGAEA
    In:  Supplement to: Müller, Marius N; Lebrato, Mario; Riebesell, Ulf; Barcelos e Ramos, Joana; Schulz, Kai Georg; Blanco-Ameijeiras, S; Sett, Scarlett; Eisenhauer, Anton; Stoll, Heather M (2014): Influence of temperature and CO2 on the strontium and magnesium composition of coccolithophore calcite. Biogeosciences, 11(4), 1065-1075, https://doi.org/10.5194/bg-11-1065-2014
    Details
    Publication Date: 2024-05-27
    Description: Marine calcareous sediments provide a fundamental basis for palaeoceanographic studies aiming to reconstruct past oceanic conditions and understand key biogeochemical element cycles. Calcifying unicellular phytoplankton (coccolithophores) are a major contributor to both carbon and calcium cycling by photosynthesis and the production of calcite (coccoliths) in the euphotic zone, and the subsequent long-term deposition and burial into marine sediments. Here we present data from controlled laboratory experiments on four coccolithophore species and elucidate the relation between the divalent cation (Sr, Mg and Ca) partitioning in coccoliths and cellular physiology (growth, calcification and photosynthesis). Coccolithophores were cultured under different seawater temperature and carbonate chemistry conditions. The partition coefficient of strontium (DSr) was positively correlated with both carbon dioxide (pCO2) and temperature but displayed no coherent relation to particulate organic and inorganic carbon production rates. Furthermore, DSr correlated positively with cellular growth rates when driven by temperature but no correlation was present when changes in growth rates were pCO2-induced. Our results demonstrate the complex interaction between environmental forcing and physiological control on the strontium partitioning in coccolithophore calcite and challenge interpretations of the coccolith Sr / Ca ratio from high-pCO2 environments (e.g. Palaeocene-Eocene thermal maximum). The partition coefficient of magnesium (DMg) displayed species-specific differences and elevated values under nutrient limitation. No conclusive correlation between coccolith DMg and temperature was observed but pCO2 induced a rising trend in coccolith DMg. Interestingly, the best correlation was found between coccolith DMg and chlorophyll a production, suggesting that chlorophyll a and calcite associated Mg originate from the same intracellular pool. These and previous findings indicate that Mg is transported into the cell and to the site of calcification via different pathways than Ca and Sr. Consequently, the coccolith Mg / Ca ratio should be decoupled from the seawater Mg / Ca ratio. This study gives an extended insight into the driving factors influencing the coccolith Mg / Ca ratio and should be considered for future palaeoproxy calibrations.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcidiscus quadriperforatus; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, inorganic, particulate, production per cell; Carbon, organic, particulate, production per cell; Carbon, organic, particulate/Nitrogen, particulate ratio; Carbon, organic, particulate/Nitrogen, particulate ratio, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyll a, production, standard deviation; Chlorophyll a production per cell; Chromista; Coccolithus braarudii; Coulometric titration; Emiliania huxleyi; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gephyrocapsa oceanica; Growth rate; Growth rate, standard deviation; Haptophyta; Iron/Calcium ratio; Irradiance; Laboratory experiment; Laboratory strains; Light:Dark cycle; Magnesium/Calcium ratio; Magnesium/Calcium ratio, standard deviation; Magnesium distribution coefficient; Nitrogen, total, particulate, production per cell; Nitrogen, total, particulate production, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon, production, standard deviation; Particulate inorganic carbon/particulate organic carbon ratio; Particulate inorganic carbon/particulate organic carbon ratio, standard deviation; Particulate organic carbon, production, standard deviation; Pelagos; pH; pH, standard deviation; Phosphorus/Calcium ratio; Phytoplankton; Potentiometric titration; Salinity; Single species; Species; Strontium, partition coefficient; Strontium/Calcium ratio; Strontium/Calcium ratio, standard deviation; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 2247 data points
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  • 27
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    Pollen and spore counts of sediment core GeoB12624 (2015)
    PANGAEA
    In:  Supplement to: Bouimetarhan, Ilham; Dupont, Lydie M; Kuhlmann, Holger; Pätzold, Jürgen; Prange, Matthias; Schefuß, Enno; Zonneveld, Karin A F (2015): Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania). Climate of the Past, 11(5), 751-764, https://doi.org/10.5194/cp-11-751-2015
    Details
    Publication Date: 2024-05-27
    Description: In tropical eastern Africa, vegetation distribution is largely controlled by regional hydrology, which has varied over the past 20 000 years. Therefore, accurate reconstructions of past vegetation and hydrological changes are crucial for a better understanding of climate variability in the tropical southeastern African region. We present high-resolution pollen records from a marine sediment core recovered offshore of the Rufiji River delta. Our data document significant shifts in pollen assemblages during the last deglaciation, identifying, through changes in both upland and lowland vegetation, specific responses of plant communities to atmospheric (precipitation) and coastal (coastal dynamics and sea-level changes) alterations. Specifically, arid conditions reflected by a maximum pollen representation of dry and open vegetation occurred during the Northern Hemisphere cold Heinrich event 1 (H1), suggesting that the expansion of drier upland vegetation was synchronous with cold Northern Hemisphere conditions. This arid period is followed by an interval in which forest and humid woodlands expanded, indicating a hydrologic shift towards more humid conditions. Droughts during H1 and the shift to humid conditions around 14.8 kyr BP in the uplands are consistent with latitudinal shifts of the intertropical convergence zone (ITCZ) driven by high-latitude Northern Hemisphere climatic fluctuations. Additionally, our results show that the lowland vegetation, consisting of well-developed salt marshes and mangroves in a successional pattern typical for vegetation occurring in intertidal habitats, has responded mainly to local coastal dynamics related to marine inundation frequencies and soil salinity in the Rufiji Delta as well as to the local moisture availability. Lowland vegetation shows a substantial expansion of mangrove trees after ~ 14.8 kyr BP, suggesting an increased moisture availability and river runoff in the coastal area. The results of this study highlight the decoupled climatic and environmental processes to which the vegetation in the uplands and the Rufiji Delta has responded during the last deglaciation.
    Keywords: Acacia; AGE; Alchornea; Algae; Amaranthaceae/Chenopodiaceae; Area South of Mafia Island; Artemisia; Asteroideae; Borreria; Boscia-type; Butyrospermum; Caryophyllaceae; Cassia-type; Celtis; Center for Marine Environmental Sciences; Cleome; Combretaceae; Counting, palynology; Cyperaceae; DEPTH, sediment/rock; Euphorbia-type; Galium; GeoB12624-1; Gramineae; Gravity corer (Kiel type); Hymenocardia; Indigofera; Isoberlinia; Lycopodium spores added; Lycopodium spores counted; M75/2; M75/2_115-1; MARUM; Meteor (1986); Mimosa-type; Olea; Phyllanthus; Piliostigma; Plantago; Podocarpus; Pollen, total; Psydrax-type subcordata; Pterocarpus-type; Rhizophora; Rhus-type; SL; Spores; Stereospermum-type; Tamarindus-type indica; Typha; Uapaca; Vernonia-type; Ziziphus
    Type: Dataset
    Format: text/tab-separated-values, 1621 data points
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  • 28
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    Temperature modulates coccolithophorid sensitivity of growth, photosynthesis and calcification to increasing seawater pCO2 (2014)
    PANGAEA
    In:  Supplement to: Sett, Scarlett; Bach, Lennart Thomas; Schulz, Kai Georg; Koch-Klavsen, Signe; Lebrato, Mario; Riebesell, Ulf (2014): Temperature Modulates Coccolithophorid Sensitivity of Growth, Photosynthesis and Calcification to Increasing Seawater pCO2. PLoS ONE, 9(2), e88308, https://doi.org/10.1371/journal.pone.0088308
    Details
    Publication Date: 2024-05-27
    Description: Increasing atmospheric CO2 concentrations are expected to impact pelagic ecosystem functioning in the near future by driving ocean warming and acidification. While numerous studies have investigated impacts of rising temperature and seawater acidification on planktonic organisms separately, little is presently known on their combined effects. To test for possible synergistic effects we exposed two coccolithophore species, Emiliania huxleyi and Gephyrocapsa oceanica, to a CO2 gradient ranging from ~0.5-250 µmol/kg (i.e. ~20-6000 µatm pCO2) at three different temperatures (i.e. 10, 15, 20°C for E. huxleyi and 15, 20, 25°C for G. oceanica). Both species showed CO2-dependent optimum-curve responses for growth, photosynthesis and calcification rates at all temperatures. Increased temperature generally enhanced growth and production rates and modified sensitivities of metabolic processes to increasing CO2. CO2 optimum concentrations for growth, calcification, and organic carbon fixation rates were only marginally influenced from low to intermediate temperatures. However, there was a clear optimum shift towards higher CO2 concentrations from intermediate to high temperatures in both species. Our results demonstrate that the CO2 concentration where optimum growth, calcification and carbon fixation rates occur is modulated by temperature. Thus, the response of a coccolithophore strain to ocean acidification at a given temperature can be negative, neutral or positive depending on that strain's temperature optimum. This emphasizes that the cellular responses of coccolithophores to ocean acidification can only be judged accurately when interpreted in the proper eco-physiological context of a given strain or species. Addressing the synergistic effects of changing carbonate chemistry and temperature is an essential step when assessing the success of coccolithophores in the future ocean.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcite saturation state; Calculated; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, particulate, production per cell; Carbon, organic, particulate, production per cell; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Emiliania huxleyi; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gephyrocapsa oceanica; Growth/Morphology; Growth rate; Haptophyta; Laboratory experiment; Laboratory strains; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Pelagos; pH; Phytoplankton; Potentiometric titration; Primary production/Photosynthesis; Salinity; Single species; Species; Temperature; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1958 data points
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  • 29
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    Impact of elevated pCO2 on paralytic shellfish poisoning toxin content and composition in Alexandrium tamarense (2014)
    PANGAEA
    In:  Supplement to: Van de Waal, Dedmer B; Eberlein, Tim; John, Uwe; Wohlrab, Sylke; Rost, Björn (2014): Impact of elevated pCO2 on paralytic shellfish poisoning toxin content and composition in Alexandrium tamarense. Toxicon, 78, 58-67, https://doi.org/10.1016/j.toxicon.2013.11.011
    Details
    Publication Date: 2024-05-27
    Description: Ocean acidification is considered a major threat to marine ecosystems and may particularly affect primary producers. Here we investigated the impact of elevated pCO2 on paralytic shellfish poisoning toxin (PST) content and composition in two strains of Alexandrium tamarense, Alex5 and Alex2. Experiments were carried out as dilute batch to keep carbonate chemistry unaltered over time. We observed only minor changes with respect to growth and elemental composition in response to elevated pCO2. For both strains, the cellular PST content, and in particular the associated cellular toxicity, was lower in the high CO2 treatments. In addition, Alex5 showed a shift in its PST composition from a nonsulfated analogue towards less toxic sulfated analogues with increasing pCO2. Transcriptomic analyses suggest that the ability of A. tamarense to maintain cellular homeostasis is predominantly regulated on the post-translational level rather than on the transcriptomic level. Furthermore, genes associated to secondary metabolite and amino acid metabolism in Alex5 were down-regulated in the high CO2 treatment, which may explain the lower PST content. Elevated pCO2 also induced up-regulation of a putative sulfotransferase sxtN homologue and a substantial down-regulation of several sulfatases. Such changes in sulfur metabolism may explain the shift in PST composition towards more sulfated analogues. All in all, our results indicate that elevated pCO2 will have minor consequences for growth and elemental composition, but may potentially reduce the cellular toxicity of A. tamarense.
    Keywords: Alexandrium tamarense; Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; 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, 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; Category; Cell density; Cellular paralytic shellfish toxin, total; Cellular paralytic shellfish toxin, total, standard deviation; Chromista; Coulometric titration; Di-sulfated toxins C1+C2; Di-sulfated toxins C1+C2, standard deviation; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gene abundance; Gene expression (incl. proteomics); Gonyautoxins 1/4; Gonyautoxins 1/4, standard deviation; Gonyautoxins 2/3; Gonyautoxins 2/3, standard deviation; Growth/Morphology; Growth rate; Growth rate, standard deviation; Immunology/Self-protection; Laboratory experiment; Laboratory strains; Myzozoa; Neosaxitoxin; Neosaxitoxin, standard deviation; Neurotoxin saxitoxin; Neurotoxin saxitoxin, standard deviation; Nitrogen, organic, particulate, per cell; Nitrogen, organic, particulate, standard deviation; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; 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; Pelagos; pH; pH, standard deviation; Phosphate; Phytoplankton; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Salinity; Single species; Species; Strain; Table; Temperature, water; Time in days; Toxicity, cellular; Toxicity, cellular, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 6500 data points
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  • 30
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    Adaptation of a globally important coccolithophore to ocean warming and acidification (2014)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; BIOACID; Biological Impacts of Ocean Acidification; 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, particulate, per cell; Carbon, inorganic, particulate, production per cell; Carbon, organic, particulate, per cell; Carbon, organic, particulate, production per cell; Carbon/Nitrogen ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell biovolume; Cell size; Chromista; Coulometric titration; Emiliania huxleyi; Experiment day; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Haptophyta; Laboratory experiment; Laboratory strains; Nitrogen, organic, particulate, per cell; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Pelagos; pH; Phytoplankton; Potentiometric titration; Replicate; Salinity; Single species; Species; Temperature; Temperature, water; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 20349 data points
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  • 31
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    Effects of increasing seawater carbon dioxide concentrations on chain formation of the diatom Asterionellopsis glacialis (2014)
    PANGAEA
    In:  Supplement to: Barcelos e Ramos, Joana; Schulz, Kai Georg; Brownlee, Colin; Sett, Scarlett; Azevedo, Eduardo Brito (2014): Effects of Increasing Seawater Carbon Dioxide Concentrations on Chain Formation of the Diatom Asterionellopsis glacialis. PLoS ONE, 9(3), e90749, https://doi.org/10.1371/journal.pone.0090749
    Details
    Publication Date: 2024-05-27
    Description: Diatoms can occur as single cells or as chain-forming aggregates. These two strategies affect buoyancy, predator evasion, light absorption and nutrient uptake. Adjacent cells in chains establish connections through various processes that determine strength and flexibility of the bonds, and at distinct cellular locations defining colony structure. Chain length has been found to vary with temperature and nutrient availability as well as being positively correlated with growth rate. However, the potential effect of enhanced carbon dioxide (CO2) concentrations and consequent changes in seawater carbonate chemistry on chain formation is virtually unknown. Here we report on experiments with semi-continuous cultures of the freshly isolated diatom Asterionellopsis glacialis grown under increasing CO2 levels ranging from 320 to 3400 µatm. We show that the number of cells comprising a chain, and therefore chain length, increases with rising CO2 concentrations. We also demonstrate that while cell division rate changes with CO2 concentrations, carbon, nitrogen and phosphorus cellular quotas vary proportionally, evident by unchanged organic matter ratios. Finally, beyond the optimum CO2 concentration for growth, carbon allocation changes from cellular storage to increased exudation of dissolved organic carbon. The observed structural adjustment in colony size could enable growth at high CO2 levels, since longer, spiral-shaped chains are likely to create microclimates with higher pH during the light period. Moreover increased chain length of Asterionellopsis glacialis may influence buoyancy and, consequently, affect competitive fitness as well as sinking rates. This would potentially impact the delicate balance between the microbial loop and export of organic matter, with consequences for atmospheric carbon dioxide.
    Keywords: Alkalinity, total; Aragonite saturation state; Asterionellopsis glacialis; Bicarbonate ion; 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, organic, dissolved exudation, per cell; Carbon, organic, particulate, production per cell; Carbon/Nitrogen ratio; Carbon/Phosphorus ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Laboratory experiment; Nitrogen/Phosphorus ratio; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Open ocean; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, per cell; Particulate organic nitrogen per cell; Particulate organic phosphorus per cell; Pelagos; Percentage; pH; Phosphorus, organic, particulate, production per cell; Phytoplankton; Potentiometric; Potentiometric titration; Production of particulate organic nitrogen; Salinity; Single species; Species; Temperate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 616 data points
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  • 32
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    Strong shift from HCO3- to CO2 uptake in Emiliania huxleyi with acidification: new approach unravels acclimation versus short-term pH effects (2014)
    PANGAEA
    In:  Supplement to: Kottmeier, Dorothee; Rokitta, Sebastian D; Tortell, Philippe Daniel; Rost, Björn (2014): Strong shift from HCO3- to CO2 uptake in Emiliania huxleyi with acidification: new approach unravels acclimation versus short-term pH effects. Photosynthesis Research, 121(2-3), 265-275, https://doi.org/10.1007/s11120-014-9984-9
    Details
    Publication Date: 2024-05-27
    Description: Effects of ocean acidification on Emiliania huxleyi strain RCC 1216 (calcifying, diploid life-cycle stage) and RCC 1217 (non-calcifying, haploid life-cycle stage) were investigated by measuring growth, elemental composition, and production rates under different pCO2 levels (380 and 950 µatm). In these differently acclimated cells, the photosynthetic carbon source was assessed by a (14)C disequilibrium assay, conducted over a range of ecologically relevant pH values (7.9-8.7). In agreement with previous studies, we observed decreased calcification and stimulated biomass production in diploid cells under high pCO2, but no CO2-dependent changes in biomass production for haploid cells. In both life-cycle stages, the relative contributions of CO2 and HCO3 (-) uptake depended strongly on the assay pH. At pH values =〈 8.1, cells preferentially used CO2 (〉= 90 % CO2), whereas at pH values 〉= 8.3, cells progressively increased the fraction of HCO3 (-) uptake (~45 % CO2 at pH 8.7 in diploid cells; ~55 % CO2 at pH 8.5 in haploid cells). In contrast to the short-term effect of the assay pH, the pCO2 acclimation history had no significant effect on the carbon uptake behavior. A numerical sensitivity study confirmed that the pH-modification in the (14)C disequilibrium method yields reliable results, provided that model parameters (e.g., pH, temperature) are kept within typical measurement uncertainties. Our results demonstrate a high plasticity of E. huxleyi to rapidly adjust carbon acquisition to the external carbon supply and/or pH, and provide an explanation for the paradoxical observation of high CO2 sensitivity despite the apparently high HCO3 (-) usage seen in previous studies.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; 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, organic, particulate, per cell; Carbon, total, particulate, per cell; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon dioxide usage fraction; Chlorophyll a per cell; Chromista; Emiliania huxleyi; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Haptophyta; Irradiance; Laboratory experiment; Laboratory strains; Light:Dark cycle; Nitrogen, organic, particulate, per cell; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phosphate; Phytoplankton; Potentiometric; Potentiometric titration; Pressure, water; Salinity; Silicate; Single species; Species; Strain; Temperature, water; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 548 data points
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  • 33
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    Comparative responses of two dominant Antarctic phytoplankton taxa to interactions between ocean acidification, warming, irradiance, and iron availability (2014)
    PANGAEA
    In:  Supplement to: Xu, Kai; Fu, Feixue; Hutchins, David A (2014): Comparative responses of two dominant Antarctic phytoplankton taxa to interactions between ocean acidification, warming, irradiance, and iron availability. Limnology and Oceanography, 59(6), 1919-1931, https://doi.org/10.4319/lo.2014.59.6.1919
    Details
    Publication Date: 2024-05-27
    Description: We investigated the responses of the ecologically dominant Antarctic phytoplankton species Phaeocystis antarctica (a prymnesiophyte) and Fragilariopsis cylindrus (a diatom) to a clustered matrix of three global change variables (CO2, mixed-layer depth, and temperature) under both iron (Fe)-replete and Fe-limited conditions based roughly on the Intergovernmental Panel on Climate Change (IPCC) A2 scenario: (1) Current conditions, 39 Pa (380 ppmv) CO2, 50 µmol photons/m**2/s light, and 2°C; (2) Year 2060, 61 Pa (600 ppmv) CO2, 100 µmol photons/m**2/s light, and 4°C; (3) Year 2100, 81 Pa (800 ppmv) CO2, 150 µmol photons/m**2/s light, and 6°C. The combined interactive effects of these global change variables and changing Fe availability on growth, primary production, and cell morphology are species specific. A competition experiment suggested that future conditions could lead to a shift away from P. antarctica and toward diatoms such as F. cylindrus. Along with decreases in diatom cell size and shifts from prymnesiophyte colonies to single cells under the future scenario, this could potentially lead to decreased carbon export to the deep ocean. Fe : C uptake ratios of both species increased under future conditions, suggesting phytoplankton of the Southern Ocean will increase their Fe requirements relative to carbon fixation. The interactive effects of Fe, light, CO2, and temperature on Antarctic phytoplankton need to be considered when predicting the future responses of biology and biogeochemistry in this region.
    Keywords: Abundance; Abundance, standard deviation; Alkalinity, total; Antarctic; Aragonite saturation state; Bicarbonate ion; Biogenic silica, per cell; Biogenic silica, standard deviation; Biogenic silica production, standard deviation; Biogenic silica production per cell; 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, production per cell; Carbon, organic, particulate, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbon/Phosphorus ratio; Carbon/Phosphorus ratio, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell biovolume; Cell counts, percent of total; Cell counts, standard deviation; Cell density, standard deviation; Cell density per colony; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chromista; Coulometric titration; Diameter; Duration, number of days; Fragilariopsis cylindrus; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Haptophyta; Height; Iron/Carbon uptake ratio; Iron/Carbon uptake ratio, standard deviation; Iron uptake rate, per cell; Iron uptake rate, standard deviation; Laboratory experiment; Laboratory strains; Light; Measured; Micro-nutrients; Nitrogen, organic, particulate, standard deviation; Nitrogen/Phosphorus ratio; Nitrogen/Phosphorus ratio, standard deviation; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon, per cell; Particulate organic carbon, production, standard deviation; Particulate organic nitrogen per cell; Particulate organic nitrogen production, standard deviation; Particulate organic phosphorus, standard deviation; Particulate organic phosphorus per cell; Pelagos; pH; pH, standard deviation; Phaeocystis antarctica; Phosphorus, organic, particulate, production per cell; Phytoplankton; Potentiometric; Primary production/Photosynthesis; Production of particulate organic nitrogen; Production of particulate organic phosphorus, standard deviation; Salinity; Silicon/Carbon, molar ratio; Silicon/Carbon ratio, standard deviation; Silicon/Nitrogen, molar ratio; Silicon/Nitrogen ratio, standard deviation; Silicon/Phosphorus ratio; Silicon/Phosphorus ratio, standard deviation; Species; Species interaction; Temperature; Temperature, water; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 32742 data points
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  • 34
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    Pollen and spores of ODP Hole 175-1081A, Miocene-Pliocene, Walvis Ridge (2015)
    PANGAEA
    In:  Supplement to: Hötzel, Sebastian; Dupont, Lydie M; Wefer, Gerold (2015): Miocene-Pliocene Vegetation change in south-western Africa (ODP Site 1081, offshore Namibia). Palaeogeography, Palaeoclimatology, Palaeoecology, 423, 102-108, https://doi.org/10.1016/j.palaeo.2015.02.002
    Details
    Publication Date: 2024-05-27
    Description: Aridification is an important component of Late Neogene climate change in south-western Africa probably caused by modifications in the atmospheric circulation in relation to the initiation and intensification of the Benguela Upwelling System due to globally steepening of the meridional pressure gradient. Intensification of the meridional pressure gradient influenced the climate intensively which had then an impact on the vegetation. However, vegetation changes of south-western Africa from the Miocene to Pliocene have not yet been reported and only indirectly investigated by sedimentological data. Here, we present a pollen record of marine ODP Site 1081 retrieved 160 km offshore Namibia covering the time between 9 and 2.7 Ma. Using an endmember unmixing model we distinguished three vegetation phases: a relative wet phase, during the Tortonian, showing higher representations of Cyperaceae, a transition phase during the Messinian, when especially grasses expanded, and a dry one covering the Pliocene with a strong representation of desert and semi-desert plants. The three phases indicate ongoing aridification probably caused by intensified meridional pressure gradients. Additionally, aquatic vegetation indicators appear in our pollen record from around 5 Ma on, which we attribute to a relocation of the lower course of the Cunene River to its modern outlet in the Atlantic Ocean. Redirection of the Cunene River toward the Atlantic would have deprived the palaeolake Cunene of an important source of fresh-water ultimately resulting in desiccation of the lake and the formation of the Etosha Pan.
    Keywords: 175-1081A; Abutilon; Acacia; Acanthaceae; Adenium; AGE; Aizoaceae; Amanoa; Amaranthaceae/Chenopodiaceae; Aniseia; Arecaceae; Artemisia-type; Asteraceae tubiliflorae; Asystasia gangetica; Barleria; Basilicum; Benguela Current, South Atlantic Ocean; Berkheya-type; Blepharis; Borassus-type; Brachystegia; Cassia-type; Casuarina; Celtis; Cephalaria; Clausena; Cliffortia; Coccinia; Colophospermum mopane; Combretaceae; Commiphora; Cotula-type; Counting, palynology; Cyperaceae; Delonix; DEPTH, sediment/rock; Detarium; Dichrostachys cinerea; Dicoma-type; Diodia-type; Dombeya-type; DRILL; Drilling/drill rig; Ecbolium; Ephedra; Ericaceae; Euphorbia; Euphorbiaceae undifferentiated; Evolvulus-type; Gardenia; Gazania-type; Gerbera-type; Grewia; Gunnera perpensa; Heritiera-type; Hevea; Hildebrandtia; Hypoestes type; Ipomoea; Isoberlinia-type; Jasminum; Jatropha; Joides Resolution; Justicia-type; Kedrostis; Leg175; Luffa; Lycopodium; Mallotus; Malvaceae (Africa); Marker, added; Marker, found; Meliaceae; Merremia; Mesembryanthenum-type; Mimosaceae undifferentiated; Mohria; Monsonia; Myrica; Myrsine africana; Neurada/Grielum; Nyctaginaceae; Nymphaea; Ocean Drilling Program; ODP; Oleaceae; Osmunda-type; Passerina; Pavonia-type; Pelargonium; Pentas; Pentzia-type; Peristrophe; Petalidium; Phaeoceros; Phyllanthus; Picris-type; Piliostigma; Poaceae; Podocarpus; Polygala; Polygonum; Polypodiaceae; Proteaceae; Pteris; Rapanea; Restionaceae; Riccia; Rothmannia; Rubiaceae tetrade; Rubiaceae undifferentiated; Ruellia; Sample code/label; Selaginella; Senecio-type; Sesamum; Sorindeia-type; Spathodea; Spores, varia; Sporomorphes, total; Sterculia-type; Stoebe-type; Tetrorchidium; Thymelaeaceae; Tiliaceae; Tribulus; Trichotomosulcate reticulate; Typha; undetermined; Vernonia-type; Vigna; Volume; Welwitschia; Zanthoxylum
    Type: Dataset
    Format: text/tab-separated-values, 8946 data points
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  • 35
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    Negative effects of ocean acidification on calcification vary within the coccolithophore genus Calcidiscus (2015)
    PANGAEA
    In:  Supplement to: Diner, Rachel E; Benner, Ina; Passow, Uta; Komada, Tomoko; Carpenter, E J; Stillman, Jonathon H (2015): Negative effects of ocean acidification on calcification vary within the coccolithophore genus Calcidiscus. Marine Biology, 162(6), 1287-1305, https://doi.org/10.1007/s00227-015-2669-x
    Details
    Publication Date: 2024-05-27
    Description: A large percentage of CO2 emitted into the atmosphere is absorbed by the oceans, causing chemical changes in surface waters known as ocean acidification (OA). Despite the high interest and increased pace of OA research to understand the effects of OA on marine organisms, many ecologically important organisms remain unstudied. Calcidiscus is a heavily calcified coccolithophore genus that is widespread and genetically and morphologically diverse. It contributes substantially to global calcium carbonate production, organic carbon production, oceanic carbon burial, and ocean-atmosphere CO2 exchange. Despite the importance of this genus, relatively little work has examined its responses to OA. We examined changes in growth, morphology, and carbon allocation in multiple strains of Calcidiscus leptoporus in response to ocean acidification. We also, for the first time, examined the OA response of Calcidiscus quadriperforatus, a larger and more heavily calcified Calcidiscus congener. All Calcidiscus coccolithophores responded negatively to OA with impaired coccolith morphology and a decreased ratio of particulate inorganic to organic carbon (PIC:POC). However, strains responded variably; C. quadriperforatus showed the most sensitivity, while the most lightly calcified strain of C. leptoporus showed little response to OA. Our findings suggest that calcium carbonate production relative to organic carbon production by Calcidiscus coccolithophores may decrease in future oceans and that Calcidiscus distributions may shift if more resilient strains and species become dominant in assemblages. This study demonstrates that variable responses to OA may be strain or species specific in a way that is closely linked to physiological traits, such as cellular calcite quota.
    Keywords: Alkalinity, total; Alkalinity, total, standard error; Aragonite saturation state; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcidiscus leptoporus; Calcidiscus quadriperforatus; Calcification/Dissolution; Calcite saturation state; Calculated; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard error; Carbon, inorganic, particulate, per cell; Carbon, inorganic, particulate, production per cell; Carbon, organic, particulate, per cell; Carbon, organic, particulate, production per cell; Carbon, total, particulate, per cell; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Change; Change, standard error; Chromista; Coccoliths; Coulometric titration; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Haptophyta; Laboratory experiment; Laboratory strains; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error; Particulate alcian blue-stainable material, per cell; Particulate inorganic carbon/particulate organic carbon ratio; Pelagos; Percentage; Percentage, standard deviation; pH; pH, standard error; Phytoplankton; Potentiometric titration; Primary production/Photosynthesis; Replicate; Salinity; Salinity, standard error; Single species; Species; Strain; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 4298 data points
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  • 36
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    CLAM age model and biomes of sediment core Caco (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Caco; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Pollen, temperate mountain forest; Pollen, tropical forest; Pollen, warm-temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 867 data points
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  • 37
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    CLAM age model and biomes of sediment core Caledonia_Fen (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Caledonia_Fen; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Pollen, savanah; Pollen, warm-temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 3637 data points
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  • 38
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    CLAM age model and biomes of sediment core Carp_Lake (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Carp_Lake; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Pollen, boreal forest; Pollen, temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 1262 data points
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  • 39
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    CLAM age model and biomes of sediment core Colonia (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); Colonia; DEPTH, sediment/rock; Pollen, temperate mountain forest; Pollen, tropical forest; Pollen, warm-temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 1546 data points
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  • 40
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    CLAM age model and biomes of sediment core F2-92-P29 (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; ACER; AGE; DEPTH, sediment/rock; F2-92-P29; PC; Piston corer; Pollen, temperate forest; Pollen, warm-temperate forest; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 156 data points
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  • 41
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    CLAM age model and biomes of sediment core EW9504-17PC (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; ACER; AGE; DEPTH, sediment/rock; EW9504-17PC; PC; Piston corer; Pollen, boreal forest; Pollen, temperate forest; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 900 data points
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  • 42
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    CLAM age model and biomes of sediment core Fuquene (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Fuquene; Pollen, grassland; Pollen, warm-temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 626 data points
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  • 43
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    CLAM age model and biomes of sediment core FURAMOOS (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; DRILL; Drilling/drill rig; FURAMOOS; Füramoos; Füramoos, Germany; Pollen, temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 387 data points
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  • 44
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    CLAM age model and biomes of sediment core GeoB1023-5 (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Angola Basin; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; GeoB1023-5; Gravity corer (Kiel type); M6/6; Meteor (1986); Pollen, temperate mountain forest; Pollen, tropical forest; Pollen, warm-temperate forest; Sample ID; SL; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 804 data points
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  • 45
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    CLAM age model and biomes of sediment core GeoB3910-2 (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; GeoB3910-2; Gravity corer (Kiel type); M34/4; Meteor (1986); Northeast Brasilian Margin; Pollen, temperate mountain forest; Pollen, tropical forest; Pollen, warm-temperate forest; Sample ID; SL; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 315 data points
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  • 46
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    CLAM age model and biomes of sediment core Ioannina (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DACH; Dachnowski corer; DEPTH, sediment/rock; IOANNINA; Ioannina I, Greece; Pollen, temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 2037 data points
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  • 47
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    CLAM age model and biomes of sediment core Kamiyoshi_Basin (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Kamiyoshi_Basin; KY01; Pollen, boreal forest; Pollen, grassland; Pollen, subtropical forest; Pollen, temperate forest; Pollen, warm-temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 689 data points
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  • 48
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    CLAM age model and biomes of sediment core Khoe (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Khoe; Pollen, boreal forest; Pollen, grassland; Pollen, subtropical forest; Pollen, temperate forest; Pollen, warm-temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 551 data points
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  • 49
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    CLAM age model and biomes of sediment core Kenbuchi_Basin (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Kenbuchi_Basin; Pollen, boreal forest; Pollen, grassland; Pollen, subtropical forest; Pollen, temperate forest; Pollen, warm-temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 793 data points
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  • 50
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    CLAM age model and biomes of sediment core Kohuora (2017)
    PANGAEA
    Details
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; AGE; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Kohuora; Pollen, temperate forest; Pollen, warm-temperate forest; Sample ID; Type of age model
    Type: Dataset
    Format: text/tab-separated-values, 804 data points
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