cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.758073
title: Incorporation of Mg and Sr in calcite of cultured benthic foraminifera (Heterostegina depressa and Ammonia tepida) and seawater carbonate chemistry, 2010

description: We investigated the effect of the calcium concentration in seawater and thereby the calcite saturation state (omega) on the magnesium and strontium incorporation into benthic foraminiferal calcite under laboratory conditions. For this purpose individuals of the shallow-water species Heterostegina depressa (precipitating high-Mg calcite, symbiont-bearing) and Ammonia tepida (low-Mg calcite, symbiont-barren) were cultured in media under a range of [Ca2+], but similar Mg/Ca ratios. Trace element/Ca ratios of newly formed calcite were analysed with Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) and normalized to the seawater elemental composition using the equation DTE=(TE/Cacalcite)/(TE/Caseawater). The culturing study shows that DMg of A. tepida significantly decreases with increasing omega at a gradient of -4.3x10-5 per omega unit. The DSr value of A. tepida does not change with omega, suggesting that fossil Sr/Ca in this species may be a potential tool to reconstruct past variations in seawater Sr/Ca. Conversely, DMg of H. depressa shows only a minor decrease with increasing omega, while DSr increases considerably with omega at a gradient of 0.009 per omega unit. The different responses to seawater chemistry of the two species may be explained by a difference in the calcification pathway that is, at the same time, responsible for the variation in the total Mg incorporation between the two species. Since the Mg/Ca ratio in H. depressa is 50-100 times higher than that of A. tepida, it is suggested that the latter exhibits a mechanism that decreases the Mg/Ca ratio of the calcification fluid, while the high-Mg calcite forming species may not have this physiological tool. If the dependency of Mg incorporation on seawater [Ca2+] is also valid for deep-sea benthic foraminifera typically used for paleostudies, the higher Ca concentrations in the past may potentially bias temperature reconstructions to a considerable degree. For instance, 25 Myr ago Mg/Ca ratios in A. tepida would have been 0.2 mmol/mol lower than today, due to the 1.5 times higher [Ca2+] of seawater, which in turn would lead to a temperature underestimation of more than 2 °C.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).
description: Supplement to: Raitzsch, Markus; Dueñas-Bohórquez, Adriana; Reichart, Gert-Jan; de Nooijer, Lennart Jan; Bickert, Torsten (2010): Incorporation of Mg and Sr in calcite of cultured benthic foraminifera: impact of calcium concentration and associated saturation state. Biogeosciences, 7(3), 869-881
DOI: 10.1594/pangaea.875147
title: Seawater carbonate chemistry and data of element incorporation in hyaline and porcelaneous foraminifera in laboratory experiment

description: In this study we analyzed the impact of seawater carbonate chemistry on the incorporation of elements in both hyaline and porcelaneous larger benthic foraminifera. We observed a higher incorporation of Zn and Ba when pCO2 increases from 350 to 1200?ppm. Modeling the activity of free ions as a function of pCO2 shows that speciation of some elements (like Zn and Ba) is mainly influenced by the formation of carbonate complexes in seawater. Hence, differences in foraminiferal uptake of these might be related primarily by the speciation of these elements in seawater. We investigated differences in trends in element incorporation between hyaline (perforate) and porcelaneous (imperforate) foraminifera in order to unravel processes involved in element uptake and subsequent foraminiferal calcification. In hyaline foraminifera we observed a correlation of element incorporation of different elements between species, reflected by a general higher incorporation of elements in species with higher Mg content. Between porcelaneous species, inter-element differences are much smaller. Besides these contrasting trends in element incorporation, however, similar trends are observed in element incorporation as a function of seawater carbonate chemistry in both hyaline and porcelaneous species. This suggests similar mechanisms responsible for the transportation of ions to the site of calcification for these groups of foraminifera, although the contribution of these processes might differ across species.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2017-05-12.
description: Supplement to: van Dijk, Inge; de Nooijer, Lennart Jan; Reichart, Gert-Jan (2017): Trends in element incorporation in hyaline and porcelaneous foraminifera as a function of pCO2. Biogeosciences, 14(3), 497-510
DOI: 10.1594/pangaea.855102
title: (Table 3) Stable carbon isotope and radiocarbon composition of Lena Delta first terrace soil profiles and surface water particulate organic matter (2009–2011)

description: Soil profile samples are given in meters below surface (m b.s.).Before present (BP), i.e., before 1950.Samples were radiocarbon-dated at the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) facility at Woods Hole Oceanographic Institution, USA.
DOI: 10.1594/pangaea.891206
title: Seawater carbonate chemistry and incorporation of Mg, Sr, Ba, U, and B in High-Mg Calcite Benthic Foraminifers

description: Measurement of elemental ratios (E/Ca) have been performed in two symbiont-bearing species of high-Mg calcite benthic foraminifers (hyaline, Baculogypsina sphaerulata and porcelaneous, Amphisorus hemprichii), cultured under five pCO2 levels, representing pre-industrial, modern and three predicted future values. E/Ca ratios were analyzed by Laser Ablation coupled with Inductively Coupled Plasma Mass Spectrometer (LA-ICP-MS). We measured several E/Ca such as Mg/Ca, Sr/Ca, Ba/Ca, U/Ca and B/Ca simultaneously. We observed that high-Mg calcite benthic foraminifers possess higher E/Ca than low-Mg calcite foraminifers, irrespective of their calcification mode (hyaline or porcelaneous). In both modes of calcification, Mg, Sr, Ba, U and B incorporation could be controlled by Rayleigh fractionation. However, more data is needed to validate and quantify the relative importance this process and closely investigate the presence/absence of other mechanism. Therefore, it highlights the need for a multi-elemental approach when looking at trace element incorporation. Finally, no significant relationship was observed between the different ratios and the pCO2 of the water, suggesting that none of the Mg/Ca, Sr/Ca, Ba/Ca, U/Ca and B/Ca is sensitive to bottom water pCO2 or pH in these species.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2018-05-23.
description: Supplement to: Not, C; Thibodeau, B; Yokoyama, Yusuke (2018): Incorporation of Mg, Sr, Ba, U, and B in High-Mg Calcite Benthic Foraminifers Cultured Under Controlled pCO2. Geochemistry, Geophysics, Geosystems, 19(1), 83-98
DOI: 10.1594/pangaea.951205
title: Seawater carbonate chemistry and functional morphology of foraminifera

description: Culturing experiments were performed on sediment samples from the Ythan Estuary, N. E. Scotland, to assess the impacts of ocean acidification on test surface ornamentation in the benthic foraminifer Haynesina germanica. Specimens were cultured for 36 weeks at either 380, 750 or 1000 ppm atmospheric CO2. Analysis of the test surface using SEM imaging reveals sensitivity of functionally important ornamentation associated with feeding to changing seawater CO2 levels. Specimens incubated at high CO2 levels displayed evidence of shell dissolution, a significant reduction and deformation of ornamentation. It is clear that these calcifying organisms are likely to be vulnerable to ocean acidification. A reduction in functionally important ornamentation could lead to a reduction in feeding efficiency with consequent impacts on this organism's survival and fitness.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2022-11-23.
DOI: 10.1594/pangaea.954125
title: Compound-specific delta Deuterium measurements from Lake Uddelermeer (The Netherlands) in 2012
DOI: 10.5281/zenodo.17071842
title: MALDI-MSI Lipid Brain Atlas RAW data (Part 1 of 26) (Part 2 of 26) (Part 3 of 26) (Part 4 of 26) (Part 5 of 26) (Part 6 of 26) (Part 7 of 26) (Part 8 of 26) (Part 9 of 26) (Part 10 of 26) (Part 11 of 26) (Part 12 of 26) (Part 13 of 26) (Part 14 of 26) (Part 15 of 26) (Part 16 of 26) (Part 17 of 26) (Part 18 of 26) (Part 19 of 26) (Part 20 of 26) (Part 21 of 26) (Part 22 of 26) (Part 23 of 26) (Part 24 of 26) (Part 25 of 26) (Part 26 of 26) (Part 1 of 38) (Part 2 of 38) (Part 3 of 38) (Part 4 of 38) (Part 5 of 38) (Part 6 of 38) (Part 7 of 38) (Part 8 of 38) (Part 9 of 38) (Part 10 of 38) (Part 11 of 38) (Part 12 of 38) (Part 13 of 38) (Part 14 of 38) (Part 15 of 38) (Part 16 of 38) (Part 17 of 38) (Part 18 of 38) (Part 19 of 38) (Part 20 of 38) (Part 21 of 38) (Part 22 of 38) (Part 23 of 38) (Part 24 of 38) (Part 25 of 38) (Part 26 of 38) (Part 27 of 38) (Part 28 of 38) (Part 29 of 38) (Part 30 of 38) (Part 31 of 38) (Part 32 of 38)

description: This dataset contains raw MALDI-MSI data (.RAW) and associated metadata files (.UDP). This is one part of a multi-part upload.
DOI: 10.5281/zenodo.17071843
title: MALDI-MSI Lipid Brain Atlas RAW data (Part 1 of 26) (Part 2 of 26) (Part 3 of 26) (Part 4 of 26) (Part 5 of 26) (Part 6 of 26) (Part 7 of 26) (Part 8 of 26) (Part 9 of 26) (Part 10 of 26) (Part 11 of 26) (Part 12 of 26) (Part 13 of 26) (Part 14 of 26) (Part 15 of 26) (Part 16 of 26) (Part 17 of 26) (Part 18 of 26) (Part 19 of 26) (Part 20 of 26) (Part 21 of 26) (Part 22 of 26) (Part 23 of 26) (Part 24 of 26) (Part 25 of 26) (Part 26 of 26) (Part 1 of 38) (Part 2 of 38) (Part 3 of 38) (Part 4 of 38) (Part 5 of 38) (Part 6 of 38) (Part 7 of 38) (Part 8 of 38) (Part 9 of 38) (Part 10 of 38) (Part 11 of 38) (Part 12 of 38) (Part 13 of 38) (Part 14 of 38) (Part 15 of 38) (Part 16 of 38) (Part 17 of 38) (Part 18 of 38) (Part 19 of 38) (Part 20 of 38) (Part 21 of 38) (Part 22 of 38) (Part 23 of 38) (Part 24 of 38) (Part 25 of 38) (Part 26 of 38) (Part 27 of 38) (Part 28 of 38) (Part 29 of 38) (Part 30 of 38) (Part 31 of 38) (Part 32 of 38)

description: This dataset contains raw MALDI-MSI data (.RAW) and associated metadata files (.UDP). This is one part of a multi-part upload.
DOI: 10.1594/pangaea.929866
title: Seawater carbonate chemistry and calcification, respiration, and photosynthesis of the widespread diatom‐bearing LBF Operculina ammonoides

description: Larger benthic foraminifera (LBF) are unicellular eukaryotic calcifying organisms and an important component of tropical and subtropical modern and ancient oceanic ecosystems. They are major calcium carbonate producers and important contributors to primary production due to the photosynthetic activity of their symbiotic algae. Studies investigating the response of LBF to seawater carbonate chemistry changes are therefore essential for understanding the impact of climate changes and ocean acidification (OA) on shallow marine ecosystems. In this study, calcification, respiration, and photosynthesis of the widespread diatom‐bearing LBF Operculina ammonoides were measured in laboratory experiments that included manipulation of carbonate chemistry parameters. pH was altered while keeping dissolved inorganic carbon (DIC) constant, and DIC was altered while keeping pH constant. The results show clear vulnerability of O. ammonoides to low pH and CO32− under constant DIC conditions, and no increased photosynthesis or calcification under high DIC concentrations. Our results call into question previous hypotheses, suggesting that mechanisms such as the degree of cellular control on calcification site pH/DIC and/or enhanced symbiont photosynthesis in response to OA may render the hyaline (perforate and calcitic‐radial) LBF to be less responsive to OA than porcelaneous LBF. In addition, manipulating DIC did not affect calcification when pH was close to present seawater levels in a model encompassing the total population size range. In contrast, larger individuals (&gt;1,200 μm, &gt;1 mg) were sensitive to changes in DIC, a phenomenon we attribute to their physiological requirement to concentrate large quantities of DIC for their calcification process.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2021-03-30.
DOI: 10.1594/pangaea.954128
title: Concentrations of fossil alkanes from Lake Uddelermeer (The Netherlands) in 2012
DOI: 10.1594/pangaea.954129
title: Modern leaf alkane and alcohol concentrations from Lake Uddelermeer (The Netherlands) in 2012
DOI: 10.1594/pangaea.954130
title: Element concentrations (C, N, S, H) from Lake Uddelermeer (The Netherlands) in 2012
DOI: 10.1594/pangaea.721890
title: Seawater carbonate chemistry, processes and elements during experiments with planktonic foraminifera Orbulina universa, 2004

description: We investigate the sensitivity of U/Ca, Mg/Ca, and Sr/Ca to changes in seawater [CO3[2-]] and temperature in calcite produced by the two planktonic foraminifera species, Orbulina universa and Globigerina bulloides, in laboratory culture experiments. Our results demonstrate that at constant temperature, U/Ca in O. universa decreases by 25 +/- 7% per 100 µmol [CO3[2-]] kg**-1, as seawater [CO3[2-]] increases from 110 to 470 µmol kg**-1. Results from G. bulloides suggest a similar relationship, but U/Ca is consistently offset by ~+40% at the same environmental [CO3[2-]]. In O. universa, U/Ca is insensitive to temperature between 15°C and 25°C. Applying the O. universa relationship to three U/Ca records from a related species, Globigerinoides sacculifer, we estimate that Caribbean and tropical Atlantic [CO3[2-]] was 110 +/- 70 µmol kg**-1 and 80 +/- 40 µmol kg**-1 higher, respectively, during the last glacial period relative to the Holocene. This result is consistent with estimates of the glacial-interglacial change in surface water [CO3[2-]] based on both modeling and on boron isotope pH estimates. In settings where the addition of U by diagenetic processes is not a factor, down-core records of foraminiferal U/Ca have potential to provide information about changes in the ocean's carbonate concentration.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).
description: Supplement to: Russell, Ann D; Hönish, Bärbel; Spero, Howard J; Lea, David W (2004): Effects of seawater carbonate ion concentration and temperature on shell U, Mg, and Sr in cultured planktonic foraminifera. Geochimica et Cosmochimica Acta, 68(21), 4347-4361
DOI: 10.1594/pangaea.733910
title: Seawater carbonate chemistry and processes during experiments with benthic foraminifera Ammonia tepida

description: Evidence of increasing concentrations of dissolved carbon dioxide, especially in the surface ocean and its associated impacts on calcifying organisms, is accumulating. Among these organisms, benthic and planktonic foraminifera are responsible for a large amount of the globally precipitated calcium carbonate. Hence, their response to an acidifying ocean may have important consequences for future inorganic carbon cycling. To assess the sensitivity of benthic foraminifera to changing carbon dioxide levels and subsequent alteration in seawater carbonate chemistry, we cultured specimens of the shallow water species Ammonia tepida at two concentrations of atmospheric CO2 (230 and 1900 ppmv) and two temperatures (10 °C and 15 °C). Shell weights and elemental compositions were determined. Impact of high and low pCO2 on elemental composition are compared with results of a previous experiment were specimens were grown under ambient conditions (380 ppvm, no shell weight measurements of specimen grown under ambient conditions are, however, available). Results indicate that shell weights decrease with decreasing [CO3], although calcification was observed even in the presence of calcium carbonate under-saturation, and also decrease with increasing temperature. Thus both warming and ocean acidification may act to decrease shell weights in the future. Changes in [CO3] or total dissolved inorganic carbon do not affect the Mg distribution coefficient. On the contrary, Sr incorporation is enhanced under increasing [CO3]. Implications of these results for the paleoceanographic application of foraminifera are discussed.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).
description: Supplement to: Dissard, Delphine; Nehrke, Gernot; Reichart, Gert-Jan; Bijma, Jelle (2010): Impact of seawater pCO2 on calcification and Mg/Ca and Sr/Ca ratios in benthic foraminifera calcite: results from culturing experiments with Ammonia tepida. Biogeosciences, 7(1), 81-93
DOI: 10.1594/pangaea.947963
title: Seawater carbonate chemistry and test density, trace elements ratios of Peneroplis spp

description: Large Benthic Foraminifera are a crucial component of coral-reef ecosystems, which are currently threatened by ocean acidification. We conducted culture experiments to evaluate the impact of low pH on survival and test dissolution of the symbiont-bearing species Peneroplis spp., and to observe potential calcification recovery when specimens are placed back under reference pH value (7.9). We found that Peneroplis spp. displayed living activity up to 3 days at pH 6.9 (Omega cal &lt; 1) or up to 1 month at pH 7.4 (Omega cal &gt; 1), despite the dark and unfed conditions. Dissolution features were observed under low Omega cal values, such as changes in test density, peeled extrados layers, and decalcified tests with exposed organic linings. A new calcification phase started when specimens were placed back at reference pH. This calcification's resumption was an addition of new chambers without reparation of the dissolved parts, which is consistent with the porcelaneous calcification pathway of Peneroplis spp. The most decalcified specimens displayed a strong survival response by adding up to 8 new chambers, and the contribution of food supply in this process was highlighted. These results suggest that porcelaneous LBF species have some recovery abilities to short exposure (e.g., 3 days to 1 month) to acidified conditions. However, the geochemical signature of trace elements in the new calcite was impacted, and the majority of the new chambers were distorted and resulted in abnormal tests, which might hinder the specimens' reproduction and thus their survival on the long term.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2022-09-06.
DOI: 10.1594/pangaea.954474
title: Loss-on-ignition (LOI) analysis of sediment core UDD-E from Lake Uddelermeer (The Netherlands) in 2012
DOI: 10.1594/pangaea.848673
title: Ocean acidification not likely to affect the survival and fitness of two yemperate benthic foraminiferal species: results from culture experiments

description: Specimens of Bolivina argentea and Bulimina marginata, two widely distributed temperate benthic foraminiferal species, were cultured at constant temperature and controlled pCO2 (ambient, 1000 ppmv, and 2000 ppmv) for six weeks to assess the effect of elevated atmospheric CO2 concentrations on survival and fitness using Adenosine Triphosphate (ATP) analyses and on shell microfabric using high-resolution SEM and image analysis. To characterize the carbonate chemistry of the incubation seawater, total alkalinity and dissolved inorganic carbon were measured approximately every two weeks. Survival and fitness were not directly affected by elevated pCO2 and the concomitant decrease in seawater pH and calcite saturation states (Omega c), even when seawater was undersaturated with respect to calcite. These results differ from some previous observations that ocean acidification can cause a variety of effects on benthic foraminifera, including test dissolution, decreased growth, and mottling (loss of symbiont color in symbiont-bearing species), suggesting that the benthic foraminiferal response to ocean acidification may be species specific. If so, this implies that ocean acidification may lead to ecological winners and losers even within the same taxonomic group.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation is 2015-08-17.
description: Supplement to: McIntyre-Wressnig, Anna; Bernhard, Joan M; Wit, Johannes C; McCorkle, Daniel C (2014): Ocean acidification not likely to affect the survival and fitness of two temperate benthic foraminiferal species: results from culture experiments. Journal of Foraminiferal Research, 44(4), 341-351