cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.939012
title: Phytoplankton carbon related biomass of each species/ taxa or group of indoor mesocosm experiment 2014

description: Previous studies with Baltic Sea phytoplankton combining elevated seawater temperature with CO2 revealed the importance of size trait-based analyses, in particular dividing the plankton in-to edible (&gt; 5 and &lt; 100 µm) and inedible (&lt; 5 and &gt; 100 µm) size classes for mesozoopankton grazers. While the edible phytoplankton responded predominantly negative to warming and the inedible group stayed unaffected or increased, independent from edibility most phyto-plankton groups gained from CO2. Because the ratio between edible and inedible taxa changes profoundly over seasons, we investigated, if community responses can be predicted according to the prevailing composition of edible and inedible groups. We experimentally explored the combined effects of elevated temperatures and CO2 concentrations on a late-summer Baltic Sea community. Total phytoplankton significantly increased in response to elevated CO2 in particu-lar in combination with temperature, driven by a significant gain of the inedible &lt; 5 µm fraction and large filamentous cyanobacteria. Large flagellates disappeared. The edible group was low as usual in summer and decreased with both factors due to enhanced copepod grazing and overall decline of small flagellates. Our results emphasize that the responses of summer communities are complex, but can be predicted by the composition and dominance of size classes and groups.
DOI: 10.1594/pangaea.980706
title: Biomarker results from the eastern Fram Strait between 40 and 33.5 ka b2k

description: We present a biomarker dataset from marine sediment core MD99-2304, retrieved from the eastern Fram Strait (77°37'15.6N, 9°56'54E) at a water depth of 1348 m. The core was collected using a piston corer during the Marion Dufresne IMAGES 5 expedition (leg MD114) in 1999. This dataset provides sea ice extent in the eastern Fram Strait between 40 and 33.5 ka b2k, covering a period within Marine Isotope Stage 3 (MIS 3). With a temporal resolution of 20–40 years per sample, it contributes to the mechanical understanding of abrupt climate change during Dansgaard-Oeschger (D-O) events. The biomarker analysis was conducted at the Alfred Wegener Institute (AWI), Germany, in 2022 and 2023. The measured biomarkers include Total Organic Carbon (TOC) (%), Highly Branched Isoprenoids (HBIs) IP25, HBI diene, HBI-III (Z-isomer), and HBI III (E-isomer), and the sterols brassicasterol, dinosterol, campesterol, and sitosterol (μg/TOC). Biomarker measurements were performed using an Agilent 7890B Gas Chromatograph (GC) equipped with a 30 m DB-1MS column (0.25 mm i.d., 0.25 µm film thickness) and coupled to an Agilent 5977A mass selective detector (MSD, 70 eV constant ionization potential, Scan 50–550 m/z, 1 scan/s, ion source temperature 230°C, Performance Turbo Pump), with selected ion monitoring mode (SIM) for HBIs and full scan mode (50-550 m/Z) for sterols. The balance factors (c) for PIP25 indices are 2.82 for PIIIIP25 (IP25-HBI-III (Z)), 0.025 for PBIP25 (IP25-brassicasterol), and 0.044 for PDIP25 (IP25-dinosterol). TOC measurement was conducted using a Leco CS-125 Carbon-Sulfur Analyzer. The age model of MD99-2304 is established by tuning low field magnetic susceptibility to the magnetic susceptibility of Core MD95-2010 from the Norwegian Sea (Kissel et al., 1999); updated in Sadatzki et al. (2020), and the age model of MD95-2010 was tied to the chronology of MD99-2284 (Berben et al., 2020). The age model for MD99-2304 was established by tuning its low-field magnetic susceptibility to that of core MD95-2010 from the Norwegian Sea (Kissel et al., 1999; Sadatzki et al., 2020). The chronology of MD95-2010 was further tied to core MD99-2284 (Berben et al., 2020), ensuring a robust age framework for the dataset.
DOI: 10.1594/pangaea.945312
title: KOSMOS Bergen 2015 mesocosm study: C. harengus survival

description: To evaluate the influence of ocean acidification on predatory plankton, e.g. Hydrozoa and fish larvae as well as their interaction in complex natural communities, we deployed eight pelagic mesocosms for 53 days (Mai to July) in Raunefjord, Norway, and enclosed 60 m³ of local seawater containing a natural plankton community under post-bloom conditions. Four mesocosms were manipulated to simulate extreme pCO2 levels of 2069 µatm while the other four served as untreated controls. To investigate the interaction between Hydrozoa and fish larvae influenced by OA ee studied OA-induced changes at the top of the food web by following ≈2000 larvae of Atlantic herring (Clupea harengus) hatched inside each mesocosm during the first week of the experiment, and a Hydrozoa population that had already established inside the mesocosms. Organisms of both taxa inside and outside the mesocosms were measured over the course of the experiment in regular intervals. The data stems from 55µm and 500µm Apstein net hauls, subsequent microscopic analyses as well as carbon to nitrogen measurements. Under OA, we detected 20% higher abundance of hydromedusae staged jellyfish, but 25% lower biomass. At the same time, survival rates of Atlantic herring larvae were higher under OA (control pCO2: 0.1%, high pCO2: 1.7%) in the final phase of the study.
DOI: 10.1594/pangaea.980692
title: Eelgrass (Zostera marina) leaf shoot densities and plant sizes in natural and transplanted meadows at three sites in Kieler Bucht, Baltic Sea

description: This dataset contains plant density and plant attributes in eelgrass (Zostera marina) meadows that were restored during the BMBF-SeaStore project compared to natural donor meadows over time. Restoration took place at three sites in the Southwestern Baltic Sea in 2021 (Kieler Förde and Maasholm) and in 2022 (Geltinger Bucht). Two donor beds (Kieler Förde for both, Kieler Förde and Maasholm; and Gelting Donor for Geltinger Bucht) served as source for the transplanted leaf shoots which were planted using the single shoot technique via SCUBA diving without any special anchoring. Planting took place in a 1x1-m checkerboard pattern of 16 x 16 m in total (N=4 per site), in half the checkerboards a density of 8 leaf shoots per m2 was applied and in the other half 16 leaf shoots per m2 was used. Leaf shoot densities were only measured in planted quadrats of 1x1m. The donor meadows were also assessed for signs of damage due to the removal of a maximum of 2% of leaf shoots (comparison donor_pristine vs. donor_harvest). Hapharazdly selected plants were measured for total size (sediment to tip of longest leaves). For the donor area, the corner coordinates of the sampling rectangle are specified.
DOI: 10.1594/pangaea.912506
title: Current and future tree ferns distribution and diversity patterns in subtropical Atlantic Forest

description: In "sp_data.csv" file, we gathered 1,167 tree ferns records related to 15 species, from the literature and herbaria (using SpeciesLink - http://splink.cria.org and GBIF Global Biodiversity Information Facility - https://www.gbif.org). We used "SDM" R-script to predict current and future distributions of each tree fern species, based on occurrence records and bioclimatic variables. Our SDMs were formulated using the sdm R-package, through five different algorithms. To avoid biases created by choosing a single statistical algorithm, we built a single final model through an ensemble approach.Using the "beta" script and species maps, we calculated the β-diversity as the total variance of the community (Total β-diversity, or BDTOTAL; sensu Legendre & De Cáceres 2013) and it was subsequently decomposed in Local Contributions to β-Diversity (LCBD). We calculated BDTOTAL based on the Jaccard dissimilarity coefficient (1- similarity). Then, the LCBD was determined based on the partition of BDTOTAL between the cells (Legendre & De Cáceres 2013). The significance of the LCBD values for each cell was obtained through 999 permutations, where the species are distributed randomly and independently along the grid and the LCBD values are calculated for each random distribution. Significant LCBD values were those with p-value &lt; 0.05. We also followed Legendre (2014) by partitioning the BDTOTAL ​​in species replacement and richness difference components. All β-diversity metrics were calculated with the adespatial R-package using the functions beta.div and beta.div.comp.
DOI: 10.1594/pangaea.949400
title: Proton gradients across the coral calcifying cell layer: effects of light, ocean acidification and carbonate chemistry

description: Internal pH measurements made in the extracellular calcifying medium (ECM), calcifying (calicoblastic) epithelium and mesoglea of the coral Stylophora pistillata using the fluorescent dye SNARF-1 and confocal microscopy. The measurements were made in light and darkness three experiments. Experiment 1 involved using coral samples maintained at pH 8 seawater. Experiment 2 involved placing samples in 4 seawater acidification conditions: pH 8, 7.8, 7.4 and 7.2 for 1 week. Experiment 3 involved placing samples in 4 levels of dissolved inorganic carbon concentration: elevated; ambient, low and very low for one week. The research was carried out at the Centre Scientifique de Monaco between 2014-2017. The aim of the experiment was to determine the pH gradient across the calcifying cell layer and determine how it responded to the three experiments.
description: The experiments were done in the lab on coral samples that have been held in culture in Monaco for the last 30 years. The data file contains pH data from 3 experiments. In experiment 1corals were kept at seawater pH 8. In experiment 2. Corals were exposed to seawater acidification. In experiment 3 corals were exposed to manipulated DIC concentrations. The data are pH measurements taken from 3 internal compartments of the coral Stylophora pistillata: the mesoglea, the calcifying cells and the ECM.
DOI: 10.1594/pangaea.918534
title: Age-depth model from Lateglacial to late Holocene from sediment core MLC from Moss Lake, Washington, USA

description: Accelerator mass spectrometry (AMS) radiocarbon dates were obtained for eight bulk sediment samples (pre-treated with HCl) at the NERC Radiocarbon Facility in East Kilbride. An age-depth model was constructed through Bayesian modelling using a _P_sequence_ deposition model in OxCal v.4.2.4, which included an “event free depth scale” (Staff et al., 2011) to account for the instantaneous deposition of a 4 cm thick tephra layer and interpolated ages every 1 cm.
DOI: 10.1594/pangaea.935393
title: Dendrometer and meteorological data from the TreeNet network, year 2004

description: The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day-night conditions on tree growth remained uncertain. Here we present the first comprehensive field study of hourly-resolved radial stem growth of seven temperate tree species, based on 57 million underlying data points over a period of up to 8 years. We show that trees grow mainly at night, with a peak after midnight, when the vapour pressure deficit (VPD) is among the lowest. A high VPD strictly limits radial stem growth and allows little growth during daylight hours, except in the early morning. Surprisingly, trees also grow in moderately dry soil when the VPD is low. Species-specific differences in diel growth dynamics show that species able to grow earlier during the night are associated with the highest number of hours with growth per year and the largest annual growth increment. We conclude that species with the ability to overcome daily water deficits faster have greater growth potential. Furthermore, we conclude that growth is more sensitive than carbon uptake to dry air, as growth stops before stomata are known to close.
DOI: 10.1594/pangaea.975324
title: Gesellschaft selber machen? Informelle Ökonomien und soziale Teilhabe in ländlichen Armutsräumen. Transkripte der Interviews

description: DE: Der zur Nachnutzung ausgewählte und archivierte Datensatz aus dem Projekt "Gesellschaft selber machen? Informelle Ökonomien und soziale Teilhabe in ländlichen Armutsräumen" besteht aus 28 problemzentrierten Interviews mit Armutsbetroffenen in ländlich-peripherisierten Räumen Ost- und Westdeutschlands. Für eine ausgeglichene Auswahl wurden für jede der vier Untersuchungsregionen eine etwa gleich große Anzahl an Interviews ausgewählt (Abweichungen sind auf drei Interviews zurückzuführen, in denen zwei Personen auf eigenen Wunsch hin gemeinsam befragt wurden). Wir haben uns für eine Auswahl an problemzentrierten Interviews für die Nachnutzung entschieden, die insbesondere für die Armutsforschung relevante Aspekte beinhalten, denen wir im Rahmen unserer spezifischen Forschungsinteressen aber auch durch die pandemiebedingten Verzögerungen und Einschränkungen nicht angemessen Rechnung tragen können. Die Transkripte stehen ab Januar 2027 für wissenschaftliche Sekundärnutzungen in der Forschung und akademischen Lehre zur Verfügung.EN: The dataset archived and selected for re-use consists of 28 problem-centred interviews with people experiencing poverty in rural-peripheral areas of East and West Germany. For a balanced selection, we chose a roughly equal number of interviews for each of the four study regions (deviations are due to three interviews in which two people were interviewed together at their own request). We decided to use a selection of problem-centred interviews for the follow-up study that included aspects particularly relevant to poverty research, which we are unable to adequately address within the scope of our specific research interests, but also due to the pandemic-related delays and restrictions. These transcripts are available from January 2027 for scientific re-use in research and academic teaching.
description: Für die Nutzung dieses Datensatzes besteht ein Embargo bis zum 31.12.2026
DOI: 10.1594/pangaea.935404
title: Dendrometer and meteorological data from the TreeNet network, year 2009

description: The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day-night conditions on tree growth remained uncertain. Here we present the first comprehensive field study of hourly-resolved radial stem growth of seven temperate tree species, based on 57 million underlying data points over a period of up to 8 years. We show that trees grow mainly at night, with a peak after midnight, when the vapour pressure deficit (VPD) is among the lowest. A high VPD strictly limits radial stem growth and allows little growth during daylight hours, except in the early morning. Surprisingly, trees also grow in moderately dry soil when the VPD is low. Species-specific differences in diel growth dynamics show that species able to grow earlier during the night are associated with the highest number of hours with growth per year and the largest annual growth increment. We conclude that species with the ability to overcome daily water deficits faster have greater growth potential. Furthermore, we conclude that growth is more sensitive than carbon uptake to dry air, as growth stops before stomata are known to close.
DOI: 10.1594/pangaea.957416
title: A time series study of nitrous oxide distribution and ancillary variables off Conception, Chile (2016-2020)

description: Time series off Concepcion (Chile) was initiated on half 2002 by Concepción University (Chile) in order to characterize the main scales of temporal variability of main biogeochemical carbon (C )and nitrogen (N) cycling at a single location and relate them to physical processes (i.e. El Niño-Southern Oscillation, ENSO). The central area off Chile has the widest continental shelf of Chile, extended about 40 km offshore. This system presents other important features: it is under the influence of wind-driven coastal upwelling with a strong seasonal pattern and it is certainly one of most productive regions in the ocean and also is characterized by a semi-permanent (fluctuating in extension) oxygen minimum zone (OMZ) extending from ca. 30 m depth down to depth, which bath the shelf sediments. Its hydrographic structure is strongly affected by runoff from the Itata and Bio Bio river (up to 3000 m3 s-1) with maximum discharges during winter. This data report was focussed on nitrous oxide (N2O) measurements and ancillary variables at monthly frequency to determine how changes in the nutricline, oxycline and others control N2O distribution. Starting on July 2002 the time series was initiated with a single station located off Dichato, corresponding to Station 18, located at 36º30,8' S - 73º07,7' W, with a depth of 90 m depth. At this station, a CTD with oxygen sensor (CTDO) was deployed from surface to near the bottom and water samples was obtained with 10L Niskin bottles, at the following discrete depth: surface, 5, 10, 15, 20, 30, 50, 65, 80 m depth. Nitrate and N2O (a greenhouse gas) was included in the measurement using methodology delineated by Farías et al. (2015). This dataset includes data that was collected with the research vessel KAY KAY II between 2016 and 2020.
description: Further information on methods:* Nitrate & Nitrite: filtered 45 µm , colorimetric determination, Seal Autoanalyzer* Nitrous oxide: headspace technique, gas chromatography, ECD detectorT (according to Wilson et al. 2018)
DOI: 10.1594/pangaea.935390
title: Dendrometer and meteorological data from the TreeNet network, year 2001

description: The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day-night conditions on tree growth remained uncertain. Here we present the first comprehensive field study of hourly-resolved radial stem growth of seven temperate tree species, based on 57 million underlying data points over a period of up to 8 years. We show that trees grow mainly at night, with a peak after midnight, when the vapour pressure deficit (VPD) is among the lowest. A high VPD strictly limits radial stem growth and allows little growth during daylight hours, except in the early morning. Surprisingly, trees also grow in moderately dry soil when the VPD is low. Species-specific differences in diel growth dynamics show that species able to grow earlier during the night are associated with the highest number of hours with growth per year and the largest annual growth increment. We conclude that species with the ability to overcome daily water deficits faster have greater growth potential. Furthermore, we conclude that growth is more sensitive than carbon uptake to dry air, as growth stops before stomata are known to close.
DOI: 10.1594/pangaea.935391
title: Dendrometer and meteorological data from the TreeNet network, year 2002

description: The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day-night conditions on tree growth remained uncertain. Here we present the first comprehensive field study of hourly-resolved radial stem growth of seven temperate tree species, based on 57 million underlying data points over a period of up to 8 years. We show that trees grow mainly at night, with a peak after midnight, when the vapour pressure deficit (VPD) is among the lowest. A high VPD strictly limits radial stem growth and allows little growth during daylight hours, except in the early morning. Surprisingly, trees also grow in moderately dry soil when the VPD is low. Species-specific differences in diel growth dynamics show that species able to grow earlier during the night are associated with the highest number of hours with growth per year and the largest annual growth increment. We conclude that species with the ability to overcome daily water deficits faster have greater growth potential. Furthermore, we conclude that growth is more sensitive than carbon uptake to dry air, as growth stops before stomata are known to close.
DOI: 10.1594/pangaea.935392
title: Dendrometer and meteorological data from the TreeNet network, year 2003

description: The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day-night conditions on tree growth remained uncertain. Here we present the first comprehensive field study of hourly-resolved radial stem growth of seven temperate tree species, based on 57 million underlying data points over a period of up to 8 years. We show that trees grow mainly at night, with a peak after midnight, when the vapour pressure deficit (VPD) is among the lowest. A high VPD strictly limits radial stem growth and allows little growth during daylight hours, except in the early morning. Surprisingly, trees also grow in moderately dry soil when the VPD is low. Species-specific differences in diel growth dynamics show that species able to grow earlier during the night are associated with the highest number of hours with growth per year and the largest annual growth increment. We conclude that species with the ability to overcome daily water deficits faster have greater growth potential. Furthermore, we conclude that growth is more sensitive than carbon uptake to dry air, as growth stops before stomata are known to close.
DOI: 10.1594/pangaea.935395
title: Dendrometer and meteorological data from the TreeNet network, year 2005

description: The timing of diel stem growth of mature forest trees is still largely unknown, as empirical data with high temporal resolution have not been available so far. Consequently, the effects of day-night conditions on tree growth remained uncertain. Here we present the first comprehensive field study of hourly-resolved radial stem growth of seven temperate tree species, based on 57 million underlying data points over a period of up to 8 years. We show that trees grow mainly at night, with a peak after midnight, when the vapour pressure deficit (VPD) is among the lowest. A high VPD strictly limits radial stem growth and allows little growth during daylight hours, except in the early morning. Surprisingly, trees also grow in moderately dry soil when the VPD is low. Species-specific differences in diel growth dynamics show that species able to grow earlier during the night are associated with the highest number of hours with growth per year and the largest annual growth increment. We conclude that species with the ability to overcome daily water deficits faster have greater growth potential. Furthermore, we conclude that growth is more sensitive than carbon uptake to dry air, as growth stops before stomata are known to close.