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  • 2020-2024  (72,461)
  • 2021  (72,461)
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  • 1
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    Studies in Papuasian Syzygium (Myrtaceae): 2. The furfuraceous species of subg. Syzygium (2021)
    Naturalis Biodiversity Center
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 66 no. 1, pp. 57-81
    Details
    Publication Date: 2024-05-19
    Description: The furfuraceous species of Syzygium subg. Syzygium in Papuasia are revised. The scurfy, furfuraceous epidermis that is a feature of the inflorescence branches and sometimes also of the hypanthium, the commonly chestnut brown colour of the dried leaves, and the reduced calyx that occurs in many species are characteristic features of the group. Within this subgenus, a new section Furfuraceum is described to accommodate these morphologically recognisable species. Descriptions are provided for each of the 40 species recognised, 28 of which are new. An identification key, distribution maps and an index to numbered exsiccatae are provided.
    Keywords: Plant Science ; Ecology ; Evolution ; Behavior and Systematics ; Furfuraceum ; identification key ; maps ; Myrtaceae ; Papuasia ; revision ; Syzygium
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
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    More than 50 years of Th-234 data: a comprehensive global oceanic compilation (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-19
    Description: The ²³⁴Th-²³⁸U radioactive pair has been extensively used to evaluate the efficiency with which photosyntetically fixed carbon is exported from the surface ocean by means of the biological pump since the 90's. The seminal work of Buesseler et al. (1992) proposed that particulate organic carbon (POC) flux can be indirectly calculated from ²³⁴Th distributions if the ratio of POC to ²³⁴Th measured on sinking particles (POC:²³⁴Th) at the desired export depth is known. Since then, a huge amount of ²³⁴Th depth profiles have been collected using a variety of sampling instruments and strategies that have changed along years. This is a global oceanic compilation of ²³⁴Th measurements, that collects results from innumerable researchers and laboratories over a period exceeding 50 years. The present compilation is made of a total 223 datasets: 214 from studies published either in articles in referred journals, PhD thesis or repositories, and 9 unpublished datasets. Including measurements from JGOFS, VERTIGO and GEOTRACES programs, with sampling from approximately 5000 locations spanning all the oceans. The compilation includes total ²³⁴Th profiles, dissolved and particulate ²³⁴Th concentrations, and POC:²³⁴Th ratios (both from pumps and sediment traps) for two sizes classes (1-53 μm and 〈 53 μm) when available. Appropriate metadata have been included, including geographic location, date, and sample depth, among others. When available, we also include water temperature, salinity, ²³⁸U data and particulate organic nitrogen data. Data sources and methods information (including ²³⁸U and ²³⁴Th) are also detailed along with valuable information for future data analysis such as bloom stage and steady/non-steady state conditions at the sampling moment. This undertaking is a treasure of data to understand and quantify how oceanic carbon cycle functions and how it will change in future. The compilation can be downloaded in three different ways: 1) A single merged file including all the individual excel files. This option can be accessed under "Other version: More than 50 years of Th-234 data: a comprehensive global oceanic compilation (single xlsx file)". 2) A summary table that includes details from cruise, sampling dates, techniques applied, authors and DOI of the compiled ²³⁴Th data, among others, each line corresponds to a specific dataset. The table can be accessed by clicking ""View dataset as HTML" and downloaded in "Download dataset as tab-delimited text". 3) Individual Excel files for each dataset can be manually chosen from the summary table, corresponding to the complete ²³⁴Th dataset and metadata from a specific publication or program. This option is available by clicking "View dataset as HTML". Furthermore, all files referred to can be downloaded in one go as ZIP or TAR.
    Keywords: 234Th; Author(s); Binary Object; biological carbon pump; Carbon, organic, particulate/Thorium-234 ratio; carbon export; Chief scientist(s); Cruise/expedition; DATE/TIME; ELEVATION; Gear; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; JGOFS; Joint Global Ocean Flux Study; Journal/report title; LATITUDE; LONGITUDE; Multiple cruises/expeditions; Ocean; Ocean and sea region; Period; POC flux; Project; Reference of data; Thorium-234, dissolved; Thorium-234, particulate; Thorium-234, total; Uniform resource locator/link to reference; Uranium-238; Vessel; Year of publication
    Type: Dataset
    Format: text/tab-separated-values, 4056 data points
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  • 3
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    New chromosome counts and other karyological data for members of the Stemonaceae (2021)
    Naturalis Biodiversity Center
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 66 no. 1, pp. 53-56
    Details
    Publication Date: 2024-05-18
    Description: Chromosome numbers and other karyological data for ten Stemona species and for Stichoneuron caudatum are presented, including first reports for Stemona burkillii, S. involuta, S. mairei and S. phyllantha.All investigated taxa of Stemona exhibit n = x = 7 (2n = 14) chromosomes. For Stichoneuron caudatum an earlier count revealing 2n = 18 is confirmed. The observed chromosome lengths range between 0.9 and 6.9 μm (largest chromosome in Stichoneuron caudatum).Additionally, the genome sizes of seven Stemona species and of Stichoneuron caudatum are reported. The obtained results are compared with literature data and discussed.
    Keywords: Plant Science ; Ecology ; Evolution ; Behavior and Systematics ; chromosome length ; chromosome number ; genome size ; karyology ; Stemona ; Stemonaceae ; Stichoneuron
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 4
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    Coarse sand distribution in IODP Site 341-U1417 (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Keywords: 341-U1417; AGE; COMPCORE; Composite Core; DEPTH, sediment/rock; Exp341; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Mid Pleistocene Transition; Size fraction 2.000-0.630 mm, coarse sand; Southern Alaska Margin: Tectonics, Climate and Sedimentation
    Type: Dataset
    Format: text/tab-separated-values, 360 data points
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  • 5
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    Volume susceptibility and anhysteretic susceptibility divided by susceptibility for the 100-248 meters composite depth (1.3-3.2 Ma) interval from Integrated Ocean Drilling Program (IODP) Site 303-U1308 (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Description: Here we present volume susceptibility and anhysteretic susceptibility divided by susceptibility for the 100-248 meters composite depth (1.3-3.2 Ma) interval from Integrated Ocean Drilling Program (IODP) Site U1308 (49° 53'N, 24° 14'W; water depth 3871 m). Methods are described in Channell et al. (2016) (Quaternary Science Reviews, 131, 1-19, 2016, doi.org/10.1016/j.quascirev.2015.10.011). The magnetic records for 0-1.3 Ma at Site U1308 were published in Channell et al. 2008 (Earth and Planetary Science Letters, 274, 59-71, 2008, doi 10.1016/j.epsl.2008.07.005) and have been archived at: https://doi.org/10.1594/PANGAEA.808942, https://doi.org/10.1594/PANGAEA.808945, https://doi.org/10.1594/PANGAEA.808946. Benthic oxygen isotope stratigraphy for the 0- 3.2 Ma interval are archived at (https://doi.org/10.1594/PANGAEA.871936) and are the basis for the age model. The mean sedimentation rate for the 1.3-3.2 Ma interval is 8.5 cm/kyr.
    Keywords: 303-U1308; ARM Susceptibility/susceptibility ratio; COMPCORE; Composite Core; Depth, composite; Exp303; IODP Site U1308; Joides Resolution; Magnetic susceptibility, volume; Magnetization directions; North Atlantic; North Atlantic Climate 1; see Channell et al. (2016)
    Type: Dataset
    Format: text/tab-separated-values, 44169 data points
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  • 6
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    A multi-proxy record of IODP Site 341-U1417 (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Description: By means of a multiproxy data set combining biomarker (alkenones, n-alkanes), microfossil (diatoms) and sedimentological (ice rafted debris, XRF) data obtained from sediments from IODP Site U1417 in the Gulf of Alaska, we elucidate the paleoenvironmental setting in this area during the Mid Pleistocene Transition. The data point to a stimulation of the marine primary productivity through the input of nutrients (e.g. iron) via aeolian dust and icebergs. These fertilization pulses were likely triggered by the dynamic behaviour of the Cordilleran Ice Sheet during the Pleistocene.
    Keywords: Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Mid Pleistocene Transition
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 7
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    Magnetization directions (Declination, Inclination, MAD), relative paleointensity (RPI) and susceptibility for IODP Site 303-U1308 for 100-248 mcd (1.3-3.2 Ma) (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Description: Integrated Ocean Drilling Program (IODP) Site 303-U1308 (49° 53'N, 24° 14'W; water depth 3871 m) provides a record of magnetization directions, relative paleointensity (RPI), susceptibility and benthic stable isotope stratigraphy back to 3.2 Ma. The record since 1.5 Ma has been published (Channell et al., Earth and Planetary Science Letters, 274, 59-71, 2008). This paper deals with the interval from 1.3 Ma to 3.2 Ma (Early Pleistocene-Late Pliocene). The benthic oxygen isotope record in this interval can be correlated to marine isotope stages (MIS) 51 to KM2, with an apparent hiatus that removed MIS G1-G2, immediately below the Gauss-Matuyama boundary. The mean sedimentation rate for the 1.5-3.2 Ma period is 8.5 cm/kyr. The age model was built by correlation of the oxygen isotope record to the LR04 stack. Carbon isotope data imply the influence of North Atlantic Deep Water (NADW) during interglacials with influence of southern source waters during glacials throughout the period, but with more muted δ¹³C variations in the Gauss Chron. Apart from the expected polarity reversals, three magnetic excursions are recorded: Punaruu in MIS 31/32 at 1092 ka, Gilsa in MIS 54 at 1584 ka, and a newly recognized excursion labeled Porcupine (after the nearby Porcupine abyssal plane) in MIS G7 at 2737 ka. The ages of reversals at Site 303-U1308, on the LR04 time scale, are consistent with the current geomagnetic polarity timescale (GPTS) with the exception of the base of the Olduvai Subchron in MIS 73 at 1925 ka, 26 kyr younger than in the current GPTS. The RPI record at Site 303-U1308 is calibrated using the oxygen isotope age model, and combined with four other North Atlantic records to obtain a North Atlantic RPI stack for 1.2-2.2 Ma (NARPI-2200). For 2.2-3.2 Ma, no Atlantic RPI records other than Site 303-U1308 exist. The NARPI-2200 stack is compared with published RPI stacks: Epapis, Sint-2000 and PADM2M. The mean sedimentation rates of the North Atlantic sites in NARPI-2200 are greater (by about an order of magnitude) than most of the records incorporated in other stacks. The comparison of Pacific Epapis and NARPI-2200 yields an apparent lag for NARPI-2200 relative to Epapis, attributed the Epapis age model constructed by correlation of magnetic concentration parameters (a proxy for carbonate percentage) to a calibrated oxygen isotope record. The long RPI record from Site 303-U1308 yields a very similar mean value for the Brunhes and Matuyama virtual axial dipole moments (7.5 x 1022 A m²), implying no polarity bias for RPI as in Sint-2000 and PADM2M. The results strengthen the case that RPI can be used to improve global stratigraphic correlation, especially for sites with mean sedimentation rates up to several decimeters/kyr.
    Keywords: IODP Site U1308; Magnetization directions; North Atlantic
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
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    Lipid biomarkers, siliceous microfossil assemblages, biogenic silica and carbon and nitrogen bulk and isotope analyses from IODP Hole 341-U1417D, Gulf of Alaska (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Description: We analysed IODP Expedition 341 Site U1417 to understand the palaeoceanography in the Gulf of Alaska across the Pliocene and early Pleistocene (4-1.7 Ma). The data submitted here are productivity-related biomarkers (alkenone and brassicasterol accumulation rates), siliceous microfossils (total diatoms and silicoflagellate accumulation rates and diatom assemblages accumulation rates and relative abundance), biogenic silica accumulation rates, bulk carbon and nitrogen accumulation rates and stable isotope ratios (δ13C and δ15N), terrestrial and aquatic n-alkane accumulation rates, the Shannon-Weaver index and preservation value of diatoms (prev. value). The diatom assemblages include pelagic high productivity, pelagic warm water, coastal high productivity, coastal moderate productivity, benthic and freshwater habitats.
    Keywords: 341-U1417D; Abundance estimate; Accumulation rate, 24-Methylcholesta-5,22E-dien-3beta-ol; Accumulation rate, alkenones; Accumulation rate, diatoms; Accumulation rate, diatoms, benthic; Accumulation rate, diatoms, coastal high productivity; Accumulation rate, diatoms, coastal moderate productivity; Accumulation rate, diatoms, freshwater; Accumulation rate, diatoms, pelagic high productivity; Accumulation rate, diatoms, pelagic warm water; Accumulation rate, n-Alkanes, aquatic; Accumulation rate, n-Alkanes, terrestrial; Accumulation rate, nitrogen; Accumulation rate, opal; Accumulation rate, silicoflagellates; Accumulation rate, total organic carbon; after Jaeger et al. (2014); After Sánchez-Montes et al. (2019); After Sánchez-Montes et al. (2020); Age; Age, error; alkenone MAR; aquatic n-alkane MAR; benthic diatoms; biogenic silica MAR; brassicasterol MAR; Calculated; Calculated after Sánchez-Montes et al. (2019); Calculated after Sánchez-Montes et al. (2020); Carbon, organic, total; carbon isotope ratio (δ13C); coastal high productivity diatoms; coastal moderate productivity diatoms; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; diatoms; Diatoms, benthic; Diatoms, coastal high productivity; Diatoms, coastal moderate productivity; Diatoms, pelagic high productivity; Diatoms, pelagic warm water; Diatoms freshwater; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Exp341; freshwater diatoms; Gulf of Alaska; IODP 341; Joides Resolution; Nitrogen; nitrogen isotope ratio (δ15N); Opal, biogenic silica; Paleoceanography; pelagic high productivity diatoms; pelagic warm water diatoms; Pleistocene; Pliocene; Preservation value; prev. value; Sample code/label; Sample ID; Sedimentation rate; Shannon Diversity Index; Shannon-Weaver index; silicoflagellate; Site U1417; Southern Alaska Margin; Southern Alaska Margin: Tectonics, Climate and Sedimentation; terrigenous n-alkane MAR; TN; TOC; δ13C; δ15N
    Type: Dataset
    Format: text/tab-separated-values, 6501 data points
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  • 9
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    Barium/Aluminum ratios of IODP Site 341-U1417 (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Keywords: 341-U1417; AGE; Barium/Aluminium ratio; COMPCORE; Composite Core; DEPTH, sediment/rock; Exp341; Gulf of Alaska; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Mid Pleistocene Transition; Southern Alaska Margin: Tectonics, Climate and Sedimentation; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 134 data points
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  • 10
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    Meters composite depth (mcd) versus component declination, inclination and maximum angular deviation (MAD) values for natural remanent magnetization (NRM) from Integrated Ocean Drilling Program (IODP) Site U1306 (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Description: The data comprise meters composite depth (mcd) versus component declination, inclination and maximum angular deviation (MAD) values for natural remanent magnetization (NRM) from Integrated Ocean Drilling Program (IODP) Site U1306 drilled on the crest of the Eirik Drift (SW Greenland) in 2272 m water depth. The component magnetizations were determined from stepwise alternating field demagnetization of NRM and measured on a pass-through u-channel magnetometer (see Channell et al., 2014). Planktic oxygen isotope (δ18O) and relative paleointensity (RPI) data are used in tandem to generate an age model for the last 1 Myr. For the 1-1.5 Ma interval, the age model is based on RPI alone due to insufficient foraminifera for isotope analyses. Utilizing RPI and δ18O in tandem allows recognition of low-δ18O "events" prior to glacial Terminations I, III, IV, V, VII, VIII, IX and X, that are independently supported by radiocarbon dates through the last deglaciation, and are attributed to local or regional surface-water effects. At Site U1306, Quaternary sedimentation rates (mean ~15 cm/kyr) are elevated during peak glacials and glacial onsets, and are reduced during interglacials, in contrast to the pattern at Site U1305 in 3460 m water depth at the distal toe of the drift, 191 km SW of Site U1306. The contrasting sedimentation-rate pattern appears to hold for the entire ~1.5 Myr record. The slackening and/or shoaling (due to lowered salinity) of the Deep Western Boundary Current (DWBC) during glacial intervals coincided with greater sediment supply to Site U1306 whereas the deepening, and possibly increased vigor, of the DWBC during interglacial intervals boosted sediment supply to Site U1305.
    Keywords: 303-U1306; COMPCORE; Composite Core; Declination; Deep Western Boundary Current; DEPTH, sediment/rock; Eirik Drift; Exp303; Inclination; Joides Resolution; Maximum angular deviation; North Atlantic; North Atlantic Climate 1; Northwest Atlantic; Oxygen isotopes; Quaternary; relative paleointensity; see Channell et al. (2014)
    Type: Dataset
    Format: text/tab-separated-values, 61119 data points
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