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PANGAEA - Publishing Network for Geoscientific & Environmental Data (845.122 recursos)

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PANGAEA tech-keyword 'supplement' (10352 data sets)

Mostrando recursos 1 - 20 de 24.681

  1. Seawater carbonate chemistry and biomarker pigments and phytoplankton community composition in different biogeochemical regions of the Southern Ocean

    Endo, H; Hattori, Hiroshi; Mishima, Tsubasa; Hashida, Gen; Sasaki, H; Nishioka, Jun; Suzuki, Koji
    The ongoing rise in atmospheric CO2 concentration is causing rapid increases in seawater pCO2levels. However, little is known about the potential impacts of elevated CO2 availability on the phytoplankton assemblages in the Southern Ocean's oceanic regions. Therefore, we conducted four incubation experiments using surface seawater collected from the subantarctic zone (SAZ) and the subpolar zone (SPZ) in the Australian sector of the Southern Ocean during the austral summer of 2011-2012. For incubations, FeCl3 solutions were added to reduce iron (Fe) limitation for phytoplankton growth. Ambient and high (~750 µatm) CO2 treatments were then prepared with and without addition of CO2-saturated...

  2. Ostracode abundance and Simpson's index over the past 700,000 years at IODP Site 346-U1427

    Huang, Huai-Hsuan May; Yasuhara, Moriaki; Iwatani, Hokuto; Alvarez Zarikian, Carlos A; Bassetti, Maria Angela; Sagawa, Takuya
    The Sea of Japan is a marginal sea, semi-enclosed by the Eurasian Continent, Korean Peninsula, Japanese archipelago, and connected to the Pacific Ocean and adjacent seas by three shallow straits (water depths < 130 m). Marginal seas are ideal natural laboratories to study biotic responses to large-scale environmental changes as they are typically sensitive to glacial-interglacial and stadial-interstadial climatic cycles. However, only limited number of studies covers time periods beyond 1 to 2 glacial-interglacial cycles. Here we present a 700,000-year record of benthic biotic response to past oceanographic changes in the southern Sea of Japan, covering the past seven glacial-interglacial...

  3. Seawater carbonate chemistry and metabolism and growth of epilithic and endolithic coral-reef turf algal

    Johnson, Maggie Dorothy; Comeau, Steeve; Lantz, Coulson A; Smith, Jennifer E
    Turf algal assemblages are ubiquitous primary producers on coral reefs, but little is known about the response of this diverse group to ocean acidification (OA) across different temperatures. We tested the hypothesis that CO2 influences the functional response of epilithic and endolithic turf assemblages to increasing temperature. Replicate carbonate plugs covered by turf were collected from the reef and exposed to ambient and high pCO2 (1000 µatm) conditions for 3 weeks. Each pCO2 treatment was replicated across six temperatures (24.0-31.5 °C) that spanned the full seasonal temperature range on a fringing reef in Moorea, French Polynesia, and included one warming...

  4. Paleoceanography data of sediment core GS15-198-36-CC in the Denmark Strait

    Sessford, Evangeline; Tisserand, Amandine; Risebrobakken, Bjørg; Andersson, Carin; Dokken, Trond; Jansen, Eystein
    Your paper abstract will be added here...

  5. Fish scale deposition rates and export production from 1860 to 2005 AD off Peru

    Salvatteci, Renato; Field, David; Gutièrrez, Dimitri; Baumgartner, Tim; Ferreira, Leonardo V; Ortlieb, Luc; Sifeddine, Abdelfettah; Grados, Carmen; Bertrand, Arnaud
    The Humboldt Current System (HCS) has the highest production of forage fish in the world, although it is highly variable and the future of the primary component, anchovy, is uncertain in the context of global warming. Paradigms based on late 20th century observations suggest that large-scale forcing controls decadal-scale fluctuations of anchovy and sardine across different boundary currents of the Pacific. We develop records of anchovy and sardine fluctuations since 1860 AD using fish scales from multiple sites containing laminated sediments and compare them with Pacific basin-scale and regional indices of ocean climate variability. Our records reveal two main anchovy...

  6. Occurence of benthic foraminifera off Boknis Eck, western Baltic Sea (Tables 12-24)

    Wefer, Gerold
    Samples of algae and sediment were taken between July 1973 and May 1975 at intervals of 2-5 weeks from a number of depths at the entrance of Eckernförder Bay (Western Baltic Seal. The purpose was to ascertain the correlation between the settlement of foraminifera and ecofactors, and to determine the annual carbonate production by foraminifera. Produection data were compared with the foraminifera content of the sediments. Information on the extend and place of dissolution could be gained by measuring the saturation of the water with mineral carbonates. The exact area of colonisation (=sediment surfaee, in the sediment or on algae, Fig....

  7. Copepod community ingestion during POLARSTERN cruise PS81 (ANT-XXIX/1)

    Bode, Maya; Koppelmann, Rolf; Teuber, Lena; Hagen, Wilhelm; Auel, Holger

  8. Seawater carbonate chemistry and microbial community composition and host-pathogen interactions between the blood clam and Vibrio harveyi

    Zha, Shanjie; Liu, Saixi; Su, Wenhao; Shi, Wei; Xiao, Guoqiang; Yan, Maocang; Liu, Guangxu
    It has been suggested that climate change may promote the outbreaks of diseases in the sea through altering the host susceptibility, the pathogen virulence, and the host-pathogen interaction. However, the impacts of ocean acidification (OA) on the pathogen components of bacterial community and the host-pathogen interaction of marine bivalves are still poorly understood. Therefore, 16S rRNA high-throughput sequencing and host-pathogen interaction analysis between blood clam (Tegillarca granosa) and Vibrio harveyi were conducted in the present study to gain a better understanding of the ecological impacts of ocean acidification. The results obtained revealed a significant impact of ocean acidification on the...

  9. Seawater carbonate chemistry and sperm-egg collisions, gamete fusion, and generation of Ca2+ oscillations of a broadcast spawning bivalve, Tegillarca granosa

    Shi, Wei; Han, Yu; Guo, Cheng; Zhao, Xinguo; Liu, Saixi; Su, Wenhao; Wang, Yichen; Zha, Shanjie; Chai, Xueliang; Liu, Guangxu
    Although the effect of ocean acidification on fertilization success of marine organisms is increasingly well documented, the underlying mechanisms are not completely understood. The fertilization success of broadcast spawning invertebrates depends on successful sperm-egg collisions, gamete fusion, and standard generation of Ca2+oscillations. Therefore, the realistic effects of future ocean pCO2 levels on these specific aspects of fertilization of Tegillarca granosa were investigated in the present study through sperm velocity trials, fertilization kinetics model analysis, and intracellular Ca2+assays, respectively. Results obtained indicated that ocean acidification significantly reduced the fertilization success of T. granosa, which could be accountable by (i) decreased sperm...

  10. Copepod community ingestion and respiration in the Eastern Atlantic Ocean during POLARSTERN cruise PS81 (ANT-XXIX/1)

    Bode, Maya; Koppelmann, Rolf; Teuber, Lena; Hagen, Wilhelm; Auel, Holger
    The copepods' impact on vertical carbon flux was assessed for stratified depth layers down to 2000 m at six stations along a transect between 24°N and 21°S in the eastern Atlantic Ocean in October/November 2012. Total copepod community consumption ranged from 202-604 mg C m-2 d-1, with highest ingestion rates in the tropical North Atlantic. Calanoids consumed 75-90% of the particulate organic carbon (POC) ingested by copepods, although the relative contribution of cyclopoids (mostly Oncaeidae) increased with depth. Net ingestion (=consumption - fecal pellet egestion) of POC varied from 106-379 mg C m-2 d-1 for calanoids and 37-51 mg C...

  11. Distribution and isotopic composition of trimethylamine, dimethylsulfide and dimethylsulfoniopropionate in marine sediments of Aarhus Bay

    Zhuang, Guang-Chao; Lin, Yu-Shih; Bowles, Marshall W; Heuer, Verena B; Lever, Mark A; Elvert, Marcus; Hinrichs, Kai-Uwe
    Methylated amines and sulfides are ubiquitous organic nitrogen and sulfur compounds in the marine environment and could serve as important energy substrates to methanogens inhabiting anoxic sediments. However, their abundance and isotopic values remain largely unconstrained in marine sediments. In this study, we investigated the distribution of trimethylamine (TMA), dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) in Aarhus Bay, Denmark and provided the first report for their stable carbon isotopic composition. Simultaneous measurement of those two compounds in small volumes of pore waters and sediments was accomplished with gas chromatography in combination with either a purge and trap system for quantification or...

  12. Seawater carbonate chemistry and burrowing behaviour, Ca2+/Mg2+-ATPase activity, metabolism, and gene expression of a bivalve species, Sinonovacula constricta

    Peng, Chao; Zhao, X; Liu, S; Shi, Wei; Han, Yu; Peng, Xin; Chai, Xueliang; Liu, Guangxu
    Although the effect of ocean acidification on fertilization success of marine organisms is increasingly well documented, the underlying mechanisms are not completely understood. The fertilization success of broadcast spawning invertebrates depends on successful sperm-egg collisions, gamete fusion, and standard generation of Ca2+oscillations. Therefore, the realistic effects of future ocean pCO2 levels on these specific aspects of fertilization of Tegillarca granosa were investigated in the present study through sperm velocity trials, fertilization kinetics model analysis, and intracellular Ca2+assays, respectively. Results obtained indicated that ocean acidification significantly reduced the fertilization success of T. granosa, which could be accountable by (i) decreased sperm...

  13. Measured discharge, hydrochemical parameters and computed fluxes (DOC, DN, solutes, suspended sediment) of a small Low Arctic watershed on Herschel Island (2014-2016)

    Coch, Caroline; Lamoureux, Scott; Knoblauch, Christian; Eischeid, Isabell; Fritz, Michael; Obu, Jaroslav; Lantuit, Hugues
    Water samples were collected at the outflow of Ice Creek West on Herschel Island, Yukon Territory, Canada in the summers of 2014, 2015 and 2016 using an automatic water sampler (ISCO 3700).

  14. (Pages 203-204) Concentration in Aluminium-26 in layers of a ferromanganese crust recovered in the Pacific Ocean

    Reyss, Jean-Louis; Yokoyama, Y
    Manganese nodules are generally considered to have accumulated very slowly. Radiometric studies by 230Th, 231Pa, and 234U/238U suggest their growth rates to be a few mm per 10 million yr. This leads to an enigma: how do they escape from burial by associated marine sediments which are accumulating three orders of magnitude faster than the nodules? Though this problem remains open, the postulated slow growth rates might permit manganese nodules to accumulate in a small volume high concentrations of long lived cosmogenic radionuclides 10Be (half tau = 1.5 Myr) and 26Al (half tau = 0.715 Myr) which were formed through...

  15. Seawater carbonate chemistry and sperm motility and fertilisation success in blood clam, Tegillarca granosa

    Shi, Wei; Zhao, Xinguo; Han, Yu; Guo, Cheng; Liu, Saixi; Su, Wenhao; Wang, Yichen; Zha, Shanjie; Chai, Xueliang; Fu, Wandong; Yang, Huicheng; Liu, Guangxu
    Although it has been shown that ocean acidification generally has a negative impact on fertilisation success of broadcast spawning marine organisms, whether induced fertilisation success reduction is a consequence of elevated pCO2 or decreased pH remains unclear. Therefore, the impacts of HCl- and CO2-induced acidified seawater on sperm motility and gametes fertilisation capability of a broadcast spawning bivalve species, Tegillarca granosa were investigated in the present study. The results showed that the fertilisation capability of both gametes was significantly reduced in either HCl- or CO2-acidified seawater. In addition, significant impacts on sperm motility were observed in the group exposed to...

  16. Sediment characteristics of core LYL-P1-14 from Ymer Lake, East Greenland

    van der Bilt, Willem G M; Rea, Brice R; Spagnolo, Matteo; Roerdink, Desiree L; Jørgensen, Steffen L; Bakke, Jostein
    We fingerprint the geomorphological expression of Holocene climate transitions from East Greenland lake sediments (core LYL-P1-14) using physical (grain size, oragnic content - LOI, sediment density - DBD), visual (3-D Computed Tomography) and geochemical (X-Ray Fluorescence, X-Ray Diffraction) evidence.

  17. Pollen, spore, and dinoflagellate cyst assemblages of sediment core GeoB2107-3

    Gu, Fang; Zonneveld, Karin A F; Chiessi, Cristiano Mazur; Arz, Helge W; Pätzold, Jürgen; Behling, Hermann
    Long-term changes in vegetation and climate of southern Brazil, as well as ocean dynamics of the adjacent South Atlantic, were studied by analyses of pollen, spores and organic-walled dinoflagellate cysts (dinocysts) in marine sediment core GeoB2107-3 collected offshore southern Brazil covering the last 73.5 cal kyr BP. The pollen record indicates that grasslands were much more frequent in the landscapes of southern Brazil during the last glacial period if compared to the late Holocene, reflecting relatively colder and/or less humid climatic conditions. Patches of forest occurred in the lowlands and probably also on the exposed continental shelf that was mainly...

  18. Sedimentology of profile PS1824 at Gunnerus Ridge, Antarctica

    Maus, Bastian
    Das untersuchte Sedimentmaterial stammt aus dem westlich des Gunnerus-Rückens liegenden Tiefseebereich des Riiser-Larsenmeeres aus ca. 4480 m Wassertiefe. An den unverfestigten Sedimentkernproben eines etwa 13,40 m langen Schwerelotes (PS1824-1) und eines ca. 50 cm langen Großkastengreifers (PS1824-2) wurden umfangreiche sedimentphysikalische und sedimentologische Untersuchungsmethoden angewandt. Neben zerstörungsfreien, sedimentphysikalischen Messungen zur Ermittlung von Suszeptibilität, elektrischen Widerstand, P-Wellengeschwindigkeit und Feuchtraumdichte, wurden unter anderem die Korngrößenverteilung, der Karbonat- und Corg-Gehalt sowie die Komponentenverteilung der Sandfraktion bestimmt. Die zeitliche Einstufung basiert auf biostratigraphischen Datierungsmethoden mit Hilfe von Radiolarien und Diatomeen. Die untersuchten Sedimente umfassen demnach einen Ablagerungszeitraum vom Pliozän bis in das Holozän. Die Abfolgen...

  19. Allele matrix of 11 microsatellites in Plenaster craigi for 4 areas and 30 populations

    Taboada, Sergi; Riesgo, Ana; Wiklund, Helena; Paterson, Gordon L J; Koutsouveli, Vasiliki; Santodomingo, Nadia; Dale, Andrew C; Smith, Craig R; Jones, Daniel O B; Dahlgren, Thomas G; Glover, Adrian G
    The excel file has two spread-sheets: (i) "Microsatellites-4Areas" including the information of the 11 microsatellites used in the paper for the four different areas we investigated; (ii) "Microsatellites-30Populations" including the information of the 11 microsatellites used in the paper for the 30 different populations we investigated. In the two spread-sheets we include the following columns: "Number of individual" from 1 to 168; "Area" with the names of the areas or populations for every individual; "Sample Code" with the name of the sample used in the paper; "1Ple, 3Ple, 11Ple, 13Ple, 12Ple, 14Ple, 16Ple, 5Ple, 19Ple, 10Ple, and 2Ple" the name of...

  20. NanoSIMS data, 13C assimilation in the symbiotic dinoflagellates and their foraminiferal host (Orbulina universa)

    LeKieffre, Charlotte; Spero, Howard J; Russell, Ann D; Fehrenbacher, Jennifer; Geslin, Emmanuelle; Meibom, Anders
    Here we performed pulse-chase experiments with 13C-enriched dissolved inorganic carbon, followed by TEM and quantitative NanoSIMS isotopic imaging to visualize photosynthetic C assimilation by individual symbiotic dinoflagellates and subsequent translocation to their Orbulina universa host. NanoSIMS image processing was carried out as described in LeKieffre et al. (2017) and Nomaki et al. (2018). Briefly, TEM images were aligned with corresponding NanoSIMS 12C14N- images (Online Resource 1) using the software Look@NanoSIMS (Polerecky et al. 2012), which allows a user to hand-draw regions of interest (ROIs) corresponding to different organelles (e.g., dinoflagellate starch grains, foraminiferal lipid droplets, and fibrillar bodies). For each type...

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