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  • 1
    Electronic Resource
    Electronic Resource
    Biosynthetic origins and assignments of carbon 13 NMR peaks of brevetoxin B (1986)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 108 (1986), S. 7855-7856 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00284a072
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A major biopolymeric component to dissolved organic carbon in surface sea water (1997)
    [s.l.] : Nature Publishing Group
    Nature 387 (1997), S. 166-169 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Between 25% and 35% of marine DOC is in a high-molecular-weight fraction that can be recovered by ultrafiltration or dialysis8"10. Using these techniques, organic matter was sampled at sites in the Atlantic and eastern tropical Pacific oceans (Table 1). Proton NMR of ultrafiltered dissolved organic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/387166a0
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Carotenoid transformations in coastal marine waters (1982)
    [s.l.] : Nature Publishing Group
    Nature 295 (1982), S. 51-54 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sediment traps were deployed in Buzzards Bay, Massachusetts (4132'N, 7042'W) for two 30-day periods between 20 May and 23 July 1980. Traps were set 4 m below the surface in a 10-m water column. Collected material was filtered and sonic-extracted with methanol (twice, 20min each) and dichloromethane ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/295051a0
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    Paper (German National Licenses)
    Fulltext
  • 4
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    Juveniles of the Atlantic coral, Favia fragum (Esper, 1797) do not invest energy to maintain calcification under ocean acidification (2018)
    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 507 . pp. 61-69.
    Details
    Publication Date: 2018-12-17
    Description: Ocean acidification (OA) threatens coral reef ecosystems by slowing calcification and enhancing dissolution of calcifying organisms and sediments. Nevertheless, multiple factors have been shown to modulate OA's impact on calcification, including the nutritional status of the coral host. In three separate experiments, we exposed juveniles of the Atlantic golf ball coral, Favia fragum, to elevated CO2 and varied nutritional (light or feeding) conditions. Juveniles reared from planulae larvae were significantly larger and produced more CaCO3 when fed, regardless of CO2 level. However, corals subjected to elevated CO2 produced less CaCO3 per mm2 regardless of feeding condition. Additionally, unfed corals reared under elevated light levels exhibited lower chlorophyll a and higher total lipid content, but light had no significant effect on coral calcification. Conversely, elevated CO2 had a significant, negative affect on calcification, regardless of light condition but no detectable effect on physiological tissue parameters. Our results indicate that the sensitivity of juvenile F. fragum calcification to OA was neither modulated by light nor by feeding, despite physiological indications of enhanced nutritional status. This suggests that corals do not necessarily divert energy to maintain calcification under high CO2, even when they have the energetic resources to do so.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.jembe.2018.07.007
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    The MAREDAT global database of high performance liquid chromatography marine pigment measurements - Gridded data product (NetCDF) - Contribution to the MAREDAT World Ocean Atlas of Plankton Functional Types (2013)
    PANGAEA
    Details
    Publication Date: 2023-03-27
    Keywords: MAREMIP; MARine Ecosystem Model Intercomparison Project
    Type: Dataset
    Format: application/zip, 8.5 MBytes
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    DATA PANGAEA
  • 6
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    A multi-proxy investigation of sediment core GeoB7165-1 and AMS 14C dating points from sediment cores off Conceptión (~ 36°S) (2010)
    PANGAEA
    In:  Supplement to: Mohtadi, Mahyar; Rossel, Pamela E; Lange, Carina Beatriz; Pantoja, Silvio; Böning, Philipp; Repeta, Daniel J; Grunwald, Maik; Lamy, Frank; Hebbeln, Dierk; Brumsack, Hans-Jürgen (2008): Deglacial pattern of circulation and marine productivity in the upwelling region off central-south Chile. Earth and Planetary Science Letters, 272, 221-230, https://doi.org/10.1016/j.epsl.2008.04.043
    Details
    Publication Date: 2023-12-09
    Description: A high-resolution sea surface temperature and paleoproductivity reconstruction on a sedimentary record collected at 36°S off central-south Chile (GeoB 7165-1, 36°33'S, 73°40'W, 797 m water depth, core length 750 cm) indicates that paleoceanographic conditions changed abruptly between 18 and 17 ka. Comparative analysis of several cores along the Chilean continental margin (30°-41°S) suggests that the onset and the pattern of deglacial warming was not uniform off central-south Chile due to the progressive southward migration of the Southern Westerlies and local variations in upwelling. Marine productivity augmented rather abruptly at 13-14 ka, well after the oceanographic changes.We suggest that the late deglacial increase in paleoproductivity off central-south Chile reflects the onset of an active upwelling system bringing nutrient-rich, oxygen-poor Equatorial SubsurfaceWater to the euphotic zone, and a relatively higher nutrient load of the Antarctic Circumpolar Current. During the Last Glacial Maximum, when the Southern Westerlies were located further north, productivity off central-south Chile, in contrast to off northern Chile, was reduced due to direct onshore-blowing winds that prevented coastal upwelling and export production.
    Keywords: Center for Marine Environmental Sciences; CHIPAL; CONDOR-Ia; East Pacific; GeoB3302-1; GeoB3359-3; GeoB7139-2; GeoB7165-1; GIK17748-2; Gravity corer (Kiel type); HOTLINE, HYGAPE; MARUM; off Chile; PUCK; SL; SO101; SO101/3_2-1; SO102/1; SO156/2; SO156/3; SO80_4; SO80a; Sonne; South-East Pacific
    Type: Dataset
    Format: application/zip, 6 datasets
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    DATA PANGAEA
  • 7
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    Concentrations of beta-carotene, astaxanthin, canthaxanthin, and diatoxanthine of ODP Leg 112 samples (Table 2) (1990)
    PANGAEA
    In:  Supplement to: Repeta, Daniel J (1990): Carotenoid diagenesis in Pleistocene to Miocene sediments from the Peru Margin. In: Suess, E; von Huene, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 112, 567-572, https://doi.org/10.2973/odp.proc.sr.112.157.1990
    Details
    Publication Date: 2024-01-09
    Description: The quantitative distribution of carotenoids in sediments of Pleistocene to Miocene age from the Peru upwelling area is reported. Major pigments include beta-carotene, diatoxanthin, caroteno-3,3'-diols from phytoplankton, astaxanthin and canthaxanthin from crustaceans, and spheroidenone from bacteria. beta-carotene epoxides are major consituents, representing transformation products in the degradation of beta-carotene to low molecular weight compounds. The absolute abundance of carotenoids reflects bottom-water oxicity at the time of deposition; highest concentrations of carotenoids were observed in laminated muds deposited within the oxygen-minimum zone, with reduced or negligible concentrations of pigments observed in bioturbated sequences deposited during periods of well-oxygenated bottom water. beta-carotene, the most abundant pigment in recently deposited sediments, slowly degrades through a sequence of transformation reactions initiated by epoxidation. The 4,4' dioxo-carotenoids, which are unable to form 5,6-epoxides, have been preferentially preserved in these sediments.
    Keywords: 112-679C; 112-681C; 112-684C; Astaxanthin per unit sediment mass; beta-Carotene, beta,beta-Carotene per unit sediment mass; Canthaxanthin per unit sediment mass; Diatoxanthin per unit sediment mass; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg112; Ocean Drilling Program; ODP; Sample code/label; Sample mass; South Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 85 data points
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    DATA PANGAEA
  • 8
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    Understanding the role of the Biological Pump in the Global Carbon Cycle: An imperative for Ocean Science. (2014)
    Oceanography Society
    In:  EPIC3Oceanography, Oceanography Society, 27(3), pp. 10-16, ISSN: 1042-8275
    Details
    Publication Date: 2014-10-14
    Description: Anthropogenically driven climate change will rapidly become Earth's dominant transformative influence in the coming decades. The oceanic biological pump—the complex suite of processes that results in the transfer of particulate and dissolved organic carbon from the surface to the deep ocean—constitutes the main mechanism for removing CO2 from the atmosphere and sequestering carbon at depth on submillennium time scales. Variations in the efficacy of the biological pump and the strength of the deep ocean carbon sink, which is larger than all other bioactive carbon reservoirs, regulate Earth's climate and have been implicated in past glacial-​interglacial cycles. The numerous biological, chemical, and physical processes involved in the biological pump are inextricably linked and heterogeneous over a wide range of spatial and temporal scales, and they influence virtually the entire ocean ecosystem. Thus, the functioning of the oceanic biological pump is not only relevant to the modulation of Earth's climate but also constitutes the basis for marine biodiversity and key food resources that support the human population. Our understanding of the biological pump is far from complete. Moreover, how the biological pump and the deep ocean carbon sink will respond to the rapid and ongoing anthropogenic changes to our planet—including warming, acidification, and deoxygenation of ocean waters—remains highly uncertain. To understand and quantify present-day and future changes in biological pump processes requires sustained global observations coupled with extensive modeling studies supported by international scientific coordination and funding
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 9
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    Characterization of methyl sugars, 3-deoxysugars and methyl deoxysugars in marine high molecular weight dissolved organic matter (2007)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Elsevier B.V., 2007. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Organic Geochemistry 38 (2007): 884-896, doi:10.1016/j.orggeochem.2007.02.005.
    Description: Nuclear magnetic resonance spectroscopy of marine high molecular weight dissolved organic matter (HMWDOM) in surface waters show that 〉50% of the carbon is a compositionally well-defined family of acylated-polysaccharides that are conserved across ocean basins. However, acid hydrolysis of HMWDOM followed by chromatographic analyses recover only 10-20% of the carbon as neutral, amino, and acidic sugars. Most carbohydrate in HMWDOM therefore remains uncharacterized. Here we use acid hydrolysis followed by Ag+ and Pb2+ cation exchange chromatography to separate HMWDOM hydrolysis products for characterization by 1-D and 2-D NMR spectroscopy. In addition to neutral sugars identified in past studies, we find 3-Omethylglucose, 3-O-methylrhamnose, 2-O-methylrhamnose and 2-O-methylfucose. We also find 3-deoxysugars to be present, although their complete structures could not be determined. Methyl sugars are widely distributed in plant and bacterial structural carbohydrates, such as cell wall polysaccharides, and their presence in HMWDOM suggests that structural carbohydrates may contribute to DOM in surface seawater. We find most HMWDOM carbohydrate is not depolymerized by acid hydrolysis, and that the nonhydrolyzable component includes 6-deoxysugars.
    Description: Funding was provided by the Ocean Carbon Sequestration Research Program, Biological and Environmental Research (BER), U.S. Department of Energy grant DEFG0200ER62999 and the National Sciences Foundation Chemical Oceanography Program grant OCE 9818654. Christos Panagiotopoulos received support through the Postdoctoral Fellowship Program of the Woods Hole Oceanographic Institution, and DJR received support through the Stanley Watson Chair in Oceanography.
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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    PAPER (OA)
  • 10
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    Transformations of carotenoids in the oceanic water column (2008)
    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution August 1982
    Description: In an effort to understand the more general mechanisms and rates of pre-depositional reactions that transform organic matter, the types and relevant time scales of reactions that transform carotenoid pigments in the oceanic water column were studied. Suspended particulate matter collected from surface waters of Buzzards Bay, Massachusetts and the Peru upwelling system has a carotenoid distribution reflecting the phytoplanktonic source of the material. The carotenoid distribution of sediment trap samples collected in these same areas was dominated by transformation products. Fucoxanthin, the primary carotenoid of marine diatoms, typically constituted 77-100% of the total fucopigments in suspended particulate material. In sediment trap samples this pigment constituted only 4-85% of the total. The remaining 15-96% of the pigments consisted of the fucoxanthin transformations products: free alcohols (2-94%), dehydrates (0-6%), and opened epoxides (0-19%). Preliminary results suggest that carotenoid esters are hydrolyzed to free alcohols at a rate determined by the turnover of primary productivity. The dehydrated and epoxide opened intermediates of fucoxanthin represent products of transformation reactions that operate over much longer time scales (0.1-10 yrs). Dehydration and epoxide opening are not significant water column transformations, but are important in surface sediments.
    Description: This research was supported by the Ocean Sciences Section, National Science Foundation grants OCE 79-25352 and OCE 81-18436, the Office of Naval Research Contract N00014-74-Co-262NR 083-004, the Woods Hole Coastal Research Center project 25 000067 04, and a Woods Hole Oceanographic Institution Student Fellowship.
    Keywords: Carotenoids ; Phytoplankton ; Marine sediments ; Atlantis II (Ship : 1963-) Cruise AII108-3
    Repository Name: Woods Hole Open Access Server
    Type: Thesis
    Format: application/pdf
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    PAPER (OA)
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