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  • 2010-2014  (125)
  • 2005-2009  (11)
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  • 1
    In: Marine and petroleum geology, Amsterdam [u.a.] : Elsevier Science, 1984, (2009), 0264-8172
    In: year:2009
    In: extent:13
    Type of Medium: Online Resource
    Pages: 13 , Ill., garph. Darst
    ISSN: 0264-8172
    Language: English
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  • 2
    Keywords: Forschungsbericht ; Niger ; Deltasediment ; Tiefseebohrung ; Gashydrate
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (150 Seiten, 9,57 MB) , Illustrationen, Diagramme
    Language: German
    Note: Förderkennzeichen BMBF 03G0824A , Weiteren Autor dem Berichtsblatt entnommen , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Sprache der Zusammenfassung: Deutsch, Englisch
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  • 3
    Keywords: Datensammlung
    Description / Table of Contents: High-resolution sedimentary records of major and minor elements (Al, Ba, Ca, Sr, Ti), total organic carbon (TOC), and profiles of pore water constituents (SO42-, CH4, Ca2+, Ba2+, Mg2+, alkalinity) were obtained for two gravity cores (core 755, 501 m water depth and core 214, 1686 m water depth) from the northwestern Black Sea. The records were examined in order to gain insight into the cycling of Ba in anoxic marine sediments characterized by a shallow sulfate-methane transition (SMT) as well as the applicability of barite as a primary productivity proxy in such a setting. The Ba records are strongly overprinted by diagenetic barite (BaSO4) precipitation and remobilization; authigenic Ba enrichments were found at both sites at and slightly above the current SMT. Transport reaction modeling was applied to simulate the migration of the SMT during the changing geochemical conditions after the Holocene seawater intrusion into the Black Sea. Based on this, sediment intervals affected by diagenetic Ba redistribution were identified. Results reveal that the intense overprint of Ba and Baxs (Ba excess above detrital average) strongly limits its correlation to primary productivity. These findings have implications for other modern and ancient anoxic basins, such as sections covering the Oceanic Anoxic Events for which Ba is frequently used as a primary productivity indicator. Our study also demonstrates the limitations concerning the use of Baxs as a tracer for downward migrations of the SMT: due to high sedimentation rates at the investigated sites, diagenetic barite fronts are buried below the SMT within a relatively short period. Thus, 'relict' barite fronts would only be preserved for a few thousands of years, if at all.〈br〉〈br〉REFERENCE:〈br〉Blumenberg, Martin; Seifert, Richard; Kasten, Sabine; Bahlmann, E; Michaelis, Walter (2009): Euphotic zone bacterioplankton sources major bacteriohopanepolyols in the Holocene Black Sea. Geochimica et Cosmochimica Acta, 73(3), 750-766
    Type of Medium: Online Resource
    Pages: 4 Datasets , Format: application/zip
    Language: English
    Note: This dataset is supplement to doi:10.1016/j.gca.2012.04.021 , This dataset is cited by doi:10.1016/j.gca.2008.11.005
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  • 4
    Online Resource
    Online Resource
    Boston :BRILL,
    Keywords: Diptera-Variation. ; Diptera-Classification. ; Diptera-Geographical distribution. ; Electronic books.
    Description / Table of Contents: This is the first comprehensive synopsis of the biodiversity of Diptera, with chapters on all regional faunas, Diptera as ecological indicators, statistical techniques for estimating species diversity based on the known fauna, molecular tools and trends in digital publication.
    Type of Medium: Online Resource
    Pages: 1 online resource (479 pages)
    Edition: 1st ed.
    ISBN: 9789004181007
    DDC: 595.77
    Language: English
    Note: Intro -- Foreword (Quentin D. Wheeler) -- Contributors -- Section I: Regional Diversity of Diptera -- Chapter One. Nearctic Diptera: Twenty Years Later (F. Christian Thompson) -- Introduction -- Past -- Fauna -- Resources -- Research Program -- Summary -- Acknowledgements -- References -- Chapter Two. Hawaii's Dipt era Biodiversity (Neal L. Evenhuis) -- Introduction -- Part 1. Biogeography and Diversity of the Hawaiian Diptera Fauna -- Background -- Origin of the Hawaiian Fauna -- Diversity of the Hawaiian Diptera Fauna -- Biogeographic Affinities of the Hawaiian Diptera Fauna -- Threats to the Fauna -- Part 2. History and Future of Hawaiian Dipterology -- History of Collections -- Collecting Methods -- Inventorying the Data -- Future of Hawaiian Diptera Biodiversity -- Acknowledgements -- References -- Chapter Three. Neotropical Diptera Diversity: Richness, Patterns, and Perspectives (Dalton de Souza Amorim) -- Introduction -- Neotropical Region: Delimitation and Complexity -- Neotropical Diptera Richness -- Diptera Families Absent from or Poorly Represented in the Neotropical Region -- Endemic or Near-Endemic Families in the Neotropics -- Fossil Dipterans in the Neotropics -- Biogeographic Patterns in Neotropical Tropical Forests -- Highly Diverse Areas in the Neotropical Region -- Perspectives and Needs -- Acknowledgements -- References -- Chapter Four. Dipteran Biodiversity of the Galápagos (Bradley J. Sinclair) -- Introduction -- Part 1. Biogeography and Diversity of the Galápagos Diptera Fauna -- Physical Environment -- Origin of the Galápagos Fauna -- Diversity of the Galápagos Diptera Fauna -- Biogeographic Affinities of the Galápagos Diptera Fauna -- Threats to the Fauna -- Part 2. History and Future of Galápagos Dipterology -- History of Collections -- Collecting Methods -- Inventorying the Data. , Future of Dipteran Biodiversity of the Galápagos -- Acknowledgements -- References -- Chapter Five. Palaearctic Diptera - from Tundra to Desert (Thomas Pape) -- Introduction -- Geology and Biogeography -- Taxonomic History -- Total Estimated Fauna -- Special Features of the Fauna -- Collecting Palaearctic Diptera -- Means of Identification -- Recent Bioinformatics Initiatives -- Conservation -- Acknowledgements -- References -- Chapter Six. Afrotropical Diptera - Rich Savannas, Poor Rainforests (Ashley H. Kirk-Spriggs & -- Brian R. Stuckenberg) -- Introduction -- Extent of the Afrotropical Region -- South African Complexities -- Rostrum Elongation as a Notable Adaptation in the Diptera of the Cape Flora -- Namibia: Deserts and Arid Savannas -- The Rainforests -- Afromontane Biome -- Arid Coasts -- Savanna -- Madagascar -- Afrotropical Faunistics -- Estimate of Total Afrotropical Diptera Fauna -- Comparison to Other Zoogeographic Regions -- Endemic Afrotropical Families -- Some Absent Families -- Largest Afrotropical Families -- Least Known Families in the Afrotropics -- Notable Taxonomic Growth -- Best Known and Collected Countries -- Possible Gondwanan Elements in the Afrotropical Diptera -- Innovations in the Bioinventory of Africa's Diptera -- Acknowledgements -- References -- Chapter Seven. Oriental Diptera, a Challenge in Diversity and Taxonomy (Patrick Grootaert) -- Introduction -- Boundaries and a Few Definitions -- Origin of the Oriental Region -- Biomes -- History of Taxonomy in the Region -- Diversity and the Number of Species per Family -- Diversity and the Poor Sampling Effort: A Case Study of Elaphropeza (Empidoidea, Hybotidae) -- Hotspots -- Regional Diversity and Endemics -- Southeast Asia -- Biogeographical Patterns -- Circumtropical Species -- Disjunctive Distributions and Glaciations. , Mangroves, an Underestimated Source of Biodiversity -- General Conclusions and Challenges -- Acknowledgements -- References -- Chapter Eight. Diversity, Relationships and Biogeography of Australian Flies (David K. Yeates, Daniel Bickel, David K. McAlpine & -- Don H. Colless) -- Introduction -- The Australian Continent -- The Australian Fauna -- Total Estimated Fauna -- Special Features of the Fauna -- Biogeography -- Affinities and History of the Australian Diptera -- Ecological Biogeography of the Australian Fauna -- Ecological and Economic Importance -- Morphology and Behaviour -- Future Directions -- References -- Chapter Nine. Biogeography of Diptera in the Southwest Pacific (Daniel Bickel) -- Introduction -- General Regional Considerations -- Specific Regions -- Summary -- Acknowledgements -- References -- Section II : Diptera Biodiversity: Case Studies, Ecological Approaches and Estimation -- Chapter Ten. Why Hilara is not Amusing: the Problem of Open-Ended Taxa and the Limits of Taxonomic Knowledge (Daniel Bickel) -- Introduction -- Examples of Open-Ended Taxa in the Diptera -- Discussion -- Summary -- Acknowledgements -- References -- Chapter Eleven. Diptera as Ecological Indicators of Habitat and Habitat Change (Marc Pollet) -- Introduction -- Criteria -- Taxonomic Criteria -- Biogeographic Criteria -- Biological Criteria -- Logistic Criteria -- Sensitivity to Environmental Alterations -- How to Use Ecological Indicators in Nature Conservation? -- Discussion -- Acknowledgements -- References -- Chapter Twelve. Biodiversity Research Based on Taxonomic Revisions - A Tale of Unrealized Opportunities (Torsten Dikow, Rudolf Meier, Gaurav G. Vaidya & -- Jason G. H. Londt) -- Introduction -- Taxonomic Revisions: How Much Information is Available? -- Use of Specimen Data for Comparing the Biodiversity of ConservationAreas. , Use of Specimen Data for Proposing Red Lists -- Use of Specimen Data for Estimating Clade Species Richness -- Use of Specimen Data: The Numerous Problems -- Summary and Conclusions -- Acknowledgements -- References -- Section III : Bioinformatics and Dipteran Diversity -- Chapter Thirteen. DNA Barcoding and DNA Taxonomy in Diptera: An Assessment based on 4,261 COI S equences for 1,001 Species (Rudolf Meier & -- Guanyang Zhang) -- Introduction -- History: DNA Sequences in Diptera -- DNA Barcoding -- DNA Taxonomy -- Cost of a Molecular Taxonomy for Diptera -- The Need for an Integrative Taxonomy -- Conclusions -- References -- Chapter Fourteen. Diptera Biodiversity Informatics (Shaun L. Winterton) -- Introduction -- Databases: The Foundation of Informatics -- Digital Taxonomy -- Character Data and Matrices: Interactive Identification Tools -- Data Analyses -- Conclusions -- References -- Chapter Fifteen. Meeting the Interrelated Challenges of Tracking Specimen, Nomenclature, and Literature Data in Mandala (Gail E. Kampmeier & -- Michael E. Irwin) -- Preface -- Introduction -- Getting Started with Mandala -- Enter Specimen Information -- Interpret and Standardize Locality and Collecting Event Data -- Trace Nomenclatural History -- Track Loans -- Illustrations -- Record & -- Dissect Taxonomic Literature -- Querying Mandala -- Special Features -- Future Plans for Mandala -- Acknowledgements -- References -- Appendix -- Alphabetical Listing of Tables & -- their Purpose in Mandala -- Appendix. Species of Diptera per family for all regions -- Index.
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  • 5
    Online Resource
    Online Resource
    Sofia :Pensoft Publishers,
    Keywords: Sarcophaga-France. ; Sarcophagidae-France. ; Diptera-France. ; Electronic books.
    Description / Table of Contents: identification keys, b/w tabs, rich bibliography, b/w plates.
    Type of Medium: Online Resource
    Pages: 1 online resource (330 pages)
    Edition: 1st ed.
    ISBN: 9789546425881
    Series Statement: Pensoft Series Faunistica ; v.97
    DDC: 505
    Language: English
    Note: Intro -- CONTENTS -- Abbreviations used in the text, Figures and Plates -- Introduction -- Taxonomy and nomenclat ure -- List of species found in France -- Morphology -- Techniques -- Biology of the species -- Collecting -- LOCALITY DATA -- Distribution -- Conservation Status -- Keys for identification -- Locality records for Sarcophaga spp.in France -- Acknowledgments -- References -- Figures -- Plates -- Index to species in the Plates.
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  • 6
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    Wiley / Society for Applied Microbiology and Blackwell Publishing Ltd,
    In:  Environmental Microbiology, 8 (7). pp. 1220-1227.
    Publication Date: 2017-06-28
    Description: Sulfate reduction accounts for about a half of the remineralization of organic carbon in anoxic marine shelf regions. Moreover, it was already a major microbial process in the very early ocean at least 2.4 billion years before the present. Here we demonstrate for the first time the capability of sulfate-reducing bacteria (SRB) to biosynthesize hopanoids, compounds that are quantitatively important and widely distributed biomarkers in recent and fossil sediments dating back to the late Archean. We found high concentrations (9.8–12.3 mg per gram of dry cells) of non-extended and extended bacteriohopanoids (bacteriohopanetetrol, aminobacteriohopanetriol, aminobacteriohopanetetrol) in pure cultures of SRB belonging to the widely distributed genus Desulfovibrio. Biohopanoids were found – considered as membrane rigidifiers – in more than 50% of bacterial species analysed so far. However, their biosynthesis appeared to be restricted to aerobes or facultative anaerobes with a very few recently described exceptions. Consequently, findings of sedimentary hopanoids are often used as indication for oxygenated settings. Nevertheless, our findings shed new light on the presence of hopanoids in specific anoxic settings and suggests that SRB are substantial sources of this quantitatively important lipid class in recent but also past anoxic environments.
    Type: Article , PeerReviewed
    Format: text
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  • 7
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    Elsevier
    In:  Palaeogeography Palaeoclimatology Palaeoecology, 227 (1-3). pp. 31-47.
    Publication Date: 2017-06-30
    Description: Carbonates recovered from anoxic waters between 235 and 1555 m depth in the northwestern Black Sea were analyzed for lipid biomarkers and stable carbon isotopic compositions. In addition, a methane-seep-related microbial mat and a sample of surface sediment recovered from a non-seep site were studied for comparison. High concentrations of strongly 13C-depleted lipids attributed to bacteria and archaea mediating the anaerobic oxidation of methane (AOM) were found in all samples except for the sediment. Differences of the dominant AOM-performing communities between the carbonates indicated by specific lipid patterns appear to be caused by the respective biogeochemical settings. High proportions of ANME-2 consortia are found at sites of assumingly high partial pressures of methane while ANME-1 associations dominate at locations of moderate methane supply. In the sedimentary concretion, a complex mixture of biomarkers for terrestrial and planktonic organisms was found. Different molecular structures along with strong variations in the stable carbon isotopic compositions (δ13C = − 20.2‰ to − 94.3‰) allow for an estimation of the proportions of tetraether-bound biphytanes derived from planktonic Crenarchaeota and methanotrophic Euryarchaeota. Our data imply that the shape of AOM-derived carbonate precipitates in Black Sea environments is crucially influenced by the respective methane supply. Active AOM-driven chimney-like bioherms, similar to those previously observed on the Ukrainian shelf, might also develop in the deep euxinic zone at 1555 m water depths.
    Type: Article , PeerReviewed
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  • 8
    Publication Date: 2013-12-19
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 9
    Publication Date: 2019-09-23
    Description: Detailed knowledge of the extent of post-genetic modifications affecting shallow submarine hydrocarbons fueled from the deep subsurface is fundamental for evaluating source and reservoir properties. We investigated gases from a submarine high-flux seepage site in the anoxic Eastern Black Sea in order to elucidate molecular and isotopic alterations of low-molecular-weight hydrocarbons (LMWHC) associated with upward migration through the sediment and precipitation of shallow gas hydrates. For this, near-surface sediment pressure cores and free gas venting from the seafloor were collected using autoclave technology at the Batumi seep area at 845 m water depth within the gas hydrate stability zone. Vent gas, gas from pressure core degassing, and from hydrate dissociation were strongly dominated by methane (〉 99.85 mol.% of ∑[C1–C4, CO2]). Molecular ratios of LMWHC (C1/[C2 + C3] 〉 1000) and stable isotopic compositions of methane (δ13C = − 53.5‰ V-PDB; D/H around − 175‰ SMOW) indicated predominant microbial methane formation. C1/C2+ ratios and stable isotopic compositions of LMWHC distinguished three gas types prevailing in the seepage area. Vent gas discharged into bottom waters was depleted in methane by 〉 0.03 mol.% (∑[C1–C4, CO2]) relative to the other gas types and the virtual lack of 14C–CH4 indicated a negligible input of methane from degradation of fresh organic matter. Of all gas types analyzed, vent gas was least affected by molecular fractionation, thus, its origin from the deep subsurface rather than from decomposing hydrates in near-surface sediments is likely. As a result of the anaerobic oxidation of methane, LMWHC in pressure cores in top sediments included smaller methane fractions [0.03 mol.% ∑(C1–C4, CO2)] than gas released from pressure cores of more deeply buried sediments, where the fraction of methane was maximal due to its preferential incorporation in hydrate lattices. No indications for stable carbon isotopic fractionations of methane during hydrate crystallization from vent gas were found. Enrichments of 14C–CH4 (1.4 pMC) in short cores relative to lower abundances (max. 0.6 pMC) in gas from long cores and gas hydrates substantiates recent methanogenesis utilizing modern organic matter deposited in top sediments of this high-flux hydrocarbon seep area.
    Type: Article , PeerReviewed
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  • 10
    Publication Date: 2013-12-19
    Type: Conference or Workshop Item , NonPeerReviewed
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