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  1. Article ; Online: Cyclic antimicrobial R-, W-rich peptides: the role of peptide structure and E. coli outer and inner membranes in activity and the mode of action.

    Junkes, Christof / Harvey, Richard D / Bruce, Kenneth D / Dölling, Rudolf / Bagheri, Mojtaba / Dathe, Margitta

    European biophysics journal : EBJ

    2011  Volume 40, Issue 4, Page(s) 515–528

    Abstract: This study compares the effect of cyclic R-, W-rich peptides with variations ... A-, rough-LPS (r-LPS)- and smooth-LPS (s-LPS)-doped POPC liposomes demonstrated the decisive role of O ...

    Abstract This study compares the effect of cyclic R-, W-rich peptides with variations in amino acid sequences and sizes from 5 to 12 residues upon Gram negative and Gram positive bacteria as well as outer membrane-deficient and LPS mutant Escherichia coli (E. coli) strains to analyze the structural determinants of peptide activity. Cyclo-RRRWFW (c-WFW) was the most active and E. coli-selective sequence and bactericidal at the minimal inhibitory concentration (MIC). Removal of the outer membrane distinctly reduced peptide activity and the complete smooth LPS was required for maximal activity. c-WFW efficiently permeabilised the outer membrane of E. coli and promoted outer membrane substrate transport. Isothermal titration calorimetric studies with lipid A-, rough-LPS (r-LPS)- and smooth-LPS (s-LPS)-doped POPC liposomes demonstrated the decisive role of O-antigen and outer core polysaccharides for peptide binding and partitioning. Peptide activity against the inner E. coli membrane (IM) was very low. Even at a peptide to lipid ratio of 8/1, c-WFW was not able to permeabilise a phosphatidylglycerol/phosphatidylethanolamine (POPG/POPE) bilayer. Low influx of propidium iodide (PI) into bacteria confirmed a low permeabilising ability of c-WFW against PE-rich membranes at the MIC. Whilst the peptide effect upon eukaryotic cells correlated with the amphipathicity and permeabilisation of neutral phosphatidylcholine bilayers, suggesting a membrane disturbing mode of action, membrane permeabilisation does not seem to be the dominating antimicrobial mechanism of c-WFW. Peptide interactions with the LPS sugar moieties certainly modulate the transport across the outer membrane and are the basis of the E. coli selectivity of this type of peptides.
    MeSH term(s) Amino Acid Sequence ; Anti-Infective Agents/chemistry ; Anti-Infective Agents/pharmacology ; Calorimetry ; Cell Membrane/chemistry ; Cell Membrane/drug effects ; Cell Membrane/metabolism ; Cell Membrane Permeability/drug effects ; Chromatography, High Pressure Liquid ; Circular Dichroism ; Escherichia coli/chemistry ; Escherichia coli/metabolism ; Eukaryotic Cells/chemistry ; Eukaryotic Cells/metabolism ; Lipopolysaccharides/chemistry ; Lipopolysaccharides/metabolism ; Liposomes/chemistry ; Liposomes/metabolism ; Microbial Sensitivity Tests ; Molecular Sequence Data ; Peptides, Cyclic/chemistry ; Peptides, Cyclic/pharmacology ; Phosphatidylethanolamines/chemistry ; Phosphatidylethanolamines/metabolism ; Phosphatidylglycerols/chemistry ; Phosphatidylglycerols/metabolism
    Chemical Substances Anti-Infective Agents ; Lipopolysaccharides ; Liposomes ; Peptides, Cyclic ; Phosphatidylethanolamines ; Phosphatidylglycerols ; 1-palmitoyl-2-oleoylphosphatidylethanolamine (10015-88-0)
    Language English
    Publishing date 2011-02-01
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 283671-3
    ISSN 1432-1017 ; 0175-7571
    ISSN (online) 1432-1017
    ISSN 0175-7571
    DOI 10.1007/s00249-011-0671-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online ; E-Book: Emery and Rimoin's principles and practice of medical genetics and genomics

    Pyeritz, Reed E. / Korf, Bruce R. / Grody, Wayne W.

    hematologic, renal, and immunologic disorders

    2023  

    Abstract: Emery and Rimoin's Principles and Practice of Medical Genetics and Genomics: Hematologic, Renal, and Immunologic Disorders, Seventh Edition thoroughly examines medical genetics and genomics as applied to hematologic, immunologic and endocrinologic ... ...

    Title variant Principles and practice of medical genetics and genomics ; Hematologic, renal, and immunologic disorders
    Author's details edited by Reed E. Pyeritz, Bruce R. Korf, Wayne W. Grody
    Abstract Emery and Rimoin's Principles and Practice of Medical Genetics and Genomics: Hematologic, Renal, and Immunologic Disorders, Seventh Edition thoroughly examines medical genetics and genomics as applied to hematologic, immunologic and endocrinologic disorders, with an emphasis on understanding the genetic mechanisms underlying these conditions, diagnostic approaches, and treatment methods. Here, genetic researchers, students and health professionals will find new and fully revised chapters on the genetics of red blood cell diseases, rhesus and other fetomaternal incompatibilities, immunodeficiency disorders, inherited complement deficiencies, celiac disease, and diabetes mellitus, as well as thyroid, parathyroid and gonad disorders, among other conditions.
    MeSH term(s) Genetics, Medical ; Genetic Diseases, Inborn ; Genomics
    Keywords Medical genetics ; Genetic disorders ; Genomics
    Subject code 616.042
    Language English
    Size 1 online resource (xiii, 367 pages) :, illustrations
    Edition Seventh edition.
    Publisher Academic Press
    Publishing place London, England
    Document type Book ; Online ; E-Book
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    ISBN 0-12-812682-5 ; 0-12-812534-9 ; 978-0-12-812682-0 ; 978-0-12-812534-2
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  3. Book ; Online: Pliocene/Pleistocene benthic foraminiferal abundances from six drilling cores, supplementary data to: Hayward, Bruce W; Kawagata, Shungo; Grenfell, Hugh R; Sabaa, Ashwaq T; O'Neill, Tanya (2007): Last global extinction in the deep sea during the mid-Pleistocene climate transition. Paleoceanography, 22, PA3103

    Hayward, Bruce W / Grenfell, Hugh R / Kawagata, Shungo / O'Neill, Tanya / Sabaa, Ashwaq T

    2007  

    Abstract: Twenty percent (19 genera, 95 species) of cosmopolitan, deep-sea (500-4000 m), benthic foraminiferal species became extinct during the late Pliocene-Middle Pleistocene (3-0.12 Ma), with the peak of extinctions (76 species) occurring during the mid- ... ...

    Abstract Twenty percent (19 genera, 95 species) of cosmopolitan, deep-sea (500-4000 m), benthic foraminiferal species became extinct during the late Pliocene-Middle Pleistocene (3-0.12 Ma), with the peak of extinctions (76 species) occurring during the mid-Pleistocene Climate Transition (MPT, 1.2-0.55 Ma). One whole family (Stilostomellidae, 30 species) was wiped out, and a second (Pleurostomellidae, 29 species) was decimated with just one species possibly surviving through to the present. Our studies at 21 deep-sea core sites show widespread pulsed declines in abundance and diversity of the extinction group species during more extreme glacials, with partial interglacial recoveries. These declines started in the late Pliocene in southern sourced deep water masses (Antarctic Bottom Water, Circumpolar Deep Water) and extending into intermediate waters (Antarctic Intermediate Water, North Atlantic Deep Water) in the MPT, with the youngest declines in sites farthest downstream from high-latitude source areas for intermediate waters. We infer that the unusual apertural types that were targeted by this extinction period were adaptations for a specific kind of food source and that it was probably the demise of this microbial food that resulted in the foraminiferal extinctions. We hypothesize that it may have been increased cold and oxygenation of the southern sourced deep water masses that impacted on this deep water microbial food source during major late Pliocene and Early Pleistocene glacials when Antarctic ice was substantially expanded. The food source in intermediate water was not impacted until major glacials in the MPT when there were significant expansion of polar sea ice in both hemispheres and major changes in the source areas, temperature, and oxygenation of global intermediate waters.
    Language English
    Dates of publication 2007-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1029/2007PA001424
    DOI 10.1594/PANGAEA.746497
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  4. Book ; Online ; E-Book: Emery and Rimoin's principles and practice of medical genetics and genomics

    Pyeritz, Reed E. / Korf, Bruce R. / Grody, Wayne W.

    perinatal and reproductive genetics

    2022  

    Title variant Principles and practice of medical genetics and genomics
    Author's details edited by Reed E. Pyeritz, Bruce R. Korf, Wayne W. Grody
    Keywords Electronic books
    Language English
    Size 1 Online-Ressource (xiii, 304 Seiten), Illustrationen, Diagramme
    Edition Seventh edition
    Publisher Elsevier
    Publishing place London
    Publishing country Great Britain
    Document type Book ; Online ; E-Book
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    HBZ-ID HT021227237
    ISBN 978-0-12-815237-9 ; 9780128152362 ; 0-12-815237-0 ; 0128152362
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  5. Book ; Online: Benthic foraminifera of Mediterranean deep-sea sediments, supplementary data to: Hayward, Bruce W; Sabaa, Ashwaq T; Kawagata, Shungo; Grenfell, Hugh R (2009): The Early Pliocene re-colonisation of the deep Mediterranean Sea by benthic foraminifera and their pulsed Late Pliocene-Middle Pleistocene decline. Marine Micropaleontology, 71(3-4), 97-112

    Hayward, Bruce W / Grenfell, Hugh R / Kawagata, Shungo / Sabaa, Ashwaq T

    2009  

    Abstract: Ninety-five species and 19 genera of cosmopolitan, deep-sea benthic foraminifera belonging to the families Pleurostomellidae, Stilostomellidae and Nodosariidae, became extinct during the Late Pliocene-Middle Pleistocene. Only 50% of these (44 species) ... ...

    Abstract Ninety-five species and 19 genera of cosmopolitan, deep-sea benthic foraminifera belonging to the families Pleurostomellidae, Stilostomellidae and Nodosariidae, became extinct during the Late Pliocene-Middle Pleistocene. Only 50% of these (44 species) were present in the Pliocene or Pleistocene of the deep Mediterranean Sea (ODP Sites 654, 966, 967, 975, 976), being those which had successfully migrated in via the Strait of Gibraltar from the deep Atlantic following the annihilation of the Mediterranean deep-sea fauna during the Late Miocene Messinian Crisis. Most colonisation occurred within the first 0.8 myrs (5.3-4.5 Ma) after re-establishment of the Mediterranean-Atlantic link, with possibly a second lesser period of immigration in the Late Pliocene (3.4-3.0 Ma). We infer that colonisations may have been fortuitous and few in number, as some common members of the group in the Atlantic never succeeded in establishing in the Mediterranean Sea. There is no evidence of any new immigration events during the Pleistocene, implying that the present anti-estuarine circulation may have been in place throughout this period. Our studies suggest that these deep-water, low-oxygen-tolerant foraminifera survived the many periods of deep-water sapropel formation in the Pliocene-Early Pleistocene, possibly in somewhat shallower (~ 500 m) refuges with dysoxic, rather than anoxic conditions.
    The Pliocene-Pleistocene stratigraphic record of this group of elongate, cylindrical benthic foraminifera with constricted and specialised apertures is similar in the west and east Mediterranean basins. The group declined in abundance (flux) and diversity in two pulses, during the Late Pliocene (3.1-2.7 Ma) and the late Early Pleistocene (1.3-1.0 Ma) in concert with global, southern-sourced, deep-water sites (AABW, CPDW) and earlier than the single decline (1.0-0.6 Ma) in global, intermediate water sites (uNADW, AAIW). All species, with one possible exception, disappeared earlier in the Mediterranean than globally. The highest occurrence of any species of this group in Mediterranean sites was 0.8-0.43 Ma, comparable with 0.7-0.2 Ma outside with the youngest survivors being in abyssal, deep-water.
    Thus, despite the unusual oceanographic conditions and isolation, the deep Mediterranean Sea was in this case neither the centre for the evolution of new species nor a refuge where species survived after they had disappeared elsewhere.
    Language English
    Dates of publication 2009-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1016/j.marmicro.2009.01.008
    DOI 10.1594/PANGAEA.773782
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  6. Book ; Online ; E-Book: Emery and Rimoin's principles and practice of medical genetics and genomics / Metabolic disorders /

    Pyeritz, Reed E. / Korf, Bruce R. / Grody, Wayne W.

    2021  

    Abstract: With nearly 5,000 pages of detailed coverage, contributions from over 250 of the world’s most trusted authorities in medical genetics, and a series of 11 volumes available for individual sale, the Seventh Edition of this classic reference includes the ... ...

    Author's details edited by Reed E. Pyeritz, Bruce R. Korf, Wayne W. Grody
    Abstract "With nearly 5,000 pages of detailed coverage, contributions from over 250 of the world’s most trusted authorities in medical genetics, and a series of 11 volumes available for individual sale, the Seventh Edition of this classic reference includes the latest information on seminal topics such as prenatal diagnosis, genome and exome sequencing, public health genetics, genetic counseling, and management and treatment strategies to complete its coverage of this growing field for medical students, residents, physicians, and researchers involved in the care of patients with genetic conditions. This comprehensive yet practical resource emphasizes theory and research fundamentals related to applications of medical genetics across the full spectrum of inherited disorders and applications to medicine more broadly.
    Keywords Medical genetics
    Subject code 616.042
    Language English
    Size 1 online resource (xiii, 737 pages) :, illustrations (chiefly color)
    Edition Seventh edition.
    Publisher Academic Press
    Publishing place London, England
    Document type Book ; Online ; E-Book
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    ISBN 0-12-812683-3 ; 0-12-812535-7 ; 978-0-12-812683-7 ; 978-0-12-812535-9
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  7. Book ; Online: Benthic foraminifera groups of ODP Site 162-982, supplementary data to: Kawagata, Shungo; Hayward, Bruce W; Grenfell, Hugh R; Sabaa, Ashwaq T (2005): Mid-Pleistocene extinction of deep-sea foraminifera in the North Atlantic Gateway (ODP sites 980 and 982). Palaeogeography, Palaeoclimatology, Palaeoecology, 221(3-4), 267-291

    Kawagata, Shungo / Grenfell, Hugh R / Hayward, Bruce W / Sabaa, Ashwaq T

    2005  

    Abstract: ... to increasing chemical ventilation of glacial intermediate water.

    REFERENCE:
    Hayward, Bruce W; Johnson ... This is supported by our study where there is a strong positive correlation (r = ~+ 0.8) between the flux ...

    Abstract The pulsed decline and eventual extinction of 51 species of elongate, cylindrical deep-sea benthic foraminifera (Stilostomellidae, Pleurostomellidae, and some Nodosariidae) occurred at intermediate water depths (1145-2168 m, Sites 980 and 982) in the northern North Atlantic during the mid-Pleistocene transition (MPT, 1.2-0.6 Ma). In the early Pleistocene, prior to their disappearance, these species comprised up to 20% of the total abundance of the benthic foraminiferal assemblage at 2168 m, but up to only 2% at 1145 m. The MPT extinction of 51 species represents ?20% of the total benthic foraminiferal diversity at bathyal depths in the North Atlantic (excluding the myriad of small unilocular forms). The extinction rate during the MPT was approximately 10 species per 0.1 myr, being one or two orders of magnitude greater than normal background turnover rates of deep-sea benthic foraminifera. Comparison of the precise timings of declines and disappearances (= highest occurrences) of each species shows that they were often diachronous between the two depths. The last of these species to disappear in the North Atlantic was Pleurostomella alternans at ~0.679 and ~0.694 Ma in Sites 980 and 982, respectively, which is in good agreement with the previously documented global "Stilostomella extinction" datum within the period 0.7-0.58 Ma. Comparison with similar studies in intermediate depth waters in the Southwest Pacific Gateway indicates that ~61% of the extinct species were common to both regions, and that although the pattern of pulsed decline was similar, the precise order and timing of the extinction of individual species were mostly different on opposite sides of the world. Previous studies have indicated that this extinct group of elongate, cylindrical foraminifera lived infaunally and had their greatest abundances in poorly ventilated, lower oxygen environments. This is supported by our study where there is a strong positive correlation (r = ~+ 0.8) between the flux of the extinction group and low-oxygen/high organic input species (such as Uvigerina, Bulimina and Bolivina) during the MPT, suggesting a close relationship with lower oxygen levels and high food supply to the sea floor. The absolute abundance, flux, and number of the extinction group of species show a progressive withdrawal pattern with major decreases occurring in cold periods with high d13C values. This might be related to increasing chemical ventilation of glacial intermediate water.

    REFERENCE:
    Hayward, Bruce W; Johnson, Katherine; Sabaa, Ashwaq T; Kawagata, Shungo; Thomas, Ellen (2010): Cenozoic record of elongate, cylindrical, deep-sea benthic foraminifera in the North Atlantic and equatorial Pacific Oceans. Marine Micropaleontology, 74(3-4), 75-95
    Language English
    Dates of publication 2005-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is cited by doi:10.1016/j.marmicro.2010.01.001 ; This dataset is supplement to doi:10.1016/j.palaeo.2005.03.001
    DOI 10.1594/PANGAEA.774885
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  8. Book ; Online: Mid-Pleistocene benthic foraminiferal record in the Southwest Pacific, supplementary data to: Hayward, Bruce W; Grenfell, Hugh R; Sabaa, Ashwaq T; Sikes, Elisabeth L (2005): Deep-sea benthic foraminiferal record of the Middle Pleistocene Climate Transition in the South-west Pacific. In: M. J. Head and P. L. Gibbard (eds.). Early Middle Pleistocene transitions: the land-ocean evidence. Geological Society (London), Special Publication, 247, 85-115

    Hayward, Bruce W / Grenfell, Hugh R / Sabaa, Ashwaq T / Sikes, Elisabeth L

    2005  

    Abstract: Benthic foraminiferal faunas from three bathyal sequences provide a proxy record of oceanographic changes through the mid-Pleistocene transition (MPT) on either side of the Subtropical Front (STF), east of New Zealand. Canonical correspondence analyses ... ...

    Abstract Benthic foraminiferal faunas from three bathyal sequences provide a proxy record of oceanographic changes through the mid-Pleistocene transition (MPT) on either side of the Subtropical Front (STF), east of New Zealand. Canonical correspondence analyses show that factors related to water depth, latitude and climate cycles were more significant than oceanographic factors in determining changes in faunal assemblage composition over the last 1 Ma. Even so, mid-Pleistocene faunal changes are recognizable and can be linked to inferred palaeoceanographic causes. North of the largely stationary STF the faunas were less variable than to the south, perhaps reflecting the less extreme glacial-interglacial fluctuations in the overlying Subtropical Surface Water. Prior to Marine Isotope Stage (MIS) 21 and after MIS 15, the northern faunas had fairly constant composition, but during most of the MPT faunal composition fluctuated in response to climate-related food-supply variations. Faunal changes through the MPT suggest increasing food supply and decreasing dissolved bottom oxygen.
    South of the STF, beneath Subantarctic Surface Water, mid-Pleistocene faunas exhibited strong glacial-interglacial fluctuations, inferred to be due to higher interglacial nutrient supply and lower oxygen levels. The most dramatic faunal change in the south occurred at the end of the MPT (MIS 17- 12). with an acme of Abditodentrix pseudothalmanni, possibly reflecting higher carbon flux and lower bottom oxygen.
    This study suggests that the mid-Pleistocene decline and extinction of a group of elongate, cylindrical deep-sea foraminifera may have been related to decreased bottom oxygen concentrations as aresult of slower deep-water currents.
    Language English
    Dates of publication 2005-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    DOI 10.1594/PANGAEA.705195
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Book ; Online: Pliocene foraminifera and SST changes in ODP Site 184-1125, supplementary data to: Sabaa, Ashwaq T; Sikes, Elisabeth L; Hayward, Bruce W; Howard, William R (2004): Pliocene sea surface temperature changes in ODP Site 1125, Chatham Rise, east of New Zealand. Marine Geology, 205(1-4), 113-125

    Sabaa, Ashwaq T / Hayward, Bruce W / Howard, William R / Sikes, Elisabeth L

    2004  

    Abstract: Planktonic foraminiferal census counts were converted to sea surface temperature (SST) estimates using the modern analogue technique (MAT) for the middle-late Pliocene (4.0-2.37 Ma) in ODP Site 1125, north side of Chatham Rise, SW Pacific Ocean. MAT SST( ... ...

    Abstract Planktonic foraminiferal census counts were converted to sea surface temperature (SST) estimates using the modern analogue technique (MAT) for the middle-late Pliocene (4.0-2.37 Ma) in ODP Site 1125, north side of Chatham Rise, SW Pacific Ocean. MAT SST(warm) records range between 8?C and 20.5?C, and MAT SST(cold) records parallel that pattern but with a temperature range of 5-15?C. The modern position of Site 1125 is just north of the Subtropical Front and has an annual temperature range of ~14-18?C. Pliocene warmest temperatures are 1-2? warmer than modern summers, whereas cold season SST records are up to 6-10?C cooler than modern winters. Overall average temperatures at the site are 2-3?C cooler than modern temperatures during a time of sustained global warmth. Three major cold excursions centred on 3.35, 3.0, and 2.8 Ma showed warm season temperatures over 5?C colder than the last glacial maximum, experiencing temperatures typical of modern subantarctic waters. Two minor cold excursions at 2.7 Ma and 2.4 Ma experienced temperatures cooler than modern winters but not as cold as last glacial conditions. Cold season SSTs show a shift to warmer climate upward through the study interval, whereas warm season estimates remain essentially unchanged. We interpret the strong regional cooling of subtropical Southwest Pacific water through the middle-late Pliocene as having been caused by increased upwelling. It is also possible that the subtropical frontal zone moved north over the site in the Pliocene, however, this is considered the least likely interpretation. Our record of cool conditions in the Southwest Pacific corroborate evidence of cooler than modern conditions in other regions of the western Pacific through the mid-Pliocene despite overall global warming.
    Language English
    Dates of publication 2004-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1016/S0025-3227(04)00020-9
    DOI 10.1594/PANGAEA.734790
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  10. Book ; Online: Late Quaternary benthic foraminiferal record of the Bounty Trough, east of New Zealand, supplementary data to: Hayward, Bruce W; Sabaa, Ashwaq T; Grenfell, Hugh R (2004): Benthic foraminifera and the Late Quaternary (last 150 ka) paleoceanographic and sedimentary history of the Bounty Trough, east of New Zealand. Palaeogeography, Palaeoclimatology, Palaeoecology, 211(1-2), 59-93

    Hayward, Bruce W / Grenfell, Hugh R / Sabaa, Ashwaq T

    2004  

    Abstract: The Bounty Trough, east of New Zealand, lies along the southeastern edge of the present-day Subtropical Front (STF), and is a major conduit via the Bounty Channel, for terrigenous sediment supply from the uplifted Southern Alps to the abyssal Bounty Fan. ...

    Abstract The Bounty Trough, east of New Zealand, lies along the southeastern edge of the present-day Subtropical Front (STF), and is a major conduit via the Bounty Channel, for terrigenous sediment supply from the uplifted Southern Alps to the abyssal Bounty Fan. Census data on 65 benthic foraminiferal faunas (>63 ?m) from upper bathyal (ODP 1119), lower bathyal (DSDP 594) and abyssal (ODP 1122) sequences, test and refine existing models for the paleoceanographic and sedimentary history of the trough through the last 150 ka (marine isotope stages, MIS 6-1).
    Cluster analysis allows recognition of six species groups, whose distribution patterns coincide with bathymetry, the climate cycles and displaced turbidite beds. Detrended canonical correspondence analysis and comparisons with modern faunal patterns suggest that the groups are most strongly influenced by food supply (organic carbon flux), and to a lesser extent by bottom water oxygen and factors relating to sediment type.
    Major faunal changes at upper bathyal depths (1119) probably resulted from cycles of counter-intuitive seaward-landward migrations of the Southland Front (SF) (north-south sector of the STF). Benthic foraminiferal changes suggest that lower nutrient, cool Subantarctic Surface Water (SAW) was overhead in warm intervals, and higher nutrient-bearing, warm neritic Subtropical Surface Water (STW) was overhead in cold intervals.
    At lower bathyal depths (594), foraminiferal changes indicate increased glacial productivity and lowered bottom oxygen, attributed to increased upwelling and inflow of cold, nutrient-rich, Antarctic Intermediate Water (AAIW) and shallowing of the oxygen-minimum zone (upper Circum Polar Deep Water, CPDW). The observed cyclical benthic foraminiferal changes are not a result of associations migrating up and down the slope, as glacial faunas (dominated by Globocassidulina canalisuturata and Eilohedra levicula at upper and lower bathyal depths, respectively) are markedly different from those currently living in the Bounty Trough.
    On the abyssal Bounty Fan (1122), faunal changes correlate most strongly with grain size, and are attributed to varying amounts of mixing of displaced and in-situ faunas. Most of the displaced foraminifera in turbiditic sand beds are sourced from mid-outer shelf depths at the head of the Bounty Channel. Turbidity currents were more prevalent during, but not restricted to, glacial intervals.
    Language English
    Dates of publication 2004-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1016/j.palaeo.2004.04.007
    DOI 10.1594/PANGAEA.705193
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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