8ef0c08f-722f-4166-aefa-42a2a031b662 urn:uuid en UTF-8 nonGeographicDataset nonGeographicDataset 2017-06-24T17:05:52 creation ISO 19115 2016 Diatom recovery from core MD88-779: Raw counts 8ef0c08f-722f-4166-aefa-42a2a031b662 Core MD88-779 was taken during the 1988 French ASPARA IV cruise in the South East Indian Ocean aboard the Marion Dufresne. The core is situated on the South Tasman Rise (47º50.690S, 146º32.750E) at a depth of 2260m. Although the core recovered was 6.7m long, only the top 2.6m were studied as preliminary investigations had indicated that this section covered the last two glacial cycles. A total of 37 diatom species and taxa were observed in the core samples, comprising predominantly warm-water fauna. The majority of samples were poorly preserved and showed high levels of dissolution making identification to species level often difficult. Species with greatest abundances were those more heavily silicified (e.g. Fragilariopsis kerguelansis), and to a lesser extent the warm-water forms (e.g. Fragilariopsis doliolu). The complete loss of a diatom record at 170cm and 210/220cm in the core is extremely unusual. The diatom signal is interpreted as having been removed by increased water mass velocity, extreme post-depositional silica dissolution or decreased productivity. There is no sedimentological evidence from the core which provides further interpretation. The diatom recovery from this core is considerably low when compared to samples from the Southern Ocean. {"type": "Polygon", "coordinates": [[[130.0, -48.0], [155.0, -48.0], [155.0, -35.0], [130.0, -35.0], [130.0, -48.0]]]} 130.0 155.0 -48.0 -35.0 53001900 53120000 53150900 Azpeitia tabularis Biosphere Diatoms Fragilariopsis doliolus Hemidiscus cuneiformis Microbiota Roperia tesselata Thalassionema nitzschioides Thalassiosira lineata App 1-1.pdf documentDigital PDF App 6-5 779.pdf documentDigital PDF aodn:bluenet_datasets_southern_indian_ocean documentDigital Core Data – Southern and Indian Ocean WMS http://gcmd.nasa.gov/Resources/valids/keyword_list.html documentDigital HTML http://www.marine.csiro.au/csquares/index.html documentDigital HTML