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Crosta, Xavier; Romero, Oscar E; Armand, Leanne K; Pichon, Jean-Jacques (2005): Relative abundance of diatom species in surface samples from the Southern Ocean, major open ocean species. PANGAEA,, Supplement to: Crosta, X et al. (2005): The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species. Palaeogeography, Palaeoclimatology, Palaeoecology, 223(1-2), 66-92,

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Diatom assemblages from 228 core-top samples were investigated to determine the modern geographic distributions of 10 major open ocean species or species groups in the Atlantic and Indian sectors of the Southern Ocean. Our study gives a more comprehensive view of the relationships between diatom distribution and environmental pressures than previous studies, as our modern database covers a much wider area, and additionally highlights the relationships with sea ice cover and concentration. The 10 species or species categories can mainly be lumped into three groupings. First, a cool open ocean grouping composed of Rhizosolenia pointed group, Thalassiosira gracilis group and Trichotoxon reinboldii with maximum relative abundances occurring within the maximum winter sea-ice edge. Second, a pelagic open ocean grouping composed of Fragilariopsis kerguelensis, Thalassiosira lentiginosa, Thalassiosira oliverana and Thalassiothrix spp. group with maximum occurrences at the Antarctic Polar Front. Third, a warm open ocean grouping with maximum abundances observed within the Polar Front Zone and composed of the Rhizosolenia rounded group, the Thalassionema nitzschioides var. nitzschioides group and the Thalassionema nitzschioides var. lanceolata. Comparisons of the abovementioned 10 species or species groups with modern February sea-surface temperatures and sea-ice duration and concentration reveal species-specific sedimentary distributions regulated both by sea-surface temperatures and sea ice conditions that support the use of diatom remains to reconstruct past variations of these environmental parameters via qualitative and transfer function approaches.
Median Latitude: -38.664575 * Median Longitude: -22.036029 * South-bound Latitude: -44.516800 * West-bound Longitude: -24.248500 * North-bound Latitude: -31.950000 * East-bound Longitude: -17.340000
Date/Time Start: 2000-02-17T05:54:00 * Date/Time End: 2000-03-04T02:21:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
GeoB6402-9 * Latitude: -39.742700 * Longitude: -22.756500 * Date/Time: 2000-02-17T05:54:00 * Elevation: -3878.0 m * Recovery: 0.43 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: Giant box corer (GKG) * Comment: 3 x bottom contact
GeoB6403-4 * Latitude: -40.013300 * Longitude: -23.365200 * Date/Time: 2000-02-17T20:49:00 * Elevation: -4226.0 m * Recovery: 0.14 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 4 large, 4 small tubes filled
GeoB6404-3 * Latitude: -41.505800 * Longitude: -23.464800 * Date/Time: 2000-02-18T10:17:00 * Elevation: -4223.0 m * Recovery: 0.11 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 4 large, 4 small tubes filled, CTD at 50 m
Depth=Surface sediment 0-1 cm
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepth sedmGeocode
6Fragilariopsis kerguelensisF. kerguelensis%Romero, Oscar ECounting, diatoms
7Rhizosolenia antennata forma semispinaR. antennata f semispina%Romero, Oscar ECounting, diatoms
8Thalassionema nitzschioides var. nitzschioidesT. nitzschioides var. nitzschioides%Romero, Oscar ECounting, diatoms
9Thalassionema nitzschioides var. capitulataT. nitzschioides var. capitulata%Romero, Oscar ECounting, diatoms
10Thalassionema nitzschioides var. lanceolataT. nitzschioides var. lanceolata%Romero, Oscar ECounting, diatoms
11Thalassiosira gracilisT. gracilis%Romero, Oscar ECounting, diatoms
12Thalassiosira gracilis var. expectaT. gracilis var. expecta%Romero, Oscar ECounting, diatoms
13Thalassiosira lentiginosaT. lentiginosa%Romero, Oscar ECounting, diatoms
14Thalassiothrix antarcticaT. antarctica%Romero, Oscar ECounting, diatoms
216 data points

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