10.1594/PANGAEA.425285
Crosta, Xavier
Xavier
Crosta
0000-0002-8005-9939
Romero, Oscar E
Oscar E
Romero
0000-0003-0209-3258
Armand, Leanne K
Leanne K
Armand
0000-0003-3995-308X
Pichon, Jean-Jacques
Jean-Jacques
Pichon
Relative abundance of diatom species in surface samples from the Southern Ocean, major open ocean species
PANGAEA
2005
Event label
Latitude of event
Longitude of event
Elevation of event
DEPTH, sediment/rock
Fragilariopsis kerguelensis
Rhizosolenia antennata forma semispina
Thalassionema nitzschioides var. nitzschioides
Thalassionema nitzschioides var. capitulata
Thalassionema nitzschioides var. lanceolata
Thalassiosira gracilis
Thalassiosira gracilis var. expecta
Thalassiosira lentiginosa
Thalassiothrix antarctica
Giant box corer
MultiCorer
Gravity corer (Kiel type)
Counting, diatoms
M46/4
Meteor (1986)
Center for Marine Environmental Sciences (MARUM)
2000-02-17T05:54:00/2000-03-04T02:21:00
en
Supplementary Dataset
10.1016/j.palaeo.2005.03.028
216 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
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.
Depth=Surface sediment 0-1 cm
Supplement to: Crosta, Xavier; Romero, Oscar E; Armand, Leanne K; Pichon, Jean-Jacques (2005): The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species. Palaeogeography, Palaeoclimatology, Palaeoecology, 223(1-2), 66-92
-24.2485
-17.34
-44.5168
-31.95
Central South Atlantic