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Herb, René (1968): Relative abundances of planktonic foraminifera from surface sediments of the Drake Passage, Southern Ocean (Table 1). PANGAEA,, Supplement to: Herb, R (1968): Recent planktonic foraminifera from sediments of the Drake Passage, Southern Ocean. Ecologae Geologicae Helvetiae, 61(2), 467-480

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Based on a qualitative and quantitative evaluation of Recent sediments samples (top 3 cm of cores as well as Petersen grab samples) from the Drake Passage, between South America and Antarctica, the distribution of planktonic foraminifera and their relation to oceanographic conditions was investigated. The Antarctic Convergence - the northern limit of the cold Antarctic Surface Water - is shown to be of major importance in controlling the distributional pattern of planktonic species as well as their total numbers. South of the convergence, Globigerina pachyderma is usually the only species found in the sediment. It occurs with abundances not greater than 6000 per gram dry sediment, and at most stations less than 100 specimens per gram of dry sediment were recovered. At a number of deep-sea stations below 3700 m depth approx. no planktonic foraminifera were found at all. It is most probable, that at least some of these stations are located below the limit of CaCO3 dissolution. North of the Antarctic Convergence planktonic foraminiferal numbers are much higher and range from 1800 to 120000 per gram of dry sediment. Eight species are the major constituents of the population: Globigerina pachyderma, Globigerina bulloides, Globogerina quinqueloba, Globigerina inflata, Globorotalia truncatolinoides, Globorotalia scitula, Globigerinita glutinata and Globigerinita uvula. The widespread occurrence of Globorotalia truncatulinoides, which in the northern hemisphere is usually a subtropical form, is especially noteworthy. Another Globigerina, morphologically similar to G. pachyderma, has been recognized frequently north of the Antarctic Convergence. Globigerina megastoma which has its type area in the Drake Passage, has been found only rarely. Orbulina universa occurs in samples from the areas of higher water temperature around the South American Continent. Globigerina pachyderma is predominantly sinistrally coiled throughout the area investigated, but a slight increase in the percentage of dextrally coiled specimens may be noticed with increasing water temperature, i.e. from south to north.
Median Latitude: -59.126853 * Median Longitude: -63.167128 * South-bound Latitude: -64.900000 * West-bound Longitude: -71.250000 * North-bound Latitude: -52.016700 * East-bound Longitude: -55.566700
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Sample code/labelSample labelHerb, René
4Depth, bathymetricBathy depthmHerb, RenéEchosounder (ECHO)
5DEPTH, sediment/rockDepthmGeocode
6Foraminifera, plankticForam plankt#Herb, René
7Globigerina pachydermaG. pachyderma%Herb, RenéCounting 32-500 µm fraction
8Globigerina sp.Globigerina sp.%Herb, RenéCounting 32-500 µm fraction
9Globigerina quinquelobaG. quinqueloba%Herb, RenéCounting 32-500 µm fraction
10Globigerina bulloidesG. bulloides%Herb, RenéCounting 32-500 µm fraction
11Globigerina megastomaG. megastoma%Herb, RenéCounting 32-500 µm fraction
12Globorotalia inflataG. inflata%Herb, RenéCounting 32-500 µm fraction
13Globorotalia truncatulinoidesG. truncatulinoides%Herb, RenéCounting 32-500 µm fraction
14Globorotalia scitulaG. scitula%Herb, RenéCounting 32-500 µm fraction
15Globigerinita glutinataG. glutinata%Herb, RenéCounting 32-500 µm fraction
16Globigerinita uvulaG. uvula%Herb, RenéCounting 32-500 µm fraction
17Orbulina universaO. universa%Herb, RenéCounting 32-500 µm fraction
504 data points

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