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Vink, Annemiek; Brune, Anja; Höll, Christine; Zonneveld, Karin A F; Willems, Helmut (2000): Dinoflagellates of sediment core GeoB1523-1. PANGAEA, https://doi.org/10.1594/PANGAEA.56156, Supplement to: Vink, A et al. (2002): On the response of calcareous dinoflagellates to oligotrophy and stratification of the water column in the equatorial Atlantic Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology, 178(1-2), 53-66, https://doi.org/10.1016/S0031-0182(01)00368-6

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Abstract:
Large numbers of calcareous dinoflagellate cysts and the vegetative calcareous coccoid species Thoracosphaera heimii are generally found in sediments underlying oligotrophic and/or stratified (sub)surface water environments. It is difficult to distinguish between the relative importance of these two environmental parameters on calcareous cyst and T. heimii distribution as they usually covary, but this information is essential if we want to apply cysts properly in the reconstruction of palaeoenvironments and past surface water hydrography. In the multi-proxy core GeoB 1523-1 from the Ceará Rise region in the western equatorial Atlantic Ocean (covering the past 155 ka), periods of greatest oligotrophy are not synchronous with periods of greatest stratification (Rühlemann et al., 1996, doi:10.1016/S0025-3227(96)00048-5; Mulitza et al., 1997, doi:10.1130/0091-7613(1997)025<0335:PFAROP>2.3.CO;2; 335-338; Mulitza et al., 1998, doi:10.1016/S0012-821X(98)00012-0), giving us the unique opportunity to differentiate between the effects of both parameters on cyst accumulation. The calcareous cyst record of the core reflects prominent increases in accumulation rate of nearly all observed species only during the nutrient-enriched but more stratified isotopic (sub)stages 5.5, 5.3, 5.1 and 1. In this respect, the distribution trends in the core are more similar to those of the eastern equatorial upwelling region (GeoB 1105-4) than they are to those of the oligotrophic north-eastern Brazilian continental slope (GeoB 2204-2), even though temporal changes in bioproductivity are principally in antiphase between the eastern and western equatorial regions. We conclude that stratification of the upper water column and the presence of a well-developed thermocline are probably the more important factors controlling cyst distribution in the equatorial Atlantic, whereas the state of oligotrophy secondarily influences cyst production within a well-stratified environment.
Related to:
Vink, Annemiek (2000): Reconstruction of recent and late Quaternary surface water masses of the western subtropical Atlantic Ocean based on calcareous and organic-walled dinoflagellate cysts. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 159, 160 pp, urn:nbn:de:gbv:46-ep000102797
Coverage:
Latitude: 3.831667 * Longitude: -41.621667
Date/Time Start: 1991-05-17T00:00:00 * Date/Time End: 1991-05-17T00:00:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 3.98 m
Event(s):
GeoB1523-1 * Latitude: 3.831667 * Longitude: -41.621667 * Date/Time: 1991-05-17T00:00:00 * Elevation: -3292.0 m * Recovery: 6.65 m * Location: Amazon Fan * Campaign: M16/2 * Basis: Meteor (1986) * Device: Gravity corer (Kiel type) (SL)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Thoracosphaera heimiiT. heimii#Willems, HelmutCounting, dinoflagellate cystssize > 20 µm
3Thoracosphaera heimiiT. heimii#Willems, HelmutCounting, dinoflagellate cystssize < 20 µm
4Pernambugia tuberosaP. tuberosa#Willems, HelmutCounting, dinoflagellate cystssize > 20 µm
5Pernambugia tuberosaP. tuberosa#Willems, HelmutCounting, dinoflagellate cystssize < 20 µm
6Calciodinellum levantinumC. levantinum#Willems, HelmutCounting, dinoflagellate cystssize > 20 µm
7Calciodinellum levantinumC. levantinum#Willems, HelmutCounting, dinoflagellate cystssize > 20 µm, species 3
8Calciodinellum levantinumC. levantinum#Willems, HelmutCounting, dinoflagellate cystssize < 20 µm
9Calciodinellum levantinumC. levantinum#Willems, HelmutCounting, dinoflagellate cystssize < 20 µm, species 3
10Calciodinellum albatrosianumC. albatrosianum#Willems, HelmutCounting, dinoflagellate cystssize > 20 µm
11Calciodinellum albatrosianumC. albatrosianum#Willems, HelmutCounting, dinoflagellate cystssize < 20 µm
12Leonella graniferaL. granifera#Willems, HelmutCounting, dinoflagellate cystssize > 20 µm
13Leonella graniferaL. granifera#Willems, HelmutCounting, dinoflagellate cystssize < 20 µm
14Scrippsiella regalisS. regalis#Willems, HelmutCounting, dinoflagellate cystssize > 20 µm
15Scrippsiella regalisS. regalis#Willems, HelmutCounting, dinoflagellate cystssize < 20 µm
16Sample massSamp mgWillems, Helmutsize > 20 µm
17Sample massSamp mgWillems, Helmutsize < 20 µm
18Sample volumeSamp vollWillems, Helmutsize > 20 µm
19Sample volumeSamp vollWillems, Helmutsize < 20 µm
20Slide volumeslide volmlWillems, Helmutsee reference(s)size > 20 µm
21Slide volumeslide volmlWillems, Helmutsee reference(s)size < 20 µm
Size:
1120 data points

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