Citation:

S0031-0182(98)00141-2

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Abstract:

The environmental preferences of calcareous dinoflagellates have been investigated over the last 140 ka by comparing material from two sediment cores: one from the highly productive equatorial divergence of the eastern Atlantic Ocean and the other from the low productivity western tropical Atlantic Ocean. Pronounced differences in palaeoproductivity between the two sediment cores are indicated by high and variable organic carbon accumulation rates in the east, in contrast to relatively constant and low values in the west. Calcareous dinoflagellates show just the opposite pattern: high accumulation rates in the west and lower in the east. At the equatorial divergence, temporal variations of calcareous dinoflagellate and organic carbon accumulation rates show, for the most part, an inverse relationship. High calcareous dinoflagellate content coincides with low organic carbon accumulation rates and vice versa. In the investigated region and time interval, enhanced production of calcareous dinoflagellates can be correlated to periods of reduced palaeoproductivity probably related to relatively stratified conditions of the upper water column.

Related to:

Höll, Christine (1998): Kalkige und organisch-wandige Dinoflagellaten-Zysten in Spätquartären Sedimenten des tropischen Atlantiks und ihre palökologische Auswertbarkeit. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 127, 121 pp, urn:nbn:de:gbv:46-ep000102467

Project(s):

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents (SFB261)

Coverage:

Latitude: -8.528333 * Longitude: -34.021667

Date/Time Start: 1993-03-22T00:00:00 * Date/Time End: 1993-03-22T00:00:00

Minimum DEPTH, sediment/rock: 0.05 m * Maximum DEPTH, sediment/rock: 3.45 m

Event(s):

GeoB2204-2 * Latitude: -8.528333 * Longitude: -34.021667 * Date/Time: 1993-03-22T00:00:00 * Elevation: -2072.0 m * Recovery: 8.97 m * Location: Brazil Basin * Campaign: * Basis: * Method/Device: Gravity corer (Kiel type) (SL) * Comment: weight on top of sediment

Comment:

For calcareous dinoflagellates of GeoB1105-4 see Höll et al. (1998) dataset: doi:10.1594/PANGAEA.55381

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Thoracosphaera heimii	T. heimii	#	Höll, Christine	Counting, dinoflagellate cysts
3	Calciodinellum albatrosianum	C. albatrosianum	#	Höll, Christine	Counting, dinoflagellate cysts
4	Calciodinellum levantinum	C. levantinum	#	Höll, Christine	Counting, dinoflagellate cysts
5	Calciodinellum levantinum	C. levantinum	#	Höll, Christine	Counting, dinoflagellate cysts	species 3
6	Leonella granifera	L. granifera	#	Höll, Christine	Counting, dinoflagellate cysts
7	Rhabdothorax spp.	Rhabdothorax spp.	#	Höll, Christine	Counting, dinoflagellate cysts
8	Sample mass	Samp m	g	Höll, Christine	see reference(s)
9	Sample volume	Samp vol	l	Höll, Christine	see reference(s)
10	Slide volume	slide vol	ml	Höll, Christine	see reference(s)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

315 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Depth sed [m]	2 T. heimii [#] (Counting, dinoflagellate cysts)	3 C. albatrosianum [#] (Counting, dinoflagellate cysts)	4 C. levantinum [#] (Counting, dinoflagellate cysts)	5 C. levantinum [#] (species 3, Counting, dinoflag...)	6 L. granifera [#] (Counting, dinoflagellate cysts)	7 Rhabdothorax spp. [#] (Counting, dinoflagellate cysts)	8 Samp m [g] (see reference(s))	9 Samp vol [l] (see reference(s))	10 slide vol [ml] (see reference(s))
0.05	382	29	146	0	4	0	0.010	0.005	0.1
0.15	402	38	90	0	3	1	0.010	0.005	0.1
0.25	612	25	85	0	4	0	0.010	0.005	0.1
0.35	361	22	73	0	0	1	0.010	0.005	0.1
0.45	519	10	95	2	3	1	0.010	0.005	0.1
0.55	402	10	122	1	5	0	0.010	0.005	0.1
0.65	512	9	72	4	2	0	0.010	0.005	0.1
0.75	190	11	71	0	0	0	0.010	0.005	0.1
0.85	327	12	100	0	1	0	0.010	0.005	0.1
0.95	275	6	105	1	3	0	0.010	0.005	0.1
1.05	343	7	90	1	2	0	0.010	0.005	0.1
1.15	253	6	118	0	1	0	0.010	0.005	0.1
1.25	333	10	112	0	3	0	0.010	0.005	0.1
1.35	423	29	85	0	1	0	0.010	0.005	0.1
1.45	647	7	128	0	1	0	0.010	0.005	0.1
1.55	364	6	89	1	1	0	0.010	0.005	0.1
1.65	521	4	107	2	0	0	0.010	0.005	0.1
1.75	231	8	66	2	0	0	0.010	0.005	0.1
1.85	542	9	46	0	2	0	0.010	0.005	0.1
1.95	397	11	78	0	0	0	0.010	0.005	0.1
2.05	336	8	42	0	1	0	0.010	0.005	0.1
2.15	327	7	76	1	3	0	0.010	0.005	0.1
2.25	261	8	52	0	7	0	0.010	0.005	0.1
2.35	247	9	40	0	7	0	0.010	0.005	0.1
2.45	602	23	101	0	3	0	0.010	0.005	0.1
2.55	458	40	106	0	5	0	0.010	0.005	0.1
2.65	385	10	34	1	1	0	0.010	0.005	0.1
2.75	274	20	51	0	7	0	0.010	0.005	0.1
2.85	167	15	13	0	6	0	0.010	0.005	0.1
2.95	699	134	101	1	11	1	0.010	0.005	0.1
3.05	641	93	47	0	8	0	0.010	0.005	0.1
3.15	453	61	16	0	10	2	0.010	0.005	0.1
3.25	555	22	43	0	1	0	0.010	0.005	0.1
3.35	592	25	43	0	1	0	0.010	0.005	0.1
3.45	652	10	37	0	2	0	0.010	0.005	0.1