Citation:

PANGAEA.965722

Name: Coccolith species abundances in sediment core GeoB11035-1 from the NW Iberian continental margin for the past 55 ka
Published: 2024-04-15
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Assemblages; coccolith abundances; Coccolithophores; North Atlantic

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Abstract:

Coccolithophore assemblage data from sediment core GeoB11035-1 from the NW Iberian continental margin for the past 55 ka. The assemblage data were used to assess changes in biodiversity and assemblage composition during the past 24 ka, i.e., from the Last Glacial Maximum to the current warm period covering the last deglaciation.

Samples were analysed at 0.5-10 cm intervals and were prepared using a combined dilution/filtering technique as described by Andruleit (1996, doi:10.2307/1485964). Between 50 and 120 mg of dry bulk sediment was brought into suspension using demineralized water buffered with ammonia (pH ~ 8.5-9). The suspension was ultrasonicated for 15 to 30 s, split (split factor = 100) using a rotary splitter and filtered onto polycarbonate membrane filters (0.4 µm pore size) using a vacuum pump. Samples were dried at 40°C for 24 h before ~1x1 cm filter aliquots were mounted on an aluminium stub that was prepared with electroconductive, self-adhesive, carbon-based discs (PLANO Leit tabs). The mounted samples were sputtered with gold/palladium in a Polaron SC7640 Sputter Coater.

Coccolith counts (N) were made manually using a Zeiss DSM 940A scanning electron microscope at 3,000x magnification. Where possible, a minimum of 300 coccoliths were counted. In some samples fewer coccoliths were counted due to low abundances. Sample mass (m), magnification, split factor (k) and the area of the scanned transect (A) and the filter (F) are given for all samples to allow calculation of the concentration of coccoliths per gram of dry bulk sediment, which was calculated using: (F*N)/(k*A*m).

Coccolithophore taxonomy follows Young et al. (2003, doi:10.58998/jnr2297). Species not reported in the data are assumed to be absent (that is, zero abundance). Two subspecies of Coccolithus pelagicus were distinguished: Coccolithus pelagicus susp. pelagicus and Coccolithus pelagicus susp. braarudii as well as two subspecies of Calcidiscus leptoporus: Calcidiscus leptoporus subsp. quadriperforatus and Calcidiscus leptoporus subsp. leptoporus. Calcidiscus leptoporus subsp. leptoporus was further subdivided into small (< 5 µm) and larger (>= 5 µm) specimens. Counts of unidentified and reworked specimens are given.

The chronology of the time series presented here was revised using a similar approach as in the PALMOD 130k marine palaeoclimate data synthesis V1.1 (Jonkers et al., 2020, doi:10.5194/essd-12-1053-2020). It is based on radiocarbon ages measured on the planktonic foraminifera G. bulloides (>250 µm) and tie points between the Ca/Ti record with the GISP II δ18O record (Bender et al., 2012, doi:10.1007/s00367-012-0282-2).

Keyword(s):

Assemblages; coccolith abundances; Coccolithophores; North Atlantic

Coverage:

Latitude: 42.171611 * Longitude: -9.657778

Date/Time Start: 2006-08-31T14:31:00 * Date/Time End: 2006-08-31T14:31:00

Minimum DEPTH, sediment/rock: 0.030 m * Maximum DEPTH, sediment/rock: 5.005 m

Event(s):

GeoB11035-1 * Latitude: 42.171611 * Longitude: -9.657778 * Date/Time: 2006-08-31T14:31:00 * Elevation: -2045.0 m * Recovery: 5.05 m * Campaign: * Basis: * Method/Device: Gravity corer (GC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Baumann, Karl-Heinz		Geocode
2	Depth, top/min	Depth top	m	Baumann, Karl-Heinz
3	Depth, bottom/max	Depth bot	m	Baumann, Karl-Heinz
4	AGE	Age	ka BP	Baumann, Karl-Heinz		Geocode
5	Acanthoica quattrospina	A. quattrospina	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
6	Algirosphaera robusta	A. robusta	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
7	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	< 5 µm
8	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	>= 5 µm
9	Calcidiscus leptoporus ssp. quadriperforatus	C. leptoporus ssp. quadriperforatus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
10	Calciosolenia brasiliensis	C. brasiliensis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
11	Coccolithus pelagicus ssp. braarudii	C. pelagicus ssp. braarudii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
12	Coccolithus pelagicus ssp. braarudii	C. pelagicus ssp. braarudii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
13	Coronosphaera mediterranea	C. mediterranea	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
14	Emiliania huxleyi	E. huxleyi	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
15	Florisphaera profunda	F. profunda	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
16	Gephyrocapsa ericsonii	G. ericsonii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
17	Gephyrocapsa muellerae	G. muellerae	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
18	Gephyrocapsa oceanica	G. oceanica	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
19	Gladiolithus flabellatus	G. flabellatus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
20	Hayaster perplexus	H. perplexus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
21	Helicosphaera carteri	H. carteri	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
22	Helicosphaera wallichii	H. wallichii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
23	Oolithotus antillarum	O. antillarum	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
24	Oolithotus fragilis	O. fragilis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
25	Ophiaster hydroideus	O. hydroideus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
26	Papposphaera spp.	Papposphaera spp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
27	Pontosphaera discopora	P. discopora	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
28	Pontosphaera spp.	Pontosphaera spp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
29	Reticulofenestra sessilis	R. sessilis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
30	Rhabdosphaera clavigera	R. clavigera	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
31	Syracosphaera pulchra	S. pulchra	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
32	Syracosphaera sp.	Syracosphaera sp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
33	Umbilicosphaera foliosa	U. foliosa	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
34	Umbilicosphaera sibogae	U. sibogae	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
35	Umbilicosphaera hulburtiana	U. hulburtiana	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
36	Umbellosphaera tenuis	U. tenuis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
37	Umbellosphaera irregularis	U. irregularis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
38	Umbellosphaera sp.	Umbellosphaera sp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
39	Coccoliths indeterminata	Coccoliths indet	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
40	Coccoliths, reworked	Cocco rew	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
41	Sample mass	Samp m	g	Baumann, Karl-Heinz
42	Split factor	Split F		Baumann, Karl-Heinz
43	Magnification	Mag		Baumann, Karl-Heinz
44	Frame width	Frame w	mm	Baumann, Karl-Heinz
45	Transect length	Transect length	mm	Baumann, Karl-Heinz
46	Scanned area	Scanned area	mm²	Baumann, Karl-Heinz
47	Filter, area	Filter area	mm²	Baumann, Karl-Heinz
48	Acanthoica quattrospina	A. quattrospina	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
49	Algirosphaera robusta	A. robusta	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
50	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	< 5 µm
51	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	>= 5 µm
52	Calcidiscus leptoporus ssp. quadriperforatus	C. leptoporus ssp. quadriperforatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
53	Calciosolenia brasiliensis	C. brasiliensis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
54	Coccolithus pelagicus ssp. pelagicus	C. pelagicus ssp. pelagicus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
55	Coccolithus pelagicus ssp. braarudii	C. pelagicus ssp. braarudii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
56	Coronosphaera mediterranea	C. mediterranea	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
57	Emiliania huxleyi	E. huxleyi	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
58	Florisphaera profunda	F. profunda	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
59	Gephyrocapsa ericsonii	G. ericsonii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
60	Gephyrocapsa muellerae	G. muellerae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
61	Gephyrocapsa oceanica	G. oceanica	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
62	Gladiolithus flabellatus	G. flabellatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
63	Hayaster perplexus	H. perplexus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
64	Helicosphaera carteri	H. carteri	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
65	Helicosphaera wallichii	H. wallichii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
66	Oolithotus antillarum	O. antillarum	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
67	Oolithotus fragilis	O. fragilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
68	Ophiaster hydroideus	O. hydroideus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
69	Papposphaera spp.	Papposphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
70	Pontosphaera discopora	P. discopora	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
71	Pontosphaera spp.	Pontosphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
72	Reticulofenestra sessilis	R. sessilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
73	Rhabdosphaera clavigera	R. clavigera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
74	Syracosphaera pulchra	S. pulchra	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
75	Syracosphaera sp.	Syracosphaera sp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
76	Umbilicosphaera foliosa	U. foliosa	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
77	Umbilicosphaera sibogae	U. sibogae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
78	Umbilicosphaera hulburtiana	U. hulburtiana	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
79	Umbellosphaera tenuis	U. tenuis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
80	Umbellosphaera irregularis	U. irregularis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
81	Umbellosphaera sp.	Umbellosphaera sp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
82	Coccoliths indeterminata per unit sediment mass	Cocco indet/sed	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
83	Coccoliths, reworked per unit sediment mass	Cocco rew/sed	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

7695 data points

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