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Bouimetarhan, Ilham; Chiessi, Cristiano Mazur; González-Arango, Catalina; Dupont, Lydie M; Voigt, Ines; Prange, Matthias; Zonneveld, Karin A F (2018): Pollen counts of sediment core GeoB16205-4 from Parnaiba, NE Brazil. PANGAEA,, Supplement to: Bouimetarhan, I et al. (2018): Intermittent development of forest corridors in northeastern Brazil during the last deglaciation: Climatic and ecologic evidence. Quaternary Science Reviews, 192, 86-96,

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The semi-arid northeastern (NE) Brazil vegetation is largely dominated by Caatinga, one of the largest and richest dry forests in the world. Caatinga is a strategic biome, since it has borders with Cerrado, Atlantic forests and the Amazon, acting as a potential corridor (or barrier) for biotic interchange between these regions during evolutionary times. Therefore, accurate reconstructions of past vegetation, ecological and hydrological changes in this area are critical to understanding the dynamics of biome boundaries that may play an important role in dispersal and diversi!cation mechanisms and, more specifically, the link between the long-term climate variability and tropical biodiversity. Here, we present high-resolution palynological and elemental data from marine core GeoB16205-4 retrieved off the Parnaíba River mouth (NE Brazil) mainly covering the Younger Dryas (YD). We show that the YD interval was predominantly wet in NE Brazil, yet it was not homogenous and two distinct phases could be distinguished. A marked intensi!cation of wet conditions between ~12.3 and 11.6 cal kyr BP was recorded by the expansion of tropical rainforest and tree ferns. These results are in agreement with the transient TraCE-21k coupled climate model simulation. We infer that the second pluvial phase of the YD is related to a weak AMOC due to meltwater pulses in the North Atlantic, which forces a southward shift of the Intertropical Convergence Zone and its associated rainfall. Our records provide new evidence on the establishment of an “eastern forest corridor” in the nowadays semi-arid Caatinga allowing for past biotic interchanges of plant species.
Latitude: -1.351833 * Longitude: -43.096667
Date/Time Start: 2012-02-23T23:32:00 * Date/Time End: 2012-02-23T23:32:00
Minimum DEPTH, sediment/rock: 0.10 m * Maximum DEPTH, sediment/rock: 4.00 m
GeoB16205-4 (056-4) * Latitude: -1.351833 * Longitude: -43.096667 * Date/Time: 2012-02-23T23:32:00 * Elevation: -1955.0 m * Recovery: 6.2 m * Location: Continental Slope Northeast Brazil * Campaign: MSM20/3 (AMADEUS) * Basis: Maria S. Merian * Method/Device: Gravity corer (Kiel type) (SL) * Comment: Geology, 620 cm
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1AGEAgeka BPBouimetarhan, IlhamGeocode
2DEPTH, sediment/rockDepthmBouimetarhan, IlhamGeocode
3GramineaeGraae#Bouimetarhan, IlhamCounting, palynology
4CyperaceaeCypae#Bouimetarhan, IlhamCounting, palynology
5RhizophoraRhiz#Bouimetarhan, IlhamCounting, palynologyRhizophoraceae
6TyphaTyp#Bouimetarhan, IlhamCounting, palynologyTyphaceae
7GramineaeGraae#Bouimetarhan, IlhamCounting, palynology25 µm
8PodocarpusPod#Bouimetarhan, IlhamCounting, palynology
9ArtemisiaArt#Bouimetarhan, IlhamCounting, palynology
10AsteroideaeAsteroideae#Bouimetarhan, IlhamCounting, palynology
11Ephedra distachya-typeEph.d-T#Bouimetarhan, IlhamCounting, palynology
12Ephedra fragilis-typeEph.f-T#Bouimetarhan, IlhamCounting, palynology
13Amaranthaceae/ChenopodiaceaeChen/Amar#Bouimetarhan, IlhamCounting, palynology
14PlantagoPla#Bouimetarhan, IlhamCounting, palynology
15AcaciaAca#Bouimetarhan, IlhamCounting, palynology
16Boscia-typeBoscia-T#Bouimetarhan, IlhamCounting, palynology
17MitracarpusMitracar#Bouimetarhan, IlhamCounting, palynology
18ZiziphusZiziphus#Bouimetarhan, IlhamCounting, palynology
19Mimosa-typeMimosa-T#Bouimetarhan, IlhamCounting, palynology
20BorreriaBorreria#Bouimetarhan, IlhamCounting, palynology
21Cassia-typeCassia-T#Bouimetarhan, IlhamCounting, palynology
22CeltisCel#Bouimetarhan, IlhamCounting, palynology
23Phyllanthus-typePhyllanthus-T#Bouimetarhan, IlhamCounting, palynology
24PiliostigmaPiliosti#Bouimetarhan, IlhamCounting, palynology
25Vernonia-typeVernonia-T#Bouimetarhan, IlhamCounting, palynology
26AlchorneaAlchornea#Bouimetarhan, IlhamCounting, palynology
27Stereospermum-typeStereospermum-T#Bouimetarhan, IlhamCounting, palynology
28Euphorbia-typeEup-T#Bouimetarhan, IlhamCounting, palynology
29Rubiaceae spp.Rubiaceae spp.#Bouimetarhan, IlhamCounting, palynology
30GaliumGal#Bouimetarhan, IlhamCounting, palynology
31AlchorneaAlchornea#Bouimetarhan, IlhamCounting, palynology
32IlexIle#Bouimetarhan, IlhamCounting, palynologySchinus/Aquifoliaceae
33Scrophulariaceae/SolanaceaeScrophulariaceae/Solanaceae#Bouimetarhan, IlhamCounting, palynology
34FabaceaeFabae#Bouimetarhan, IlhamCounting, palynology
35RutaceaeRutae#Bouimetarhan, IlhamCounting, palynology
36CaesalpiniaceaeCaesalpiniaceae#Bouimetarhan, IlhamCounting, palynology
37Hedyosmum/ConvolvulaceaeHedyosmum/Convolvulaceae#Bouimetarhan, IlhamCounting, palynology
38AnacardiaceaeAnaae#Bouimetarhan, IlhamCounting, palynology
39AcanthaceaeAcanteae#Bouimetarhan, IlhamCounting, palynology
40Bertiera-typeBertiera-T#Bouimetarhan, IlhamCounting, palynology
41AmbrosiaAmb#Bouimetarhan, IlhamCounting, palynology
42TrichiliaTrichili#Bouimetarhan, IlhamCounting, palynology
43MalvaceaeMalvae#Bouimetarhan, IlhamCounting, palynology
44ArecaceaeArecceae#Bouimetarhan, IlhamCounting, palynology
45MyricaceaeMyrae#Bouimetarhan, IlhamCounting, palynology
46DidynopamaxDidynopamax#Bouimetarhan, IlhamCounting, palynologyEuphorbiaceae
47Sporomorphs indeterminablesSporomorphs indet#Bouimetarhan, IlhamCounting, palynology
48MelastomataceaeMelast#Bouimetarhan, IlhamCounting, palynology
49BurseraceaeBursceae#Bouimetarhan, IlhamCounting, palynology
50Pollen, totalPollen tot#Bouimetarhan, IlhamCounting, palynology
51Spores totalSpores tot#Bouimetarhan, IlhamCounting, palynology
52Pollen and sporesPollen+spores#Bouimetarhan, IlhamCounting, palynologytotal
53Particle, charredParticle charred#Bouimetarhan, IlhamCounting, palynology
933 data points

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