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Bouimetarhan, Ilham; Dupont, Lydie M; Kuhlmann, Holger; Pätzold, Jürgen; Prange, Matthias; Schefuß, Enno; Zonneveld, Karin A F (2015): Pollen and spore counts of sediment core GeoB12624. PANGAEA, https://doi.org/10.1594/PANGAEA.835316, Supplement to: Bouimetarhan, I et al. (2015): Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania). Climate of the Past, 11(5), 751-764, https://doi.org/10.5194/cp-11-751-2015

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Abstract:
In tropical eastern Africa, vegetation distribution is largely controlled by regional hydrology, which has varied over the past 20 000 years. Therefore, accurate reconstructions of past vegetation and hydrological changes are crucial for a better understanding of climate variability in the tropical southeastern African region. We present high-resolution pollen records from a marine sediment core recovered offshore of the Rufiji River delta. Our data document significant shifts in pollen assemblages during the last deglaciation, identifying, through changes in both upland and lowland vegetation, specific responses of plant communities to atmospheric (precipitation) and coastal (coastal dynamics and sea-level changes) alterations. Specifically, arid conditions reflected by a maximum pollen representation of dry and open vegetation occurred during the Northern Hemisphere cold Heinrich event 1 (H1), suggesting that the expansion of drier upland vegetation was synchronous with cold Northern Hemisphere conditions. This arid period is followed by an interval in which forest and humid woodlands expanded, indicating a hydrologic shift towards more humid conditions. Droughts during H1 and the shift to humid conditions around 14.8 kyr BP in the uplands are consistent with latitudinal shifts of the intertropical convergence zone (ITCZ) driven by high-latitude Northern Hemisphere climatic fluctuations. Additionally, our results show that the lowland vegetation, consisting of well-developed salt marshes and mangroves in a successional pattern typical for vegetation occurring in intertidal habitats, has responded mainly to local coastal dynamics related to marine inundation frequencies and soil salinity in the Rufiji Delta as well as to the local moisture availability. Lowland vegetation shows a substantial expansion of mangrove trees after ~ 14.8 kyr BP, suggesting an increased moisture availability and river runoff in the coastal area. The results of this study highlight the decoupled climatic and environmental processes to which the vegetation in the uplands and the Rufiji Delta has responded during the last deglaciation.
Coverage:
Latitude: -8.234160 * Longitude: 39.752660
Date/Time Start: 2008-02-23T06:34:00 * Date/Time End: 2008-02-23T06:34:00
Minimum DEPTH, sediment/rock: 0.02 m * Maximum DEPTH, sediment/rock: 5.92 m
Event(s):
GeoB12624-1 (M75/2_115-1) * Latitude: -8.234160 * Longitude: 39.752660 * Date/Time: 2008-02-23T06:34:00 * Elevation: -655.0 m * Recovery: 6 m * Location: Area South of Mafia Island * Campaign: M75/2 * Basis: Meteor (1986) * Device: Gravity corer (Kiel type) (SL) * Comment: off the Rufiji Delta
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1AGEAgeka BPGeocode
2DEPTH, sediment/rockDepthmGeocode
3GramineaeGraae#Bouimetarhan, IlhamCounting, palynology
4CyperaceaeCypae#Bouimetarhan, IlhamCounting, palynology
5RhizophoraRhiz#Bouimetarhan, IlhamCounting, palynologyRhizophoraceae
6TyphaTyp#Bouimetarhan, IlhamCounting, palynologyTyphaceae
7OleaOle#Bouimetarhan, IlhamCounting, palynologyOleaceae
8PodocarpusPod#Bouimetarhan, IlhamCounting, palynology
9ArtemisiaArt#Bouimetarhan, IlhamCounting, palynology
10AsteroideaeAsteroideae#Bouimetarhan, IlhamCounting, palynology
11Amaranthaceae/ChenopodiaceaeChen/Amar#Bouimetarhan, IlhamCounting, palynology
12PlantagoPla#Bouimetarhan, IlhamCounting, palynology
13CaryophyllaceaeCphae#Bouimetarhan, IlhamCounting, palynology
14AcaciaAca#Bouimetarhan, IlhamCounting, palynology
15Boscia-typeBoscia-T#Bouimetarhan, IlhamCounting, palynology
16ZiziphusZiziphus#Bouimetarhan, IlhamCounting, palynology
17Mimosa-typeMimosa-T#Bouimetarhan, IlhamCounting, palynology
18BorreriaBorreria#Bouimetarhan, IlhamCounting, palynology
19CeltisCel#Bouimetarhan, IlhamCounting, palynology
20CombretaceaeComeae#Bouimetarhan, IlhamCounting, palynology
21IndigoferaIndigofera#Bouimetarhan, IlhamCounting, palynology
22PiliostigmaPiliosti#Bouimetarhan, IlhamCounting, palynology
23Pterocarpus-typePterocarpus-T#Bouimetarhan, IlhamCounting, palynology
24Rhus-typeRhu-T#Bouimetarhan, IlhamCounting, palynology
25Tamarindus-type indicaTamarindus-T indica#Bouimetarhan, IlhamCounting, palynology
26Vernonia-typeVernonia-T#Bouimetarhan, IlhamCounting, palynology
27Stereospermum-typeStereospermum-T#Bouimetarhan, IlhamCounting, palynology
28Psydrax-type subcordataPsydrax subc#Bouimetarhan, IlhamCounting, palynologyRubiaceae
29UapacaUapaca#Bouimetarhan, IlhamCounting, palynology
30Euphorbia-typeEup-T#Bouimetarhan, IlhamCounting, palynology
31IsoberliniaIsoberlinia#Bouimetarhan, IlhamCounting, palynologyBerlina/Isoberlinia
32Cassia-typeCassia-T#Bouimetarhan, IlhamCounting, palynology
33CleomeCleome#Bouimetarhan, IlhamCounting, palynologyCleome-type
34ButyrospermumButyrosp#Bouimetarhan, IlhamCounting, palynology
35HymenocardiaHymenoca#Bouimetarhan, IlhamCounting, palynology
36PhyllanthusPhyllant#Bouimetarhan, IlhamCounting, palynologyPhyllanthus-type
37AlchorneaAlchornea#Bouimetarhan, IlhamCounting, palynology
38GaliumGal#Bouimetarhan, IlhamCounting, palynology
39SporesSpo#Bouimetarhan, IlhamCounting, palynologytotal
40AlgaeAlg#Bouimetarhan, IlhamCounting, palynologytotal fresh water
41Lycopodium spores addedLyc.added#Bouimetarhan, IlhamCounting, palynology
42Lycopodium spores countedLyc.counted#Bouimetarhan, IlhamCounting, palynology
43Pollen totalPollen tot#Bouimetarhan, IlhamCounting, palynology
Size:
1621 data points

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