Pollen counts of sediment core GeoB16205-4 from Parnaiba, NE Brazil
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2018
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| _version_ | 1867169127838253056 |
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| author | Bouimetarhan, Ilham Chiessi, Cristiano Mazur González-Arango, Catalina Dupont, Lydie M Voigt, Ines Prange, Matthias Zonneveld, Karin A F |
| author_facet | Bouimetarhan, Ilham Chiessi, Cristiano Mazur González-Arango, Catalina Dupont, Lydie M Voigt, Ines Prange, Matthias Zonneveld, Karin A F |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_889701 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Pollen counts of sediment core GeoB16205-4 from Parnaiba, NE Brazil Bouimetarhan, Ilham Chiessi, Cristiano Mazur González-Arango, Catalina Dupont, Lydie M Voigt, Ines Prange, Matthias Zonneveld, Karin A F 056-4; Acacia; Acanthaceae; AGE; Alchornea; AMADEUS; Amaranthaceae/Chenopodiaceae; Ambrosia; Anacardiaceae; Arecaceae; Artemisia; Asteroideae; Bertiera-type; Borreria; Boscia-type; Burseraceae; Caesalpiniaceae; Cassia-type; Celtis; Center for Marine Environmental Sciences; Continental Slope Northeast Brazil; Counting, palynology; Cyperaceae; DEPTH, sediment/rock; Didynopamax; Ephedra distachya-type; Ephedra fragilis-type; Euphorbia-type; Fabaceae; Galium; GeoB16205-4; Gramineae; Gravity corer (Kiel type); Hedyosmum/Convolvulaceae; Ilex; Malvaceae; Maria S. Merian; MARUM; Melastomataceae; Mimosa-type; Mitracarpus; MSM20/3; Myricaceae; Particle, charred; Phyllanthus-type; Piliostigma; Plantago; Podocarpus; Pollen, total; Pollen and spores; Rhizophora; Rubiaceae spp.; Rutaceae; Scrophulariaceae/Solanaceae; SL; Spores total; Sporomorphs indeterminables; Stereospermum-type; Trichilia; Typha; Vernonia-type; Ziziphus 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. |
| title | Pollen counts of sediment core GeoB16205-4 from Parnaiba, NE Brazil |
| topic | 056-4; Acacia; Acanthaceae; AGE; Alchornea; AMADEUS; Amaranthaceae/Chenopodiaceae; Ambrosia; Anacardiaceae; Arecaceae; Artemisia; Asteroideae; Bertiera-type; Borreria; Boscia-type; Burseraceae; Caesalpiniaceae; Cassia-type; Celtis; Center for Marine Environmental Sciences; Continental Slope Northeast Brazil; Counting, palynology; Cyperaceae; DEPTH, sediment/rock; Didynopamax; Ephedra distachya-type; Ephedra fragilis-type; Euphorbia-type; Fabaceae; Galium; GeoB16205-4; Gramineae; Gravity corer (Kiel type); Hedyosmum/Convolvulaceae; Ilex; Malvaceae; Maria S. Merian; MARUM; Melastomataceae; Mimosa-type; Mitracarpus; MSM20/3; Myricaceae; Particle, charred; Phyllanthus-type; Piliostigma; Plantago; Podocarpus; Pollen, total; Pollen and spores; Rhizophora; Rubiaceae spp.; Rutaceae; Scrophulariaceae/Solanaceae; SL; Spores total; Sporomorphs indeterminables; Stereospermum-type; Trichilia; Typha; Vernonia-type; Ziziphus |
| url | https://doi.org/10.1594/PANGAEA.889701 |