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Sub-fossil diatoms from the Saloum Estuary, Senegal, West Africa: Floristic inventory and paleo-productivity evolution along the Ndangonkha core

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dc.contributor.author Gueye, Adama
dc.contributor.author Fofana, Abdoul Kader
dc.contributor.author Badiane, Insa
dc.contributor.author Carré, Matthieu
dc.contributor.author Youm, Ibrahima
dc.contributor.author Sow, El Hadji
dc.coverage.spatial Estuario de Saloum, Palmarin, Senegal
dc.date.accessioned 2023-04-16T04:38:16Z
dc.date.available 2023-04-16T04:38:16Z
dc.date.issued 2023
dc.identifier.uri https://hdl.handle.net/20.500.12866/13405
dc.description.abstract As part of our program to reconstruct the estuaries and lagoons history in Senegal and the diatom microflora inventory in Sene-Gambia, a 400 cm long core was taken at Ndangonkha in the Saloum Estuary, near Foundiougne. The dating obtained showed that sedimentation began during the Nouakchottian age, around 6000 years BP, with an average rate of sedimentation higher at the base than at the top where the high hydrodynamics of the environment would have caused sediment reworking. The comparative analysis of the lithology and the microflora showed a perfect correlation between the lutite fraction, the absolute abundance of diatoms and their specific richness. The study involved an inventory of 110 species and varieties belonging to 62 genera. The most represented genera being Nitzschia (10 species) and Cyclotella and Diploneis (5 species each). Five species are cited for the first time in Sene-Gambia and 61 species are also reported from Ndangane Babou. The microflora is dominated by euryhaline forms headed by Cyclotella striata. This dominance could be linked to the frequent variations in salinity between the rainy and dry seasons, while the abundance of marine species could be related to the dominant influence of marine waters. The rare freshwater species encountered could be brought by wind, insects or birds. The analysis of the microfloristic and lithological data showed that the primary paleo-productivity and the specific richness are weak at the base but showed an increase upwards. They are high in zone A, maximum in zone C whereas in zone D they are decreasing before disappearing in the last 10 cm, in relation to the hydrodynamics of the environment. © 2023 Elsevier Ltd en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Journal of African Earth Sciences
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject biodiversity en_US
dc.subject dating method en_US
dc.subject Diatoms en_US
dc.subject Estuary en_US
dc.subject Fatick en_US
dc.subject floristics en_US
dc.subject fossil en_US
dc.subject Hydrodynamics en_US
dc.subject lagoon en_US
dc.subject lithology en_US
dc.subject Paleo-biodiversity en_US
dc.subject Paleoproductivity en_US
dc.subject salinity en_US
dc.subject Saloum Estuary en_US
dc.subject sedimentation en_US
dc.subject Senegal en_US
dc.title Sub-fossil diatoms from the Saloum Estuary, Senegal, West Africa: Floristic inventory and paleo-productivity evolution along the Ndangonkha core en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.jafrearsci.2023.104832
dc.relation.issn 1464-343X


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