Sub-fossil diatoms from Hann Park Pond, Dakar, Senegal: floristic inventory and palaeo-environmental reconstruction.
Diatoms in a 1-m core from a pond in Hann Forest Park, western Senegal, were studied with the aim of
reconstituting this interdune depression’s history, particularly the human influence, during the last century.
Sixty-three species and varieties of diatoms belonging to 32 genera were identified, of which twelve are reported
for the first time in Senegambia. The genera most represented were Nitzschia (10 species), Eunotia (9 species)
and Pinnularia (6 species). The microflora was characterised by a dominance of epipelic, epiphytic and aerophilic
species. Diatom assemblage analyses, combined with lithological core data, showed that the pond has remained
very shallow throughout its evolution. The disappearance of acidophilic species and the development of
mesosaprobes and mesoeutrophic alkaliphic species in the upper part of the core can be attributed to organic
pollution caused by human activities, which resulted in eutrophication of the pond waters since the beginning of
the 20th century.
Auteur(s) : Badiane (I), Sow (EH), Fofana (CAD) and Aw (C)
Pages : 319-327
Année de publication : 2016
Revue : African Journal of Aquatic Sciences
N° de volume : 41 (3)
Type : Article
Mise en ligne par : SOW El Hadji