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- W1969991567 abstract "This paper illustrates the different types of information which can be deduced from African diatoms studies. The first section is devoted to the reconstruction of palaeoenvironments. The accuracy of ecological data (estimates of ecological variables e.g. types of habitats, water chemistry…) depends on the times scale and on the spatial scale considered: short-term environments in a given waterbody, environmental evolution during individual humid episodes considered locally or regionally, long-term changes in diatom flora induced by major climatic tendencies at a regional or continental scale. One then summarizes our present state of knowledge in diatom biostratigraphy in Africa. Several centric taxa, belonging to the genera Aulacoseira, Mesodictyon, Cyclotella, Stephanodiscus and Cyclostephanos appear to have limited stratigraphical ranges and to be good chronological markers. Cet article illustre les différents types d'informations que nous pouvons déduire de l'étude des diatomées fossiles d'Afrique. La reconstruction des paléomilieux peut être envisagée à différentes échelles de temps et d'espace : variations saisonnières dans un lac donné, évolution de l'environment aquatique au cours d'un épisode climatique humide à l'échelle d'un bassin ou d'une région, changements à long terme des conditions hydrologiques et climatiques régionales ou sur une grande partie du continent. L'étude de séquences lacustres anté-quaternaires a permis d'établir les premiers jalons d'une biostratigraphie des diatomées africaines. Plusieurs taxons de diatomées centriques appartenant aux genres Aulacoseira, Mesodictyon, Cyclotella, Stephanodiscus et Cyclostephanos ont une distribution stratigraphique limitée et paraissent être de bons marqueurs chronologiques." @default.
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- W1969991567 date "1991-01-01" @default.
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- W1969991567 title "African diatom palaeoecology and biostratigraphy" @default.
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- W1969991567 doi "https://doi.org/10.1016/0899-5362(91)90081-9" @default.
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