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Short-term variations in the abundance and cell volume of bacterioplankton in an artificial tropical lake

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Abstract

Circadian and spatial fluctuations in bacterioplankton abundance and cell volume were examined, for the first time, in the Municipal Lake located in the down town area of Yaoundé (Capital of Cameroon, Central Africa, ca 3° 52′ N, 11° 31′ E). Bacterial cell volumes (range, 0.05 to 0.2 μm3) were consistent with those reported for other aquatic systems while bacterial densities (0.8 to 2 × 108 cells ml-1) were among the highest values reported in pelagic systems. These variables and chlorophyll a and dissolved oxygen concentrations within a single depth-zone varied from 13 to 61%, while water temperature fluctuated only from 2 to 6%. Spatial fluctuations of physical-chemical and biological variables were generally higher during the day-time than during the night-time. A significant diel variation was provided for bacterial cell volume in the surface waters where synchronized cell division was occurring during the night. The measured bacterial abundances in this study were 4 to 17 fold higher than values known from other lakes of similar trophic status, and both cell abundance and volume were not correlated with chlorophyll. We conclude that this was due to the dependence of bacterial populations to different sources of allochthonous substrates, including untreated sewage from the major influents of the lake, resuspension of benthic material, and substrate releasing from macrophytes which are prevalent in the littoral zone of the lake.

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Authors and Affiliations

  1. Laboratoire de Biologie Comparée des Protistes, UPRES-A CNRS 6023, Université Blaise-Pascal, 63177, Aubière Cedex, France

    Louis B. Jugnia, Rémy D. Tadonléké & Télesphore Sime-Ngando

  2. Laboratoire de Biologie Générale, Faculté des Sciences, Université de Yaoundé I, B.P. 812, Yaoundé, Cameroun

    Samuel M. Foto & N. Kemka

Authors
  1. Louis B. Jugnia
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  2. Rémy D. Tadonléké
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  3. Télesphore Sime-Ngando
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  4. Samuel M. Foto
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  5. N. Kemka
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Correspondence to Télesphore Sime-Ngando.

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Jugnia, L.B., Tadonléké, R.D., Sime-Ngando, T. et al. Short-term variations in the abundance and cell volume of bacterioplankton in an artificial tropical lake. Hydrobiologia 385, 113–119 (1998). https://doi.org/10.1023/A:1003453709384

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