Hydrobiologia

, Volume 443, Issue 1–3, pp 213–231 | Cite as

Modern benthic diatom distribution in a hypersaline coastal lagoon: the Lagoa de Araruama (R.J.), Brazil

  • Florence Sylvestre
  • Beatriz Beck-Eichler
  • Wania Duleba
  • Jean-Pierre Debenay
Article

Abstract

Diatom assemblages identified in 75 surface sediment samples in a shallow hypersaline coastal lagoon (Lagoa de Araruama, R.J., Brazil) are mainly composed of holo-euryhaline and marine euryhaline benthic taxa. The lagoon is characterized by an assemblage dominated by Cocconeis placentula var. euglypta, associated with Catenula adhaerens and Cocconeis diminuta. However, different areas, characterized by specific assemblages, have been identified. Their distribution seems to be related to (1) fluctuations in bathymetry, influenced by water inputs from the ocean and from rivers adjacent to the lagoon; (2) fluctuations in salinity through the influence of marine water and the precipitation–evaporation rate. Moreover, the distribution of associations characterized by the presence of Nitzschia palea, N. pusilla and Fallacia cryptolyra suggests the influence of man-induced activities. Although these diatoms are not dominant, their wide distribution inside the lagoon, favored by local wind-hydrodynamics, suggest a large impact of anthropic activities (e.g. freshwater and organic sewages).

Brazil coastal lagoon hypersalinity diatom modern distribution anthropic impact 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Florence Sylvestre
    • 1
  • Beatriz Beck-Eichler
    • 2
  • Wania Duleba
    • 2
  • Jean-Pierre Debenay
    • 3
  1. 1.UFR Sciences, UPRES-EA 2644, Laboratoire de GéologieUniversité d'AngersAngers cedexFrance
  2. 2.Instituto Oceanographico, Depto. de Oceanografia FísicaUniversidade de São PauloSão PauloBrazil
  3. 3.UFR Sciences, UPRES-EA 2644, Laboratoire de GéologieUniversité d'AngersAngers cedexFrance

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