Hydrobiologia

, Volume 215, Issue 3, pp 251–260 | Cite as

Aspects of winter primary production in the upstream section of Saguenay Fjord

  • Raynald Chassé
  • Raynald Côté
Article

Abstract

From August 1985 to May 1986, experiments on primary production were carried out bi-weekly in the superficial waters (1–10 m) at one representative station (maximum depth of 260 m) located at the head of the Saguenay Fjord. During the winter season (January–March), the microalgal cells are abundant but their productivity is low. At the beginning of the snow-ice cover (January) the cells are mainly concentrated in the ice-cover interface and in the surface waters whereas in February–March, the cells are much more abundant in the ice. Results showed that the physico-chemical conditions are unfavourable for high productivity. The quantity and the quality of light under the ice cover are not the only factors limiting the photosynthetic activity of epontic community. The ice interior and epontic communities during the winter are mostly composed of the two euryhaline speciesAsterionella formosa andTabellaria fenestrata.

Key words

Saguenay Fjord phytoplankton winter primary production 

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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Raynald Chassé
    • 1
  • Raynald Côté
    • 2
  1. 1.INRS-EauSainte-FoyCanada
  2. 2.Département des sciences fondamentalesUniversité du Québec a ChicoutimiChicoutimiCanada

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