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Variabilités verticale et temporelle des acides gras d'un phytoplancton lacustre au cours d'un cycle nycthéméral

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Abstract

Vertical and temporal variability in the content and composition of fatty acids in the lake phytoplankton were studied during a diel cycle (48 h). There is temporal variability in total fatty acid (FA) content per biomass unit but it is not strictly diurnal. In contrast, polyunsaturated FA with 20–22 C chains and Σ unsaturated FA/Σ saturated FA ratio are higher during the day than during the night.

The temporal variability was not as great as the variability is between sampling depths characterized by different phytoplankton assemblages. Phytoplankton composition and physiological state were the principal factors affecting FA composition. Thus, a C16:1w7/C18:1w9 ratio distinguishes between diatoms, with a high level of C16 unsaturated FA, and dinoflagellates with C18 unsaturated FA. This ratio was different at the surface and at 20 m depth, where the phytoplankton had the same taxonomic composition but a different physiological activity.

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  1. Laboratoire de Zoologie, U.A. CNRS 040138, Université de Clermont-Ferrand II, B.P. 45, 63170, Aubière, France

    Gilles Bourdier & Christian Amblard

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  1. Gilles Bourdier
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  2. Christian Amblard
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Bourdier, G., Amblard, C. Variabilités verticale et temporelle des acides gras d'un phytoplancton lacustre au cours d'un cycle nycthéméral. Hydrobiologia 157, 57–68 (1988). https://doi.org/10.1007/BF00008810

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  • DOI: https://doi.org/10.1007/BF00008810

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