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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 5 | PAGES 901-921 | 1998
© Oxford University Press

research-article

Seasonal variations of phytoplankton photosynthate partitioning in two lakes of different trophic level

M.F. Charpin1, N. Maurin, C. Amblard and J. Devaux

Laboratoire de Biologie comparée des Protistes UPRES-A 6023, Les Cézeaux, 63177 Aubière cedex, France

1To whom corresponde should be addressed

Received on May 22, 1997; accepted on December 12, 1997 The aim of this study was to compare vertical and seasonal variations of inorganic carbon allocation into macromolecules by the phytoplankton population in a eutrophic lake (Lake Aydat) and an oligo-mesotrophic lake (Lake Pavin). Biochemical fractionation was conducted by consecu tive differential extractions in order to separate proteins, polysaccharides, lipids, and low molecular weight compounds (LMW). The ratio of light absorption at480 and 665 nm by acetone extracts of phytoplankton pigments was used as an indicator of the nutritional statusof natural phytoplankton populations. Our results show that in Lake Aydat, the main photosynthetic end productswere poly saccharides, whereas in Lake Pavin, radioactivity was predominantly incorporated into the protein fraction. Moreover, the seasonal cycles of mixing and stratification in these two lakes affected the pattern of 14C incorporation into LMW and macromolecules. An increase in the relative synthesis of proteins occurred during stratification periods. It was linked to an increase in temperature and nutrient limitation further complicated by the shift in species composition of the populations. Differ ences recorded both between the two lakes of different trophic status and between seasons confirm that the proportion of carbon incorporated into proteins might be a useful indicator of the physio logical status of phvtoplankton communities.


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