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The micro plankton of the gulf of marseilles phyto plankton pigments production estimations






Tethys 7(2-3): 137-168

The micro plankton of the gulf of marseilles phyto plankton pigments production estimations

Following a detailed description of the method used, the seasonal, interannual, local and vertical variations of the chlorophyll a concentration in the sea near Marseilles, and then more rapidly, those concerning chlorophylls b and c and plant carotenoids are reported. As a whole, these results are similar to the data of the microscopic examination of microplankton populations, but these data exhibited a more pronounced amplitude of variation. The chlorophyll content of cells is apparently maximum during winter and minimum during summer. There are also important variations from year to year and from station to station; the poorest are the years and the stations, the richest in chlorophyll a are the cells. The results of pigment analysis were used to give biomass estimations (in order to compare them with those derived from cell plasmic volume calculations) and to predict gross photosynthetic production according to Ryther. That method leads to the following annual values for 1964:82 g C m-2 at station G and 60 g C m-2 at station H. The variations of that gross production are compared with net production computed from biomass estimations (Utermohl's method). Variations of the ratio of gross production to that biomass are also studied. The values of this ratio exhibit an annual cycle, with a maximum during warm season and a minimum at the end of winter and during spring.


Accession: 006718231



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