Ref ID : 7231
Jean-Francois Carrias, Christian Amblard, and Gilles Bourdier; Vertical and temporal heterogeneity of planktonic ciliated protozoa in a humic lake. J.Plankton Research 16(5):471-485, 1994
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Seasonal population dynamics and the vertical distribution of ciliates were studied in relation to the particular food resources occurring in a humic and moderately acidic lake (Lake Vassiviere). The abundance (1.4x10E3-20.4x10E3 cells l-1, mean 4.8x10E3 cells l-1) and biomass (0.5-34.6 µgC l-1, mean 6.0 µgC l-1) of ciliated protozoa were low and close to values reported for oligotrophic environments. The species composition of the population varied greatly with depth. Whereas large-sized species of oligotrichs, some of which were mixotrophic, dominated at the surface, haptorids were best represented in deep waters. The spatial distribution of the various groups of ciliates was largely determined by light and the vertical distribution of microbial food resources (detritus, bacteria, algae) within the water column of this brown-colored lake.