Our diffirential quntitative data allows us to make one more interesting
calculation. Here I tried to estimate the distribution of biovolumes of
large, medium-sized and small amoebae in the sediments. For estimation of
the cell volume I used the ration between cell volume and nuclear
diameter, calculated by Rogerson and co-workers in 1994. The data show
that in no case small amoebae represents the most of biovolume. This
may be the results of overlooking of smallest amoebae (which is less probbale,
as methods used in this study isolates small species even better than
large and medium-sized) or (which is more probable) the result of the
general specificity of freshwater amoebae fauna.
Generally, freshwater amoebae are larger than marine. There are
much less small (below 25 microns) specis, then in marine habitats.
Data on strong domination of small amoebae are obtained from the studies of
marine plankton and benthos and it seems to be the specifity of marine
ecotops. Anyway, in freshwater benthos medium sized species seems to
dominate strongly from all points of view.