Table 4.1. Indices of density of microflora in aquatic habitats with different trophicallevels
Trophicallevel of basin
Cell volume and density indices
Nominal
Parameters
In water
In bottom sediments
Cpt
TPM
N
V
B
N
V
B (mg cm~3)
(10 6
ml~l)
(11 3
)
(10 9
cm 3
)
(11 3
)
Wet gm~3
Carbon mgm~3
Wet
Carbon
Hypereutrophic
>2
>4
8-20
0.25
2-8
400-1600
5-20
0.3
>1.5
>0.4
Eutrophic
>1
>1.5
>4
0.15
>0.6
>120
>1
0.2
>1.0
>0.04
Mesotrophic
>0.3
>0.3
>0.4
0.12
>0.05
>10
>0.5
0.15
>0.1
>0.02
Oligotrophic
<0.3
<0.3
<0.4
0.08
<0.05
<10
<0.5
0.10
<0.1
<0.02
N, numerical abundance of microbes;
V, average volume of their cells:
B, their biomass; parameters, characterizing the trophicallevel of water basins: primary production Cplo
g C m- 2
day-' and total plankton respiration TPM mg 0,
t' day-l
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