Environmental Engineering Reference
In-Depth Information
Table 6.6
Number of rotifer species shared between
sites
Station
Table 6.8
Seasonal diversity of rotifers at various sam-
pling stations of River Vishwamitri during 2002-2004
I (37)
II (33)
III (40)
IV (12)
IV (10)
Species diversity
Sampling
station
Species
richness
H
Ą
I
-
24
21
11
8
D
Equitability
II
-
-
20
11
8
(a) Summer
I
III
-
-
-
9
9
7
1.27
1.52
0.49
IV
-
-
-
-
7
II
-
-
-
-
V
-
-
-
-
-
III
11
1.88
1.62
0.62
IV
1
0.17
0.11
0.24
V
1
0.19
0.12
0.08
Table 6.7
Rotifer community similarity (
C
j
) between
the stations
Station
(b) Post-monsoon
I
23
2.56
2.91
0.63
I
II
III
IV
V
II
17
2.30
2.63
0.57
I
-
0.52
0.38
0.29
0.21
III
14
2.31
2.21
0.57
II
-
-
0.38
0.32
0.23
IV
5
1.48
1.01
0.30
III
-
-
-
0.21
0.22
V
4
1.18
0.84
0.29
IV
-
-
-
-
0.47
(c) Winter
I
V
-
-
-
-
-
3
0.59
0.39
0.14
II
4
1.27
0.58
0.31
III
6
1.36
1.03
0.35
of species diversity, while lowest diversity was
found during the winter months at all stations
except IV and V (Table
6.8
). Station I recorded
the highest diversity in the month of September
and the lowest in January. At station II also the
months of August and September high rotifer
species diversity was observed which, however,
began to reduce by October and reached
minimum levels in the month of December.
Station III showed less variation in the rotifer
diversity throughout the year; however, on the
whole, the post-monsoon months had the highest
levels of rotifer diversity, followed by the month
of May. Stations IV and V had very low levels
of rotifer diversity as compared to the other
three stations.
IV
3
0.72
0.54
0.18
V
2
0.57
0.30
0.14
temperature values were recorded during winter
and ranged from 13.0 to 19.7 °C (Table
6.9
).
At all the stations, the month of January recorded
the least temperature values. The temperature
during the post-monsoon season was moderate and
ranged between the summer and the winter values.
Station I recorded the lowest mean post-monsoon
value, while station IV recorded the highest mean
post-monsoon temperature (Table
6.9
).
p H
The mean pH values of the river varied between
7.51 and 9.01 during the study period. Station I
did not show much variation in the pH levels, the
maximum value of 7.89 was obtained during the
month of April, while the lowest value was
observed in August and September. Likewise at
station II, the values varied only between 7.60 in
August and September and 7.91 in December.
At station III, slight increase in the variation was
observed with values ranging from 7.49 to 8.05.
The highest pH value of 9.01 was recorded
from station IV in the month of May. Here the
lowest recorded pH value was 7.59 in the month
of September. The pH values at station V ranged
Physicochemical Parameters
Temperature
The temperature of the river water varied with
changes in the ambient temperature at all the
stations. As expected the highest values were
obtained in the summer months with April having
the maximum temperature values (Table
6.9
).
Station V showed the highest mean summer
temperature followed by station IV and then by
station I and lastly by station III. The lowest
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