Environmental Engineering Reference
In-Depth Information
Platyias
were represented each with one species.
The other important group, Lecanidae, was rep-
resented by six species of the genus
Lecane
. In
general, most of the tropical alkaline waters are
dominated by the genus
Brachionus
as it has got
adopted with its large number of species, subspe-
cies and polymorphs to the alkaline conditions of
the waters. The second dominant group,
Cladocera, has been represented with 11 species
belonging to the Chydoridae family with three
genera, viz.
Chydorus
and
Alona
each with four
and
Kurzia
with one species. The other two fami-
lies, Moinidae and Macrothricidae, got one spe-
cies each.
Brachionus diversicornis, B. falcatus, B. qua-
dridentatus, Platyias quadricornis, Lecane
(Lecane) curvicornis, L. (Monostyla) bulla
and
Testudinellidae mucronata
among rotifers and
Ilyocryptus spinifer, Chydorus barroisi,
C. ventricosus, Alona rectangula rectangula
,
A. rectangula richardi
and
A. davidi davidi
are
available in both lakes.
As is quite obvious from the above results,
these two impoundments differed signifi cantly in
their limnological attributes, and these two can
be categorized as oligotrophic lakes. In general,
these two lake waters showed seasonality in most
of the physico-chemical factors which mainly
depend on the monsoon, i.e. insuffi cient rains or
heavy rains in the preceding periods. The
physico-chemical parameters of both lakes are
also indicating that these two are clean waters,
but abnormal values of the nutrients indicate that
these are slightly polluted, and the reason can be
attributed to agricultural runoff or anthropogenic
activities. Both lakes were characterized by
highly alkaline, soft to hard, moderate turbidity,
and the chloride content of these two water bod-
ies indicates their potability.
The parameters like pH, turbidity, dissolved
oxygen (DO), carbonates and silicates are at
higher side in Pocharam Lake than the other,
whereas factors like electric conductivity, bicar-
bonates, chloride, phosphates, sulphates, sodium
and potassium of Wyra Lake were at side but total
hardness and calcium are more or less equal both
the water bodies. The reasons for the variations in
the levels of ranges of physico-chemical parameters
of both lakes can be attributed to the differences
in the quantum of rain fall, domestic sewage that
is letting into the water bodies, agricultural runoff,
anthropogenic activities at the lake basins, etc
.
during the study periods.
Summary
Studies on the comparative study on physico-
chemical and biological characteristics with spe-
cial reference to Rotifera and Cladocera of two
Deccan wetlands, viz. Pocharam Lake and Wyra
Lake, that are situated in Andhra Pradesh have
been carried out during 2003-2004 and 2006-
2007. These studies were conducted on seasonal
basis, i.e. during the winter, summer and monsoon
periods. The abiotic factors revealed that the
parameters like pH, turbidity, DO, carbonates and
silicates are at higher side in Pocharam Lake waters
than the other and factors like electric conductivity,
bicarbonates, chloride, phosphates, sulphur, sodium
and potassium of Wyra Lake waters are at higher
side. But total hardness and calcium values are
more or less equal in both lakes. The biotic factors
revealed the presence of 24 species belonging to
9 genera of Rotifera and 11 species in 5 genera
in Pocharam Lake, while in Wyra Lake it was
20 species under 10 genera of Rotifers and 16
species belonging to 9 genera of cladocerans.
Acknowledgements
The author is thankful to the
Offi cer-in-Charge, Zoological Survey of India, Hyderabad,
and Director, Zoological Survey of India, Kolkata, for
extending facilities in writing this chapter.
References
Anitha G, Chandrasekhar SVA, Kodarkar MS (2005)
Hydrography in relation to benthic macroinvertebrates
in Mir Alam lake. Records of the Zoological Survey of
India, Hyderabad, Occ. paper 235
Chandrasekhar SVA (1996) Ecological studies on
Saroornagar lake, Hyderabad. PhD thesis, Osmania
University, Hyderabad
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