Study
of Planktonic forms of lakes of Mysore city
“Phytoplankton”
is the collective name for the group of microscopic, aquatic photosynthetic
organisms which are abundant in freshwater Lakes. During favourable conditions
dense aggregations called “blooms” occurs which often causes fish kills or
render the water unfit for any use. They have very high biological activity and
are important is sustaining life in Lake waters. They are influenced by
climatic changes and by variations in the physical and chemical constituents of
the water and the uncontrolled conditions lead to water pollution.
The
presence of phytoplankton in freshwater bodies is a widely accepted indicator
of water quality. However, identification of the algal species, the knowledge
of the algal cell number, or the physiological state of cells may also be
important in providing a true picture of the water quality or trophic state.
The
samples from both the lakes were collected in 30 mL vials. Few drops of Lugol’s
iodine and few drops of 4% formaldehyde were added. The preserved samples were
observed under microscope.
In
the present study, lakes of Mysore district have been selected. Five different
groups of phytoplankton applicable to water bodies have been analyzed. The
smaller phytoplankton organisms can be readily identified. In order to
facilitate identifications of the organisms at sea, an atlas of diatoms,
dinoflagellates and myxophyceae of the region has been prepared.
1. Phytoplankton
were identified from Lake water belonging to four taxonomic assemblages:
Cyanophyceae – Microcystis, Oscillatoria,
etc.
2. Chlorophyceae
- Ulothrix, Oedogonium, Bulbochaetae,
Pediastrum, Eudorina, Spirogyra, Closterium, Staurastrum and Cosmarium.
3. Bascillariophyceae-
Navicula, Synedra, Cymbella and Pinnularia
4. Euglenophyta
– Euglena and Phacus.
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