index gives an indication that Hadhinaru Lake and
Bogadi Lake fall under the category of low organic
pollution(Total score of 14) but are tending to be
organically polluted. The species index also
indicates that all lakes are organically polluted.
Hosmani(2010) studied the phytoplankton
diversity in lakes of Mysore district and no
attempt was made to apply the data to derive
pollution indices.
The Louis-Laclercq(2008) index of pollution
derived from the OMNIDA GB5.3 is presented in
Table 2. The percentage indicators of organic
pollution are very high in Bilikere Lake, Arasankere
Lake, Karnaji Lake, Dalvoi Lake, and Kurabura Lake.
The level of organic pollution is low in Bannur
Heggere Lake and Hadhinaru Lake; it is high in 4
lakes and moderate in 9 other lakes. The table also
depicts the level of disturbance by human activity
(Anthropogenic pollution). Doddakere Lake,
Chikkahunsur Lake and Alagudu Lake are heavily
polluted due to human interference while the rest
of the lakes are highly disturbed. Only 8 lakes are
moderately disturbed. The level of degradation in
these lakes is always high. The index is derived
mainly on the basis of the distribution of diatom
species throughout the period of study. Diatom
cells often remain undissolved for a longer
duration and hence can serve as important
indicators of organic as well as anthropogenic
pollution.