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Pinnularia and Navicula often bloom during
autumn. The surface water is often red during dry
season, possibly due to the red pigment in
cyanobacteria.
Zooplankton
Studies revealed the occurrence of 18 species
of zooplankton consisting of two species each
of Protozoa and Copepoda, six species of
Rotifera and eight species of Cladocera.
Occurrence of Arcella sp. amongst the protozoans and Brachionus calyciflorus amongst
the rotifers indicates eutrophy of the wetland.
Two protozoans, namely, Arcella sp. and
Paramoecium sp., represented c 11.11 % of
the total zooplanktonic taxa in the wetland.
Verma and Dalela had reported Arcella sp. in
eutrophic waters. Six rotifers contributed to
33.33 % of the total zooplanktonic taxa, of
which Filinia sp. and Lecane sp. were found to
be abundant. The identified Copepods included
the Cyclops sp. and the Diaptomus sp., and
they represented c 11.11 % of the total zooplanktonic taxa. The total zooplanktonic count
was found to be 68 ± 45 units/l (Kar and
Barbhuiya 2004 ).
Plate 20.2 Chatla Haor at FSL
River Baluchhara
River Ghagra
Fig. 20.2 Chatla Haor
20 Wetlands of India