The present study aims to detect morphological abnormalities in Zygnema sp. because this test
species have high adaptive capacity in unfavourable environmental stress. This alga is inhabited at
the suburban bank of river Ganga, West Bengal, India. The study was done at experimental sites,
downstream at Khardah near sewage water mixing area was compared with upstream control site
Kalyani as no sewage water discharge. External and internal abnormal morphology such as
undulating or wavy and extra outgrowth on cell wall, sometimes bending inwardly and outwardly as
external deformities while internal anomalies such as pigment loss, nucleus was in circular,
rectangular, oval and amoeboid shapes, also vacuolated and trilobed, broom like chloroplasts and
central part of the thallas dried in between two segments. It was observed that this test species was
surviving and well adapted with above mentioned deformities. The present preliminary study with
Zygnema sp. can be utilized for in situ and ex situ indicator species for riverine biomonitoring.
Further research may be relevant to know both tolerant and sensitive algae species inhabited at the
river Ganga bank alongwith biochemical and genetic parameters. The present work is suggesting
that other inhabiting algae and this adaptive test species can be used for bioremediation of
pollutants.
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