Growth and periodicity of cyanobacterial bloom in a polluted pond of Agra city
Ashesh Tiwari
and S.V.S. Chauhan*
School of Life
Sciences, Depatrment of Botany,? Dr. B. R. Ambedkar University, Agra -
282 002, India
(Received: June 15, 2006; Revised
received: February 20, 2007; Accepted: March 28, 2007)
Abstract:
Periodical changes in physico-chemical properties and
cyanophycean bloom in a pond of Agra city during the year 2005 and 2006 were
studied. It was recorded that the pond water was polluted throughout the study
period and this was closely associated with cyanobacterial bloom. During
summer (March to June), the pond water was highly polluted, as it was rich in
various nutrients and phosphates in particular. The pH of pond water was high
with low DO and this was associated with the highest peak of water bloom.? On the other hand, during winter (November to
January), the bloom was at its lowest. The quantity of various nutrients in the
pond water was low and the pH was also low but DO was high.? Bloom consisted of eighteen members of Cyanophyceae of which Oscillatoria
limosa, O. formosa,
O. splendida, Anabeana iyengarii, Microcystis arruginosa and Nostoc muscorum were observed throughout the year. On the other
hand, Oscillatoria agardhi,
and O. tenuis were found only in winters, while O.annae in rainy season only. Similarly, Oscillatoria brevis, Anabaena flos-aquae, Aphanizomenon sp. and
Lyngybea birgei were found
in abundance in summer.
Key
words:?? Cyanobacterial bloom, Pond
PDF of full length paper is
available with author (*svs250@rediffmail.com)
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