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The population abundance,
distribution pattern and culture studies of isolated
microalgal strains from selective sampling sites along the
south east coast of India
Srinivasakumar, K. P.* and Rajasekha, M.
Department
of Biosciences, Mangalore University, Mangala Gangothri,
Karnataka, India – 576199.
*Corresponding author.
E-mail:
srinibiotech@yahoo.co.in.
Tel.: 0091
9243476083. Fax: 0091 80 66261275.
Accepted 25
May, 2009 |
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The present study was conducted to understand the microalgal
dynamics and surveillance in the selective sites along the
south east coast of India. Algal isolation was carried out
in 61 sampling stations characterized by different
ecological features. In total 10 microalgal species were
isolated under laboratory condition from the collected
samples. The composition of microalgal distribution and
their surveillance were related to the environmental factors
are discussed in the present paper. From the results it was
observed that Isochrysis galbana [MA1] has the
maximum surveillance at 37 spots [60.7%]. It was also
observed that 25.7% of the collection spots may share same
microalgal dynamics and surveillance. In order to understand
the better background information about the importance of
culture condition in the optimal growth of microalgal
strains, experimental setup were designed using modified
Walne’s and Guillard f/2 medium. Studies were also carried
out to understand the relation between the growth conditions
and environmental factors including salinity, temperature,
pH and dissolved oxygen. The growth study was further
designed by providing the culture setup with 2 different
light : dark illustration of 24:0 with 1000 lux setup and
16:8 with 1000 lux. The results show 70% of the isolated
samples grown in Walne’s medium and 60% of samples grown on
guillard’s f/2 medium prefer to grow optimally under 16:8
light: dark illustration. It was also observed that Walne’s
medium encourages better growth for the collected microalgal
samples when compared with the Guillard’s medium.
Key
words:
Microalgae, inoculum, phytoplankton, dissolved oxygen, GPS. |
