SESSION 3: AQUATIC BIODIVERSITY
Seasonal Variations in Plankton Population of Kuttanad EcosystemReghunath K. and Thomas Zachariah
Department of Zoology, S.D. College, Allappuzha, Kerala, India
ecosystem is confined to the low-lying area near the coast of Kerala in
Southwest India. Vembanad lake of Kuttanad ecosystem, one of the most unique
region in the coastal zone of Kerala is a nursery for a large number of biota.
In the present study, an attempt was made to evaluate the seasonal variation in
the plankton population of the Vembanad lake and to assess the abundance of such
populations during a period of one year. Both phyto and zooplankton populations
collected from six different stations of Kuttanad ecosystem were analysed. The
results showed that the dominance of total phytoplankton accompanied one higher
peak during pre-monsoon and a peak of diminutive magnitude during monsoon and
post monsoon. Analysis of zooplankton population showed a bimodal pattern of
distribution with one peak during pre-monsoon and the other during post-monsoon.
The variations of the zooplankton communities with time and space achieved the
knowledge on the secondary production of Kuttanad ecosystem and its rich