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The present study was carried out for the distribution of some Caulerpa species in Thoothukudi region in
the south east coast of Tamil Nadu, India. Caulerpa species were collected seasonally from intertidal and
subtidal regions. Caulerpa species were enumerated at random using a quadrate (0.5m2). A total of five
species of Caulerpa were collected in the study area such as Caulerpa mexicana, Caulerpa racemosa,
Caulerpa scalpelliformis, Caulerpa sertularioides and Caulerpa taxifolia. The frequency and density
were calculated and all the Caulerpa species showed a similar pattern of seasonal variation. Among the
seaweeds collected the highest frequency (68.75%) and density (4.70) were observed in Caulerpa
scalpelliformis during summer season and the lowest frequency (21.25%) and density (1.17) were
recorded in Caulerpa taxifolia during post-monsoon season. In the present study all the Caulerpa species
(Chlorophyceae) exhibited the maximum frequency and density during the summer season followed by the
declined trend was observed in the pre-monsoon and monsoon seasons. During the post-monsoon season
the frequency and density of Caulerpa species (Chlorophyceae) was minimum in the selected region of
the south east coast of Tamil Nadu, India.
Keywords: Frequency, Density, Seasons, Caulerpa.