Mangrove rehabilitation program is one of the solutions to restore
the mangrove ecosystem damaged due to the tsunami and later
on mangrove biota including Gastropods and Bivalves will return
back to this ecosystem. Ashton et al (2003) and Aksornkoae
(1993) mentioned that anthropogenic and natural disturbance
often result in diversity loss to natural ecosystem and loss of
diversity have a significant effect on ecosystem functioning.
Biological indices
The diversity index (Shannon index) has varied from 0.51 to
2.95 at site 5 and site 1, respectively, with average of 2.02 indicating
a low value. The evenness index (E) has varied from
0.26 to 0.85 with an average of 0.58 (Figure 2). These average values indicate that the community condition was unstable.
However, the mollusk community at site 1 was relatively stable
compared to other sites.