Cilacap Mangrove Forest is the largest mangrove ecosystem in java. Some diffirences in term of
environmental condition are founded among that ecosystem as a result of sedimentation, deforestation,
industrial activity and conservation. Those differences could lead the difference of associated gastropod
community in term of their diversity. The aim of this research was to know the diversity pattern of mangrove
gastropod community of Cilacap mangrove ecosystem
Study site was divided into 5 station based on the dominant vegetatiotL mangrove consentation, the
presence of polluting activity and acretion phenametu, Transects and plots were used to talcc the best
representation of sampling by giving 5 transects and 5 altemating plat (size 4X4 m) for each transect in every
station, Transects were pl,aced perpendicular to the riverlcoast line. Diversity indexcs were then calculated
according to Shannon-Wiener formul.a
The result showed tlwt the highest diversity was founded in the non-accretb station, follovyed by
consematian station, accretic station, polluted statian and the least was Nypa-domiruted station, Soil ottdwater
salinity, pollution, rnangrove snge and its species richness were the main environmental factor driving the
absence or presence of the gastropod species, thus influenced the community diversity.
Key words: Mangrove gastropott, iliversity poftern, Cilrcap mangrove ecosystem
