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Polymesoda erosa is a species that lives in mud in estuarine areas, in brackish water mangrove forests and large rivers. The Peniti Village of Mempawah Regency is one of the main hunting grounds of Polymesoda erosa by the community both for self-consumption and for sale. This can affect the population of Polymesoda erosa in the region. The purpose of this study was to determine the density and distribution patterns of Polymesoda erosa using the Systematic Sampling method by dividing the study area into 4 (four) stations. The results showed that Polymesoda erosa totaled 217 individuals, consisting of 43 individuals at the station I, 93 individuals at station II, 41 individuals at station III, and 40 individuals at station IV. The highest polymesoda era at station II (93 individuals), while the lowest at station IV (40 individuals). The highest average density of Polymesoda erosa is found at station II, which is 0.93 ind / m2, while the lowest average density is at station IV which is 0.4 ind / m2. The distribution of Polymesoda erosa is based on the Morisita degree standard value of 0.023, which shows the distribution of Polymesoda erosa is clustered.

Kepadatan dan Pola Distribusi Polymesoda erosa di Ekosistem Mangrove Desa Peniti Kabupaten Mempawah Kalimantan Barat