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Abstract. Brackish-water mollusks inhabiting the mangrove areas along the Gulf of Thailand of Surat ThaniProvince were investigated for distribution, abundance and natural infections. Nine families and 32 species ofbrackish-water snails were recovered from 14 sampling stations. Species belonging to the genus Ceritidea of thefamily Potamididae were mainly examined and Cerithidea (Cerithideopsilla) Cingulata, C. (C.) djadjariensis,and C. (Cerithidea) charbonnieri were naturally infected with 2 types of trematode cercariae, and one which wasundetermined. C. (C.) cingulata had the highest infection rate (38.5%). Viewing two snail communities, thefirst community on the mainland and the second on Samui Island in Surat Thani Province, 28 brackish-watermollusk species were present on the mainland, 15 species were evident on Samui Island, and 11 snail specieswere common to both the mainland and Samui Island. Measurement of community similarity based on speciespresence revealed an index of similarity of 0.51. Concerning land use by the local people in the station areasinvestigated, brackish-water snails in Surat Thani Province are facing habitat degradation by human use.
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