Brackish-water mollusks of Surat Thani Province, southern Thailand.

Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Road, Bangkok 10400, Thailand.
The Southeast Asian journal of tropical medicine and public health (Impact Factor: 0.72). 02/2005; 36 Suppl 4:180-8.
Source: PubMed


Brackish-water mollusks inhabiting the mangrove areas along the Gulf of Thailand of Surat Thani Province were investigated for distribution, abundance and natural infections. Nine families and 32 species of brackish-water snails were recovered from 14 sampling stations. Species belonging to the genus Ceritidea of the family 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 was undetermined. C. (C.) cingulata had the highest infection rate (38.5%). Viewing two snail communities, the first community on the mainland and the second on Samui Island in Surat Thani Province, 28 brackish-water mollusk species were present on the mainland, 15 species were evident on Samui Island, and 11 snail species were common to both the mainland and Samui Island. Measurement of community similarity based on species presence revealed an index of similarity of 0.51. Concerning land use by the local people in the station areas investigated, brackish-water snails in Surat Thani Province are facing habitat degradation by human use.

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    • "Faunus ater is a common, usually locally abundant, relatively large, aquatic snail found in fresh to slightly brackish water in the Indo-West Pacific, with fossil records indicating a Tethyan origin (Houbrick, 1991). It is widely distributed in India, Sri-Lanka, Andaman Islands, Myanmar, both sides of the Thai and Malay Peninsula, Singapore, Indonesia, the Philippines, New Guinea, western and southern Pacific Islands, northern Australia and China (Solem, 1953; van Benthem Jutting, 1956; Brandt, 1974; Way & Purchon, 1981; Janaki Ram & Radhakrishna, 1984; Springsteen & Leobrera, 1986; Houbrick, 1991; Swennen et al., 2001; Sri-aroon et al., 2005, 2006; Tan & Woo, 2010; Yap et al., 2010; Strong, 2011). Its smooth, slender, high-spired, black shell is very similar to some thiarid genera such as Melanoides and Stenomelania. "
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    ABSTRACT: Marine gastropods, Faunus ater (Linnaeus), were collected from Pantai Sri Tujoh (Kelantan), Pantai Bisikan Bayu (Kelantan), Kg. Telaga Nenas (Perak) and Kesang Laut (Johor). Soft tissues of gastropods were dissected into digestive caecum (DC), foot, remainder, muscle, and operculum. The shell and dissected parts were analyzed for Cd, Cu, Ni, and Pb. It was found that the DC and the remainder accumulated high concentrations of Cu ranging between 159.1 and 290.2 μg/g dw. The shell was shown to highly accumulate non-essential Pb, Ni, and Cd compared to the soft tissues. Meanwhile, higher bioavailabilities of Cd and Cu were found in Pantai Sri Tujoh, whereas higher bioavailabilities of Ni and Pb were found in Pantai Bisikan Bayu compared to other sampling sites. The present results suggested that F. ater could be used as a potential biomonitor of heavy metal contamination. However, further studies are still needed in order to validate the use of F. ater as a good biomonitor of heavy metal pollution.
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