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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: 0.55). 02/2005; 36 Suppl 4:180-8.
Source: PubMed

ABSTRACT 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: Since October 2006, the specific scientific mollusc collection deposited in the Zoobotanical Museum "Augusto Ruschi" - MUZAR (CMOUPF), located at "Passo Fundo" Municipal District, Rio Grande do Sul State/ RS, is developed, counting until July 2011 with a total of 68 species, 36 of which are freshwater forms (20 Gastropoda & 16 Bivalvia), distributed in 11 families and 19 genera, and 30 terrestrial gastropod forms distributed in 13 families and 22 genera; and even two marine/ eurihaline forms (11 Gastropoda & Bivalvia) in their turn divided into two families and two genera. The specimens are cataloged with emphasis in Municipalities of Santa Catarina/ SC and Rio Grande do Sul/ RS, as well as other six brazilian States and samples of the neighboring country of Uruguay ...
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    ABSTRACT: Background The aim of the research was to study the gastropod assemblage associated with a planted mangrove consisting of Rhizophora apiculata in Dam Bay (Tre Island, Nha Trang Bay, central Vietnam). Long-term changes in species composition, density, and biomass of gastropod assemblages in a planted mangrove were compared to those associated with natural mangroves. Results The gastropod assemblages in one planted and two natural mangrove associations were studied. Long-term monitoring (2005 to 2013) of assemblages associated with planted mangroves was also carried out. In total, 53 gastropod species in 21 families were recorded. This is comparable or even higher than in other areas of South-East Asia. In planted mangroves, R. apiculata trees were planted in mid (in 2004) and lower (2007) intertidal zones. Composition of gastropod fauna during the early period of observations (2005 to 2006) differed significantly in species richness, biomass, and abundance from the later period (2008 to 2013). Initially, the values of these parameters were low in the upper, and mid-intertidal zones and negligible in low intertidal zone. In 2008 to 2013, the values increased in the upper and mid-intertidal zones. R. apiculata planting in mid-intertidal zone and changes in its gastropod assemblage strongly affected those of upper intertidal zone as well. Comparison of gastropod fauna in planted mangroves and natural associations revealed significant differences. In planted mangroves, gastropods were mostly represented by eurybiotic species, also found in other not mangrove intertidal habitats, while in natural association many species were predominantly mangrove inhabitants, e.g., Potamididae, Littorinidae, and Ellobiidae. The fact that mangrove plantations in Dam Bay are highly dominated by opportunistic species, together with a paucity of predominantly mangrove-associated gastropods, suggest that the whole ecosystem is not balanced yet. Conclusions The gastropod assemblage found in a 9-year old mangrove plantation differed from natural mangrove associations in that the former is dominated by opportunistic eurybiotic gastropod species. This could mean that the ecosystem of planted mangroves is unbalanced and is still in a transitional state.
    Zoological studies 12/2015; 54(1). DOI:10.1186/s40555-015-0120-0 · 1.01 Impact Factor

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