SILPAKORN UNIVERSITY JOURNAL OF SOCIAL SCIENCES, HUMANITIES, AND ARTS, Vol. 3 (Number 1-2) 2003

Preliminary Report on Freshwater Snails in Toa Dum Forest, Saiyok District, Kanchanaburi Province

Duangduen Krailas, et. al




Abstract


The freshwater snails in Toa Dum Forest, Saiyok National Park,
Kanchanaburi Province, were investigated. Limestone mountains
are the main characteristics of the area which is covered with lush
forests and numerous streams. The investigation was done by
opportunistic collection from upstream to downstream. The snails
were collected using hand-picking and scoop methods. In addition,
the physico-chemical characteristics of water were determined.
Water temperature ranged from 20 to 22oC, and the dissolved
oxygen ranged from 7.9 to 8.9 mg/L. The values of physico- chemical
parameters were approximately the same for all stations except for
the third one. At the third station, the conductivity value was as high
as 250 μmhos/cm while the other station was only 20 to 80 μmhos/
cm.

Only one species of snail was found in the stream of Toa Dum
Forest. This snail was classified into the Family Pleuroceridae,
Genus Paludomus. The typical shell characteristic is oval in shape.
The length of the axis and diameter of the body whorl are 7.3 mm
and 5.7 mm, respectively. The radula is the Taenioglossan form,
and the dentition formula is 2:1:1:1:2. Examination for parasitic
infection in 317 snail samples revealed a trematode infection rate of
2.52%.

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