Species Diversity, Abundance and Habitats of Land Snails in a Square Kilometer
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2011-01-24
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Journal of Science and Technology Mahasarakham University - วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยมหาสารคาม
Abstract
Land snails were collected from a square kilometer on Phu No, Kalasin province from thirty-six, 20 x 20 m plots during the rainy season from to 31 August to 6 September 2009. In total, 5, 607 individuals were found, belonging to 15 species. Nine species were found in the highest species diversity plots, which were in a dry evergreen forest in a valley and stream valley or water fall plots. Three species were found in the lowest species diversity plots, which were grass land on a table top plain plot. The highest abundance plot was in a dry dipterocarp forest on a hill slope,which yielded 1.48 individuals/m2. The lowest abundance plots were grass lands on a table top plain, which yielded 0.02 individuals/m2. Species diversity indices (H) ranged from 0.284-1.681 and the dominant species indices (C)ranged from 0.220-0.877. The highest species diversity index was the plot, which showed the lowest dominant species index. It was in the dry evergreen forest plot in the valley. Whereas, the lowest species diversity index and highest dominant species index plot was the grass land plot on the table top plain. The Sorensen’s similarity coefficient (Ss) of land snail species in each forest type ranged from 0.526 to 0.923. The lowest Ss was between the dry evergreen forest and the grass land plots, whereas the highest Ss was Ss between the dry dipterocarp forest and the forest garden. The most abundant species was Cryptozona siamensis; 2,235 individuals (39.86%) were collected.Hemiplecta distincta was found in all plots. Cyclophorus sp., Sarika sp., and Chloritis tenella were found only in a few plots of dry evergreen forest in the valley. Streptaxid was found in two plots of dry evergreen forest in the stream valley and water fall area. Amphidromus (Amphidromus) schomburgki schomburgki was found in abundance in most dry evergreen forest plots in the valley and stream valley and water fall area. This population is the highest abundance among reported population in Thailand and composed of nearly a similar ratio of dextral and sinistral shells.
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Journal of Science and Technology Mahasarakham University - วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยมหาสารคาม; Volume.29 Numer.4 october-december 2010; 359-371