Distribution and abundance of meiofauna in the sandy beaches of Nakorn Si Thammarat and Songkhla provinces
1996
Sasiwan Tochua | Jiraporn Rujirayanyong | Saowapa Angsupanich (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Natural Resources. Dept. of Aquatic Science)
Sandy meiofauna in Hua Sai, Ranot, Sathing Phra and Singha Nakorn were investigated at two periods during the Southwest monsoon (August 1995) and the Northeast monsoon (January 1996). Eighteen taxa of meiofauna were found: Sarcomastigophora, Ciliophora, Nematoda, Turbellaria, Gnathostomulida, Nemertina, Polychaeta, Tardigrada, Copepoda, Gastrotricha, Insecta, Oligochaeta, Kinorhyncha, Priapulida, Halacaroidea, Rotifera, copepod nauplius and eggs of unknown origin. The meiofauna was 1-11 times more abundant in August than in January. Nematoda was the most abundant at all study areas. The greatest number was found at Ranot beach. The range was from 871-3,643 ind/10 square cm/10 cm depth. The diversity of meiofauna was also more extensive in August (11-17 taxa) than in January (8-14 taxa). Most meiofauna showed vertical distribution which decreased with depth. For the horizontal distribution, the meiofauna densities at the intertidal zone 2 m and 3 m from the high tide level were slightly different. Tidal level was a factor controlling the distribution of meiofauna in beaches. Addition, the organic content in sediment was slightly higher in August (0.48-0.66 percent) than in January (0.48-0.54 percent). Most grain sizes were fine sand and medium and in all study areas.
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