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Species Diversity and Spatial Distribution of Macroinvertebrates on the Intertidal Zone of Rajamangala Beach, Trang Province, Thailand

Khwanta Tantikamton, Jantima Rodpai, Prasit Srinakorn, Suwit Jitpukdee

Abstract


The study on species diversity and spatial distribution of macroinvertebrates on the intertidal zone of Rajamangala beach, Trang province, Thailand aims to investigate species, numbers and spatial distribution changes of polychaetes, mollusks and crabs along the 2 km beach. Four sampling stations from an adjacent of the estuary to the end at the beach, which is nearby a hill, were examined. Each station was divided into four lines: highest tide, 100 m, 200 m and 300 m in distance from the high tide line. Quadrate sampling method was applied for sample collection in monsoon and dry seasons with three replicates in a season. The results showed that 23 polychaete, 23 mollusk and 19 crab species were found. The highest polychaete diversity was recorded at the lowest tide line. At 200 m and 300 m from the highest tide line had highest mollusk species diversity whereas at 100 m from the highest tide line had highest crab species. Lumbrineris punctata McIntosh 1885 and Scoloplos spp. were dominated polychaete species of the 200 m and 300 m whereas Glycera spp. were frequently found at the 100 m from the highest tide line. For mollusk species, high densities of Nassarius spp., Pilucina sp. and Donax incarnatus Gmelin 1791 were found. Crab species of the beach were in Infraorder Brachyura (15 species) and Anomura (four species). The most abundant species was Dotilla myctiroides Milne-Edwards 1852 followed by Scopimera proxima Kemp 1919. The species diversity of all sampling stations had similar distribution, but from the highest tide line to the lowest tide line had a different pattern of macroinvertebrate species distribution.

Keywords


Species diversity; Spatial distribution; Beach; Macroinvertebrates

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