ความสัมพันธ์ระหว่างสัตว์หน้าดินขนาดใหญ่กับลักษณะเฉพาะของตะกอนดินในป่าชายเลนคลองด่านและอ่าวทุ่งโปรง / ขนิษฐา แย้มวงษ์ = Relationships between macrobenthic fauna and sediment characteristics in Klongdan and Ao Thungprong mangrove forests
Influence of sediment characteristics on macrobenthic fauna community structure in Klongdan mangrove (KD), Samutprakan province, and Ao Thungprong mangrove (TP), Chonburi province, were investigated during the summer (April) and the rainy (August) seasons of year 2008. In each site, samples were collected from 6 stations. The results revealed that KD sediments had silt and clay as main components while TP sediments had sand as the main component. Diversity and density of benthic community at TP were higher than that of KD. Major macrobenthic groups found at KD and TP were bivalves, gastropods, crustaceans and polychaetes. At KD, a total of 16 species/taxa were collected. The dominant species were polychaete, Nereididae and gastropod, Assiminea brevicula (Pfeiffer, 1854). In KD, Nereididae had the highest density while the bivalve, Tellina sp. had the highest biomass. This study revealed that organic matter was the major factor influencing the density of benthic community in KD. On the other hand, TP had more benthic species than KD. Among a total of 33 species recorded at TP, Gafrarium tumidum Roding, 1798, Cerithidea cingulata (Gmelin, 1791) and Maldanidae were the dominant groups. C. cingulata had the highest density, and G. tumidum had the highest biomass. The major factors influencing the density of benthic community at TP were silt and organic matter. In addition, the stations that had high density and biomass of benthic organisms were close to the ocean and parallel to the coast.