Polychaetes in Mangrove Forest at Kung Krabaen Bay, Chanthaburi Province

The diversity, density and biomass of polychaetes in Kung Krabaen Bay mangrove forest, Chanthaburi Province were carried out. Two collections of samples, dry and wet season, with 4 main stations were set up along this mangrove areas. The results showed that 9 families with 14 genera were identified as Family Capitellidae, Lumbrineridae, Nereidae, Opheliidae, Orbiniidae, Pilargidae, Sabellidae, Spionidae and Syllidae with dominated by Capitellidae. The density of polychaetes during dry and wet seasons were 1-22 ind/m 2 and 1-25 ind/m 2 . The average biomass of dry and wet seasons were 1,093.0±614.8 mg/m 2 and 1,345.4±1,130.4 mg/m 2 . The species diversity index ranged from 1.2-3.2 (dry season) and 1.1-1.9 (wet season), while species richness were 1.2-2.7 (dry season) and 0.6-1.0 (wet season). The evenness index of dry and wet season were in a range of 0.01-0.90 and 0.50-0.92, respectively. The similarity index with cluster analysis of polychaetes at different stations using Bray-Curtis similarity could be separated into 3 main groups at 65%. Keywords : diversity, polychaetes, mangrove forest, Kung Krabaen Bay, Chanthaburi Province