Diversity of Harpacticoid Copepods (Crustacea: Maxillopoda: Copepoda) from Prasae Beach in Rayong Province
Keywords:
Harpacticoida, Copepods, Meiofauna, Intertidal sandy beachesAbstract
Harpacticoid copepods is a small benthic meiofauna, with a body length between 0.1 and 2.5 mm. They distributed in almost all aquatic habitats including freshwater, brackish-water and seawater, especially in intertidal zones, mangroves, seagrass beds and algal mats. They can be found in all sediment types from mud to sand, and at all depths from the intertidal zone to deepest oceanic zone. In addition, harpacticoid copepod density changes with sediment type and with depth. This research aims to examine the diversity of harpacticoid copepods. Sand samples were collected from Prasae Beach, Rayong Province in July 2020 during low-tide with a plastic hand corer. The samples were fixed in a solution of 10% formalin and rose bengal-sea water mixture for 24 hours, kept in the laboratory room for sorting, dissecting and identification. Environmental factors; temperature, salinity, pH and dissolve oxygen were measured. The sand samples were subsequently sieved through 63 µm sieve and the identified under a stereo-microscope by using morphological characters. In terms of diversity; 7 families, 7 genera and 7 species were found. The species that was found in each family are as the followings: Family Ameiridae – Nitokra sp., Family Canuellidae – Scottolana sp., Family Ectinosomatidae – Ectinosoma sp., Family Harpacticidae – Tigriopus sp., Family Longipediidae – Longipedia sp., Family Miraciidae – Shizopera sp. and Family Tachidiidae – Neotachidius sp., a total number of harpacticoid copepods in Prasae Beach were found 1,152 ind/10 cm2 and the family Harpacticidae was the most abundance which is total 486 ind/10 cm2. The family Harpacticidae having behavior as a predator, very fast movement and high mobility may cause them well-adjust to living and survival in the study area
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