ความหลากชนิดของโคพีพอดน้ำจืด (คาลานอยด์ ไซโคลพอยด์ และฮาร์แพคทิคอยด์) ในทะเลน้อย จังหวัดพัทลุง

Abstract

Species diversity of copepods (calanoid, cyclopoid and harpacticoid) in Thale Noi, Phatthalung Province was investigated. Qualitative samples were collected using 60 μm mesh of plankton net every 2 months from February 2013 to February 2014. Ten parameters including temperature, salinity, conductivity, depth, transparency, pH, dissolved oxygen, chlorophyll a, total suspended solids, and hardness were measured. A total of twenty genera from twenty-eight species were recorded. They comprise six species of calanoid, thirteen species of cyclopoid, and nine species of harpacticoid. One species, Parategastes pholpunthini Saetang & Maiphae, 2015, is a new species. Six species including Mesocyclops papuensis Van de Velde, 1987, Mesochra sp.1, Mesochra sp.2, Onychocamptus vitiospinulosa Shen and Tai, 1963, Phyllognathopus paludosus (Mrazek, 1893), Schizopera sp. and Unidentified, are the first record of Thailand. In addition, the result showed the highest diversity in station 10 (18 species) and the lowest diversity in station 6 (6 species). Moreover, the result showed the highest diversity in October, 2013 (26 species) and the lowest diversity in December, 2013 (5 species). The complementarity value of copepods was high difference in October, 2013 and December, 2013 (80.77%), and low difference in August, 2013 and October, 2013 (23.08% ). Furthermore, the result showed high difference in station 7 and 11 (80%), and low difference in station 2 and 12, station 5 and 10 (33.33%). To assess actual species richness, Chao1 was examined as the least bias nonparametric estimator for present result. The total species richness recorded was not far from S*max Chao1 (30.5 species). The species richness of copepods has been shown to be related to pH and hardness.