In this study, we observed and investigated the diversity of arthropod communities and environmental factors in Yao Noi and Yao Yai, Phang Nga Province during 3-11 April 2021. A total of 25 species of arthropods consisting of 24 families and 11 orders were found on Koh Yao Noi, and 45 species of arthropods comprising 31 families and 13 orders were found on Koh Yao Yai. In addition, we also found Heteroneda reticulata, Phlogiellus moniqueverdezae and Misumenops nepenthicola, which are species only found in Southern Thailand.
        Our results showed differences in the insect ecosystem functions at Koh Yao Yai, compared with Koh Yao Noi .Koh Yao Yai consists mainly of insect pests related to land broadly being used for agriculture. Microplastic analysis in water and sludge shows more microplastics in water and sediment in Koh Yao Noi than in Koh Yao Yai. As a high number of human populations on Koh Yao Noi, most microplastics were fiber shape that originates from fishing nets, nets, ropes, or fabric fibers from the breakage of synthetic fabrics.
        Though, the present study was conducted as a preliminary step. The data on arthropods and physical environments indicated that Koh Yao Noi and Koh Yao Yai have a great diversity of arthropod species and thus are worthy of conservation