Abstract

The distribution of adult Hydropsychidae and physicochemical variables at Mae Tao Creek, Mae Sot District, Tak Province, northern Thailand, were sampled bi-monthly from February to December 2011. Five sampling sites were selected along the creek. Water temperature, dissolved oxygen, turbidity, sulfate, nitrate-nitrogen, and orthophosphate did not vary significantly during the research period, and pH, electrical conductivity, turbidity, and sulfate did not vary significantly among the sampling sites. A total of 1,065 male individuals were caught belonging to 5 genera and 20 species. Cheumatopsyche carmentis Malicky & Chantaramongkol 1997, Cheumatopsyche dhanikari Malicky 1979, Cheumatopsyche globosa Ulmer 1910, Cheumatopsyche lucida Ulmer 1907 and Potamyia flavata Banks 1934 were identified as the most common species of the research area. Pearson’s correlations were used to determine the relationships between water quality variables and the adult caddisfly faunas. Air temperature, turbidity, nitrate-nitrogen, and ammonia-nitrogen were strongly correlated only with the presence of adult caddisflies.