The number of ant species in each subfamily found at each study site, and the number of ant species collected by HC and LL methods, are shown in Table 2. Using the combination of the two methods, the number of ant species collected in each of the upstream sites (Ton Boon, Ton Klang, Ton Lung) was higher than in each of the downstream sites (Klong Waad, Leam Po).
The study sites and sampling methods could be grouped according to the species of ants found. We included in our analysis 124 species that occurred at higher frequency (see Methods). Of these 68 species were found only in the upstream sites (Ton Boon, Ton Klang and Ton Lung), 32 only the downstream sites (Klong Waad and Leam Po), and 24 at both. Species richness was higher at the upstream sites, with 117 species at Ton Boon,