dragonflies, Odonata, diversity, primary and secondary dipterocarp forest, Borneo

We sampled odonates at Sungai Wain Protection Forest, Kalimantan, Indonesia. 25 survey days were divided between two seasons. 88 species were found, which is a relatively high diversity in dragonflies. Seasonal differences in the species diversity were fairly small. The highest species diversity was observed in intact primary forest, with 60% of all recorded species found in this habitat, and 32 % of all species found exclusively here. The proportion of biotope specialists decreased in the gradient of intact primary forest, slightly degraded primary forest, secondary forest, heavily degraded forest and non forest. The ordination obtained from detrended correspondence analysis showed, along the main axis, a gradient in community similarity corresponding to the degree of forest degradation. The evidence indicates that within the applied spatial scale, any forest degradation results in fewer species, with a pronounced change in the species composition, and an overall reduction in taxonomic diversity.