Diversity of stoneflies, dragonflies, damselflies and blackflies at Thong Pha Phum forest
2002
Chanpaisaeng, J.(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Entomology)
This study of the diversity and distribution of stoneflies, dragonflies, damselflies and black flies from lotic habitats at Thong Pha Phoom forest was conducted in 3 disturbed areas, Pong Pu Ron, Ban Lam Pilok and Ban Prajammai, and 2 undisturbed areas, Ban Patsaduklang and MaeNamNoi. We collected samples on 21 and 22 March, 27 and 28 April, and 25 and 26 May 2002 and found 6 species of stoneflies, 39 species of dragonflies and damselflies and 14 species of black flies. Higher number of stonefly nymph species and individuals were found in undisturbed areas (6 species and 245 individuals, respectively than) in disturbed areas (5 species and 98 individuals, respectively) Dragonfly and damselfly adults found in disturbed areas, comprised 11 families, 29 genera, 34 species and 165 individuals, whereas in undisturbed areas they comprised 9 families, 20 genera, 21 species and 102 individuals. There were significant differences between areas. In total, 10 black fly species and 1,363 individuals were collected from disturbed areas and 11 species and 301 individuals from undisturbed areas. Pupae of black flies were reared to adults for identification to species level. Abundance of black fly larvae in disturbed areas was higher than in undisturbed areas. Factors that influence the distribution and density of black flies include the quality of food, substrates, current velocity, water depth and water temperature. However, these results were based on sampling conducted only 3 times. As the study continues, it is expected that more species of the target insects will be found.
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