Document Type : Original Article
Authors
1
Department of Agricultural Technology, Faculty of Science, Ramkhamhaeng University, Bangkok, Thailand
2
Inland Aquaculture Research and Development for Technology and Innovation Group, Inland Aquaculture Research and Development Division, Department of Fisheries, Bangkok, Thailand
Abstract
This article aimed to study the species compositions, distribution of phytoplankton, and water quality in the headwater streams of Phetchabun Province. The samplings were collected from 4 stations during the rainy season (September 2022), the winter season (December 2022), and the summer season (March 2023). A total of 35 phytoplankton species were found, with diatoms being the dominant group in both species and quantity across all 3 seasons. In the rainy season, the average phytoplankton density was 226,595 units/m3, with the highest density at ST1, Upper Huai Nam Jang. The dominant species found included Phacus quinquemarginatus and Melosira varians. In the winter season, the average phytoplankton density was 5,537,563 units/m3, with the highest density at ST1, Upper Huai Nam Jang. The dominant species found included Surirella robusta. In the summer season, the average phytoplankton density was 1,874,367 units/m3, with the highest density at ST4, Huai Ban Tok. The dominant species found included Eunotia pectinalis and Surirella robusta. The phytoplankton found at all stations throughout the study included Oscillatoria sp., Synedra ulna and Gyrosigma sp. The values of the diversity index, evenness index, and richness index ranged from 0.99 to 2.14, 0.39 to 0.98, and 0.45 to 0.96, respectively. The concentrations of ammonia-nitrogen, nitrate-nitrogen, and orthophosphate-phosphorus in the water ranged from 0.4 to 0.6mg/ L, 0.02 to1.70mg/ L, and 0.16 to 0.83mg/ L, respectively. The study results can be used as data for assessing and monitoring water quality, as well as evaluating primary productivity and aquatic animal yield in headwater streams, which serve as indicators of the ecological richness in headwater streams of Phetchabun Province.
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