Diversity of Larvae of Mayflies, Stoneflies and Caddisflies (Order Ephemeroptera, Plecoptera and Trichoptera) in Sritaksin and Bale Waterfalls, Hala-Bala Wildlife Sanctuary, Narathiwat Province
Keywords:EPT larvae, headwater stream, protected area
The objective of this research was to study diversity of Mayflies, Stoneflies and Caddisflies (EPT group) in Sritaksin and Bale Waterfalls, Hala-Bala Wildlife Sanctuary, Narathiwat Province. Field samplings were collected during June to September 2019 and February to June 2020. Samples were collected using a D-frame net and hand picking. Some physico-chemical parameters of water quality were also measured using water quality equipments. Six thousand, eight hundred and twenty-seven larvae were found. Twenty-four families and forty-three genera were identified. Trichoptera was the most diverse taxa included 29 genera 17 families (67.44%) follow by Ephemeroptera 8 genera 4 families (18.60%) and Plecoptera 6 genera 3 families (13.96%), respectively. Diversity of EPT was found in Bale Waterfall more than Sritaksin waterfall (38 and 36 genera), respectively. Results of this study also showed that Hydropsychidae (caddisflies) was the most diverse taxa included 7 genera which Hydropsyche was the most abundant with 1,666 individuals. Hydropsyche and Chimarra were common and widespread taxa, found all sites and every month studied. On the contrary, Hydroptila (Hydroptilidae) was found narrowly distributed, found only in Bale Waterfall. Physico-chemical parameters of water quality were found dissolved oxygen, total dissolved solid, electrical conductivity, water temperature, pH and stream width significant difference between sampling sites (p<0.05). The cluster analysis could categorize the sampling sites into 4 groups and the results of canonical correspondence analysis (CCA) showed that the physico-chemical parameters were correlated with the distribution of EPT larvae.
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