THE STATUS OF WATER QUALITY AND CORRELATION WITH ROTIFERS COMMUNITY STRUCTURE IN PHU NINH LAKE, QUANG NAM PROVINCE
Corresponding Author(s) : Trinh Dang Mau
UED Journal of Social Sciences, Humanities and Education,
Vol. 8 No. 4 (2018): UED JOURNAL OF SOCIAL SCIENCES, HUMANITIES AND EDUCATION
The study was conducted at Phu Ninh reservoir, Quang Nam province in order to investigate the current status of water quality and provide more information about biological resources in the study area. A total of 15 positions in the lake were surveyed in 2 seasons. Eight water quality parameters, including temperature, pH, DO, BOD5, TSS, TN, TP, and Chl-a were analyzed. The results showed that the water quality of the lake met the requirements of domestic water supply. The physicochemical parameters of water and the trophic index (TRIX) revealed that the lake’s trophic level was in oligotrophic. The study also recorded 61 species of rotifers, belonging to 15 families. The density of rotifer ranged from 1.250-20.160 individual/liter. According to the results of Canonical Correspondance Analysis (CCA), the appearance of species belongs to Lecanidae (L. closteroceca, L. dorysa, L. haliclysta, L. sola) was related to the increase of Chl-a content. Meanwhile, the appearance of other species like L. luna, L. obtuse, L. signifera and Brachionus diversicornis was related to the increase of the content of total suspended solids in the water (TSS). Moreover, the appearance of Polyarthra major và Anuraeopsis navicular was related to the increase of the content of easily biodegradable organic matters in water (BOD5).
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