Biological evaluation of the Bhulaglar River based on the population structure of macrobenthos in Ardabil Province

Yahyavi, Behnaz (2019) Biological evaluation of the Bhulaglar River based on the population structure of macrobenthos in Ardabil Province. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Research Aim: In this study, the health status of the Bulaghlar River in Ardebil province was investigated Research method:After the initial investigations and studies in the area, 4 stations were identified from the upper to the exit point of the stream from the promenade. Quantitative and qualitative biopsies were performed periodically from 4 stations using Sorber sampler. The creatures collected by Sorber were fixed in 4% formalin and transferred to the laboratory of the researcher and isolated, identified and counted. Findings: In the study area, 4 orders and 7 families from the subtropical group were identified: diptera ephemeroptera, trichoptera, amphipoda, and families of Simolidae, Traniidae, Shironomidae, Bethidea, Haptageneidae, Hydropyecidae, Gemarida were identified. The highest percentage of frequency of dominant macrobenthic species during the sampling was related to the genus Gramarus genus. The highest and lowest abundance without significant difference was obtained in summer and autumn, with an average of 34.62 and 17.8% respectively. Maximum live mass of macrobenthos in summer was 134.1 g / m2 and at least in the spring was 20.55 g / m2. Also, a number of physical and chemical factors such as pH, water soluble oxygen, water temperature, were also measured in this study. The BMWP and Hilsenhov index were also calculated. The richness of EPT and EPT was determined. Conclusion:Most of the physics and chemical parameters showed a significant difference between upstream and downstream stations. And the evaluation of indicators showed low water quality at the downstream stations

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