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Water quality of Sirvan River (Kurdistan) based on zooplankton biological indices
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Rahimeh Rahmati   , Mehdi Naderi Jelodar , Mastooreh Doustdar |
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Abstract: (520 Views) |
Zooplanktons have high potential as biomarkers and are a good indicator for environmental changes caused by impactful activities. The present study aims to determine the water quality of the Sirvan River in Kurdistan, at the head of the Gaveh River and Qeshlaq River branches, by examining the diversity and density of zooplanktons and using Shannon and Saprobic zooplankton biological indices for one year. 5 stations (4 stations from the upstream of the Qeshlaq River to near the reservoir of the Javeh Dam and one station in the branch of Gaveh River) were carried out in 2020-2021. Sampling of zooplankton was done using a water filter with a 50 micrometer planktonic net, and the samples were observed under a microscope after being fixed with formalin and prepared. 17 zooplankton species of Protozoa, Rotifera, Cladocera and Copepoda were identified in different stations during sampling. Zooplankton density in stations 2 and 3 showed different conditions compared to other stations. In stations 3 (2.97) and 1 (2.18), respectively, the highest and lowest average of Saprobi index were calculated, and the highest and lowest average of Shannon index were also in station 5 (1.56) and station 3 (1.04) was obtained. Stations 2 and 3 showed different conditions in zooplankton density than other stations, also the highest values of saprobic index (organic pollution) were calculated in these two stations. In this study, the population of zooplankton in winter was different from other seasons (especially summer) and the lack of significant difference in Shannon's diversity index between stations throughout the year indicates the stability of organic pollution along the river. In general, the state of organic contamination of the sampling stations on saprobic index was in alpha and beta mesosaprobe conditions (moderate-severe pollution). |
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| Keywords: Zooplankton, Biological indices, Water quality, Sirvan River, Javah Dam. |
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Type of Study: Research |
Subject:
Fisheries
Received: 2024/01/11 | Accepted: 2023/04/22 | Published: 2023/04/22
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