Physicochemical and biological status of Aghlagan river, Iran: effects of seasonal changes and point source pollution

Ecological indicators for qualitative assessment of Ojarud River: A case study

“…The results of this study showed that the diversity indices of Shannon‐Wiener and Simpson indicated a decreasing trend in S3 in most seasons. On the contrary, the Dominance index showed an increasing trend in S3, which is in line with the results of Asadi Sharif et al ( 2020 ). The major cause of the reduction in the rate of the diversity indices in S3 could have resulted from the point source pollution.…”

“…Today, biotic indices are used in many countries such as the UK (Medupin, 2019 ), China (Dou et al, 2022 ; Wu et al, 2020 ), Nigeria (Arimoro & Keke, 2017 ), France (Carayon et al, 2020 ), and Iran (Asadi Sharif et al, 2020 ) to assess the water quality. In particular, the assessment of the point and non‐point source pollution and its simultaneous impact on the water body, sediment, and ultimately the biota is rarely done.…”

“…Literature is fraught with studies on the effect of point source pollution on water quality status (Asadi Sharif et al, 2020 ; Malvandi et al, 2021 ). In the study of Asadi‐Sharif and Imanpur (Asadisharif & Imanpure, 2020 ), the effect of the point source pollution was assessed on the quality of the Disam River.…”

“…The initial studies on applying biological indicators were carried out in Europe and the United States (Persoone & De Pauw, 1979). However, monitoring of river health via biological indicators becomes more prevalent in recent years in developing countries such as Iran (Aazami et al, 2015;Asadi Sharif et al, 2020;Shokri et al, 2014).…”

“…The initial studies on applying biological indicators were carried out in Europe and the United States (Persoone & De Pauw, 1979 ). However, monitoring of river health via biological indicators becomes more prevalent in recent years in developing countries such as Iran (Aazami et al, 2015 ; Asadi Sharif et al, 2020 ; Shokri et al, 2014 ). The health condition of the river is usually assessed via three categories of organisms: Benthic diatoms (i.e., phytobenthos) to detect eutrophication and acidification status (Eveleens Maarse et al, 2020 ; Masouras et al, 2021 ).…”