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Aquatics Macroinvertebrate Diversity and Bio-Assessment of the Quality of the Middle Wadi Oum Er-Rbia (Morocco)

Ilham Saad, Amal Abou Elghayt, El Mahdi Hbaiz, El Hassania Saad, Sanae Rezouki, Allal Douira, Mohamed Fadli

Ecological Engineering & Environmental Technology

2022

Vol. 23, iss. 6

53--60

The Oum Er Rbia river in Morocco is particularly threatened by lack of appropriate management. It is in this context, this study of the biological diversity of benthic macroinvertebrates in the middle zone of Oum Er Rbia river and the evaluation of the biological quality of water at this level, during a campaign carried out in April 2018. The results show that the stations upstream of the two sources of agricultural and industrial pollution represented by the stations (S1, S3, S4, S5 and S6), the biodiversity is important and the water is of good quality. So that the discharge of wastewater from the city of Kasba Tadla (S2) and Dar Ouled Zaidouh correspond to the station S7 has caused a reduction in diversity and a degradation of water quality of Oum Er Rbia river. We also noted a significant improvement in water quality away from Dar Ouled Zaidouh by 5 km from sources of pollution, which demonstrates the purifying power of the water of the Oum Er Rbia river.

The Impact of Physicochemical Parameters and Heavy Metals on the Biodiversity of Benthic Macrofauna in the Inaouene Wadi (Taza, North East Morocco)

Sanae Rezouki, Aimad Allali, Karim Berady, Jamaa Habchaoui, Noureddine Eloutassi, Mohamed Fadli

Journal of Ecological Engineering

2021

Vol. 22, nr 7

231--241

The present study aimed to study the diversity and density of the benthic fauna along the Inaouene wadi in relation to the variation of physicochemical parameters and heavy metals at six sampling stations representing the major part of the studied watercourses. The samples were taken during March and April 2019. The fauna recorded in this work consists of 2029 individuals corresponding to 39 families and 10 orders. The benthic population size showed that Oligochaetes, Diptera, Heteroptera, Trichoptera and Ephemeroptera are dominant. The diversity indices of Shannon and Weaver, and Piélou show that station S6 favors a better development of macroinvertebrates. This is confirmed by the values of physicochemical parameters and studied noble metals lord which shows that the stations S1, S3, S4 have poor water quality, compared to S6 and S5, the waters of which are of good quality, reflecting the self-purifying action of the watercourses between Wadi Amlil and Idriss I dam.