Etude hydrobiologique d'un cours d'eau du Moyen-Atlas : l'oued Tizguit (Maroc)

Abstract

The aim of this study is to gain a better understanding of the water quality and the benthic macrofauna of Moroccan rivers from the Moyen-Atlas. The Tizguit wadi was chosen for its accessibility and its environmental variability. Eight physical and chemical factors were measured and the fauna inventory was made at 11 sites during an hydrological cycle. The results showed that changes occurred along an upstream-downstream gradient. The number of sampled taxa was 167 belonging to different groups, where Coleóptera were dominant. The distribution of this fauna depends mainly on the environmental factors, and the originality of its composition depends on the water quality.

Évaluation de la pollution physico-chimique des eaux de l’Oued Khoumane (Moulay Idriss Zerhoun, Maroc)

“…Les résultats obtenus nous permettent de conclure que les eaux de l'Oued sont fortement minéralisées. Cette minéralisation dépasse largement celle montrée dans les Oueds Tizguit (Touabay et al, 2002), Boufekrane (Lamrani et al, 2011) et Ouislane (Aboulkacem, 2007. Comme ce paramètre est déterminé par la teneur en substances dissoutes, la charge ionique, la capacité d'ionisation, la mobilité et la température de l'eau (Derwich, 2010), les variations saisonnières observées pourraient s'expliquer aussi par le phénomène de dilution que connaît l'Oued suite aux précipitations en période hivernale (Nassali et al, 2005), contrairement à la période sèche (été et automne), où a lieu une élévation de ce paramètre accentuée par la forte évaporation (El Morhit et al, 2008) (karrouch, 2010).…”

The genus Mercuria Boeters, 1971 in Morocco: first molecular phylogeny of the genus and description of two new species (Caenogastropoda, Truncatelloidea, Hydrobiidae)

“…Over the years, M. similis (=M. confusa) has been reported from several springs and streams in central and western Morocco (Ghamizi et al 1997, Berrahou et al 2001, Touabay et al 2002, Boulal et al 2017, Taybi et al 2017. However, these records require confirmation through additional anatomical descriptions and molecular data.…”

Impact of wastewater from the rural commune of Jmaa Moulblad on the physico-chemical quality of the waters of the Grou River (Rabat region, Morocco)

“…This made it possible to classify the water quality of this zone as good to medium. This mineralization is much lower than that shown in some Moroccan rivers such as, the Khuan River [14], the Tizguit River [15] and the Boufekrane River [16].…”