Impact toxicologique du lessivage des feuilles et des aiguilles mortes sur la qualité biologique du milieu aquatique récepteur.

Based on laboratory studies under controlled conditions, we have appraised the toxicological impact of dead leaf leachate from four angiosperm species: Populus nigra, Salix babylonica, Acer monspessulanum and Platanus acerifolia, as well as dead needles of a gymnosperm species, Taxus baccata, on the quality of water of Vittel spring (Tizguit, Ifrane region). The results show that at 25° C the toxicity changes with the duration of leaching, the initial concentration, type of treatment of leaves and dead needles and leaf species. Lethal toxicity tests conducted on Artemia salina larvae and fry of Gambusia affinis show that the If and Saule are the most toxic of water ventilated. [ABSTRACT FROM AUTHOR]