Mise en évidence de l’influence de quelques paramètres physico-chimiques sur le développement fongique dans les eaux cotières mostaganémoise

Abstract

This work presents the results of mycological analyzes of the marine waters of the Mostaganemois coast, and the influence of certain physicochemical parameters such as: temperature, pH and chemical oxygen demand (COD) on the proliferation of these fungi. Three sites were chosen for this study: Stidia beach, Salamandre beach and Port of Salamandre. The macroscopic and microscopic appearance of the strains isolated from seawater showed the presence of several fungal species. A total of 329 strains were isolated and divided into ten genera of filamentous fungi and other genera of yeasts which are: Penicillium spp. (28.56%), Aspergillus spp. (11.54%), Rhyzomucor sp. (10,63%), yeasts (10.63%), Fusarium moniliforme (8.51%), Trichothecium sp. (7.90%), Peacilomyces sp. (7.59%), Scopulariopsis brevicaulis (7.59%), Trichoderma. sp. (3.03%), Sphaerosporium sp. (2.12%) and Mucor sp. (1.82%). From the comparison of the count results, it emerges that the surface seawater is more loaded with fungal isolates (180 isolates) than that of the bottom at 15 cm depth (149 isolates). The Salamandre site has the highest number of fungal isolates (175 isolates), followed by the Port of Salamandre (94 isolates) and finally the Stidia site (60 isolates). The study of physicochemical parameters has shown that the distribution of marine microfonge depends on climatic conditions, such as temperature, pH and also organic matter.