Abstract
Abstract In order to evaluate the Diptera biodiversity in the Boumerzoug sub-basin, samples were performed at five permanent oueds: El Berda Oued, Boumerzoug Oued, El Guareh Oued, Hmimime Oued, and Sigus Oued. Sampling was carried out monthly during the period from December 2014 to November 2015. The samples were taken using a Surber mesh for the lotic face with size 25 cm * 20 cm * 65 cm, 500 µm net. In total, 53484 individuals comprising 24 families were collected. The Chironomidae family is the most dominant with a population of 43553 individuals (Fc % = 81.43%), followed by the Simuliidae (5137 individuals, Fc % = 9.61%), Psychodidae (1907 individuals, Fc % = 3.57%), Ephydridae (1509 individuals (Fc % = 2.81%) and Sciaridae (313 individuals, Fc % = 0.59%). However the remained families (Culicidae, Asilliidae, Mycetophilidae, Tipulidae, Syrphidae, Tabanidae, Muscidae, Calliphoridae, Ceratopogonidae, Fanniidae, Cecidomyiidae, Anthomyiidae, Sphaeroceidae, Sciomyzidae, Stratiomyidae, and Phoridae) weree poorly represented (between 1 individual (Fc % <0.00%) to 281 individuals (Fc % = 0.53%) were collected with predominance. Finally, compared to the other families, the predominance of the Chironomidae family can be explained by the fact that this family plays an important ecological role in wetlands rich in organic matter, even clearly polluted.
Highlights
Oueds are among the most complex and dynamic ecosystems [1]
For nutrients the results show a strong pollution by mineral nitrogen compounds, especially ammonia, which represents a good tracer of the municipal urban pollution in the wadis of (ghareh, sigus, el hmimine and boumerzoug with values between 0.4 and 2.6 mg/l especially in ghareh (Table 2)
The dominant presence of the Chironomidae family compared to the others describes that this family plays explained that this family plays an important group important role in wetlands unctingf wich as rich in organic matter, even polluted We note the presence of 08 families of Diptera of medical and veterinary interest in this sub-basin, and we note the dominant position of the Simuliidae in this station with 5137 individuals, followed by the Psychodidae with 1907 individuals
Summary
Oueds are among the most complex and dynamic ecosystems [1]. They play essential roles in the conservation of biodiversity, in the functioning of organisms and in the cycle of organic matter. Diptera is characterized by its great diversity both ecologically and biogeographically They are answered from the equator to the polar regions and benefit from a great capacity to colonize the most varied biotopes: springs, oueds, lakes, marshes and sea coast. They are among the best represented aquatic invertebrates in terms of the number of species as well as individuals [4]. It should be noted that few works on Nematocera and Brachycera are undertaken in Algeria. Moubayed et al [24] worked on the Chironomid Diptera in Algeria. Zerguine et al [25] worked on the Chironomid Diptera of North East Algeria. The objectives of this work can be summarized in an inventory of Diptera in the Boumerzoug (Constantine) sub-basin in the northeast of Algeria
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