Résumé: De par leur grande sensibilité aux changements environnementaux, les Coléoptères sont d’excellents indicateurs de la santé des écosystèmes. Dans cette étude, nous avons analysé la diversité et l’abondance du peuplement de Coléoptères dans deux environnements différents pour en déduire la part des espèces saproxyliques. L’étude qui en découle a été réalisée de mars à juin 2022 dans le massif montagneux de l’Édough, où nous avons mené un échantillonnage systématique dans le site naturel de Ain Boukal et le site post-incendié de Ain Barber. Nous avons utilisé deux dispositifs de piégeage qui sont la chasse à vue et les pots Barber le long d’un transect dans chaque site.Au total, 750 spécimens ont été récoltés, identifiés et répartis en 20 espèces appartenant à 10 familles taxonomiques. Le calcul des indices écologiques du peu- plement de Coléoptères révèle la présence exclusive et l’abondance de deux familles saproxyliques (Cerambycidés et Buprestidés) au niveau du milieu post incendié. Enfin, l’analyse de l’organisation trophique des Coléoptères a montré que les saproxyliques constituent le groupe fonctionnel le plus important juste après celui des phytophages, suggérant la mise en place d’un processus de restauration typique dans les milieux post incendiés.

Résumé: The wild boar Sus scrofa Linnaeus, 1758 (Mammalia Suidae) is one of the most prolific and invasive species threatening the balance of natural areas, particularly wetlands. The objective of this work is therefore to assess the impact of this species on the physical quality of soils in the wetlands of El Kala National Park. The study was conducted on the Blue and Black Lakes during and after the hunting season. The activity traces were geolocated and then overlaid on a map using the SasPlanet program. The results obtained show overall a limited activity of the wild boar in the Black Lake. However, there is a significant increase in the rooted area of the Blue Lake, which is particularly marked after the hunting period, but this seems to be the result of the decrease in the water level.

Résumé: We analyzed fluctuations in of small mammals’ biodiversity through the winter diet of the common genet Genetta genetta (Linnaeus, 1958),to deduce the predator - adopted strategy according to the habitat conditions in which it occurs, particularly in anthropogenic environments. The field sampling was conducted during the 2020 winter season, in two contrasting environments of the Edough mountain range: natural site (Ain Boukal), and anthropized site (Bouzizi landfill). The analysis of 30 collected excrements in each of the two sites, allowed us to identify different food categories including small mammals. The result shows that the common genet is an excellent sampler of small mammals by consuming at least four taxonomic genera. The results also show that despite that the genet is a generalist predator with a wide food spectrum, the results show that it had exercised a selectivity on small mammals, preferentially on genera Apodemus which was abundant in the natural habitat. However, in the anthropized habitats, the genet was opportunistic feeding on waste and abundant small mammals, mainly for the genera Rattus.

Résumé: The current study seeks to evaluate the biodiversity and the structure of the onstream macroinvertebrates community assemblage in Edough Mountain in north-eastern Algeria. Data was collected between April and June 2019 along a mountain stream, from its source to its outlet, with analysis of some physico - chemical parameters. After capturing 906 specimens, we were able to identify 08 taxonomic orders and 35 taxonomic families. The results showed that the richest and most abundant families are Dytiscidae (Coleoptera) and Corixidae (Heteroptera).