In order to contribute to the myrmecological fauna knowledg of the Guerrouche forest massif based in northeastern Algeria. A study was conducted on three oak groves (Quercus suber, Q. canariensis and Q.afares). A total of 60 plots were surveyed by using four sampling methods (manual capture, bait, pitfall and Winkler). The inventory revealed 34 ants species belonging to 15 genus and 4 sub-families; Dolichoderinae, Formicinae, Myrmicinae and Ponerinae. Dispatch as follow,  22 species for Cork oak, 14 for Algerian oak and 17 for Afares oak. Myrmicinae dominate in Cork oak and in Algerian oak (82.83 and 81.23% respectively) while in the Afares oak, Formicinae are largely in the lead (68.54%). This study revealed an endemic species to Algeria (Aphaenogaster testaceo-pilosa ssp canescens), three endemic’ species to Algeria and Morocco (Camponotus laurenti, Messor antennatus ans Aphaenogaster foreli) and one endemic to Algeria and Tunisia (Bothriomymrmex decapitans). Comparison of the four sampling methods effectiveness, used reveals that it’s the bait (80.7% of the species total number harvested in the all stations) and manual capture (49.69% of the species total number harvested in the all stations), which allowed the capture of the largest number of species followed by pitfalls traps (31.64% of the species total number harvested in the all stations). The Winkler was much less effective (5.55% of the species total number harvested in the all stations).

A study of the adaptation of the ant Cataglyphis bicolor in terms of feeding under insular conditions was conducted on the north-eastern coast of Algeria. For this, three pairs of stations (island-continent) were chosen. Analyzing fragments of prey species found in C. bicolor nests, the diet in each station pair was studied. The results obtained indicate that C. bicolor has an opportunistic diet characterised by insectivory. Indeed, more than 95% of the prey consumed in the six study stations were insects with a clear preference for other ants, with frequencies ranging from 52 to 87%. Among the latter, Messor barbarus, Camponotus sp., Camponotus laurenti, Pheidole pallidula and Tetramorium biskrense were the ants most predated by C. bicolor. The diversity of continental prey seemed greater than that of island environments. For the two Cap Sigli stations, the prey richness was 94 species for the continent against only 28 species for the island environment. For Boulimat, there were 27 prey species for the mainland and 20 prey species for the islet. Finally, for the Sahel region, C. bicolor was able to harvest 42 prey species on the mainland and 28 species on the island. The diversity of C. bicolor prey in the island environments seems to be a function of insect richness (prey availability) and floral richness.

The present work studied the diversity of Formicidae in two agrosystems of Bejaia, a lemon orchard located at INRAA and an orange orchard located at Amizour.  We used the transect method by combining three (3) sampling methods: Barber Pots or Pitfall, Bait, and manual capture. We identified 18 ant species representing 11 genera and three subfamilies: Dolichoderinae (Tapinoma magnum), Formicinae (Cataglyphis, Camponotus, Lasius, and Plagiolepis), and Myrmicinae (Messor, Aphaenogaster, Crematogaster, Pheidole, Tetramorium, and Temnothorax). The species richness was 13 species in the Oued Ghir’s site and 12 species in Amizour’s site. At INRAA, Dolichoderinae and Myrmicinae have the same proportions (43.95 and 43.17%, respectively) followed by Formicinae (12.88%). In Amizour, Formicinae showed the higher frequency (40.28%), followed by Dolichoderinae and Myrmicinae (30.47 and 29.25%, respectively). In the INRAA lemon orchard Tapinoma magnum was the dominant species with a relative abundance of 43.95%, whereas in Amizour the predominance is attributed to the Cataglyphis viatica with a relative abundance of 39.05%.