Inventory of Invertebrates on Pear Crop (‘Pyrus communis’) in Makouda area (Tizi-Ouzou), Algeria

Abstract

The inventory of invertebrates on pear cultivation using 2 methods of sampling,Barber traps and colored traps in Makouda region (Tizi-Ouzou) Algeria, allowed usto collect 77 species divided into 59 families, belonging to 18 orders and 5 classes.The values of the centesimal frequencies applied to invertebrates orders identified inthe studied plot vary from one type of trapping to another, each sampling methodrelates to a representative order group. The diets of insects are extremely diverse,due to the structures and function of the mouth parts, the structural and functionaldivision of the digestive tract. We have established a distribution according to thedifferent trophic categories according to our personal observations and thebibliography consulted. We were able to distinguish 8 large groups among the 77insect species selected. Shannon-Weaver diversity index values are quite high in thestudy plot, it is H ’= 4.80 bits for Barber traps, H’ = 4.59 bits for colored traps, H’= 4.83 bits for sweep net and H’ = 2.64 bits for butterfly net. The fairness obtainedfor each type of trap varies from E = 0.87 to E = 0.94, these values tend towards 1,which reflects a balance between the species in the environment