BIOCHEMICAL FEATURES OF SOME INSECTS SPECIES POTENTIAL PREYS OF PREDATORS

Mower- net is the technical sampling used on the ground relating to study arthropoda in experimental plots, and in gardens of Agronomic National School El Harrach. Insects category dominates with 1.120 individuals (97.1%) and 55% species (94.7%).Orthoptera are highly mentioned with a number of 856 individuals (74.2%). Gastropoda, Crustacea and Myriapoda, together correspond hardly to 2.9% according to total of captured individuals. Three techniques of biochemical analyses are used in laboratory with the aim to determine nutritive values and so energetic contribution of some insects species considered as potential preys of different predators. Used methods in the present work are the Kjeldhal method for dose ot total nitrogen, Soxhlet method for total lipids and Bertrand method relating to sugars. This analysis shows that proteins rates found in different species vary between 3.5 and 28.4%. For sugars rates found, the weaker is 3.4% while the stronger is 25.5%. For lipids, the recorded contents are about 9.8 and 33.3%. The total energetic contribution brought by the three biochemical components which are, proteins,lipids,and total sugars is estimated at 4.56 Kcal by female of Aiolopus thalassinus until 13.77 Kcal by male of Aiolopus strepens.