Contribution to the study of the Orthoptera diversity through the alimentary diet of some waders in Algeria

In order to study orthopteric diversity through the alimentary diet of predatory birds, 444 rejection pellets of one heron Bubulcus ibis and the White Stork Ciconia ciconia made it possible to carry out an estimation study of the orthopteric fauna of three regions in Algeria, Rachgoun Island, Bjaia and Tébessa.After analysis of the rejection pellets, a specific richness of 32 species of Orthoptera was recorded for the three studied regions, including 10 Ensifera and 22 Caelifera.The Acrididae family predominates in all the Orthoptera populations collected.The highest centesimal frequencies were noted for Gryllus bimaculatus (37%) in Béjaia, Pamphagus tunetanus (36.7%) in Tébessa and Pezotettix giornae (34.73%) and Calliptamus barbarus (31.15%) in Rachgoun Island.This is directly linked to the number of orthopterofauna existing in the field.The diversity of the regions surveyed does not differ much, Rachgoun Island (H': 2.22 bits, E: 0.79), Béjaia (H': 3.14 bits, E: 0.71) and Tébessa (H': 2.13 bits, E: 0.52); with evenly distributed stands with close similarity between Béjaia and Rachgoune Island (42.86%) and between Béjaia and Tébessa (42.10%).The results thus obtained by this study are similar to those of other sampling methods; presenting the possibility of being combined with other techniques for estimating the abundance of orthopteric fauna in order to obtain results close to reality; precisely in the environments where Orthoptera are subjected to strong predation pressure by the avifauna, knowing that it is quite precise, complementary and does not present any ecological constraints.