Analysis of Insect Diversity of Three Islets in the North-East of Algeria
During spring and summer (April to July) of 2009, insects of three islets in the North-East of Algeria were sampled by pitfall traps, sweep net and Japanese umbrella. Analysis of insect diversity shows the existence of 144 species in the three islets. Petit Cavallo island is the most rich with 140 species, followed by Grand Cavallo island and Grand Cavallo islet with 92 and 25 species, respectively. Diversified orders were Coleopters on the two main islet (Petit Cavallo island: 42 species, Grand Cavallo Island: 33 species) and Hymenopters on Grand Cavallo islet (10 species). For abundance, Hymenoptera was the most dominant on the three islands (Petit Cavallo: 428 individuals, Grand Cavallo island: 229 individuals, and Grand Cavallo islet: 118 individuals). The main three richer families in Petit Cavallo island were Formicidae (9 species), Pentatomidae (8 species) and Miridae (7 species). In Grand Cavallo island, two families were prosperous: Formicidae (8 species) and Chrysomelidae (6 species). However, Formicidae seemed to be richer in Grand Cavallo islet with 5 species. In terms of abundance, Formicidae was the most dominate in three islands (Grand Cavallo islet: 69.87%, Petit Cِavallo island: 34.95%, Grand Cavallo
isalnd: 25.88%). From the point of view of the similarity, the composition of insect fauna seemed to be close between Petit Cavallo island and Grand Cavallo island (77.58%).
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