COMPOSITION AND DIVERSITY OF ARTHROPODA IN BRASS ISLAND, SOUTHERN NIGERIAJOHNNY ROTIMI AND MICHAEL UWAGBAE
A preliminary baseline study of Brass Island, one of the main coastal barrier islands of Nigeria, was carried out to determine the terrestrial arthropod species composition and diversity between January and December 2009. Arthropods were sampled using general purpose insect net, sweep net and pitfalls traps. Captured specimens were identified and classified by trophic groups. Sampling results showed that there were altogether 56 species of arthropods grouped into 35 families and 15 orders. The abundance of the arthropods was in the following order: Diptera > Lepidoptera > Hemiptera > Orthoptera > Coleoptera > Isoptera > Hymenoptera > Odonata > Dictyoptera > Mecoptera > Neuroptera > Araneae > Diplopoda > Chilopoda > Heteroptera. Diversity indices calculated showed a generally diverse community of arthropods with Margalefs index (d) = 6.35, Shannon index (H1) = 3.91 and Evenness (E) = 0.97. The information of the composition and diversity of arthropods in this study could play important role in ecosystem monitoring, assessment and management of this coastal Island.
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