SOIL ENTOMOFAUNA IN DIFFERENT PLANTATIONS WITH BRAZILIAN MAHOGANY (SWIETENIA MACROPHYLLA KING) IN EASTERN AMAZONIA

Abstract

In the Brazilian mahogany (Swietenia macrophylla King), few studies report the knowledge of the entomofauna of these ecosystems. Considering the importance of research on entomofauna in forest plantations mainly in reforestation ecosystems with Brazilian mahogany, it is intended to answer the following question: How is the entomological diversity distributed and what is its contribution in the different forest ecosystems with Brazilian mahogany? To answer this question the following hypotheses were elaborated: The edaphic entomofauna is influenced by the floristic composition and the climatic variations in the three ecosystems studied. The orders Hymenoptera, Isoptera and Coleoptera are the most abundant orders in the three ecosystems with Brazilian mahogany. The main groups of insects present in three mahogany reforestation ecosystems were identified. The collections were made in two distinct periods: dry and rainy for two consecutive years. Eighty pitfall/ecosystem traps were installed, which remained for 48 hours in the field. The Mann- Whitney and Kruskal-Wallis test (p <0.05) were used to verify the effect of seasonality and the type of forest ecosystem on the abundance of insect orders. The Dunn post hoc test was used to identify which ecosystems there were significant differences in order abundance. To identify which families are correlated to mahogany ecosystems, the IndVal analysis was used. The analyzes were done in program R version 3.3.1. The edaphic entomofauna associated to reforestation ecosystems with Brazilian mahogany Swietenia macrophylla. has high wealth and abundance of orders and families. Due to the seasonality that favors the rainy season with greater abundance of insects. The order Hymenoptera is richest highlighting the family Formicidae, followed by Isoptera and Coleoptera, these groups of insects predominate over the others in the rainy and dry period. There is specificity of insect families in relation to the forest ecosystem.