Avaliação da composição e flutuação populacional de coleobrocas em vegetação nativa no Semiárido da Paraíba.

Abstract

Monitoring and population dynamics of insects serve as a basis for the development of integrated pest management programs as well as for obtaining information on faunal indexes and other ecological factors. Coleoptera are among the insects of major importance to the forest sector, due to the various functions they exert and the potential damages caused by the plants. The Coleobrocks are insects of habit habitat, because they grow inside the trees, and can be vectors of diseases to them. Considering that little is known about the Caatinga 's biodiversity, especially on coleobrocas, this work aimed to know the composition, diversity and population fluctuation of coleobrocae of the subfamilies Scolytinae and Platypodinae (Curculionidae) and the Bostrichidae family in an area of Preserved arboreal shrub caatinga located at Fazenda Tamanduá in the municipality of Santa Terezinha, Paraíba. For this, weekly collections with the use of ethanolic traps were carried out from January 2015 to January 2016. 652 specimens were collected, belonging to seven genera and nine species. The subfamily Scolytinae was the most representative in quantity of species and individuals collected, followed by Bostrichidae and Platypodinae. Hypothenemus was the richest and most abundant genus, with three species and 419 individuals. The most abundant species were Hypothenemus eruditus, Xylionulus transvena and Xyloperthella picea, with H. eruditus being the most abundant species, with 60.43% of the total caught. Among the nine species collected H. eruditus and Xylionulus transvena occurred as eudominantes and constants, being the majority of the species sampled was rare and accidental. Scolytinae presented greater occurrence during the rainy season, unlike Bostrichidae that presented its population peaks during the dry period. The H. eruditus species presented their peak population in the rainy season, while Xylionulus transvena and Xyloperthella picea during the dry period. There was no correlation between coleobroca abundance and rainfall and temperature, however, there was a significant positive correlation between abundance and relative humidity.