Sazonalidade da riqueza e abundância de hymenoptera em caatinga e floresta ciliar no Semiárido Paraibano.

Abstract

Seasonality of hymenoptera richness and abundance in caatinga and riparian forest in the semiarid region of Paraíba. The Hymenoptera compose a group of ecologically important megadiverse insects in pollination and insect control themselves. Are present in nearly all terrestrial habitats and can be herbivores, predators and parasitic. The present study aimed to analyze structural aspects of the assemblage, seasonal variation, abundance and richness of Hymenoptera in two environments of Caatinga: an area of Caatinga (Caa) and in remnant of Riparian Forest (FC). The study took place at the Farm Tamanduá, Santa Terezinha, PB, (December 2010/October 2011). Sampling was weekly using Malaise traps installed continuously. Were recorded 8219 individuals: 3483 in the Caatinga and 4736 in the Riparian Forest, distributed in 31 families (28 and 3 in each area unique to each area), and 681 species (313 and 561 in Caa and FC, respectively). The Formicidae family was the most abundant, followed by Crabronidae and Chalcididae in the two areas together. Chalcididae was the most diverse followed by Pompilidae. Regarding dominance most species was rare (< 1 %), only one species was considered eudominante (> 10% ). As for consistency, 14 were constant, 41 and 626 ancillary accidental. There were significant differences regarding abundance and richness between the dry and rainy season in the Caatinga. The increase in abundance in Riparian Forest accompanied by a decrease in the Caatinga dry period showed that the first acts as a refuge for some groups of Hymenopter