Comparación de la eficiencia de trampas Barber y Malaise para el estudio de la biodiversidad de Hexapoda de vegas altoandinas

Abstract

The applicability of two methods for capturing and sampling hexapods inhabiting peatlands is communicated. The methods were based on the Barber and Malaise designs which were installed on three peatlands located in a High Andean sub-watershed of the Elqui River Basin (Region of Coquimbo, Chile). The study lasted three months and was conducted during the pick of biological activity at the site. In the analysis of taxonomic richness (Order in the case of Hexapoda and Family in the case of Diptera) were used the nonparametric estimators Chao 1, Chao-2, Jack-1, Jack-2 and Bootstrap. Together and for the entire study, the two combined methods provided 88217 specimens, recording a richness of 14 orders of Hexapoda and 29 families of Diptera. Both qualitatively and quantitatively the traps differed from each other in the record of taxa. At ordinal level, the combined methods gave a representation of ~ 99% of the orders of Hexapoda present in the peatlands. In the case of Barber-trapping, this representation reached ~ 98%; in the case of Malaise-trapping, it bordered 62 %. At level of families of Diptera, the combined methods gave a representation of ~ 98%. In turn, the representation with the Barber-trapping was ~69%, but skirted 84% with the Malaisetrapping. Since the Malaise trap was more affected by the windy conditions of the mountain than the Barber trap, the first one became a satisfactory complement to the latter, considering that the Barber trap not only caught soil animals, but also captured a significant fraction of flying and foliage-linked hexapods. The results of this work show that the Barber trap is a convenient device to study hexapods inhabiting these units of the Andean landscape. However, to expand coverage, its use must be complemented with Malaise trap or some other equivalent device. © 2014 Universidad de Tarapacá.