Diversidade de entomobryoidea (Collembola: Entomobryomorpha) em uma área de cerrado stricto sensu do Parque Nacional de Sete Cidades, Piauí, Brasil

Abstract

Collembola are small arthropods with body sizes ranging from 0.12 to 17 mm, distributed throughout all terrestrial ecosystems. This study aims to describe the diversity of epigeic Entomobryoidea in an area of cerrado stricto sensu in the Parque Nacional de Sete Cidades, State of Piauí, and compare it with the diversity of two other studies carried out in areas with different phytophysiognomies. The specimens were captured with 400 mL pitfalls, which were exposed for 48 hours. Air and soil temperatures, leaf litter height, soil moisture and vegetation cover were measured. Diversity was estimated using the Shannon-Wiener, Pielou and Simpson indices. Sampling sufficiency was assessed using a species accumulation curve based on individuals from the three areas. The similarity between areas was analysed using the Jaccard and Bray-Curtis indices. The influence of environmental variables on diversity patterns was studied using Principal Component Analysis, Correlation Analysis and Canonical Correspondence Analysis. A total of 419 individuals were collected from the cerrado stricto sensu. The Shannon-Wiener index was 1.54 and the Pielou value was 0.67. Simpson's index was 0.72. The species composition of the cerrado stricto sensu area has greater similarity between them, while species from the Caatinga-Cerrado and cerradão transition areas have a closer similarity. The environmental variables that best explained the diversity found were soil temperature, vegetation cover and air humidity.