Composição preliminar e distribuição espacial da Odonatofauna na microbacia do Rio Sousa e no Rio Macacu, Cacheiras de Macacu, RJ com notas sobre dados abióticos (Insecta: Odonata)

Abstract

The preliminary composition and the distribution of the odonatofauna of the four collect sites, placed in a microbasin and in an upper region of a river were evaluated, based on samples realized for 12 months in Cachoeiras de Macacu, RJ. Climatological and hydrological data from the collect sites were obtained during the activities. The level of similarity among the communities analysed could be verified through the distribution of taxa in the places of study. The odonatological community presented a quite significant distribution, 51 tax; 39,21% represented by the family Libellulidae and 60,76% represented by the families Calopterygidae (11,76%), Coenagrionidae (11,76%), Megapodagrionidae (7,84), Protoneuridae (1,96%), Perilestidae (1,96%), Aeshnidae (5,88%), Gomphidae (15,68%) and Corduliidae (3,92%). Based on the Analysis of Discriminating Canonical Variants it could also be observed that there is an interference of the abiotic data on the composition and distribution of the communities analysed. The variation of hydrological parameters, directly related to trailing, is distinguished as the main factor of interference on the odonatofauna. Through surveys done, it was determined that Hetaerina brightwelli and Progomphus complicatus were the most representative taxa for the area. The small variation observed 011 the values of the abiotical data made evident relatively stable environments throughout the period of study.