Ocorrência de Imaturos de Odonata (Insecta) em Riachos de Baixa Ordem no Sudoeste do Paraná

Abstract

Odonata (Insecta) is one of several groups of invertebrates. These insects have the immature stage as inhabitants of water ecosystems and when adults, they are terrestrial. The different genera of Odonata have peculiarities for their occurrence and a distribution tendency that can vary according to the environmental quality. The distribution of Odonata fauna in Brazil is little known, where only 29% of the Brazilian territory has data on Odonata's diversity. Due to the importance of this group in the environment and the need for studies on environmental diversity and representativeness, the present work analyzed larvae of this order in different streams in southwestern Paraná. The composition of Odonata genera was identified and the influence of the landscape on the diversity of that group was observed. To carry out the research, nine streams were selected, three of them urban, three rural, and three with greater vegetation cover. Each stream was divided into three 10 meter long transects. In each transect, three replicates of physical and chemical analyzes of the water, and three collections of odonates were performed, totaling 27 collection points. Data collection was done in March 2020 and 92 individuals belonging to six families and twenty-two genders were collected. It was observed that some genera were found only in more preserved environments, while other genera were found only in more degraded environments or even some individuals were in places with more specific or restricted conditions. These genera can be used as environmental indicators. This work presented a fauna survey of Odonata in an area little studied in the Southwest region of Paraná. It is expected that it can serve as a reference and contribute to future studies.