1. Respostas da entomofauna aquática em relação às características do substrato e aos impactos do uso antrópico recreativo em um ambiente lótico.
- Author
-
dos Santos, Hannah Martins, Silveira Lecci, Lucas, and Aranda, Rodrigo
- Subjects
- *
AQUATIC insects , *INSECT communities , *RECREATIONAL use of rivers , *HABITATS , *CERATOPOGONIDAE , *CHIRONOMIDAE , *COMMUNITY relations , *MAYFLIES - Abstract
This work aim verifies the response of the aquatic insect community in relation to the intensity of human recreational use, in addition, the composition in different mesohabitats present in the watercourse. The samples were made in a stream in different microhabitats in areas classified by the visitor’s use (Low, Medium and Intense) and differentiated between four mesohabitats (sand, waterfall, leaf and stone). A total of 952 individuals in nine orders and 14 families were collected. The most abundant order was Diptera (431, 45.27%) followed by Ephemeroptera (366, 38.45%). The most abundant family was Baetidae (325, 34.14%), followed by Chironomidae (237, 24.89%), Simuliidae (94, 9.87%), Ceratopogonidae (77, 8.08%) and Hydropsychidae (56, 6.09%). Regarding to human use, there was a significant difference in fauna composition. In the area with intense use there was a predominance of Chironomidae and Hydroptilidae while in the area of low use Perlidae was the most frequent. The substrate stone presented the highest number of taxa. We observed a tendency for the composition of the community to differ between mesohabitats. The specific need of each biological group reflects the occupation of habitat, presenting different numbers of individuals. We can verify that the intensity of use of the waterfalls directly affects the aquatic insect community, either by disturbance and destruction of species-specific microhabitats or by the displacement of individuals along the stream. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF