Trophic guilds of stream fish along the urbanization gradient of the Upper Tietê basin, SP

• Grant number: 22/11650-5
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2022
• End date: April 30, 2024
• Field of knowledge: Biological Sciences - Ecology - Applied Ecology
• Principal Investigator: Lilian Casatti
• Grantee: Yullia Kaory Shimizu Alves
• Host Institution: Instituto de Biociências, Letras e Ciências Exatas (IBILCE). Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. São José do Rio Preto , SP, Brazil

Abstract

The accelerated expansion of cities over natural environments ends up including the streams in the urban landscape, causing a series of negative effects, among which is the change in the availability of food resources for fish. Thus, the objective of this study is to determine how the urbanization gradient is reflected in the trophic structure of the stream fish fauna in the Upper Tietê River basin. The fishes were collected in 30 microbasins with different percentages of urbanizationcontentes. Up to 30 specimens of 12 species will have their stomach contentes analyzed. The differences in the representativeness of autochthonous and allochthonous resources will be determined together with the differences in the trophic structure along the urban-forest gradient. When observed significant relationship between trophic structure and gradient, the guilds with the greatest contribution to explanation of these diferences will be identified. It is expected that the products obtained from this research will serve as a basis for future conservation actions in streams with high degree of anthropization.