Banca de DEFESA: JERONIMO CARVALHO MARTINS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JERONIMO CARVALHO MARTINS
DATE: 28/08/2025
TIME: 09:30
LOCAL: Google Meet
TITLE:

Spatio-temporal diversity of fish assemblages in the area of influence of the Tucuruí Hydroelectric Power Plant (PA, Brazil)

KEY WORDS:

Tucuruí dam; abundance; richness; beta diversity; LCBD; SCBD.

PAGES: 82
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

The fragmentation of rivers through the construction of dams and hydroelectric power plants has transformed river ecosystems, affecting the free movement of organisms between environments. In areas affected by reservoirs, fish assemblages reflect short and long-term impacts, making it necessary to understand the new distribution patterns of fish species that now structure communities. On the Tocantins River, the construction of the Tucuruí Hydroelectric Power Plant (Tucuruí HPP) was one of the most aggressive anthropogenic activities on the region's aquatic environment, causing changes in the biology, composition, and structure of the local fish fauna. However, identifying the effects of aquatic environment modification on fish assemblages remains a challenge, and therefore, this thesis seeks to analyze the spatiotemporal diversity of fish assemblages in the area of influence of the Tucuruí Hydroelectric Power Plant. In the first chapter, we described the spatial distribution patterns of fish communities, assessing abundance, richness, and species composition upstream and downstream of the Tucuruí Dam. Species abundance and richness were higher upstream of the dam, with richness positively correlated with distance from the dam and rainfall. Species composition varied between regions, with generalist and opportunistic species dominating upstream areas, while species tied to specific habitats predominated downstream of the dam. In Chapter 2, we analyzed the Local Contribution to Beta Diversity (LCDB) and Species Contribution to Beta Diversity (SCBD) contributions throughout the area of influence of the Tucuruí HPP. The area upstream of the dam is experiencing biotic homogenization suggested by low beta diversity. The positive interaction between distance from the dam and rainfall with LCBD highlighted the influence of varying environmental conditions on the uniqueness of the ichthyofauna located upstream. The species that play a fundamental role in the formation of beta diversity are those with the greatest abundance, largest area of occupancy, and intermediate size. The results indicate the complexity of the environmental impacts generated by the Tucuruí Dam and its influence on fish abundance and diversity patterns in the lower Tocantins River.

COMMITTEE MEMBERS:
Externo à Instituição - ISRAEL HIDENBURGO ANICETO CINTRA - UFRA
Externo à Instituição - BIANCA BENTES DA SILVA - UFPA
Externo à Instituição - RAFAELA ALVES SANTOS VENDRAMETTO GRANZOTTI - UFG
Presidente - 1545394 - FULVIO AURELIO DE MORAIS FREIRE
Externa à Instituição - URSULLA PEREIRA SOUZA