Banca de QUALIFICAÇÃO: ATHILA RAFAEL RÊGO REIS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ATHILA RAFAEL RÊGO REIS
DATE: 14/08/2023
TIME: 09:00
LOCAL: Sala 432 - BMT2 - UFOPA/Campus Tapajós
TITLE:

THE TRANSVERSALITY OF THE RIO TAPAJÓS: AN ANALYSIS OF FEEDING HABITS IN THE ICTIOFAUNA.

KEY WORDS:

Invertebrates, fishery resources, feeding habits, fish.

PAGES: 33
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

The investigation of dietary habits in fish has played a crucial role in expanding the understanding of mechanisms governing tropical aquatic ecosystems. Nutritional ecology can explain part of the irregularity in consumer behavior within various communities, predict potential changes in food chains, and transfers of material and energy both within and between ecosystems. The dynamics of river systems shaping wetland environments, rich in species, are being severely altered in many large rivers, making it important to propose a hierarchical framework for examining diversity patterns in wetland rivers, highlighting the significance of ecotones and connectivity in maintaining biodiversity. Understanding the feeding patterns of these species is fundamental for the preservation of aquatic biodiversity and ensuring the sustainability of fishery resources in the Amazon region. Accordingly, this study aims to analyze the relevance of insects as a food source for fish species and emphasize the importance of conserving habitats for the maintenance and preservation of ichthyofauna. To carry out this research, fish were collected from points along the Tapajós River (middle and lower stretches), State of Pará, eastern Amazon Basin. The Tapajós River is a clear-water river, being the fifthlargest tributary of the Amazon, with a drainage area of 493,200 km2. The collections were made in the communities of Barreiras, Cauaçuepá, and Suruacá during the months of June (flood season) and November (dry season) in the year 2022. For fish collection, 70-meter long gill nets were used. Each set consisted of seven nets, each 10 meters long, 1.5 meters high, and with mesh sizes of 1.5; 2; 3; 5; 6; 7; and 10 cm in non-adjacent intervals. Additionally, three seine hauls were conducted during the night, along the margins of the same sampling point, using humanpowered seine nets. These seine nets were 7 meters long with 5-millimeter meshsize opposite knots. The specimens found in the stomachs of the fish will be identified to the lowest possible taxonomic level using stereoscopic microscopy. For this purpose, the state of fullness will be observed, and subsequently, the frequency of occurrence (Fo%) and the index of dietary overlap will be calculated to perform statistical analyses. The study expects to identify the main food sources for the studied fish species, revealing trophic interactions, and the relative importance of different resources in the fish diet. The aim is to propose recommendations for sustainable management in the Tapajós River basin.

COMMITTEE MEMBERS:
Presidente - 1528246 - JOSE AUGUSTO TESTON
Interna - 1995892 - SIRIA LISANDRA DE BARCELOS RIBEIRO
Externo à Instituição - RONY PETERSON SANTOS ALMEIDA - MPEG