Banca de QUALIFICAÇÃO: KASSIO PEREIRA DAS NEVES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : KASSIO PEREIRA DAS NEVES
DATE: 09/09/2024
TIME: 09:30
LOCAL: SALA AULA BLOCO 4B
TITLE:

Relationship between deforestation and variations in the fishing dynamics of frugivorous species landed in the Porto Velho fishing market

KEY WORDS:

Fishing; Degradation; Frugivorous Fish; Madeira River; Amazon 

PAGES: 40
BIG AREA: Ciências Agrárias
AREA: Recursos Pesqueiros e Engenharia de Pesca
SUMMARY:

Fishing in the Madeira River has significant socio-economic importance for the region. With a predominance of Characiformes and Siluriformes, which are migratory species, the frugivorous fish stand out as they depend directly on the floodplain forest for their conservation. This dependence makes them particularly vulnerable to the ongoing deforestation in the Amazon region. This study aims to: identify the most commercially important frugivorous species; evaluate the fishing dynamics of these species from 2004 to 2019; and assess the impact of vegetation cover loss on the fishing landings of frugivorous species from 2003 to 2020 in Porto Velho, Rondônia. To achieve these objectives, an analysis of Catch Per Unit Effort (CPUE), Shapiro-Wilk statistical tests, and multiple linear regression were conducted on historical data of landings and deforestation. To complement the quantitative data, semi-structured interviews were conducted with artisanal fishermen with over 10 years of experience, identifying major environmental changes and shifts in fishing dynamics in the region. Preliminary results indicate that between 2006 and 2021, the Madeira River Basin experienced a loss of 130,957 km² of forest (16.5%) and 25,192 km² of floodplain forest (8%). This deforestation correlates with a reduction of approximately 70% in the catch of five frugivorous species. The analysis revealed a significant negative correlation between deforestation rates and the CPUE of frugivorous species, indicating that increased deforestation reduces fish availability. Among the species studied, sardine (Triportheus spp.) and tambaqui (Colossoma macropomum) show significant variations in captured biomass, reflecting the impacts of factors such as hydroelectric dam construction, deforestation, and changes in hydrographic flow. Although the catch of frugivorous fish has decreased, the average length of the fish remains stable, suggesting a focus on larger individuals in the fishing effort. Interviews with 51 fishermen from four riverside communities revealed that upstream of the dam, the main problems reported were the mortality of important plants and river contamination, while downstream, issues included decreased water flow and difficulties in fish migration due to the dams. Preserving floodplain forests and adapting fishing practices are essential to protect biodiversity and local livelihoods. Integrating traditional knowledge with scientific methods is often necessary to improve fisheries management and aquatic resource conservation, aiding in the creation of laws and protected areas for floodplain forests, aiming for the sustainability of ecosystems and riverside communities.

COMMITTEE MEMBERS:
Presidente - ***.324.392-** - MARCELA ALVARES OLIVEIRA - UNIR
Interno - ***.701.522-** - MARCELO LUCIAN FERRONATO - UNIR
Externa à Instituição - AMANDA CANTARUTE RODRIGUES