Banca de DEFESA: KATIELE DE JESUS SACOMAN

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : KATIELE DE JESUS SACOMAN
DATE: 13/04/2022
TIME: 09:00
LOCAL: Campus Universitário de Rolim de Moura
TITLE:

EFFECT OF ARTIFICIAL BARRIERS, SEASON, AND DISTANCE FROM THE SOURCE ON THE FUNCTIONAL DIVERSITY OF FISH ASSEMBLY IN THE BRANCO RIVER BASIN

KEY WORDS:

Ichthyofauna, Functional traits, Dams, Amazon basin.

PAGES: 43
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

Characterizing the community structure, describing the roles of species in the environment and evaluating how changes in the system can affect the functionality of ecosystems has been one of the main topics addressed in ecological studies in recent decades. For this, several techniques have been proposed with the objective of facilitating the acquisition of data related to biological communities and the factors that change the functional diversity within an ecosystem. In aquatic environments, the construction of dams is one of the main factors responsible for changes in the structure of communities, so the objective of this work was to evaluate the impact of the dam on the functional diversity of fish assemblages in the Branco River basin. For this, collections were carried out in 13 sampling sites, distributed along the basin of the Branco River along of upstream, reservoirs and downstream portion. In addition, collections were carried out during the dry and wet seasons of 2017. Fish were collected using gill nets (12, 20, 30, 40, 60 and 80 mm meshes between adjacent nodes, 2 m high and 20 m long) and trawl net (6 m long, 2 m high and 2.5 mm mesh between adjacent nodes). Functional diversity was evaluated using the metrics of functional richness (FRic), functional uniformity (FEve), functional divergence (FDiv) and functional dispersion (FDis) which were computed based on four key functions, diet (trophic guilds), reproductive strategies, habitat use and body size. The FRic did not show differences between the seasons of the year, however it varied among the three sampled environments and as a function of the distance from the source. FEve did not show variation depending on the season of the year and the environment, however it showed a positive response with distance from the source. The FDiv and FDis indices did not vary as a function of the season, the sampled environment and the distance from the source. The results found corroborate the hypothesis that barrier-free environments, such as sites downstream, provide greater possibilities of resources, enhancing the use of all available niches by the species, which reflects in the functional diversity.

BANKING MEMBERS:
Interno - 1798567 - PAULO VILELA CRUZ
Externo à Instituição - HUGMAR PAINS DA SILVA - UFMT
Externo à Instituição - FABIANO CORRÊA - UNEMAT