Banca de QUALIFICAÇÃO: AUGUSTO CÉSAR CAVALCANTI GOMES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : AUGUSTO CÉSAR CAVALCANTI GOMES
DATE: 18/12/2023
TIME: 14:00
LOCAL: Google Meet (https://meet.google.com/rvv-siuy-wkj)
TITLE:

IMPACTS ON WATER QUALITY CAUSED BY ANTHROPIZATION IN THE RIPARIAN ZONE OF RESERVOIRS IN THE BRAZILIAN TROPICAL SEMI-ARID

KEY WORDS:

anthropization; watershed; eutrophication; Geographic Information System; riparian forest

PAGES: 40
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

The effects of anthropization of the terrestrial ecosystem impact aquatic ecosystems, which act as final receptors of nutrient influx from the watershed through surface soil processes. The use of Geographic Information System (GIS) can contribute to the sustainable management of these ecosystems and assist in decision-making regarding measures to protect riparian zones and aquatic ecosystems. The objective of our study was to assess the influence of land use and land cover in riparian zones on the water quality of reservoirs in the tropical semi-arid region. We hypothesized that smaller reservoirs are more immediately affected by anthropogenic effects of land use and land cover categories. The study was conducted in 17 shallow reservoirs in the tropical semi-arid region, located in the watersheds of the Apodi-Mossoró, Piranhas- Açu, and Paraíba rivers in northeastern Brazil. Analyses of land use and land cover in the riparian zone were performed within a zoning of 100 meters from the edge of each reservoir. The land use and occupancy categories used were: floodable, dense caatinga (a type of vegetation), sparse caatinga, exposed soil, and urban. Reservoirs were classified as Large or Other based on surface area (greater or less than 100 hectares, respectively). Limnological variables of water were analyzed to infer nutrients affecting water quality. Riparian zones of the reservoirs showed a high rate of anthropization due to the land cover of agricultural/pasture areas, exposed soil, and urban. The effects of anthropization on water quality received contributions from limnological variables such as suspended solids, carbon fractions,  hlorophyll-a, and total phosphorus. The flooding area of the reservoir in large proportions was not the dominant factor in delaying the effects of decreasing water quality. Climatic effects were predominant in intensifying reservoir eutrophication, as these ecosystems experienced a significant period influenced by the drought recorded in the last decade.

COMMITTEE MEMBERS:
Externo à Instituição - JULIANA DOS SANTOS SEVERIANO
Externa ao Programa - 3216945 - HÉRIKA CAVALCANTE DANTAS DA SILVA - nullInterna - 2412921 - JULIANA DEO DIAS
Presidente - 1764855 - VANESSA BECKER