http://repositorio.ufc.br/handle/riufc/24652 2026-04-10T12:31:48Z 2026-04-10T12:31:48Z Sousa, Lara Isabelly de Freitas http://repositorio.ufc.br/handle/riufc/85739 2026-04-09T17:05:03Z 2026-01-01T00:00:00Z

Título: Ocorrência de parabenos em fluidos do caranguejo-uçá (Ucides cordatus) e seus riscos associados em estuários da margem equatorial brasileira Autor(es): Sousa, Lara Isabelly de Freitas Abstract: Parabens, widely used as preservatives in consumer products, are classified as contaminants of emerging concern (CECs) and endocrine-disrupting chemicals (EDCs), representing a growing concern for environmental health, especially in aquatic ecosystems. This work presents an innovative approach by investigating the occurrence, spatial distribution, and exposure risks of these compounds in biological fluids (urine and hemolymph) of the mangrove crab (Ucides cordatus), an essential bioindicator in estuaries of the Brazilian Equatorial Margin. The methodology involved collecting samples from four estuaries (Parnaíba River, Cocó River, Jaguaribe River, and Piranhas-Açu River) and analyzing p-hydroxybenzoic acid (4-HB), methylparaben (MeP), and ethylparaben (EtP) through enzymatic hydrolysis and chromatography, complemented by non-parametric statistical analyses. The results evidenced the widespread presence of parabens in the organisms, with mean 4-HB concentrations of 87.73 ± 172.71 μg/L in urine and 42.75 ± 61.50 μg/L in hemolymph, indicating the crabs' broad exposure. Furthermore, it was observed that EtP concentrates more in urine, while MeP concentrates in hemolymph, revealing differences in metabolization and excretion processes. The analysis of the condition factor (K) demonstrated significant variations among sites, suggesting different nutritional states and environmental pressures. Although the assessment of non-carcinogenic risk to human health (HQ) indicated that estimated exposure levels through crab consumption do not pose an immediate risk, the results reinforce the use of U. cordatus as a bioindicator and highlight the integrated analysis of urine and hemolymph as a non-invasive and effective approach for biomonitoring CECs in estuarine ecosystems. The study contributes significantly to the knowledge of contamination in the BEM and establishes bases for future ecotoxicological investigations and management strategies. Tipo: TCC

2026-01-01T00:00:00Z Silva, Pedro Renato Câmara da http://repositorio.ufc.br/handle/riufc/85738 2026-04-09T17:02:45Z 2026-01-01T00:00:00Z

Título: Efeitos da seca prolongada sobre a ictiofauna marinha-migrante em um estuário da costa semiárida brasileira e sua contribuição para o fornecimento de serviços ecossistêmicos Autor(es): Silva, Pedro Renato Câmara da Abstract: Estuaries play a fundamental role as nursery areas, connecting continental and marine environments and supporting important ecosystem services, such as the provision of fishery resources and the regulation of matter and energy flows. On the semi-arid coast of Brazil, these environments are strongly influenced by extreme climatic variations, especially prolonged drought events, which intensify marine intrusion and alter the structure of fish communities. This study aimed to describe variations on biomass and composition patterns of migratory marine fish (guild that represents 50% of the ichtyofauna in estuaries from Brazilian semiarid region) during periods of prolonged drought and regular rainfall, and to evaluate their implications for the ecosystem services of provision and regulation in the Curu River estuary (CE). Data collected during campaigns conducted during the prolonged drought (2014–2015) and in two periods with regular rainfall (2021–2022 and 2023–2024) were analyzed, considering only migratory marine species, classified into trophic guilds. Analyses indicated that the total biomass of this guild was significantly higher during the prolonged drought, being at least eight times greater than during periods of regular rainfall. There were significant differences in species composition and trophic guilds between the periods, with greater dominance of detritivorous and omnivorous species during the drought. Species of high ecological and fisheries importance, such as Mugil curema, Eugerres brasilianus, and Eucinostomus argenteus, showed greater abundance on years of prolonged drought. These results suggest that, under the observed conditions, the prolonged drought enhanced the estuary's nursery function and increased the availability of fishery resources, in addition to reinforcing the role of fish in nutrient recycling and estuary-sea connectivity. However, changes resulting from climate changes and the intensification of extreme events may lead these systems to an environmental threshold, from which the increase in salinity may compromise the diversity and maintenance of ecosystem services provided by estuarine ichthyofauna. Tipo: TCC

2026-01-01T00:00:00Z Alves, Meiryel dos Santos http://repositorio.ufc.br/handle/riufc/85712 2026-04-08T13:46:49Z 2026-01-01T00:00:00Z

Título: Uso e ocupação do solo e seus impactos na morfodinâmica costeira do Parque Nacional de Jericoacoara Autor(es): Alves, Meiryel dos Santos Abstract: Jericoacoara National Park (PNJ) is a highly complex coastal system where growing pressure from land use and occupation, driven by tourism, threatens the natural dynamics of the dunes. This study aimed to understand the interrelationships between anthropogenic expansion and coastal morphodynamic processes in PNJ. An integrated approach was used, combining multitemporal geoprocessing (1958-2025) for mapping land use and road networks, morphohydrological analysis (MDE), and sedimentological characterization of cross-sections of the coast. The results revealed a reversal of the wind matrix, with a reduction in mobile dunes (from 56,80% to 22.2%) and expansion of the road network (from 6 km to 70.50 km), demonstrating the transition from natural morphodynamics to a system dominated by human intervention. The morpho-hydrological analysis identified that 4x4 vehicle tracks act as artificial erosion channels, disrupting the drainage system and compromising groundwater recharge, which is reflected in the widespread reduction of surface water bodies (-44.44%). Sedimentological characterization reinforced the vulnerability of the system, evidenced by the selectivity of wind transport and the hybrid sedimentological signature. It is concluded that anthropic pressure is the main geomorphic agent of change, and the implications of the study provide essential technical support for the adaptive management of the PNJ, highlighting the need to review the guidelines for use in areas of hydrogeomorphological conflict, aiming at the conservation of ecological integrity and the sustainability of tourism. Tipo: TCC

2026-01-01T00:00:00Z Silva, Karoline de Sousa http://repositorio.ufc.br/handle/riufc/85709 2026-04-08T12:58:36Z 2026-01-01T00:00:00Z

Título: Quanto cabe de riqueza florística em parques urbanos? A diversidade vegetal e os conflitos socioambientais em áreas verdes públicas da cidade de Fortaleza, Ceará Autor(es): Silva, Karoline de Sousa Abstract: Urban expansion over recent centuries and the way cities are organized have resulted in an increasing concentration of the human population in urban centers. Fortaleza has lost a large portion of its vegetation cover throughout its expansion, with approximately 83.7% of its area lacking native vegetation. Urban parks are green areas, characterized by a predominance of natural attributes and vegetation cover, and they play important ecological and social roles. Despite these benefits, several challenges exist in the coexistence between cities and natural environments, which primarily affect both the environment and the population. This study aimed to present an overview of the floristic richness recorded in 24 urban parks in Fortaleza, distinguishing native from exotic species, using rarefaction to estimate the total botanical richness of the parks, and identifying the main socio-environmental conflicts present in each one. The floristic inventory of each park was conducted by the Fortaleza Municipal Secretariat of Urbanism and Environment (SEUMA) through field surveys using the walking method, in which the author participated as an assistant in part of the field activities. Species were identified and photographically recorded, as were the socio-environmental conflicts, and socio-environmental diagnoses for each of the 24 parks were subsequently made available, from which the flora and conflict data used in this study were obtained. The software EstimateS was used for rarefaction analyses, along with the ICE, Chao 2, Jackknife 2, and Bootstrap estimators for expected species richness, while QGIS 3.22.4 was used for map production. A total of 534 species were recorded across the 24 urban parks, of which 205 were exotic, 99 native to Brazil, and 228 native to the state of Ceará. Among the species found in common in more than 19 parks, six were native and ten were exotic. The presence of three species classified as “Vulnerable”, two as “Endangered”, and one as “Near Threatened” was identified. The rarefaction curve did not reach an asymptote, and the Chao 2 estimator proved to be the most accurate for estimating the asymptotic species richness of the 24 parks. A total of 23 different socio-environmental conflicts were identified, with the most prevalent being exotic/invasive species, improper disposal of solid waste, and irregular discharge of effluents, which were present in nearly all parks. Therefore, the implementation of more effective management practices in these green spaces is essential, as well as replacing and reducing the cultivation of exotic species, especially invasive ones, by prioritizing the planting of native species in urban parks, in addition to integrating the population with the city’s green areas through environmental education and strengthening monitoring and enforcement in urban park areas. Tipo: TCC

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