http://repositorio.ufc.br/handle/riufc/10 Thu, 18 Jun 2026 03:01:10 GMT 2026-06-18T03:01:10Z https://repositorio.ufc.br:443/ri/retrieve/49584438-4901-4e4c-9ea4-bdbd8ca0e086/comunidade_LABOMAR-RI-moldurado.jpg http://repositorio.ufc.br/handle/riufc/10 http://repositorio.ufc.br/handle/riufc/86756 Título: Distribuição de metais-traço (Cu, Cd, Pb e Zn) em quatro espécies de tartarugas marinhas da costa do Nordeste do Brasil Autor(es): Campos, Yuri Lima Abstract: Sea turtles are long-lived organisms widely distributed in coastal environments and are recognized as important models for studies of environmental contamination, especially by persistent pollutants such as metals. In this context, the present study aimed to evaluate trace metal concentrations in four species of sea turtles, as well as to identify the main biological, ecological, and environmental factors influencing the levels of these metals in these species. To achieve this, considering that these animals are threatened with extinction, priority was given to the use of non-invasive methods, such as the use of carapace fragments, and, whenever possible, tissues from dead individuals were also used. Concentrations of copper (Cu), cadmium (Cd), lead (Pb), and zinc (Zn) were quantified in four species of sea turtles found along the northeastern Brazilian coast: Chelonia mydas, Eretmochelys imbricata, Caretta caretta, and Lepidochelys olivacea. Bioaccumulation patterns were associated with feeding habits in two of the four species, investigated through stable isotope analysis of carbon (¹³C) and nitrogen (¹⁵N), in addition to the evaluation of morphological data and estimation of life stage. No significant differences in metal concentrations were observed among sampling areas for each species, when comparisons were possible, suggesting the absence of spatial variation in the evaluated regions. Therefore, samples from northeastern Brazil were consolidated as a single analytical unit for each species. Cu concentrations differed among species, with C. caretta showing the highest values and L. olivacea the lowest. Cd was predominantly below the detection limit and showed no interspecific differences. For Pb, C. mydas presented the highest concentrations, differing significantly from E. imbricata. Zn was the most abundant metal in the carapace and showed the greatest segregation among species, with higher values in C. caretta and L. olivacea. Significant interspecific differences were confirmed for Cu, Pb, and Zn. In the tissue analysis of C. mydas, Zn showed the highest concentrations, with no significant differences among tissues, suggesting homeostatic regulation of this element in the organism. Cu showed higher concentrations in the liver, with significant differences compared to the other tissues, reflecting its physiological role and participation in metabolic processes. Cd showed higher concentrations in the liver and kidney, associated with the formation of complexes with metallothioneins in these organs, which are involved in detoxification processes. Pb showed relatively similar concentrations among tissues, with a significant difference only between the carapace and muscle. Overall, the results indicate that variations in trace metal concentrations in sea turtles from northeastern Brazil reflect bioaccumulation patterns modulated by physiological and ecological characteristics of the species. These findings contribute to expanding knowledge about metal dynamics in these organisms and reinforce the importance of monitoring these species to better understand environmental contamination in marine ecosystems. Tipo: Dissertação Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86756 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86533 Título: Eficácia da gestão de áreas protegidas frente à proteção de recursos hídricos: estudo em unidades de conservação no litoral cearense Autor(es): Sousa, Kelven Pinheiro de Abstract: The state of Ceará presents a coastline with an extension of 626.89 km, with about 30 Protected Areas (PA) distributed throughout its coastal zone (terrestrial and maritime), featuring diverse environmental and social issues. Given this reality, this study aims to evaluate the effectiveness of the conservation of water resources, and their associated environmental assets, safeguarded in coastal PAs of Ceará. The researched area focuses on 7 PAs present in 2 sectors of the Ceará Coastal Plain (Fortaleza/Metropolitan Region and West Coast), which overlap with 2 hydrographic regions (Metropolitan and Curu), they are: Paracuru Dunes Environmental Protection Area, Curu River Estuary Environmental Protection Area, Ceará River Estuary Environmental Protection Area, Pacoti River Environmental Protection Area, Ceará Botanical State Park, Sítio Curió Area of Relevant Ecological Interest, and Batoque Extractive Reserve.. The study, of an exploratory and descriptive nature, was developed in three complementary stages: (i) systematic literature review on water conservation in protected areas; (ii) environmental and territorial diagnosis of the analyzed units; and (iii) integrated analytical stage, involving participatory methodologies, analysis of institutional perception, and evaluation of public policies by the Theory of Change (ToC) method, culminating in the proposal of the Water Status Index of Protected Areas (IEH-PA). Article I demonstrates the relevance of protected areas as a primary strategy for safeguarding ecosystems and water resources across the diverse territories observed. Article II establishes the issue of 'limitations' as the focal point of environmental conflicts/impacts and the ecological functions of the evaluated protected areas; it further demonstrates that the mere existence of these areas does not guarantee adequate environmental protection, thus requiring the active and permanent engagement of diverse stakeholders. Article III aligns the perspectives of managers and social actors within the evaluated territories, who acknowledge the importance of water conservation while identifying vulnerabilities in environmental monitoring, institutional coordination, and the need for broader social participation and inter-institutional partnerships. These factors collectively informed the development of the IEH-UC proposal, which aims to support the environmental monitoring of water resources within PA. Tipo: Tese Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86533 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86532 Título: A gestão de resíduos sólidos nos municípios costeiros brasileiros e suas implicações para o desenvolvimento sustentável Autor(es): Valentim, Breno Victor de Lima Abstract: The management of municipal solid waste (MSW) in Brazilian coastal municipalities represents a multidimensional challenge involving socioeconomic, infrastructural, environmental, and institutional aspects. In this context, this study aimed to analyze the relationship between socio-territorial characteristics and urban cleaning performance, measured by the Urban Cleaning Sustainability Index (ISLU), considering its interface with the Sustainable Development Goals (SDGs). A quantitative approach was adopted, analyzing 251 Brazilian coastal municipalities using secondary data from official sources. Normality tests and Spearman correlation analyses were applied to identify associations between ISLU and variables such as education level, waste collection, sewage access, urbanization, and environmental public policies. The results revealed significant interregional disparities, with better performance in the South and Southeast regions and lower indicators in the North and Northeast. A moderate positive correlation was observed between ISLU and socioeconomic variables, especially education level, highlighting the importance of education in promoting sustainable practices. In contrast, municipal environmental policies showed weak correlation with the index, suggesting limitations in their effectiveness and implementation. The analysis also identified inequalities related to race, revealing patterns of environmental racism in access to sanitation and urban cleaning services. It is concluded that MSW management goes beyond technical dimensions and is intrinsically linked to structural inequalities in the Brazilian territory. Therefore, strengthening intersectoral policies focused on environmental education, social inclusion, institutional cooperation, and socio-environmental justice is recommended to achieve the goals of the 2030 Agenda. Tipo: Dissertação Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86532 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86426 Título: Optimal levels of methionine and the impact of water leaching in juvenile Penaeus vannamei diets Autor(es): Façanha, Felipe N.; Masagounder, Karthik; Nunes, Alberto J.P. Abstract: An 8-week feeding trial was conducted to determine the optimal levels of dietary methionine (Met) for juvenile Pacific whiteleg shrimp, Penaeus vannamei, while evaluating the effects of amino acid (AA) leaching. Six practical diets were formulated to be isonitrogenous and isolipidic, with total Met levels ranging from 0.51 % to 1.37 % in 0.14–0.21 % increments, and total sulfur AA (Met + Cysteine) levels from 0.88 % to 1.75 % on a dry matter basis (DM). The total nitrogen content was balanced across all diets by replacing Met with a non-essential AA mixture. Each diet was randomly assigned to seven replicate groups of 15 juvenile shrimp with an initial body weight (BW) of 0.80 ± 0.05 g. Shrimp were fed six times daily until apparent satiation. The effects of varying dietary Met levels on survival, growth performance, feed utilization, and muscle tissue composition were evaluated, with Met leaching rates measured at 30 minutes in full-strength seawater. Results showed consistently high survival rates across all treatments, while final shrimp BW significantly increased with higher Met levels, particularly between diets containing 0.82 % and 0.99 % Met. Met leaching rates positively correlated with synthetic Met supplementation, significantly increasing as total dietary Met concentration rose. Muscle tissue composition analysis highlighted Met’s crucial role in protein synthesis and physiological function, revealing significant differences in crude protein and essential AA deposition among dietary treatments. Higher dietary Met promoted optimal protein and AA muscle content up to 0.82 %, after which a saturation effect was observed. In conclusion, this study emphasizes the importance of accounting for nutrient leaching when determining optimal AA levels for juvenile P. vannamei. Quadratic regression analysis indicated that an optimal dietary Met level of approximately 1.04 % in the dry diet (2.73 % of dietary protein) was most effective under these experimental conditions. Considering Met leaching rates to more accurately estimate the amount of Met available to shrimp after feed exposure to water, it was established that an optimal level of 0.74 % Met in the dry diet (2.20 % of dietary protein) after 30 minutes of immersion in water optimally supports growth and feed efficiency. This finding refines the actual optimal dietary Met level for juvenile Penaeus vannamei, establishing a new benchmark for future nutritional research in shrimp aquaculture. Tipo: Artigo de Periódico Wed, 01 Jan 2025 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86426 2025-01-01T00:00:00Z