DSpace Communidade:http://repositorio.ufc.br/handle/riufc/102026-04-23T14:07:43Z2026-04-23T14:07:43ZMetabarcoding revela a dinâmica espaço-temporal de protistas planctônicos em um estuário do semiárido brasileiroDuarte, Gerusa de Freitas Sousahttp://repositorio.ufc.br/handle/riufc/859592026-04-23T12:45:34Z2025-01-01T00:00:00ZTítulo: Metabarcoding revela a dinâmica espaço-temporal de protistas planctônicos em um estuário do semiárido brasileiro
Autor(es): Duarte, Gerusa de Freitas Sousa
Abstract: Protists are eukaryotic microorganisms that play key ecological roles in aquatic ecosystems; however, little is known about their diversity in Brazilian semi-arid estuaries. In this context, environmental DNA (eDNA) metabarcoding is a powerful tool for characterizing this diversity. This study investigated the spatiotemporal dynamics of protist communities in a semi-arid tropical estuary throughout 2022, considering three seasonal periods (rainy, transitional, and dry) and two plankton fractions: picoplankton (0.2 µm) and nano-microplankton (3.0 µm), based on sequencing of the V4 region of the 18S rRNA gene. Using Principal Component Analysis (PCA), mean values, and ANOVA and Tukey’s tests, it was observed that the environmental variables exhibited strong spatial heterogeneity, with the lower portion showing higher values for salinity, depth of the euphotic zone, and dissolved oxygen, while the upper portion had higher concentrations of chlorophyll and nutrients. The protist assemblages were highly diverse and dominated by diatoms, varying along spatial and seasonal gradients. Alpha diversity, as indicated by the richness, Shannon, and Simpson indices, was highest during the rainy season and in the lower estuary, while the lowest values were recorded in the upper estuary, especially during the transition period. Analyses using Non-Metric Multidimensional Scaling (NMDS) and Permutational Analysis of Variance (PERMANOVA) indicated that the taxonomic composition was primarily shaped by the interaction between seasonality and estuarine location, with beta diversity being predominantly explained by turnover. The linear regression model identified salinity and inorganic phosphorus as the main environmental factors influencing the larger organisms, whereas no significant environmental factors were identified for the smaller fraction. The results reveal complex spatiotemporal dynamics in the protist community, with a predominance of diatoms in the Pacoti River estuary, highlighting the importance of integrative approaches and long-term monitoring for the conservation of semi-arid estuaries in the face of anthropogenic pressures and climate change.
Tipo: Dissertação2025-01-01T00:00:00ZValoração ambiental do ecossistema manguezal no Ceará: contribuições dos serviços ecossistêmicos nas políticas públicasFreitas, Anderson Nonato dehttp://repositorio.ufc.br/handle/riufc/859582026-04-23T12:38:42Z2026-01-01T00:00:00ZTítulo: Valoração ambiental do ecossistema manguezal no Ceará: contribuições dos serviços ecossistêmicos nas políticas públicas
Autor(es): Freitas, Anderson Nonato de
Abstract: Mangroves play a relevant role in the provision of ecosystem services, including shoreline protection, biodiversity conservation, regulation of ecological processes, and support for socioeconomic activities. Despite their importance, these ecosystems have been subjected to continuous degradation processes associated with urban expansion, aquaculture, anthropogenic activities, and changes in land use and land cover. In this context, the economic valuation of ecosystem services is configured as a planning instrument capable of expressing, in monetary terms, the benefits generated by mangroves, contributing to comparative analyses within the scope of the formulation and evaluation of public policies. This study aimed to carry out the environmental valuation of ecosystem services provided by mangrove forests in the State of Ceará and to analyze how these values relate to public policies aimed at the conservation and sustainable use of these environments. The research was based on the analysis of the spatial dynamics of mangroves over time, using land use and land cover data, and on the application of the benefit transfer method to estimate the economic values associated with ecosystem services. In addition, a bibliometric analysis of the scientific production on environmental valuation, ecosystem services, and mangroves was conducted. The analysis indicated an increase in the area of mangrove forests, concomitant with a reduction in apicum areas, highlighting changes in the configuration of these coastal environments over recent decades. The bibliometric analysis revealed the evolution and thematic concentration of research on ecosystem services, indicating the growth of scientific interest in the topic and its relationship with global environmental agendas. The results of the environmental valuation indicated expressive values, especially for regulating services, reaching the order of billions of reais, highlighting the economic relevance of these ecosystems and enabling the analysis of the relationship between the estimated values for mangrove ecosystem services and the resources allocated in state planning instruments. Thus, the study sought to contribute to the advancement of scientific knowledge on the valuation of coastal ecosystems and to provide support for decision-making processes in the context of environmental management and the conservation of mangroves in Ceará.
Tipo: Tese2026-01-01T00:00:00ZDistribuição e abundância dos peixes da área de proteção ambiental das dunas de Paracuru –Ce, BrasilArruda Filho, Rômulo Roussel CavalcanteCarneiro, Benaya SandersAraújo Júnior, José Mozart de AlbuquerqueSalles, Rodrigo dehttp://repositorio.ufc.br/handle/riufc/859302026-04-22T13:09:25Z2026-01-01T00:00:00ZTítulo: Distribuição e abundância dos peixes da área de proteção ambiental das dunas de Paracuru –Ce, Brasil
Autor(es): Arruda Filho, Rômulo Roussel Cavalcante; Carneiro, Benaya Sanders; Araújo Júnior, José Mozart de Albuquerque; Salles, Rodrigo de
Abstract: This article aimed to contributeinformation about the basic ecology of fish populations in the Paracuru Dunes Environmental Protection Area. From two field campaigns, carried out in 2020 and 2022, the following environments were studied: interdune lagoons, lagoons located in the deflation zone, streams that flow into the sea,and the Botija stream. The 80 samples revealed the existence of 14 species, distributed in ten families and eight orders. Currently, no species is at risk of extinction. Biodiversity was considered low, considering the absolute number of species and the values of the ecological diversity indexes (between 0.97 and 1.43) and species richness (between 0.45 and 1.52). Consequently, equitability was also low, with numerical participation concentrated in four species: Poecilia vivipara, Cichlasoma orientale, Astyanax bimaculatus,and Oreochromis niloticus. In addition to being dominant, the last species was classified as an invasive exotic, therefore, with a high potential for environmental impact. The species Steindachnerina brevipinnaand Crenicichlasp. are also not part of the native faunabut offerlower risk potential. It is believed that the difference in fish assemblages is related to the level of connectivity and environmental characteristics of the different aquifers.
Tipo: Artigo de Periódico2026-01-01T00:00:00ZNovos métodos para restauração marinha através dos “SAR” (simbiotic artificial reefs)Villavicencio, Carolina Brachohttp://repositorio.ufc.br/handle/riufc/857942026-04-16T12:26:09Z2025-01-01T00:00:00ZTítulo: Novos métodos para restauração marinha através dos “SAR” (simbiotic artificial reefs)
Autor(es): Villavicencio, Carolina Bracho
Abstract: Artificial reefs (ARs) are a tool used for several decades to actively restore marine-coastal ecosystems and fisheries resources. However, RAs have been implemented without planning, causing several environmental impacts and suspicion of their use in restoration programs. This thesis aimed to determine the optimal characteristics for ARs to be successful in restoring marine and coastal ecosystems. This mainly relates to SDGs 13 (climate action) and 14 (life below water). Thus, the study was divided into three chapters. The first chapter addresses a discussion on ARs in Brazil, exploring their history, key scientific knowledge and future perspectives, thus providing from an ecological perspective a decision-making tool on the use of ARs to avoid several environmental impacts that have already occurred in the country (i.e., introduction of exotic species, use of polluting materials, etc.). In the second chapter, a systematic literature review (SLR) was carried out on the state of the art of ARs in the world between xx-xx, including a meta-analysis on the effectiveness of ARs in resembling natural reefs (NRs), with the Bray-Curtis similarity index as a measure of success in restoring marine and coastal ecosystems. Important information gaps are highlighted regarding socioeconomic aspects; design, materials and layout in the selected habitats; legal, management and planning aspects considering long-term monitoring. Regarding efficacy, few articles (n=13) allowed appropriate comparisons between ARs and NRs, highlighting the need to apply adequate reference sites in these implementations. The meta-analysis showed that ARs are not similar to reference NRs (p=0.03 and p=0.05 for common and random effect models, respectively). A high level of heterogeneity (88%) indicates that this relationship may be influenced by factors other than the nature of the reef. However, some ARs that were successful in resembling NRs provided more accurate directions in this regard. In the third chapter, an experimental study was carried out in the city of Porto Cesario, Italy, between October 2019 and September 2021. The effectiveness of organic materials known to provide nutrients, degrade pollutants and reduce the risk of pathogens in terrestrial ecosystems was tested. Experimental plates of biochar, bioferment and concrete (control) were photographed at different times during the study period. The coverage of taxonomic groups was estimated using Photoquad software and analyzed with univariate and multivariate PERMANOVA using material and time as factors. Significant differences were detected between material, time and their interaction, showing an ecological succession with changes in community composition through the colonization periods. Biochar achieved a higher coverage of marine organisms in a shorter colonization time, compared to bioferment and the control, which is required in restoration programs, as well as being an optimal material for submersion. Degraded reef ecosystems have opportunities to be restored through ARs, whenever a scientific and logical planning with space-time specificity is applied.
Tipo: Tese2025-01-01T00:00:00Z