DSpace Communidade:http://repositorio.ufc.br/handle/riufc/569942026-07-18T20:44:27Z2026-07-18T20:44:27ZEstudo florístico-taxonômico no gênero Lepidaploa (Cass.) Cass. (Asteraceae: Vernonieae) para o estado do Ceará, BrasilCosta, Geovana Catunda Gomes dahttp://repositorio.ufc.br/handle/riufc/869882026-07-03T13:55:23Z2026-01-01T00:00:00ZTítulo: Estudo florístico-taxonômico no gênero Lepidaploa (Cass.) Cass. (Asteraceae: Vernonieae) para o estado do Ceará, Brasil
Autor(es): Costa, Geovana Catunda Gomes da
Abstract: Ceará is the fourth largest state in the Northeast Region of Brazil and presents diverse environmental conditions that influence the composition of its vegetation types. In the state, the family Asteraceae comprises 128 species distributed in 82 genera. Among these, Lepidaploa (Cass.) Cass. stands out, since Ceará is one of the four Brazilian states with the highest number of species of the genus. Given the new occurrences and species of the genus published in recent years, as well as its economic importance, the group demonstrates considerable potential for further investigation. The phylogenetic and morphological proximity to other genera of Asteraceae hampers the recognition of Lepidaploa species, thereby affecting the current knowledge of the taxon. This study aimed to conduct a floristic survey and taxonomic study of Lepidaploa species in the state of Ceará. Technical visits were carried out to the herbaria EAC, HCDAL, HDELTA, and HUVA, and high-resolution online images from the herbaria HVASF and K were examined, in addition to field expeditions conducted between October 2024 and August 2025. Identifications were based on specialized literature, protologues, images of specimens, and type collections. As a result, nine species were recorded for the state, one of which corresponds to a new species to science. Occurrences were mainly associated with areas of dry forests, moist forests, and crystalline Caatinga vegetation in Ceará, with most species associated with higher elevations (700–1300 m). Six species had part of their records within Conservation Units of the state, including five Strictly Protected Areas and two Sustainable Use Areas. An identification key for the species, descriptions, taxonomic comments, photographic plates, and distribution maps are presented here.
Tipo: Dissertação2026-01-01T00:00:00ZFilogeografia e taxonomia de Goyazana castelnaui (H. Milne-Edwards, 1854) (Decapoda: Trichodactylidae) nas bacias dos rios Parnaíba, São Francisco e Tocantins-AraguaiaFreita, Francisco Ronaldo Vieirahttp://repositorio.ufc.br/handle/riufc/865522026-06-01T16:06:21Z2026-01-01T00:00:00ZTítulo: Filogeografia e taxonomia de Goyazana castelnaui (H. Milne-Edwards, 1854) (Decapoda: Trichodactylidae) nas bacias dos rios Parnaíba, São Francisco e Tocantins-Araguaia
Autor(es): Freita, Francisco Ronaldo Vieira
Abstract: The freshwater crab Goyazana castelnaui (H. Milne-Edwards, 1854) has a wide geographic distribution, which may result in significant variability within the species. The objective of this study was to analyze intraspecific variability among populations of G. castelnaui using molecular and morphological tools in the São Francisco, Parnaíba, and Tocantins-Araguaia River basins. Specimens from natural populations were captured manually in the marginal waters of rivers and dams. They were then taken to the LACRUSE laboratory, where they were identified and cataloged. In addition, sequences deposited in the GenBank database from a specimen from the Tocantins/Araguaia basin, as well as from other species of the family Trichodactylidae and the external group, were obtained to support the phylogenetic tree. After identification, the animals were measured, and then the left gonopod of each specimen was removed for morphological analysis. A sample of muscle tissue was also obtained and used for mitochondrial DNA extraction, using the phenol-chloroform method. After DNA extraction, a phylogenetic analysis was performed based on the two mitochondrial genes (16S rRNA and COI). As for the morphological comparison of the gonopods, the data were analyzed using a scanning electron microscope (SEM) and a stereomicroscope. The results demonstrated the existence of phylogenetic divergence in the genes, confirming the presence of three lineages, whereas the morphological analysis of the gonopods revealed a difference between the populations of G. castelnaui from the São Francisco and Parnaíba River basins. These differences suggest that the populations in these basins represent distinct lineages. However, the phylogenetic analysis included all three basins, while the morphological analysis was applied only to the São Francisco and Parnaíba basins.
Tipo: Tese2026-01-01T00:00:00ZSinopse da família Melastomataceae Juss. para o estado do CearáMota, Carlos Adrian Rodrigueshttp://repositorio.ufc.br/handle/riufc/865292026-05-29T03:37:54Z2026-01-01T00:00:00ZTítulo: Sinopse da família Melastomataceae Juss. para o estado do Ceará
Autor(es): Mota, Carlos Adrian Rodrigues
Abstract: Melastomataceae is a monophyletic family comprising 173 genera and approximately 5,850 species, of which 1,523 occur in Brazil and 1,008 are endemic. This study aims to assess the actual species richness and distribution of Melastomataceae in the state of Ceará, based on data obtained from biological collections and field expeditions, through the analysis of herbarium specimens, illustrations, photographs, and type material. A total of 50 species and 14 genera were recorded, including nine new species records and three new genus occurrences for the state. Furthermore, field expeditions enabled the recollection of Aciotis annua in Ceará after more than 180 years without records. This study provides taxonomic comments, identification keys, photographic plates of plants in the field, and maps of geographic distribution.
Tipo: Dissertação2026-01-01T00:00:00ZInterações de micropartículas de TiO2 com os sistemas biológicos Lactuca sativa L., Artemia salina e Danio rerioLima, Ana Kamila Medeiroshttp://repositorio.ufc.br/handle/riufc/865232026-05-28T14:40:46Z2025-01-01T00:00:00ZTítulo: Interações de micropartículas de TiO2 com os sistemas biológicos Lactuca sativa L., Artemia salina e Danio rerio
Autor(es): Lima, Ana Kamila Medeiros
Abstract: Nanostructured materials have revolutionized modern life. Numerous compounds have undergone size reduction processes and have been reintroduced into sectors such as health, cosmetics, food, agriculture, technology, and others. The compound used in this work is titanium dioxide microparticles (TiO2MPs). It is a metal produced on a large scale and used in sunscreen formulations, in food as a colorant, in aquatic depollution strategies, among others. The objective of this work was to characterize the effects of titanium dioxide toxicity on biological systems. The three models chosen were: Lactuca sativa L., Artemia salina, and Danio rerio. Experiments were carried out exposing the models to different concentrations: lettuce to 50 mg.L-1 TiO2MPs, artemia to 12.5, 25, 50, and 100 mg.L-1 TiO2MPs, and zebrafish to 1, 10, and 100 mg.L-1 TiO2MPs. The results were analyzed using conventional optical microscopy, scanning electron microscopy, and transmission electron microscopy. Anatomical and ultrastructural damage confirmed the compound's toxicity to lettuce. In artemia, it caused a high mortality rate in addition to cellular damage at concentrations of 25, 50, and 100 mg.L-1 TiO2MPs. In zebrafish, however, there was no mortality or high rate of deformation. TiO2MPs showed toxicity dependent on concentration, time, and biological model. Even without confirmed absorption, direct contact causes cellular and structural damage in plants and animals. The results highlight the importance of chronic studies under realistic environmental conditions to assess the impact of TiO2MPs on ecosystems and food chains.
Tipo: Tese2025-01-01T00:00:00Z