http://hdl.handle.net/11422/25 2026-07-30T04:48:57Z 2026-07-30T04:48:57Z http://hdl.handle.net/11422/29842 2026-07-30T03:00:10Z 2025-03-11T00:00:00Z

Title: Sistemática e filogenia do gênero Centroceras Kützing (Ceramiaceae, Rhodophyta) Author(s)/Inventor(s): Menegale, Alda Carolina Lambone Advisor: Barros Barreto, Maria Beatriz Barbosa de Abstract: The genus Centroceras comprises filamentous marine red algae with complete cortication of the thallus, originating from periaxial cells, which consistently divide into two acropetal and one basipetal cells. Although morphological characteristics are traditionally employed to differentiate its species, the overlapping of these traits hampers accurate delimitation within the genus. This identification challenge has led to the adoption of phylogenetic techniques, which have revealed cryptic diversity within the group. Furthermore, the genus has undergone significant nomenclatural changes, particularly following the introduction of molecular biology. The first taxonomic revision of the genus Centroceras in the post-DNA era of macroalgal taxonomy revealed that Centroceras clavulatum (Agardh) Montagne is not a single species, but rather a species complex. Currently, the genus includes 18 species, several of which have been recently recognized. This study aimed to revise and analyze the systematics of the genus Centroceras using phylogenetic tools to refine the group’s taxonomic classification. Novel sequences were generated and analyzed for the Brazilian coast, in addition to data retrieved from GenBank, using two molecular markers: rbcL and COI-5P. The results indicated a need for taxonomic reorganization within the genus Centroceras. A key finding was the identification of the C. gasparrinii (Meneghini) Kützing complex, which possibly encompasses five distinct species, and the reinstatement of C. macracanthum Kützing for the Brazilian coast. Additionally, the distribution of C. gasparrinii was confirmed in both the Mediterranean Sea and the Sea of Japan. Molecular analyses also led to the identification of a new species from the Brazilian coast, occurring in two specific locations in Bahia and Rio de Janeiro. Furthermore, the results reinforced that morphology alone does not meet the criteria required for accurate species recognition within this genus. Morphological approaches may result in species underreporting, hinder the discovery of new taxa, and lead to nomenclatural misassignments. Based on molecular data, 16 species are currently recognized at the molecular level. When morphologically based species are included, the total number reaches 23. This revision excludes the occurrence of C. micracanthum sensu Won, Cho & Fredericq and C. gasparrinii from the Brazilian marine flora, as previously suggested by other studies. The study concludes that the integration of molecular data and phylogenetic methods, coupled with careful nomenclatural revision, allows for a more precise delimitation of Centroceras species, revealing a complex diversity and providing a more robust and up-to-date nomenclatural reorganization for the genus. In summary, this study significantly contributes to the understanding of the diversity and phylogeny of the genus Centroceras, highlighting the importance of molecular data in taxonomy and offering clearer insights into species distribution and identification, including the detection of novel species and the implementation of necessary nomenclatural adjustments. Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2025-03-11T00:00:00Z http://hdl.handle.net/11422/29794 2026-07-26T03:00:12Z 2025-08-01T00:00:00Z

Title: Memórias, circulação de plantas e africanos escravizados na obra Historia Naturalis Brasiliae (1648) Author(s)/Inventor(s): Jerônimo, Jéssica de Andrade Advisor: Medeiros, Maria Franco Trindade Abstract: The slave trade during Brazilian colonization promoted the forced migration of thousands of Africans to be enslaved, which likely led to necessary socio-environmental adaptations for the survival of this population, as well as the circulation of knowledge and plants during this period. The Historia Naturalis Brasiliae, a work by Pies and Marggraf published in 1648, during the period of Dutch colonization in northeastern Brazil, contains descriptions that allow access to the “subterranean memories” of enslaved Africans regarding knowledge of the flora, as well as the “circulation” of species and associated knowledge. The objective was to reveal the “subterranean memories” about plants and their “circulation” among different agents and spaces in the construction of the scientific knowledge of the naturalists Pies and Marggraf, in association with enslaved Africans in the 17th century. To obtain the data a reading of the translated versions from 1942 and 1948 was conducted, and to verify the information, the original 1648 edition was consulted. The “subterranean memories” linked to plants were categorized in terms of direct and indirect association with enslaved Africans. For the identification of taxonomic clues, Pickel (2008) and Alcantara-Rodriguez et al. (2019) were used as auxiliary resources. The usage typologies described for the plants were organized into four categories: food, construction, medicinal, and technological. The frequency of citations was calculated for the plant part used and the method of preparation for consumption within the most significant usage category. Terms directly associated with enslaved Africans were more frequent, totaling 22 popular names associated with five terms, the most expressive of which was “Negros” (n=11; 46%). A total of 24 taxonomic clues and 37 popular names related to enslaved Africans were identified. The food use category was the most relevant (n= 13 citations; 68.4%). Highlighting the circulation of plants between Africa and Brazil, in Pies’ descriptions, Manihot esculenta Crantz. was the most versatile in this category (n=4 uses); and in Marggraf’s descriptions, Dioscorea alata L. was the only one with more than one food use (n=2). The part of the plant with the highest indication of consumption was the “root” (n=5; 38.5%), and the “cooked” preparation for consumption (n=3; 23.1%). Conditions of food and health insecurity among the enslaved population would be indicative of this circulation of knowledge related to plant species in their adaptation processes for survival under new socio-environmental conditions. It is understood that access to memory regarding the relationship of the invisible and oppressed with plant species deepens scientific knowledge about local biodiversity. Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2025-08-01T00:00:00Z http://hdl.handle.net/11422/3997 2026-05-16T03:06:11Z 1998-01-01T00:00:00Z

Title: Anatomia foliar comparada entre indivíduos de sol e de sombra de Saranthe eichleri Petersen (Marantaceae) em dois ambientes distintos na Mata Atlântica Author(s)/Inventor(s): Espírito Santo, Alessandra do Advisor: Costa, Cecília Gonçalves Abstract: This work deals with the morphologic and anatomic aspects of the leaf of specimens of Saranthe eichleri Petersen (Marantaceae) growing at the different degrees of luminosity in the Forest Preserve of the Tijuca and the Rio das Pedras Ecological Reserve. Both habitats are inserted in parts of the secondary forest, pertains to the mountaineer context of the Atlantic Rain Forest, State of Rio de Janeiro and differs in the forest successional stages and pluviometric regime. The presence of the hypodermis, of the "oblique-cells" in the pulvinus and the air-lacunae that extend pratically for all levels of the leaf, are characteristics of the family. The differences in the sun and shade individuals are related to: the frequency of the stomata per mm2; the number of the hypodermis layer at junction of lamina and midrib and apex; the number of the layer as well as thickness of the chlorenchyma and hypodermis in the lamina; the presence of gelatinous fibers on the specimens shaded of Forest Preserve of the Tijuca; the number of air-lacunae in the midrib and the characteristc at the margin in the material from two habitats. Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

1998-01-01T00:00:00Z http://hdl.handle.net/11422/3500 2026-05-16T03:03:57Z 2001-07-01T00:00:00Z

Title: Fatores reguladores da dominância de Cylindrospermopsis raciborskii (Woloszynska) Seenayya & Subba-Raju no Reservatório Tabocas, Caruaru, PE Author(s)/Inventor(s): Bressan, Fernanda Affonseca Advisor: Huszar, Vera Lúcia de Moraes Abstract: ln 1996, during haemodialysis procedure using water from Tabocas reservoir in Caruaru, Pernambuco, a massive human intoxication associated with cyanotoxins was registered. After that, a detailed monitoring program was established, including phytoplankton ecology studies. Since cyanophytes were the dominant algal group and considering their potential relevance to public health, the goals of this study were to recognise temporal and spatial patterns of distribution of these populations, mainly Cylindrospermopsis raciborskii (Woloszynska) Seenaya & Subba-Raju , and to understand the main regulating factors of its dominance. Phytoplankton and abiotic variables of water were sampled during November 1997 to October 1998, at subsurface, biweekly in three sampling stations. A vertical profile was analysed only in the station near to the dam. Considering phytoplankton composition and biomass, three periods were recognised: period I, with lower biomass and C. raciborskii dominance; period II, with similar biomass to period 1, but co-dominance of C. raciborskii and Cyanodictyon imperfectum Cronberg & Weibull; period III, with the highest biomass and dominance of C. raciborskii. Total biomass was inversely related to reservoir level and to the light. Our data support that C. raciborskii dominance was favoured by high temperature, high pH, low light and low inorganic dissolved phosphorus concentrations. Environmental constancy, defined by the persistent and strong drought, was a decisive factor to promote the long-standing cyanophytes dominance in Tabocas reservoir. According to the phytossociological approach originally developed to terrestrial vegetation and recently applied to phytoplankton, groups of species can be efficient descriptors of the environment where they live. The most representative algal assemblages in Tabocas Resevoir was S and Sn, both fitted to growth in low phosphorus concentrations and low light. Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2001-07-01T00:00:00Z