http://hdl.handle.net/11422/25 2026-04-14T04:48:37Z 2026-04-14T04:48:37Z Espírito Santo, Alessandra do http://hdl.handle.net/11422/3997 2023-12-21T03:06:50Z 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 Bressan, Fernanda Affonseca http://hdl.handle.net/11422/3500 2023-12-21T03:03:27Z 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 Souza, Catharina Alves de http://hdl.handle.net/11422/3494 2023-12-21T03:00:49Z 2002-02-01T00:00:00Z

Title: Taxonomia e aspectos biogeográficos da flora planctônica de um sistema costeiro salobro - Lagoa Carapebus, município de Carapebus, RJ Author(s)/Inventor(s): Souza, Catharina Alves de Advisor: Menezes, Mariângela Abstract: A taxonomical and biogeographical survey of planktonic flora from Carapebus lagoon (22°50'S e 41º35'W), a brackish coastal system located in the northern Rio de Janeiro State belonging, in part, to Parque Nacional da Restinga de Jurubatiba werc presented. This is a shallow and oligohaline lagoon with dark and slightly alcaline waters. Taxonomical study was based on 145 samples collected by a plankton net and by passing a ílask along water subsurfce at fur stations in February, March, July and October 1996 (Period I), April, August and September 1997 (Period II), and at monthly intervals from May 2000 to April 2001 (Period III). Altogether 1 84 táxons were identified distributed into Chlorophyceae (23%), Cyanophyceae (18%), Euglenophyceae (17%), Bacillariophyceae (11%), Zygnematophyceae (8%), Coscinodicophyceae (5%), Xanthophyceae (4%), Cryptophyceae (4%), Dinophyceae (3%), Chrysophyceae (4%), Prasinophyceae (2%), Charophyceae (1%) e Ulvophyceae (1%). Nineteen species and four genera were new records fr Brazil. Forty-fve and 70 generic and infrageneric taxa were registered for the frst time fr Rio de Janeiro State and fr Brazilian brackish coastal lagoons, respectively. Seventeen taxa could not be identifed at specifc levei and probably almost them must be new to the Science. Concernig the salinity the populations from Carapebus lagoon werc, in general, represented by typical eurihaline limnobiont organisms (76%), fllowed by typical organisms fom brackish waters (10%) and eurihaline marine (3%). From a geographical point of view, of the total infrageneric taxa in Carapebus lagoon, 43% have a cosmopolitan distribution, 13% are widely distributed, 1 9% show scarce distribution and 4% have a temperate/arctic occurrence. Only 11% of the taxa present restricted distribution in tropics. Descriptions, illustrations, infrmations on geographical distribution by the world and in Brazil, and 1 2 indented keys fr the identifcation of all taxa presently registered were given. Taxonomical comments including phenotypic plasticity of the populations identifed as well as the similarity based on the floristic composition registered in quantitative analysis between Carapebus lagoon and three more brackish systems located in the southeastern and southern part of Brazil were discussed. Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2002-02-01T00:00:00Z Santos, Viviane Severiano dos http://hdl.handle.net/11422/3458 2023-12-21T03:05:40Z 2002-01-01T00:00:00Z

Title: Nano- e microfitoplâncton da Baía de Guanabara (RJ, Brasil) em condições tróficas distintas: aspectos estruturais e pré-funcionais Author(s)/Inventor(s): Santos, Viviane Severiano dos Advisor: Villac, Maria Célia Abstract: Presents the space-time variations for the nano- and microphytoplankton of Guanabara Bay, Rio de Janeiro, Brazil, focussing on the structure (composition and abundance) and pre-functional (auto and heterotrophic components, biomass) aspects of the community. Sampling strategy included intensive sampling (weekly) for two and a half years (July/1998 - December/2000), at 0.5 m, at two sites with different water qualities: Urca (close to the entrance) e Ramos (inner-reaches). The abundance of the phytoplankton was one order of magnitude higher at Ramos, where cell density of autotrophs varied around 10^7 - 10^9 cells. L^-1 for the nanoplankton and 10^5 - 10^7 cells. L^-1 for the microplankton, while biomass values varied around 10^2 - 10^3 μgC. L^-1 and 10 - 10^3 μgC. L^-1, respectively. At Urca, lower relative and absolute abundances of heterotrophs were also found. The species list for the microphytoplankton included 168 taxa for Urca and 69 for Ramos; diatoms were the best-represented species, followed by dinoflagellates. For the nanophytoplankton, it was identified just some groups (diatoms, dinoflagellates, cryptophytes and cyanobacteria) due to methodology of analysis (just epifluorescence). Median diversity of microphytoplankton was 2.43 bits.ceff^-1 at Urca and 1.68 bits.celr^-1 at Ramos. Trophic state (meso-eutrophic for Urca and hypertrophic for Ramos) and salinity (lower at Ramos) were identified as the main forcings determining the space variation found for the phytoplankton. Seasonal variations were associated to a rainny summer (dominance of diatoms and cyanobacteria) and a dryer winter (increase on the contribution of flagellates). The stronger seasonal variation found for Ramos was attributed to the greater influence of direct river flow to this area. Interannual variations coincided with the occurrence of "La Niña" years (1998 and 1999) when seasonal variations were different from those considered as the pattern for Guanabara Bay. Weekly variations were detected, especially for dinoflagellates and euglenophytes from the innerreaches of the bay, the area under stronger environmental stress. Estimates of total biomass from cell biovolume showed that the contribution of the microphytoplankton was equivalent and, at time, even greater than that of the nanoplankton, in contrast to what was indicated by the cell density data. Moreover, the heterotrophic componentes of nanoplankton were less abundant in terms of biomass, while the opposite occurred for microplankton ones. Biomass in terms of carbon, while still providing a sinoptic scenario of the community, was very important to determine the true contribution of each fraction (nano:microphytoplankton) and of each component (auto:heterotrophs), which were key to support the trophic states determined for Guanabara Bay. Publisher: Universidade Federal do Rio de Janeiro Type: Dissertação

2002-01-01T00:00:00Z