TEDE Coleção:https://tedebc.ufma.br/jspui/handle/tede/tede/20582024-03-28T16:53:45Z2024-03-28T16:53:45ZCirculação hidrodinâmica e transporte de sedimentos no estuário do rio Parnaíba, PIBORGES, Kassandra Kelenhttps://tedebc.ufma.br/jspui/handle/tede/tede/51992024-03-19T16:03:21Z2023-03-01T00:00:00ZTítulo: Circulação hidrodinâmica e transporte de sedimentos no estuário do rio Parnaíba, PI
Autor: BORGES, Kassandra Kelen
Primeiro orientador: DIAS, Francisco Jose da Silva
Abstract: Estuaries are among the most productive and hydrologically dynamic
coastal ecosystems along the continent-ocean interface, due to river discharges,
precipitation effect, tidal variation and wind action. The pattern of circulation and
mixing in estuarine environments is fundamental for controlling the distribution and
transport of materials. This work aimed to characterize the hydrodynamic circulation
and the transport of bottom and suspended sediments in the estuary of the Parnaíba
River, PI, during the rainy, transition and dry periods in the year 2018. For data
acquisition, 8 (eight) were determined. transversal sections to the flow and 8 (eight)
hydrographic stations. Temperature, conductivity and depth parameters were
measured using a CTD/Exo2 and an ADCP was used to acquire continent-ocean
interaction data. Suspension Particulate Matter (SPM) concentrations were
obtained by gravimetry and a Gibbs dredge was used to collect sediments. The
granulometric analysis was carried out by the sieving method and treated in the R
Software. And later, the samples were analyzed in the Pejrup Diagram. The
variation of the thermohaline structure in the rainy period indicated intense fluvial
input, while in the transition and dry periods there was a greater influence of sea
water. Variations in MPS concentration between the studied periods indicated
higher values in the rainy season due to the high river input and lower values in the
transition and dry periods, due to the greater influence of marine water in the
estuarine system. The arrangement of the TS pairs indicated the presence of two
distinct water masses, one of continental origin, characterized by high temperature
(T ≥ 30°C) and low salinity (S ≤ 5 g.kg-1
) and another resulting from the mixing with
coastal water. In the analyzes of the continent - ocean interactions, the Transport
volume (Tv), Percentage of Fresh Water (PAD) and Time of Residence (Tr),
indicated an intense flow due to the fluvial input in the rainy season, already in the
seasonal periods following the saline intrusion was predominant in the estuarine
system. But in general, the results indicated that the greater the percentage of fresh
water, the greater the residual time, depending on the influence of the tide in the
region. As for the granulometric analyzes of the bottom sediments, the Medium
Sand class was predominant in the rainy season and Fine Sand in the transition and
dry periods. The Pejrup Diagram classified the Parnaíba river estuary as an
environment of high hydrodynamics and Sand percentages ranging from 90 - 100%
and through the net balance of flows, the Parnaíba river estuary was classified as
an importer.
Instituição: Universidade Federal do Maranhão
Tipo do documento: Dissertação2023-03-01T00:00:00ZModelagem metabólica da cianobactéria Geminocystis sp. GBBB08, isolada no Parque Nacional da Chapada das Mesas, MaranhãoRIBEIRO, Igor Santanahttps://tedebc.ufma.br/jspui/handle/tede/tede/48162023-07-10T16:48:21Z2022-10-31T00:00:00ZTítulo: Modelagem metabólica da cianobactéria Geminocystis sp. GBBB08, isolada no Parque Nacional da Chapada das Mesas, Maranhão
Autor: RIBEIRO, Igor Santana
Primeiro orientador: DALL'AGNOL, Leonardo Texeira
Abstract: Bioinformatics tools for predictive analysis of omic data have grown exponentially
together with the advancement of new sequencing and computing technologies. Genomic
scale models are effective tools for metabolic engineering and investigation of metabolic
networks. However, these reconstructions can demand a lot of time for broader approaches,
and their quality depends on the set of biochemical and phenotypic characteristics to be
evaluated, in addition to the available data on the group under study. In this work, we used the
integration of genome mining analysis (antiSMASH and MIBiG) for the discovery of
biosynthetic natural products combined with genomic-scale metabolic reconstruction tools
(CarveMe) of the genome of the cyanobacterium Geminocystis sp. GBBB08. Comparative
analyzes led to the in silico reproduction of the Terpene (Non-Melavonate) production
pathway with the flow balance analysis providing metabolic characteristics for the
biosynthesis of the terpenoids involved. In addition, biosynthetic gene clusters of
anabaenopeptin and heptadecene were identified. In general, the genome of Geminocystis sp.
GBBB08 provides important data on the metabolic potential of the genus with an in silico
approach to a frequent and economically relevant metabolic pathway such as terpenoids.
Comparative analyzes in a genomic mining approach and systems biology can favor the
reconstruction of metabolic networks and lead to a better understanding of metabolism and its
biotechnological potential.
Instituição: Universidade Federal do Maranhão
Tipo do documento: Dissertação2022-10-31T00:00:00ZCorrentes e massas de água no complexo estuarino de São Marcos e plataforma continental adjacenteCARVALHO, Kerlem Luina Vinhashttps://tedebc.ufma.br/jspui/handle/tede/tede/46862023-05-15T13:16:45Z2023-02-27T00:00:00ZTítulo: Correntes e massas de água no complexo estuarino de São Marcos e plataforma continental adjacente
Autor: CARVALHO, Kerlem Luina Vinhas
Primeiro orientador: DIAS, Francisco José da Silva
Abstract: This study aimed to characterize the temporal variation of circulation and water masses in the São Marcos Estuarine Complex (SMEC) and adjacent Continental Shelf (PC), in different rainfall periods. Data were acquired throughout along the anchorages were carried out during the dry season of 2020 and the rainy season of 2021, under spring tide conditions. Current velocity measurement was obtained with the aid of a 500 MHz frequency sensor ADCP (Sontek/YSI) and state variables and mass field was obtained using a CTD (EXO2 / YSI) as a stand-alone unit. The results obtained from the circulation showed that the regions presented bidirectional flow and with dominance of ebb currents, intense currents of up to 2 m s-1 in the estuarine anchorages attributed to the SMEC funneling and the reduction in the CP velocities attributed to its width. Temperatures ranged from 27.5 to 30.7 ºC and salinities ranged from 18.3 to 36.6 g kg -1 The analysis of thermohaline indices suggests the presence of three water masses: during the dry season an Estuarine Water (AE) and Coastal Water (AC) and during the rain a Front Water (AF) in addition to AE and AC. For the transport of salt, the estuarine anchorages presented themselves as salt exporting regions, while the CP anchorages presented themselves as salt importers. The Richardson layer number indicated behaviors of moderate to high stability in the water column possibly associated with tidal currents, and through the stratification-circulation diagram the regions were characterized as type 1a (well mixed and weakly stratified) and 2a (partially mixed and with weak vertical stratification). The study considered that the sampling carried out represents another step in the understanding of estuarine systems and the changes that occurred in the drainage basin.
Instituição: Universidade Federal do Maranhão
Tipo do documento: Dissertação2023-02-27T00:00:00ZCOMUNIDADE MICROZOOPLANCTÔNICA DE UM ESTUÁRIO TROPICAL DOMINADO POR RIO – PARQUE NACIONAL DOS LENÇÓIS MARANHENSESSANTOS, Taiza Pimentelhttps://tedebc.ufma.br/jspui/handle/tede/tede/44822023-01-16T19:41:58Z2022-12-20T00:00:00ZTítulo: COMUNIDADE MICROZOOPLANCTÔNICA DE UM ESTUÁRIO TROPICAL DOMINADO POR RIO – PARQUE NACIONAL DOS LENÇÓIS MARANHENSES
Autor: SANTOS, Taiza Pimentel
Primeiro orientador: CUTRIM, Marco Valério Jansen
Abstract: Studies of zooplankton distribution patterns and diversity associated with environmental
environmental heterogeneity are important for understanding the basic structure and function of
coastal ecosystems. The study emphasized the importance of environmental filters in the dynamics
microzooplankton community and the ecological relationships established with
phytoplankton in three zones in the tropical mesomare estuary. The microzooplankton recorded
a total of 89 species, belonging to 14 phyla, with Arthropoda being the most representative
(72.21%), followed by the Ciliphora and Mollusca. The class Copepoda stands out, with the species
Paracalanus crassiostris, Pseudodiaptomus gracilis and Oithona nana dominating the
the community. From the total, 21 species were selected as indicators, highlighting
Temora turbinata in the coastal zone (CZ), Rhizodomus tagatzi in the mixing zone (MZ) and
Bosminopsis deitersi in the river zone (ZR). The environmental heterogeneity showed
significant spatial differences, with variations governed mainly by the gradient of salinity
temperature and pH, which acted as the main environmental filters. The species
species of ZC and ZM showed direct ecological relationships with the diatom blooms
Skeletonema costatum and Asterionellopsis glacialis, which favored the abundance of microzooplankton
was favored by their occurrence, denoting a top-down control of the trophic web.
trophic network. When the partitioning of beta diversity, the turnover component
was responsible for the high diversity, due to the environmental heterogeneity, which distinguished
communities between zones. The MZ acted as a dispersive center, with 58% of its
species migrating between all zones, thus defining it as an area that requires
greater protection of biodiversity.
Instituição: Universidade Federal do Maranhão
Tipo do documento: Dissertação2022-12-20T00:00:00Z