TCC - Licenciatura em Ciências Biológicas (Sede)
URI permanente para esta coleçãohttps://arandu.ufrpe.br/handle/123456789/445
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Resultados da Pesquisa
Item Microplásticos do plâncton na porção norte da APA Costa dos Corais (Tamandaré, Brasil)(2019-12-13) Ferreira, Lucas Xavier; Melo Júnior, Mauro de; http://lattes.cnpq.br/6735233221650148; http://lattes.cnpq.br/7507756194543034Microplastics are particles smaller than 5 mm and can be broadly classified as: filamentous, hard fragments and soft fragments. These particles are among the main current solid contaminants in the marine environment. Such fragments can be released into the environment in different ways, such as degradation itself through biotic or abiotic factors. After being degraded, these particles can be suspended in the water column, thus being able to be ingested by organisms, especially filters at the base of the food chain. The work aims to characterize the plankton microplastics in the waters that bathe the northern portion of the Costa dos Corais Environmental Protection Area, in Tamandaré (PE), aiming at the evaluation of three planktonic compartments in the area (estuarine plume, in the reefs and in the bay ). Samples from 4 campaigns carried out between Sep / 2017 and Mar / 2018 were analyzed, aiming to sample periods with different rainfall regimes, always at low water (to better establish the influence of estuarine plumes). The analyzed microplastics were quantified and classified according to type. To confirm the visually screened microplastics, tests were performed with nitric acid (HNO3). The results show that there is a higher incidence of filamentous microplastics (12 ± 13 mp / m³), compared to other types. The presence of filamentous microplastics reached an average density of 16.08 ± 16.22 mp m³ in the plume, in the dry period, and in the rainy period it had an average of 21.62 ± 20.77 mp m³ in the reefs. . The densities of filamentous microplastics were significantly different between points (plume, bay and reefs). In each period, even with this variation between the points, the data indicate that there was a variation between the points, but if compared to other studies, the variation is not significant, although the bay has shown variation in relation to the other areas. In the present study, the seasonal period did not have a significant influence on the increase in the presence of microplastics in the studied points, even though microplastics are common in estuarine systems in several parts of the world, the fact that there were no seasonal differences in the studied points ( it was expected that during the rains the occurrence of microplastics would be higher) due to the insertion of the Ilhetas and Mamucabas estuaries in a protected region (APA Guadalupe and ReBio de Saltinho).Item Plâncton e microplásticos flutuantes dos recifes de Serrambi (Ipojuca, PE), durante um ciclo circadiano(2018-08-15) Silva, Josefa Luana de Aguiar; Melo Júnior, Mauro de; http://lattes.cnpq.br/6735233221650148; http://lattes.cnpq.br/0782368445581490Reef plankton is of vital importance to marine ecosystems as it represents the basis of the pelagic food web in the oceans, and changes in its composition and structure can cause profound changes at all trophic levels. This study aimed to understand the dynamics of the plankton community and the floating microplásticos of the Serrambi beach reefs located in Ipojuca, south coast of Pernambuco, and whether there is influence of a circadian cycle on the structure of these important plots of the pelagic system. The sampling campaign was carried out during a complete circadian cycle in a rainy season, corresponding to the following moments: (i) daytime ebb tide; (ii) nocturnal ebb tide; (iii) daytime flood tide; and (iv) night flood tide. Samples were collected from horizontal trawls and near the reefs, using plankton nets of 20 μm (phytoplankton) and 65 μm (zooplankton). For the microplastics, the samples of this last plot were considered. The phytoplankton groups observed were cyanobacteria, diatoms and dinoflagellates. The values of the phytoplankton density were very different in the four collection times, varying between 123.82 and 1783.02 cells / L, with numerical predominance of diatoms (93.5%). As for zooplankton, the variation in the occurrence of the zooplankton groups was relatively low on all four occasions; however, the density found was very high during daytime (38943.4 ind. m-3) and nocturnal (38460.4 ind. . m-3), with emphasis on copepods (65.92%). Considering microplastics, (i) yarns and lint were found, (ii) hard fragments and (iii) soft fragments of microplastics, all of secondary origin of different colors and sizes, demonstrating several possible sources. The values of the microplastic densities during the circadian cycle are very similar, ranging from 5.19 microns. m-3 (night flood) and 17.69 microns. m-3 (nocturnal ebb), demonstrating also to respond to tidal variation. These results demonstrate how tidal variations occurring along a circadian cycle may have a strong influence on the structure and dynamics of plankton and microplastics. In addition, it is possible to infer that the main environmental variable along the circadian cycle to act on these elements is the tidal variation, with potential influence on the upper trophic links and dependent on seston particles.