Thesis (M.S.)--Rutgers University, 2008. / "Graduate Program in Ecology and Evolution." Includes bibliographical references (p. 78-82).

Thesis--University of Lund. / Extra t.p. with thesis statement inserted. Bibliography: p. 9.

Thesis (Ph. D.)--University of British Columbia, 1999. / Includes bibliographical references (leaves 146-164).

Thesis (M.Arch.)--University of Hong Kong, 1994. / Includes special study report entitled : Aquarium, laboratory and floating structure. Includes bibliographical references. Also available in print.

<p>Common species of freshwater mussels may, like the freshwater pearl mussel (<em>Margaritifera margaritifera</em>) have a drastic decline in number and there is several reasons, like sedimentation, a decline of host fishes, introduction of alien species, nutrition leakages from agriculture and pollutants of medic drugs and poison. Ann Gustavsson made in the year of 2007 a study over rejuventation of freshwater great mussels in nine watersystems and considered that the rejuventation within the populations were all along the line poor. This study orients from her work and points to determine if there is a connection between the poor juventation and pollution of nitrogen and phosphorous from industries and private sanitations. The study was performed with the software program ArcGIS9.2 to take out drainage areas for the concerned habitats and contact was made with the concerned authoritys. When it comes to supervision of private sanitations is it the countys and for industries is it the county administrative board. Most of the countys had a very difficult way to reach their data of the private sanitations and those who had data had great holes in their knowledge in them. The greatest emission of nitrogen was without doubt the industries, but a more even allocation could be seen in the pollution of phosphourus, where the industries and the private sanitations stood for about fifty- fifty of the pollution. The greatest emission of nitrogen and phosphourus happened in Viskan, in the drainage area for Lekvad,there it was a lack of mussels. The species of <em>Anodonta anatina </em>showed a strong positive correlation between emission of nitrogen and phosphourus with the way of juvenile mussels in the population. More studies is need to do in these areas, both when it comes to continuing mapping of rejuventation within the freshwater great mussels in several waters and template value for pollution of nitrogen and phosphourus, that is very doubtful today. Even studies concerning other factors, like predation, host fishes and the influence of poison and medic drugs is needing to do, as it is few studies concerning this today.</p>

Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (p. 217-248).

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Submitted by Caroline Falcao (caroline.rfalcao@ufpe.br) on 2017-05-22T17:18:22Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação.pdf_Diego Lira dos Anjos.pdf: 2042388 bytes, checksum: 0eaa06622a1c9f131bff88e150e338ab (MD5) / Made available in DSpace on 2017-05-22T17:18:23Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação.pdf_Diego Lira dos Anjos.pdf: 2042388 bytes, checksum: 0eaa06622a1c9f131bff88e150e338ab (MD5) Previous issue date: 2012-05-31 / A presente pesquisa teve como objetivo efetuar uma análise espaço-temporal da estrutura da comunidade fitoplanctônica, biomassa e parâmetros hidrológicos no estuário do rio Capibaribe (Recife, Pernambuco, Brasil). As coletas foram realizadas em três pontos fixos durante o período de estiagem (outubro, novembro e dezembro de 2010) e chuvoso (maio, junho e julho de 2011) abrangendo dois ciclos de marés (baixa- mar e preamar). As amostras de microfitoplâncton foram coletadas com auxílio de uma rede de plâncton com abertura de malha de 64μm. Os dados de pluviometria foram fornecidos pelo Instituto Nacional de Meteorologia - 3° Distrito de Meteorologia (INMET - 3° DISME), provenientes da Estação Meteorológica. Foram aferidos in situ dados sobre as variáveis abióticas: profundidade local, temperatura e transparência da água; concomitantemente, foram coletadas amostras de água, com garrafa oceanográfica do tipo Kitahara, para análise da salinidade e clorofila a. Foram identificados 96 táxons, distribuídos entre os filos Ochrophyta (61,46%), Chlorophyta (12,50%), Cianobacteria (11,46%), Myzozoa (7,29%), Euglenozoa (4,17%) e Charophyta (3,12%), sequenciados em ordem de riqueza taxonômica e abundância, destacando-se como dominantes: as cianobactérias Oscillatoria sp e Planktothrix sp; e as ochrophytas (diatomáceas) Aulacoseira granulata, Cyclotella glomerata, Cyclotella sp, Cylindrotheca closterium, Helicotheca thamesis, Skeletonema costatum e Thalassiosira sp. A biomassa fitoplanctônica variou de 0,66 a 52,69mg.m-3 , com média geral de 13,46mg.m-3 e juntamente com a salinidade, temperatura e transparência da água apresentaram maiores valores no período de estiagem. Foram registrados valores de salinidade, temperatura e transparência da água mais elevados nas preamares e biomassa fitoplanctônica nas baixa-mares. Os resultados obtidos indicam uma variação sazonal bem definida da biomassa fitoplanctônica e composição florística do microfitoplâncton, influenciada pelo efeito sinergético dos parâmetros climatológicos e hidrológicos, notadamente com relação à penetração da luz solar no ambiente. Conclui-se que, a região estuarina do rio Capibaribe é um ambiente eutrófico, e que o ciclo de maré foi o fator determinante na variação da biomassa fitoplanctônica e composição do microfitoplâncton. / This study aimed to perform an analysis of the spatio-temporal structure of phytoplankton, biomass and hydrological data in the estuary of the river Capibaribe (Recife, Pernambuco, Brazil). Samples were collected at three fixed points during the dry season (october, november and december 2010) and rainy (may, june and july 2011) covering two tidal cycles (low tide and high tide). Microphytoplankton samples were collected with the aid of plankton net with mesh size of 64μm. The rainfall data were provided by the National Institute of Meteorology - 3° District of Meteorology (INMET - 3° DISME) from the meteorological station of Recife and located in the neighborhood of the Várzea. Were measured in situ data on abiotic variables: local depth, temperature and water clarity, concomitantly, water samples were collected with Kitahara bottle oceanographic type for analysis of salinity and chlorophyll a. Phytoplankton presented 96 taxa, distributed among phyla Ochrophyta (61,46%), Chlorophyta (12,50%), cyanobacteria (11,46%), Myzozoa (7,29%), Euglenozoa (4,17%) and Charophyta (3,12%), sequenced in order of abundance and taxonomic richness, standing out as dominant: the cyanobacteria Oscillatoria sp and Planktothrix sp; and ochrophytas (diatoms) Aulacoseira granulata, Cyclotella glomerata, Cyclotella sp, Cylindrotheca closterium, Helicotheca thamesis, Skeletonema costatum and Thalassiosira sp. Phytoplankton biomass ranged from 0,66 to 52,69mg.m-3 , with overall average of 13,46mg.m-3 and with the salinity, temperature and water transparency showed higher values in the dry season. Recorded values of salinity, temperature and water transparency in higher high tides and phytoplankton biomass in the low tides. The results indicate a clear seasonal variation of phytoplankton biomass and floristic composition of microphytoplankton, influenced by the synergistic effect of climatological and hydrological parameters, especially with respect to the penetration of sunlight in the environment. Concluded that, the estuary of the river Capibaribe is a eutrophic environment, and the tide was the determining factor in the variation of phytoplankton biomass and composition of microphytoplankton.

The SELECT model (Frost, 1982) is analyzed, criticized, and extended to embrace new information about the feeding behaviour of copepods and the structure of the planktonic food web in a series of alternative models. Diel variations in photosynthesis, grazing, and predation on copepods (temporal structure) and patchiness of zooplankton and their predators (spatial structure) are modelled in other variants. It is observed that the vertical, temporal, and (horizontal) spatial structure of the planktonic ecosystem are important components of ecosystem models that can not safely be ignored. It is further observed that a convincing mechanism for the termination of diatom blooms is lacking and should be a subject of intensive research, and that the status of chlorophyll-containing microflagellates as phototrophs is questionable and should be reconsidered. / Science, Faculty of / Zoology, Department of / Graduate

This thesis presents a quantitative model of interactions among phytoplankton, nutrients, bacteria and grazers in an enclosed marine ecosystem. The enclosed system was a 23 m deep, 9.6 m diameter column of surface water in Saanich Inlet, British Columbia. Dynamics of large- and small-celled diatoms and flagellates in response to observed irradiance and zooplankton numbers and observed or simulated nitrogen and silicon concentrations were modelled over a simulated 76-day period between July 12 and September 26. The model's predictions poorly matched the observed events in Controlled Experimental Ecosystem 2 (CEE2), but nevertheless provided some important insights into system behavior. Ciliate grazing probably prevented small-celled phytoplankton from increasing to large concentrations in CEE2. By virtue of their tremendous numbers, colourless flagellates were potentially the most important grazers on bacteria, much more important than larvaceans or metazoan larvae. Whereas small-celled phytoplankton were limited by grazers, large phytoplankton dynamics were not markedly affected by grazing. The average observed rate of 14C fixation in the surface 8 m was roughly consistent with an interpretation in which artificial additions of nitrogen contributed 62% of inferred net uptake of nitrogen by phytoplankton, mixing from subsurface water contributed 18%, bacterial remineralization 12%, and zooplankton excretion 9%. However, independent observations of rapid activity by microheterotrophs (presumably bacteria) suggested that 1*C fixation considerably underestimated net primary production. This yielded an alternative interpretation in which nutrient additions contributed 46% of inferred net uptake of nitrogen in the surface layer, mixing 13%, bacteria 35%, and zooplankton 7%. Dissolution of silica was responsible for the observed accumulation of silicic acid below 8 m depth in CEE2, but the importance of silica dissolution as a source of Si for diatom growth in the surface 8 m is uncertain. The model's major failing was its assumption of unchanging maximum growth rates of phytoplankton, and unchanging rates of exudation, sinking, and respiration. Physiological parameter values which accounted for the huge bloom of Stephanopyxis in CEE2 could not account for the ensuing collapse. Traditional modelling assumptions of slowly changing internal physiology, although adequate for marine systems dominated by physical factors such as seasonality or water movement, cannot capture the behavior of biologically dominated systems like the enclosed system considered here. / Science, Faculty of / Zoology, Department of / Graduate