Thesis (Ph. D.)--University of California, San Diego, 1998. / Vita. Includes bibliographical references.

No description available.

Dissertação(mestrado) - Universidade Federal do Rio Grande, Programa de Pós–Graduação em Oceanografia Biológica, Instituto de Oceanografia, 2011 / Submitted by Cristiane Gomides (cristiane_gomides@hotmail.com) on 2013-12-16T03:06:44Z No. of bitstreams: 1 Priscila da Fonseca Teixeira.pdf: 335923 bytes, checksum: 69841da63959745c00a7a0e8b7859194 (MD5) / Approved for entry into archive by Sabrina Andrade (sabrinabeatriz@ibest.com.br) on 2013-12-18T18:10:59Z (GMT) No. of bitstreams: 1 Priscila da Fonseca Teixeira.pdf: 335923 bytes, checksum: 69841da63959745c00a7a0e8b7859194 (MD5) / Made available in DSpace on 2013-12-18T18:10:59Z (GMT). No. of bitstreams: 1 Priscila da Fonseca Teixeira.pdf: 335923 bytes, checksum: 69841da63959745c00a7a0e8b7859194 (MD5) Previous issue date: 2011 / Na aqüicultura, o sistema sem trocas de água é eficiente e sustentável, permite manejar o balanço entre carbono e nitrogênio, e o desenvolvimento de microorganismos que contribuem na boa qualidade da água, alimentação e sobrevivência do organismo alvo do cultivo. No presente estudo, a composição e densidade de fitoplâncton e protozooplâncton em conjunto com variáveis físico-químicas foram avaliados em viveiros de cultivo de camarão Litopenaeus vannamei (Boone) em sistema sem troca de água em dois tratamentos, com e sem a adição de melaço como fertilizante de carbono. As amostras de água foram coletadas por um período de 70 dias (janeiro a abril de 2009) e os tratamentos apresentaram diferença significativa para o teor dos nutrientes fosfato, silicato e clorofila <20 μm. A clorofila foi dominada pela fração <20μm (>80%) nos dois tratamentos e alcançou os maiores valores (~400 μg L-1) no final do experimento. No viveiro com melaço houve um maior crescimento de cianobactérias filamentosas (Pseudoanabaena spp. e Spirulina sp.), de diatomáceas especialmente Pleurosigma sp. e de ciliados, além da presença de Oxyrrhis marina Dujardin e de Anabaena sp.. No viveiro sem melaço os flagelados e dinoflagelados, especialmente Protoperidinium sp. e outros da ordem Peridiniales foram mais freqüentes e abundantes. Em ambos os tratamentos foi observada uma alta densidade de cianobactérias cocóides e de dinoflagelados (Gymnodiniales e Gyrodinium sp.). Apesar de não terem sido encontradas diferenças estatísticas entre os tratamentos, ficaram claras tendências distintas de composição e densidade do fitoplâncton e protozooplâncton entre os viveiros, indicando a influência da adição de melaço. / In aquaculture the zero water exchange system is efficient, sustainable, and allows the management to balance the carbon and nitrogen compounds through the development of microorganisms contributing to good water quality, feeding and survival of the target organism. In this study, the composition and density phytoplankton and protozooplâncton together with physical and chemical variables were evaluated in shrimp ponds (Litopenaeus vannamei Boone) without water exchange in two treatments with and without the addition of molasses as carbon fertilizer. Water samples were collected during 70 days (January- April 2009). The treatments differed significantly in dissolved inorganic phosphate, silicate and chlorophyll <20 μm. Chlorophyll, dominated by the fraction <20 μm (> 80%), reached the highest values (~400 μg L-1) at the end of the experiment in both treatments. In the pond with molasses, the filamentous cyanobacteria (Pseudoanabaena spp., Spirulina sp.), the diatom Pleurosigma sp. and ciliates reached highest density and the dinoflagellate Oxyrrhis marina Dujardin and the cyanobacteria Anabaena sp. were present. In the pond without molasses, flagellates, and dinoflagellates Protoperidinium sp. and other Peridiniales were more frequent and abundant. In both treatments coccoid cyanobacteria and dinoflagellates (Gyrodinium sp. and other Gymnodiniales) were abundant. Although the differences were not statistically significant, the composition and abundance of phytoplankton and protozooplankton differed over time in both treatments, indicating the influence of the molasses addition.

Viable cysts collected from natural sediments were induced to excyst. Ten cyst-theca relationships, first established elsewhere, were confirmed for British Columbia (B.C.). These were: Gonyaulax tamarensis, Protoperidinium aspidotum, P. claudicans, P. conicoides, P. conicum, P. cf. denticulatum, P. leonis, P. oblongum, and P. punctulatum. Five cyst-theca relationships were established for the first time: Peridiniopsis cf. hainanensis, Protoperidinium sp. nov., P. thorianum, and two apparently new species of Gonyaulax. P. pentagonum was found to have a cyst different from the cyst of this species in the Atlantic. Forty-five samples from Recent sediments were collected along the coast of B.C. Twenty-three of the samples had very few cysts. Hidden Basin was the chief source of viable cysts for the excystment experiments. Ten cyst-based taxa were described from the sediment samples. These were: Operculodinium centrocarpum, the cyst of Scrippsiella faeroense (= Micrhystridium bifurcatum), Spiniferites belerius, S. bentori, S. bulloideus, S. elongatus, S. membranaceus, S. nodosum, and S. ramosus. Tanyosphaeridium sp. has been recorded previously as the cyst of Polykrikos schwarzi. Two new cyst-based taxa are described for the first time. These are a cyst of Protoperidinium sp., and Spiniferites "sp. A". Cyst assemblages in the Recent sediments of B.C. were similar to many temperate estuarine and neritic areas. Some cysts which are characteristic of these areas in other regions, have not yet been found in B.C. The relative importance of some cysts also varies from that found in similar sediments elsewhere. The dominance of Operculodinium centrocarpum in many of the cyst assemblages, including B.C., is a pattern typical of temperate estuarine conditions. Some cysts appear to be characteristically associated with fjord environments. Scrippsiella faeroense, for example, has been found in Norwegian fjords and Scottish sea lochs as well as some B.C. fjords and inlets. / Science, Faculty of / Botany, Department of / Zoology, Department of / Graduate

This study documents the vertical and lateral distribution of organic-walled phytoplankton cyst assemblages from samples taken from the Demopolis-Ripley transition interval, a pelagic carbonate to marine clastic facies transition in the Upper Cretaceous Selma Group of Mississippi and Alabama. The study samples have yielded abundant and diverse assemblages of dinoflagellate, chlorophyte, and acritarch cysts. In all, 70 species of organic-walled phytoplankton cysts are treated. On the basis of the ranges of the dinoflagellate cyst species recovered from the present study samples, the Demopolis-Ripley transition interval in the study sections is correlated with the lower Maastrichtian of western Europe. Also, on the basis of the data from the present study and other unpublished dinoflagellate cyst data, the Campanian-Maastrichtian boundary in the Selma Group is shown to lie at some point within the middle one-half of the Demopolis Chalk. The application of computer-based gradient analysis programs to a Recent dinoflagellate cyst dataset from the continental shelf of South Africa has shown that gradient analysis of organic-walled phytoplankton cyst assemblages can be useful in the recognition of patterns of marine watermass distribution. Finally, the application of gradient analysis techniques, including cluster analysis, polar ordination, mean rank abundance (MBA) analysis, and average member similarity (AMS) analysis, to the Demopolis-Ripley organic-walled phytoplankton cyst assemblages has allowed the recognition of four paleoecological significant phytoplankton cyst associations. The stratigraphic distributions of these associations correspond well to the changing distributions of watermass characteristics which are likely to have accompanied the Denopolis-Ripley facies transition. / Master of Science

Diverse, well preserved organic-walled phytoplankton assemblages were recovered from the Tertiary section of the Oak Grove core drilled on the Virginia Coastal Plain. Strata penetrated include the Aquia, Marlboro Clay, and Nanjemoy Formations (Paleocene to Eocene) of the Pamunkey Group and the Calvert and Choptank Formations (Miocene) of the Chesapeake Group. The assemblages are composed of 176 dinoflagellate species and subspecies (82 genera), of which 20 species and subspecies and one combination are new; five acritarch species (two genera) and five chlorophyte species (three genera) are also reported. The biostratigraphic distribution of the 186 species provides information concerning the ages of the formations and the nature of their lithologic contacts. The organic-walled phytoplankton assemblages corroborate the Paleocene (Thanetian) age indicated by the calcareous nannofossils, Foraminifera, ostracodes, and pollen and spores for the Aquia strata; certain dinoflagellate and pollen species in the lowermost 11.5 m (37.9 ft), however, suggest this basal interval, devoid of other microfossils, could be Paleocene (Danian) in age. An Eocene (Ypresian) age is assigned to the Nanjemoy strata based on the organic-walled phytoplankton, as well as the pollen and spores, calcareous nannofossils, ostracodes, and mollusks. The intervening Marlboro Clay appears to straddle the Paleocene-Eocene boundary based on its dinoflagellate and pollen species. Dinoflagellate species suggest a general Early to Middle Miocene age for the Calvert and Choptank section in the core; diatom samples in the Calvert indicate a late Early to early Middle Miocene age and in the Choptank a middle Middle Miocene age. Lithologic and biostratigraphic evidence suggests the upper and possibly the lower Marlboro Clay contacts represent minor disconformities, in addition to the major disconformity at the Nanjemoy-Calvert boundary; the Calvert-Choptank contact appears conformable. The ten provisional dinoflagellate zones proposed for the Aquia, Marlboro Clay, and Nanjemoy strata of the core permit correlation with other previously studied Paleocene and Eocene sections of the Virginia and Maryland Coastal Plain. These Lower Tertiary strata are also generally biostratigraphically correlated with numerous coeval European sections, and a composite offshore eastern Canada section. The dinoflagellate, acritarch, and chlorophyte assemblages are statistically analyzed for paleoenvironmental implications using species diversity indicators (richness, Shannon-Wiener index, evenness) and analyses patterned after previous palynological studies suggesting correlation of various assemblage parameters and characteristics with particular depositional environments. Results are consistent with sedimentological and foraminiferal-based paleoenvironmental assessments of generally inner shelf marine settings for the Aquia, Nanjemoy, Calvert, and Choptank Formations, and a lagoonal or estuarine setting for the Marlboro Clay. Cluster, principal coordinates, and rank-abundance analyses help to objectively define and characterize six major and 12 smaller clusters of samples related by their species associations through time. / Ph. D.

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

Thesis (M.S.)--University of North Carolina Wilmington, 2008. / Title from PDF title page (October 20, 2008) Includes bibliographical references (p. 40-47)

Thesis (M.S.)--University of North Carolina Wilmington, 2008. / Includes appendixes. Title from PDF title page (viewed May 27, 2009) Includes bibliographical references (p. 96-102)

Thesis (M. Sc.)--University of Hong Kong, 1994. / Includes bibliographical references (leaves 48-52).