Dissertations / Theses on the topic 'Dinoflagellates'
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Muftah, Abdulrahman M. A. "Dinoflagellates of Qatari waters." Thesis, Bangor University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303047.
Full textRamírez, Rafael A. "Middle to late eocene dinoflagellate cysts and fungal spores from the east coast of the Maracaibo Lake, Venezuela (biostratigraphy, palaeoecology and taxonomy) /." Tübingen : Universität Tübingen, Geowissenschaftliche Fakultät, 2004. http://w210.ub.uni-tuebingen.de/dbt/volltexte/2004/1438/index.html.
Full textGavelis, Gregory S. "Evolution of complex organelles in dinoflagellates." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/56291.
Full textScience, Faculty of
Zoology, Department of
Graduate
Calado, Sandra Carla Fernandes Craveiro Mendes. "Ultrastructure and phylogeny of peridinioid dinoflagellates." Doctoral thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/972.
Full textOs dinoflagelados são um grupo muito diverso de protistas que possuem um conjunto de características pouco comuns. Os peridinióides são dinoflagelados com teca que é formada por seis séries latitudinais de placas, incluindo a série cingular e um anel incompleto de placas intercalares anteriores, embora as últimas estejam ausentes em algumas espécies de Peridiniopsis. São dinoflagelados com simetria bilateral em relação ao plano apical que contem o eixo dorso-ventral. Na série sulcal há apenas uma placa posterior que contacta com o limite ventral de duas grandes placas antapicais. Entre os peridinióides, a presença ou ausência de um poro apical e o número de placas no cíngulo são geralmente consideradas marcas filogenéticas importantes ao nível de género ou família. Actualmente, a definição de Peridinium Ehrenberg, o dinoflagelado mais comum de água doce, inclui organismos com combinações diferentes destas duas características. Trabalhos anteriores sobre a ultrastrutura e afinidade filogenética das espécies tipo de Peridinium, P. cinctum, e Peridiniopsis Lemmermann, P. borgei também sugerem a necessidade de reexaminar as relações taxonómicas dos peridinióides. Esta tese combina o estudo ultrastrutural de uma selecção de espécies com hipóteses filogenéticas baseadas nas sequências de LSU rDNA, para aumentar o nosso conhecimento das diferenças e afinidades dentro dos peridinióides. Tem como objectivo aumentar o nosso conhecimento das características individuais das células que possam levar a reconhecer sinapomorfias que possam ser usadas como marcadores dos peridinióides como um todo e dos seus subgrupos. As espécies escolhidas para exame pormenorizado foram: Peridinium palatinum Lauterborn, de um grupo com duas placas intercalares anteriores, seis placas cingulares e sem poro apical; Peridinium lomnickii Wo!oszy"ska, de um grupo com poro apical, três placas intercalares e seis cingulares; Peridiniopsis berolinensis (Lemmermann) Bourrelly, uma espécie heterotrófica com poro apical, sem placas intercalares e com seis placas cingulares; e Sphaerodinium cracoviense Wo!oszy"ska, um membro de um género de formas com teca com um tipo de tabulação marginalmente peridinióide, com um suposto poro apical e quatro placas intercalares anteriores. Peridinium palatinum difere de Peridinium e Peridiniopsis típicos, quer em características da teca, quer internas. As diferenças estimadas entre as sequências parciais de LSU rDNA de P. palatinum e a espécie próxima P. pseudolaeve, relativamente a P. cinctum são comparativamente grandes e, juntamente com a topologia da árvore filogenética, apoiam a separação de P. palatinum e formas próximas ao nível de género. Palatinus nov. gen. foi, então, descrito com as novas combinações Palatinus apiculatus nov. comb. (espécie tipo; sin. Peridinium palatinum), P. apiculatus var. laevis nov. comb. e P. pseudolaevis nov. comb.. As características distintivas de Palatinus incluem uma superfície das placas lisa ou um tanto granulosa, mas não areolada, um grande pirenóide central penetrado por canais citoplasmáticos e de onde radiam lobos plastidiais, e a presença de uma fiada microtubular homóloga à de um pedúnculo. As células de Palatinus saem da teca pela zona antapicalpos- cingular. Peridinium lomnickii apresenta tabulação semelhante às formas marinhas, produtoras de quistos calcários, do género Scrippsiella A.R. Loeblich. Para comparação, adicionámos novas observações ultrastruturais de S. trochoidea. Peridinium lomnickii tem uma combinação de características diferente de Peridinium, Peridiniopsis e Scrippsiella. As hipóteses filogenéticas baseadas em DNA colocam P. lomnickii no mesmo ramo que Pfiesteria Steidinger et Burkholder, Tyrannodinium e outras Pfiesteriaceae, com as quais partilha um "microtubular basket" e uma ligação peculiar entre duas placas do sulco. As características distintivas do novo género proposto Chimonodinium gen. ined. incluem, além da tabulação, a ausência de pirenóides, a presença de um "microtubular basket" com quatro ou cinco fiadas sobrepostas de microtúbulos associados a um pequeno pedúnculo, um sistema pusular com tubos pusulares bem definidos ligados aos canais flagelares, e a produção de quistos não calcários. Peridiniopsis berolinensis partilha várias características significativas com Pfiesteria e afins, como um "microtubular basket" com a capacidade de suportar um tubo de alimentação, quimiossensibilidade para encontrar presas apropriadas, o modo de natação junto às presas e a organização geral da célula. Hipóteses filogenéticas com base em LSU rDNA confirmam a afinidade entre P. berolinensis e Pfiesteria bem como a relação mais remota com a espécie tipo de Peridiniopsis, P. borgei. Estas razões justificam a proposta de Tyrannodinium gen. nov., uma nova Pfiesteriaceae que difere de outros membros do grupo por viver em água doce e nos pormenores da tabulação. Sphaerodinium cracoviense revelou a tabulação típica do género Sphaerodinium, que apresenta um número de placas intercalares superiores e pos-cingulares maior que o que é típico em peridinióides: 4 e 6, respectivamente. Observações em SEM mostraram uma estrutura apical diferente da dos peridinióides, e um sulco apical numa das placas fazendo lembrar a área apical de alguns woloszynskióides. Os pormenores do aparelho flagelar e do sistema pusular ligam o Sphaerodinium aos woloszynskióides em geral e ao género Baldinia em particular, mas não aos peridinióides. O volumoso estigma de S. cracoviense revelou ser extraplastidial e de um modelo único, composto por elementos que se encontram em woloszynskióides, mas nunca encontrados anteriormente juntos. A análise filogenética baseada nas sequências parciais de LSU rDNA também sugerem uma maior proximidade de S. cracoviense com os woloszynskióides do que com os peridinióides. Futuras análises pormenorizadas de dinoflagelados peridinióides, em especial entre os do numeroso grupo de espécies com poro apical, serão necessárias para clarificar as suas relações taxonómicas; e a produção de descrições melhoradas das características finas particulares das células serão um requisito para perceber a evolução dos caracteres dos peridinióides por forma a podermos identificar marcadores filogenéticos.
Dinoflagellates are a diverse and widespread group of protists that combine a number of unusual features. Peridinioids are thecate dinoflagellates with six latitudinal series of plates, including the cingular series and the incomplete ring of anterior intercalary plates, although the latter is absent in some species currently classified as Peridiniopsis. They tend to be bilaterally symmetrical in relation to the apical plane containing the dorsiventral axis. In the sulcal series there is only one posterior plate, which contacts with the ventral edge of two large subequal antapical plates. Among peridinioids, the presence or absence of an apical thecal pore and the number of plates in the cingulum are often considered important phylogenetic markers at genus or family level. As currently delimited, Peridinium Ehrenberg, the most widely represented dinoflagellate genus in freshwater, includes organisms with different combinations of these features. Previous studies on the fine-structure and phylogenetic affinites of the type species of Peridinium, P. cinctum, and of Peridiniopsis Lemmermann, P. borgei, likewise suggested the need for reexamination of the taxonomical relationships of peridinioids. This thesis combines the ultrastructural examination of selected species with phylogenetic hypothesis based on partial LSU rDNA sequences to extend our knowledge of variation and affinities within the peridinioid group. It aims to advance our understanding of individual cell features that may lead to the recognition of synapomorphies that may be used as markers for the peridinioid group as a whole and for its subgroups. The species targetted for detailed examination were: Peridinium palatinum Lauterborn, representative of a group with two anterior intercalary plates, six cingular plates and no apical pore complex; Peridinium lomnickii Wo!oszy"ska, of a group with apical pore complex, three anterior intercalary and six cingular plates; Peridiniopsis berolinensis (Lemmermann) Bourrelly, an heterotrophic species with apical pore complex, zero anterior intercalary and six cingular plates; and Sphaerodinium cracoviense Wo!oszy"ska, a member of a genus of thecate forms with a marginally peridinioid type of tabulation, with a putative apical pore complex and four anterior intercalary plates. Peridinium palatinum was found to differ from typical Peridinium and Peridiniopsis in both thecal and internal features. The relatively large estimated differences in the partial LSU rDNA sequences of P. palatinum and its close relative P. pseudolaeve compared to P. cinctum, together with the topology of the molecular tree, supported the separation of P. palatinum and related forms at the generic level. Palatinus nov. gen. was therefore described with the new combinations Palatinus apiculatus nov. comb. (type species; syn. Peridinium palatinum), P. apiculatus var. laevis nov. comb. and P. pseudolaevis nov. comb.. Distinctive characters for Palatinus include a smooth or slighty granulate, but not areolate, plate surface, a large central pyrenoid penetrated by cytoplasmic channels and radiating into chloroplast lobes, and the presence of a peduncle-homologous microtubular strand. Palatinus cells exit the theca through the antapical-postcingular area. Peridinium lomnickii has a similar tabulation to the mostly marine, calcareous cyst producers of the genus Scrippsiella A.R. Loeblich and fine-structural observations on S. trochoidea were added for comparison. Peridinium lomnickii showed a different combination of features from Peridinium, Peridiniopsis and Scrippsiella. Interestingly, the DNA-base phylogenetic hypothesis placed P. lomnickii in the same clade as Pfiesteria Steidinger et Burkholder, Tyrannodinium and other pfiesteriaceans, with which it shares a microtubular basket and a peculiar connection between two plates in the sulcus. Distinctive characters of the proposed new genus Chimonodinium gen. ined., include, in addition to the tabulation, the absence of pyrenoids, the presence of a microtubular basket with four or five overlapping rows of microtubules associated with a small peduncle, a pusular system with well-defined pusular tubes connected to the flagellar canals, and the production of non-calcareous cysts. Peridiniopsis berolinensis shares a number of important features with Pfiesteria and its allies, including a microtubular basket with the capacity of driving and supporting a feeding tube, the ability to follow chemical clues to find suitable prey, the swimming behaviour near the prey and the general organization of the cell. Partial LSU rDNA-based phylogenetic hypotheses strongly confirm the close affinity between P. berolinensis and Pfiesteria and the more remote relationship with the type species of Peridiniopsis, P. borgei. These reasons justify the proposal of Tyrannodinium gen. nov., a new pfiesteriacean that differs from other genera in the group in being a freshwater form and in details of the plate arrangement. Sphaerodinium cravoviense showed the tabulation typical of its genus, which extends beyond normal peridinioid tabulation numbers in the anterior intercalary and in the postcingular series, with 4 and 6 plates, respectively. SEM observations revealed that the apical structure differed from the typical arrangement seen in peridinioids and included a furrow with knob-like protuberances reminiscent of the apical area of the thinly thecate woloszynskioids, which usually possess larger numbers of amphiesmal vesicles. Details of the flagellar apparatus and associated pusular system link Sphaerodinium to the woloszynskioids in general and to Baldinia anauniensis in partidular, rather than to peridinioids. The prominent eyespot found in S. cracoviense was shown by TEM to be extraplastidial and of a unique type, made of two components, each known from some eyespot types found in woloszynskioids, but not previously found together. A closer relationship of S. cracoviense with woloszynskioids than with peridinioids was also suggested by a phylogenetic analysis based on LSU rDNA. Further analyses of peridinioids, particularly within the sizeable group of species with an apical pore complex, is needed before general taxonomic relationships become clear; and improved descriptions of fine-structural features of cells are required to unravel the evolution of particular characters, allowing phenotypic phylogenetic markers to be identified.
Selander, Erik. "Chemical ecology of paralytic shellfish toxin producing dinoflagellates /." Göteborg : Fiskebäckskil : Dept. of Marine Ecology, Göteborg University, Kristineberg ; Kristineberg Marine Research Station, 2007. http://www.loc.gov/catdir/toc/fy0804/2007440828.html.
Full textTakishita, Kiyotaka. "Molecular phylogenetic analyses of nuclear- and plastid- encoded genes from dinoflagellates: Implication for origin of the dinoflagellate plastid." Kyoto University, 2000. http://hdl.handle.net/2433/151594.
Full text0048
新制・課程博士
博士(農学)
甲第8563号
農博第1146号
新制||農||809(附属図書館)
学位論文||H12||N3442(農学部図書室)
UT51-2000-M27
京都大学大学院農学研究科応用生物科学専攻
(主査)教授 内田 有恆, 教授 中原 紘之, 教授 大山 莞爾
学位規則第4条第1項該当
Hill, Ross. "Coral bleaching : photosynthetic impacts on symbiotic dinoflagellates /." Electronic version, 2008. http://hdl.handle.net/2100/526.
Full textGlobal climate change is leading to the rise of ocean temperatures and is triggering mass coral bleaching events on reefs around the world. This involves the expulsion of the symbiotic dinoflagellate algae, known as zooxanthellae, from the coral host. Coral bleaching is believed to occur as a result of damage to the photosynthetic apparatus of these symbionts, although the specific site of initial impact is yet to be conclusively resolved. This thesis examined a number of sites within the light reactions of photosynthesis and evaluated the efficiency of photoprotective heat dissipating pathways. Upon expulsion, the capacity for long-term survivorship of expelled zooxanthellae in the water column was also assessed. A reduction in photosystem II (PSII) photochemical efficiency during exposure to elevated temperature and high light (bleaching conditions) was found to be highly dependent upon the increase in abundance of QB non-reducing PSII centres (inactive PSII centres), indicating damage to the site of the secondary electron acceptor, QB, resulting in a limited capacity for its reduction. Therefore, this reduced the rate of the reoxidation of the primary electron acceptor, QA-. Fast induction curve (FIC) analysis of the rise from minimum fluorescence to maximum fluorescence revealed a lower amplitude in the J step along this curve, which was consistent with a reduction in the rate of QA reoxidation. This photoinhibition of PSII was found to occur once the effectiveness of excess energy dissipation through energy-dependent quenching and state-transition quenching was exceeded, suggesting that these mechanisms were incapable of preventing photodamage. Antenna size heterogeneity showed little change under bleaching conditions with a significant increase in PSIIbeta only apparent in one species of coral. The thermostability of the oxygen evolving complex (OEC) and thylakoid membrane were found to increase during exposure to bleaching conditions and exceeded bleaching thresholds of corals. This rapid rise in temperature-dependent thermostability also occurred over seasons, where variation in ocean temperatures was matched by gradual shifts in OEC and thylakoid membrane thermotolerance. Variation in thermostability between species was not found to be linked to zooxanthellae genotype, and instead was related to the bleaching susceptibility of the host. Despite this capacity for resilience to bleaching conditions, the PSII reaction centres did not exhibit such a mechanism for rapid acclimatisation. Corals can only be as tolerant to bleaching conditions as their most sensitive component allows. The formation of nonfunctional PSII centres is therefore suggested to be involved in the initial photochemical damage to zooxanthellae which leads to a bleaching response. Zooxanthellae were found to be expelled irrespective of OEC function and thylakoid membrane integrity, as these sites of the photosynthetic apparatus were still intact when cells were collected from the water column. Although zooxanthellae were photosynthetically competent and morphologically intact upon expulsion, their longevity in the water column was dependent on the time of expulsion following the onset of bleaching and the ambient water temperatures. The survivorship of these zooxanthellae was restricted to a maximum of 5 days in the water column which suggests that unless expelled zooxanthellae inhabit other environs of coral reefs which may be more favourable for survival, their capacity for persistence in the environment is extremely limited. Chlorophyll a fluorescence measurements are a common tool for investigating photosynthetic impacts to in hospite zooxanthellae of corals. Pathways causing dark-reduction of the plastoquinone pool are shown to be active in corals and affect measurements which require dark-adaptation. Pre-exposure to far-red light was found to be an effective procedure to oxidise the inter-system electron transport chain and ensure determination of the true maximum quantum yield of PSII and accurate FICs. It is concluded that the trigger for coral bleaching lies in the photosynthetic apparatus of zooxanthellae and evidence is presented in support of this impact site not being the OEC or thylakoid membrane.
Caruana, A. "DMS and DMSP production by marine dinoflagellates." Thesis, University of East Anglia, 2010. https://ueaeprints.uea.ac.uk/25594/.
Full textDixon, G. K. "The inorganic nitrogen metabolism of marine dinoflagellates." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636452.
Full textRobison, Jennifer D. "The photophysiology of symbiotic dinoflagellates (Symbiodinium) under varying light and thermal conditions and the implications for coral bleaching." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 8.14 Mb., 97 p, 2006. http://proquest.umi.com/pqdlink?did=1163244091&Fmt=7&clientId=8331&RQT=309&VName=PQD.
Full textJenks, Andrée. "The dinoflagellate chloroplast : immunolocalization of two unique plastid proteins." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0005/MQ44191.pdf.
Full textNascimento, Silvia Mattos. "Phytoplankton blooms and water quality of the Fleet lagoon, Dorset, UK, including studies of isolated toxic strains of Alexandrium minutum and Prorocentrum lima." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289670.
Full textMak, Ka Man. "Topoisomerases II in the cell cycle of dinoflagellates /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?BIOL%202005%20MAK.
Full textDrainville-Higgins, Katherine Evelyn. "Isolation of marine metabolites from S̲y̲m̲b̲i̲o̲d̲i̲n̲i̲u̲m̲ species of dinoflagellates /." View online ; access limited to URI, 2004. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3135901.
Full textHo, Percy. "S-adenosylmethionine synthetase in the dinoflagellate crypthecodinium cohnii (biecheler) /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?BIOL%202006%20HO.
Full textValiadi, Martha. "Bioluminescence in dinoflagellates : diversity, molecular phylogeny and field ecology." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/209735/.
Full textHandy, Sara Marie. "Investigations of the ecology of Delaware Inland Bay harmful algae utilizing quantitative real-time PCR." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 152 p, 2007. http://proquest.umi.com/pqdweb?did=1362527691&sid=13&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textXiang, Yu Santos Scott R. "Host specificity and regional endemicity in symbiotic dinoflagellates (Symbiodinium, Dinophyta) associated with sea anemones in the genus Aiptasia." Auburn, Ala, 2009. http://hdl.handle.net/10415/1627.
Full textJohn, E. H. "Growth dynamics and physiology of paralytic shellfish toxin producing dinoflagellates." Thesis, Swansea University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637432.
Full textLuerssen, Remy Martin. "Relationships between Oceanographic Satellite Data and Alexandrium Distributions in the Gulf of Maine." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/LuerssenRM2001.pdf.
Full text蒋析文 and Xiwen Jiang. "Proteomics analysis of toxins-producing dinoflagellates and toxins-contaminated marine organisms." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hdl.handle.net/10722/193073.
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Biological Sciences
Doctoral
Doctor of Philosophy
Lewis, Jane Mary. "The ecology and taxonomy of marine dinoflagellates in Scottish sea lochs." Thesis, Royal Holloway, University of London, 1985. http://repository.royalholloway.ac.uk/items/4a0ad27d-b2b7-44fd-9e97-8f9623ba4bd1/1/.
Full textKelly, Joann. "The effect of nutrient limitation on the growth and toxicity of the dinoflagellate Gyrodinium instriatum." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-3/kellyj/joannkelly.pdf.
Full textChiu, Ellen. "Proteomic and physiological studies of paralytic shellfish toxin producing dinoflagellates Alexandrium tamarense and Gymnodinium catenatum /." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38827761.
Full textVazhappilly, Rema. "Effects of environmental factors and desaturase inhibitors on the formation of docosahexaenoic acid by Crypthecodinium cohnii strainsunder heterotrophic growth condition." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31239389.
Full textJoyce, Linda Britt. "An investigation into the occurrences of harmful algal blooms in Scapa Flow, Orkney." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/1137.
Full textVazhappilly, Rema. "Effects of environmental factors and desaturase inhibitors on the formation of docosahexaenoic acid by Crypthecodinium cohnii strains under heterotrophic growth condition /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20566876.
Full textUrrutia, Figueroa Victor Emanuel. "The relationship between corals and their symbiotic dinoflagellates : environment and host control." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/425509/.
Full textCawley, Jon Clayton. "Dynamic systems analysis of fossil dinoflagellates from the Atlantic Coastal Plain, USA." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-09182008-063023/.
Full textJuranovic, Lillian Regina 1962. "Determination of the toxic/mutagenic potential of toxins associated with ciguatera dinoflagellates." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277164.
Full textWiggan, Nickolas James. "Palynological insights into the Mid Jurassic dinoflagellate radiation." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/269278.
Full textLiew, Yi Jin. "Small RNA studies in Drosophila melanogaster, Stylophora pistillata and Symbiodinium sp." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/268035.
Full text蕭嘉裕 and Ka Yu Gavin Siu. "An investigation of a toxic red tide dinoflagellate alexandrium catenella: physiology, occurrence andtoxicity." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31235293.
Full textSavage, Anne Margaret. "Genetic diversity and photosynthetic characteristics of zooxanthellae (Symbiodinium)." Thesis, University of York, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369298.
Full textHamre, Kathleen Diamond. "Responses of Boom-Forming Phytoplankton Populations to Changes in Reservoir Chemistry and Physics." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/74869.
Full textMaster of Science
Small, Hamish J. "Infections of the Norway lobster, Nephrops norvegicus (L.) by dinoflagellate and ciliate parasites." Thesis, Connect to e-thesis, 2004. http://theses.gla.ac.uk/624/.
Full textPh.D. thesis submitted to the Division of Environmental and Evolutionary Biology, Institute of Biomedical and Life Sciences, University of Glasgow, 2004. Includes bibliographical references. Print version also available.
Chiu, Ellen, and 招雅莉. "Proteomic and physiological studies of paralytic shellfish toxin producing dinoflagellates: Alexandriumtamarense and Gymnodinium catenatum." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38827761.
Full textWeary, David J. "Dinoflagellate paleoecology and biostratigraphy of the Middle Eocene Tallahatta and Lisbon Formations from the Baldwin County, Alabama, Core." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/51909.
Full textMaster of Science
Moustafa, Ahmed. "Evolutionary and functional genomics of photosynthetic eukaryotes." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/311.
Full textLovko, Vincent J. "Pathogenicity of the purportedly toxic dinoflagellates Pfiesteria piscicida and Pseudopfiesteria shumwayae and related species." W&M ScholarWorks, 2008. https://scholarworks.wm.edu/etd/1539616752.
Full textReñé, Vicente Albert. "The diversity of dinoflagellates belonging to the gymnodiniales from the catalan coast (NW Mediterranean Sea)." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/145038.
Full textLes dinoflagel•lades són un dels grups més abundants i diversos de microalgues. Moltes espècies estan cobertes amb plaques de cel•lulosa, mentre que d’altres que no en tenen són conegudes com a atecades o nues. Les espècies atecades han estat generalment mal caracteritzades ja que es deformen quan són fixades amb mètodes tradicionals. La majoria de gèneres atecats s'inclouen dins l’ordre Gymnodinials i es distingeixen per caràcters morfològics, però la combinació recent d'observacions morfològiques amb dades filogenètiques conclou que les filogènies moleculars no suporten els criteris morfològics clàssics utilitzats per distingir els gèneres. També es coneix que l’ordre Gymnodinials no és monofilètic. Per tant, la correcta taxonomia de dinoflagel•lades requereix una combinació d’informació morfològica i molecular. L'ús generalitzat de tècniques moleculars ha permès estudis detallats sobre la sistemàtica de molts grups. Tot i que moltes dinoflagel•lades no són fàcilment cultivables i no es poden seqüenciar mitjançant tècniques estàndards, la tècnica de single-cell PCR ha permès obtenir seqüències a partir d'una sola cèl•lula, aprofitant el gran nombre de còpies dels gens ribosòmics que les dinoflagel•lades contenen. Entre els anys 1960 i 1980 es van dur a terme identificacions extensives de les dinoflagel•lades existents al litoral català. Tanmateix, no es va caracteritzar adequadament la diversitat de dinoflagel•lades atecades degut a l’ús de mostres fixades i la manca d'eines moleculars. Aquesta memòria presenta l'estudi de la diversitat d'espècies de l’ordre Gymnodinials a la costa catalana com a representativa del NO del Mar Mediterrani, entre els anys 2010-2013. L'estudi presenta una revisió de la seva taxonomia pel que s'han combinant estudis morfològics d’exemplars vius amb la corresponent informació filogenètica. Atès que la filogènia d’alguns dels organismes estudiats no s'havia determinat amb anterioritat i l'evidència que l’ordre Gymnodinials no és monofilètic, el segon objectiu ha estat estudiar les relacions filogenètiques de les espècies. Es va seleccionar la regió D1-D2 del 28s rDNA per dur a terme els anàlisis amb SC-PCR, però també es van obtenir seqüències del 18s rDNA quan ha estat necessari. La combinació de les dades morfològiques i moleculars ha permès la identificació inequívoca de 58 espècies atecades pertanyents a l’ordre Gymnodinials. D’aquestes, es detecten deu morfoespècies per primera vegada a la mar Mediterrània, i vuit per primera vegada al litoral català (Capítols 1 i 2). A més, l'aplicació de la SC-PCR ha permès seqüenciar 43 espècies atecades, 25 de les quals per primera vegada (Capítols 1 i 2). També ha permès la detecció i caracterització d’espècies no descrites prèviament, que ha resultat en la descripció de les noves espècies Gymnodinium litoralis (Capítol 3) i Polykrikos tanit (Capítol 4). A més, es va detectar per primera vegada l'espècie tòxica Cochlodinium polykrikoides al litoral català. La majoria d’aquests organismes pertanyien a un nou ribotip, però d’altres quedaren inclosos en un ribotip ja conegut, demostrant la seva coexistència al Mar Mediterrani (Capítol 5). Finalment, es va seqüenciar per primera vegada un espècimen del gènere Ceratoperidinium i es va obtenir un nou grup filogenètic, juntament amb d’altres dinoflagel•lades atecades, incloent Ceratoperidinium margalefii, Gyrodinium falcatum, que va ser transferit al gènere Ceratoperidinium, tres espècies de Cochlodinium, i dos organismes semblants a Gymnodinium. Això va donar lloc a l'esmena de la família Ceratoperidiniaceae i del gènere Ceratoperidinum (Capítol 6). La correcta identificació de les espècies ha permès concloure que la costa catalana presenta una gran diversitat de dinoflagel•lades atecades, i discutir les implicacions en la distribució i biogeografia de les espècies a nivell de la Mediterrània, com el cas de C. polykrikoides (Capítol 5), o global, com el cas de Gyrodinium spirale (Capítol 2)
Cembella, Allan Douglas. "Variability and species discrimination within the Protogonyaulax tamarensis/catenells species complex : toxic red-tide dinoflagellates." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/27039.
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Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Sanchez, Puerta Maria Virginia. "Genomic studies of the evolution of haptophytes and dinoflagellates with emphasis on the chromalveolate hypothesis." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3708.
Full textThesis research directed by: Cell Biology & Molecular Genetics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Burleson, Cheska. "Production of Bioactive Secondary Metabolites by Florida Harmful Bloom Dinoflagellates Karenia brevis and Pyrodinium bahamense." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/3998.
Full textFranklin, D. J. "Cell death in free-living and endosymbiotic and dinosymbiotic dinoflagellates in response to environmental stress." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268998.
Full textPaterson, Ruth Flora. "Investigating the distribution, seasonal dynamics and toxicity of Azadinium spinosum in Scottish waters using qPCR." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=237753.
Full textHo, Yam Tat. "The roles of bacteria in the production of paralytic shellfish toxins in two dinoflagellate cultures /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?BIOL%202003%20HO.
Full textIncludes bibliographical references (leaves 118-130). Also available in electronic version. Access restricted to campus users.
Susek, Ewa Justyna. "Environmental factors influencing cyst formation and preservation of organic-walled dinoflagellates an environmental and laboratory study /." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979702496.
Full textGribble, Kristin Elizabeth. "The ecology, life history, and phylogeny of the marine thecate heterotrophic dinoflagellates Protoperidinium and Diplopsalidaceae (Dinophyceae)." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/39221.
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Marine thecate heterotrophic dinoflagellates likely play an important role in the consumption of primary productivity and in the trophic structure of the plankton, yet we know little about these species. This thesis expanded our understanding of the autecology and evolutionary history of the Protoperidinium and diplopsalids. The distributions of Protoperidinium species off the southwestern coast of Ireland were influenced by physical oceanographic conditions coupled with the availability of preferred prey. The distributions of individual Protoperidinium species varied widely from the distribution of total Protoperidinium, indicating differences in ecologies among species. Certain species of Protoperidinium co-occurred with known preferred phytoplankton prey species. Concentrations of other Protoperidinium species were not related to those of any particular phytoplankton species, indicating that these Protoperidinium may rely on phytoplankton or other food sources beyond those already known, may not be species specific selective feeders, or may have become uncoupled from their preferred prey. The description of the sexual and asexual life history of Protoperidinium steidingerae provided the first account of the life history of any Protoperidinium species.
(cont.) Asexual division occurred by eleutheroschisis within a temporary, immotile cyst, yielding two daughter cells. Daughter cells were initially round and half to two-thirds the size of parent cells, then rapidly increased in size, forming horns before separating. Sexual reproduction was constitutive in clonal cultures, indicating that the species may be homothallic. Fusing gametes were isogamous, and resulted in a planozygote with two longitudinal flagella. Hypnozygotes had a mandatory dormancy period of ca. 70 days. Germination resulted in planomeiocytes with two longitudinal flagella. Nuclear cyclosis may occur in the planomeiocyte stage. A high level of morphological diversity among life history stages of P. steidingerae has led to mis-classification and taxonomic inaccuracy of Protoperidinium species identified from field samples. The large subunit ribosomal DNA (LSU rDNA) molecular phylogeny of the heterotrophic dinoflagellates revealed that the genus Protoperidinium appeared to be recently diverged within the dinoflagellates. In maximum parsimony and neighbor joining analysis, Protoperidinium formed a monophyletic group, evolving from diplopsalid dinoflagellates.
(cont.) In maximum likelihood and Bayesian analyses, however, Protoperidinium was polyphyletic, as the lenticular, diplopsalid heterotroph, Diplopsalis lenticula Bergh, was inserted within the Protoperidinium clade basal to Protoperidinium excentricum (Paulsen) Balech, and Preperidinium meunieri (Pavillard) Elbrichter fell within a separate clade as a sister to the Oceanica section and Protoperidinium steidingerae Balech. In all analyses, the Protoperidinium were divided into two major clades, with members in the Oceanica group and subgenus Testeria in one clade, and the Excentrica, Conica, Pellucida, Pyriforme, and Divergens sections in another clade. The LSU rDNA molecular phylogeny supported the historical morphologically determined sections, but not a simple morphology-based model of evolution based on thecal plate shape. LSU rDNA gene sequences are frequently used to infer the phylogeny of organisms. The many copies of the LSU rDNA found in the genome are thought to be kept homogenous by concerted evolution. In Protoperidinium species, however, there was high intragenomic diversity in the D1-D6 region of the LSU rDNA. For each species, the clone library was usually comprised of one highly represented copy and many unique sequences.
(cont.) Sequence differences were primarily characterized by single base pair substitutions, single base pair insertion/deletions (indels), and/or large indels. Phylogenetic analysis of all clones gave strong support for monophyly of the polymorphic copies of each species, and recovered the same species tree as an analysis using just one sequence per species. Analysis of LSU rDNA gene expression in three species by RT-PCR indicated that copies with fewer substitutions and fewer and smaller indels are expressed, and that 50% or more of the copies are pseudogenes. High intraspecific and intraindividual LSU rDNA sequence variability could lead to inaccurate species phylogenies and over-estimation of species diversity in environmental sequencing studies. This thesis has explored the ecology, life history, molecular phylogeny, and intraspecific DNA sequence variability of marine thecate heterotrohic dinoflagellates using a wide range of methodologies, including field sampling, culturing, microscopy, morphological analyses, histological staining, and molecular biology. The work here has broadened our understanding of the Protoperidinium and diplopsalids, providing new insights into the ecological and evolutionary relationships of these heterotrophs with other plankton species.
by Kristin Elizabeth Gribble.
Ph.D.
Paxinos, Rosemary, and paxinos rosemary@saugov sa gov au. "Dynamics of phytoplankton in relation to tuna fish farms in Boston Bay and near-shore Spencer Gulf, South Australia." Flinders University. Biological Sciences, 2007. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20081022.144704.
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