Dissertations / Theses on the topic 'Plankton'
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Striebel, Maren. "PLANKTON DYNAMICS." Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-92597.
Full textDel, Giorgio Paul A. "Heterotrophy in lake plankton." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41362.
Full textBirch, Daniel A. "Plankton modeling at multiple scales." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3274810.
Full textTitle from first page of PDF file (viewed October 9, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 132-138).
Kotrc, Benjamin. "Evolution of Silica Biomineralizing Plankton." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10969.
Full textEarth and Planetary Sciences
Mantilla, Jose G. (Jose Gabriel) 1972. "Models of plankton biomass spectra." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80212.
Full textMartin, Mark A. "The influence of seasonal and climatic environmental changes on plankton in the marine mixed layer /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/6788.
Full textKramer, Kurt A. "Identifying plankton from grayscale silhouette images." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001402.
Full textPitchford, Jonathan William. "Dynamics of multi-species plankton populations." Thesis, University of Leeds, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397772.
Full textPascual-Dunlap, Maria Mercedes. "Some nonlinear problems in plankton ecology." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/38049.
Full textMatuszewski, Damian Janusz. "Computer vision for continuous plankton monitoring." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-24042014-150825/.
Full textMicroorganismos planctônicos constituem a base da cadeia alimentar marinha e desempenham um grande papel na redução do dióxido de carbono na atmosfera. Além disso, são muito sensíveis a alterações ambientais e permitem perceber (e potencialmente neutralizar) as mesmas mais rapidamente do que em qualquer outro meio. Como tal, não só influenciam a indústria da pesca, mas também são frequentemente utilizados para analisar as mudanças nas zonas costeiras exploradas e a influência destas interferências no ambiente e clima locais. Como consequência, existe uma forte necessidade de desenvolver sistemas altamente eficientes, que permitam observar comunidades planctônicas em grandes escalas de tempo e volume. Isso nos fornece uma melhor compreensão do papel do plâncton no clima global, bem como ajuda a manter o equilíbrio do frágil meio ambiente. Os sensores utilizados normalmente fornecem grandes quantidades de dados que devem ser processados de forma eficiente sem a necessidade do trabalho manual intensivo de especialistas. Um novo sistema de monitoramento de plâncton em grandes volumes é apresentado. Foi desenvolvido e otimizado para o monitoramento contínuo de plâncton; no entanto, pode ser aplicado como uma ferramenta versátil para a análise de fluídos em movimento ou em qualquer aplicação que visa detectar e identificar movimento em fluxo unidirecional. O sistema proposto é composto de três estágios: aquisição de dados, detecção de alvos e suas identificações. O equipamento óptico é utilizado para gravar imagens de pequenas particulas imersas no fluxo de água. A detecção de alvos é realizada pelo método baseado no Ritmo Visual, que acelera significativamente o tempo de processamento e permite um maior fluxo de volume. O método proposto detecta, conta e mede organismos presentes na passagem do fluxo de água em frente ao sensor da câmera. Além disso, o software desenvolvido permite salvar imagens segmentadas de plâncton, que não só reduz consideravelmente o espaço de armazenamento necessário, mas também constitui a entrada para a sua identificação automática. Para garantir o desempenho máximo de até 720 MB/s, o algoritmo foi implementado utilizando CUDA para GPGPU. O método foi testado em um grande conjunto de dados e comparado com a abordagem alternativa de quadro-a-quadro. As imagens obtidas foram utilizadas para construir um classificador que é aplicado na identificação automática de organismos em experimentos de análise de plâncton. Por este motivo desenvolveu-se um software para extração de características. Diversos subconjuntos das 55 características foram testados através de modelos de aprendizagem disponíveis. A melhor exatidão de aproximadamente 92% foi obtida através da máquina de vetores de suporte. Este resultado é comparável à identificação manual média realizada por especialistas. Este trabalho foi desenvolvido sob a co-orientacao do Professor Rubens Lopes (IO-USP).
Prince, Emily Katherine. "Chemically-mediated interactions in the plankton:." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22701.
Full textCommittee Chair: Kubanek, Julia; Committee Member: Hay, Mark; Committee Member: Jiang, Lin; Committee Member: Pavia, Henrik; Committee Member: Snell, Terry.
Gjersdal, Jan. "Instrumentering og styring av produksjonsprosess for plankton." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14084.
Full textBasu, Ben Kumar. "Plankton development and trophic interactions in rivers." Thesis, University of Ottawa (Canada), 1997. http://hdl.handle.net/10393/10146.
Full textCurrie, Warren J. S. "Scale-invariance and patchiness in the plankton." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ61972.pdf.
Full textGuirey, Emma Jane. "Application of synchronisation theory to plankton patchiness." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/63137/.
Full textEngström-Öst, Jonna. "Effects of cyanobacteria on plankton and planktivores." Helsinki : University of Helsinki, 2002. http://ethesis.helsinki.fi/julkaisut/mat/ekolo/vk/engstrom-ost/.
Full textMenezes, Sunshine. "Nanoplankton biodiversity in the Pettaquamscutt River estuary, Rhode Island, U.S.A. /." View online ; access limited to URI, 2005. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3186914.
Full textBeck, Kristin. "Experimentelle Überprüfung der "Intermediate Disturbance Hypothesis" (Connell 1978) an Modell-Lebensgemeinschaften planktischer Bakterienisolate." [S.l. : s.n.], 2000. http://e-diss.uni-kiel.de/diss.
Full textVeloza, Adriana J. "Transfer of Essential Fatty Acids by Marine Plankton." W&M ScholarWorks, 2005. http://www.vims.edu/library/Theses/Veloza05.pdf.
Full textSvee, Astrid. "Development and Testing of an Acoustic Plankton Recorder." Doctoral thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1477.
Full textRecent years have brought cross-disciplinary focus on possibilities, constraints and consequences of large scale zooplankton harvesting. Development of acoustic measurement technology is an important part of that work. Because of the small size of the plankton, the measurement frequencies have to be high compared to fishery acoustics. Based on a model of the size and shape of the plankton and its physical properties, the use of multiple frequency measurements will allow inverse modeling of the size and concentration of plankton. This thesis presents the development and test results of an Acoustical Plankton Recorder (APR). The system uses three frequencies, 200 kHz, 710 kHz, and 1 MHz. The system parameters are designed with a focus on measuring the zooplankton Calanus finmarchicus, which plays an important role in the Norwegian Sea ecosystem. The APR is a prototype instrument built to gain experience for future generations of instruments for plankton measurements. Different aspects of multi-frequency acoustical measurements are discussed with a focus on uncertainties and critical factors. The results from various experiments and measurements are presented. The estimated concentration of scatterers from data recovered by the Acoustical Plankton Recorder shows good agreement with biological samples.
Haupt, Florian. "Plankton vertical migrations - Implications for the pelagic ecosystem." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-135130.
Full textSanderson, Rory J. "Ecology of freshwater plankton in contrasting hydraulic environments." Thesis, University of Leicester, 1998. http://hdl.handle.net/2381/29785.
Full textOrgill, Christopher H. "Plankton population density measurement by acousto-electronic testing." Thesis, Bangor University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278548.
Full textPan, Anon Maria. "Decapod crustacean larvae in Scottish (UK) coastal plankton." Thesis, University of Aberdeen, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499700.
Full textYool, Andrew. "The dynamics of open-ocean plankton ecosystem models." Thesis, University of Warwick, 1997. http://wrap.warwick.ac.uk/1129/.
Full textVaga, Ralph M. "Experimental studies on trophic interactions in the plankton /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487264603217449.
Full textGonzalez, de Macias Ma Refugio. "Plankton and physiochemical factors in a vernal pool." Scholarly Commons, 1989. https://scholarlycommons.pacific.edu/uop_etds/2183.
Full textHöglander, Helena. "Studies of Baltic Sea plankton : spatial and temporal patterns /." Stockholm : Department of Systems Ecology, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-323.
Full textAnning, Tracy. "The expression of photosynthetic genes in natural populations of marine phytoplankton." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307079.
Full textLee, Nga-wing Christine. "The ecology of planktonic copepods and hyperbenthic communities in the Cape d'Aguilar Marine Reserve, Hong Kong." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25212199.
Full textKramer, Kurt A. "System for Identifying Plankton from the SIPPER Instrument Platform." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3646.
Full textBaird, Mark E. "Towards a verified mechanistic model of plankton population dynamics." Thesis, University of Warwick, 1999. http://wrap.warwick.ac.uk/1123/.
Full textShaw, Stephanie Lyn 1973. "The production of non-methane hydrocarbons by marine plankton." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8255.
Full textIncludes bibliographical references (p. 118-134).
The oceans are a small source of non-methane hydrocarbons (NMHC), a suite of volatile organics whose chemical destruction mechanism by reaction with hydroxyl radical can significantly affect the oxidation capacity of the atmosphere. Little is known about the water column cycling processes that constrain this source; previous work has established a photochemical source for many alkenes, and a phytoplanktonic source for isoprene. The focus of this thesis was to gain further insight on marine microbiological cycling of NMHC. This included investigations on two main themes. The first was the effect of different physiological conditions on phytoplanktonic isoprene production. A variety of phytoplankton were examined for the ability to produce isoprene. All were found to have constant isoprene production rates per cell during exponential growth, with decreasing rates as the populations senesced. A positive allometric relationship between isoprene production rate and cell volume was found; highest production rates were found for the largest cell tested, Emiliania huxleyi, and lowest rates for Prochlorococcus, the smallest. Isoprene production in Prochlorococcus was found to be a function of light intensity and temperature, with patterns similar to the relationships between growth rate of this species and these environmental parameters. The second theme investigated was the effect that heterotrophic marine plankton might have on NMHC cycling. We detected no clear production or consumption of any NMHC, except isoprene, from any of the phytoplankton or other organisms tested.
(cont.) The heterotrophic bacteria examined had no detectable effect on isoprene production per Prochlorococcus cell in a dual-species culture, but a temporary production of isoprene was detected from bacterial cultures grown in organically-enriched media. Nanoflagellate grazing by Cafeteria roenbergensis on Prochlorococcus had no detectable effect on NMHC cycling except to control the total phytoplankton counts, and thus total isoprene production. Besides controlling phytoplankton counts, phage lysis of Prochlorococcus had no detectable effect on NMHC cycling except to decrease isoprene production per Prochlorococcus cell during the latent period of infection. Any other effect these particular organisms may have on NMHC cycling likely involves other processes, such as photochemistry.
by Stephanie Lyn Shaw.
Ph.D.
Hu, Qiao Ph D. Massachusetts Institute of Technology. "Application of statistical learning theory to plankton image analysis." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/39206.
Full textIncludes bibliographical references (leaves 155-173).
A fundamental problem in limnology and oceanography is the inability to quickly identify and map distributions of plankton. This thesis addresses the problem by applying statistical machine learning to video images collected by an optical sampler, the Video Plankton Recorder (VPR). The research is focused on development of a real-time automatic plankton recognition system to estimate plankton abundance. The system includes four major components: pattern representation/feature measurement, feature extraction/selection, classification, and abundance estimation. After an extensive study on a traditional learning vector quantization (LVQ) neural network (NN) classifier built on shape-based features and different pattern representation methods, I developed a classification system combined multi-scale cooccurrence matrices feature with support vector machine classifier. This new method outperforms the traditional shape-based-NN classifier method by 12% in classification accuracy. Subsequent plankton abundance estimates are improved in the regions of low relative abundance by more than 50%. Both the NN and SVM classifiers have no rejection metrics. In this thesis, two rejection metrics were developed.
(cont.) One was based on the Euclidean distance in the feature space for NN classifier. The other used dual classifier (NN and SVM) voting as output. Using the dual-classification method alone yields almost as good abundance estimation as human labeling on a test-bed of real world data. However, the distance rejection metric for NN classifier might be more useful when the training samples are not "good" ie, representative of the field data. In summary, this thesis advances the current state-of-the-art plankton recognition system by demonstrating multi-scale texture-based features are more suitable for classifying field-collected images. The system was verified on a very large real-world dataset in systematic way for the first time. The accomplishments include developing a multi-scale occurrence matrices and support vector machine system, a dual-classification system, automatic correction in abundance estimation, and ability to get accurate abundance estimation from real-time automatic classification. The methods developed are generic and are likely to work on range of other image classification applications.
by Qiao Hu.
Ph.D.
Wallhead, Philip John. "Accounting for unpredictable spatial variability in plankton ecosystem models." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/63762/.
Full textEdwards, Andrew Michael. "A rational dynamical-systems approach to plankton population modelling." Thesis, University of Leeds, 1997. http://etheses.whiterose.ac.uk/21072/.
Full textPiltz, Sofia Helena. "Models for adaptive feeding and population dynamics in plankton." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:811fd94d-d58e-48fa-8848-ad7dc37a099f.
Full textRemsen, Andrew Walker. "Evolution and field application of a plankton imaging system." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002429.
Full textRani, Raj. "Modelling plankton dynamics in the east coast of India." Thesis, IIT Delhi, 2015. http://localhost:8080/xmlui/handle/12345678/6668.
Full textLo, Shiu-hong. "Antibacterial activity of some marine planktonic algae in Hong Kong /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19667152.
Full textZhang, Rui. "Bacterioplankton in Hong Kong waters : diversity, dynamics, and mortality /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?BIOL%202007%20ZHANGR.
Full textBurren, Claire Louise. "A numerical modelling investigation of the impact of mesoscale heterogeneity on oceanic primary productivity." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239965.
Full textLuo, Tong. "Scaling up support vector machines with application to plankton recognition." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001154.
Full textFugagnoli, Alice. "The ratio of plastic to plankton in the Mediterranean Sea." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16962/.
Full textBeisner, Beatrix Elisabeth. "Response of plankton community structure to temporal heterogeneity and productivity." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0011/NQ56503.pdf.
Full textBird, David F. "The ecological importance of algal phagotrophy to lake plankton communities /." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75763.
Full textStromberg, K. H. Patrik. "Plankton size distributions and metabolism of the pelagic global ocean." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520657.
Full textGraziano, Clemente. "Some observations on the plankton of the north Irish Sea." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329418.
Full textBuchberger, Felicitas [Verfasser], and Herwig [Akademischer Betreuer] Stibor. "Plankton dynamics and anthropogenic changes / Felicitas Buchberger ; Betreuer: Herwig Stibor." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2017. http://d-nb.info/1222436493/34.
Full textGustavsson, Maria. "Kalkningseffekter på plankton : ett mesokosmexperiment i den kalkrika sjön Tåkern." Thesis, Linköpings universitet, Biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-130869.
Full text