Dissertations / Theses on the topic 'Phytoplankton'
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Striebel, Maren. "Phytoplankton-Daphnien-Interaktionen Einfluss der Epilimniontiefe auf Phytoplankton-Daphnien-Interaktionen mit Schwerpunkt Phytoplankton." Saarbrücken VDM Verlag Dr. Müller, 2004. http://d-nb.info/989156214/04.
Full textDurham, William McKinney. "Phytoplankton in flow." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70868.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 111-120).
Phytoplankton are small, unicellular organisms, which form the base of the marine food web and are cumulatively responsible for almost half the global production of oxygen. While phytoplankton live in an environment characterized by ubiquitous fluid motion, the impacts of hydrodynamic conditions on phytoplankton ecology remain poorly understood. In this thesis, we propose two novel biophysical mechanisms that rely on the interaction between phytoplankton motility and fluid shear and demonstrate how these mechanisms can drive thin phytoplankton layers and microscale cell aggregations. First, we consider 'thin phytoplankton layers', important hotspots of ecological activity that are found meters beneath the ocean surface and contain cell concentrations up to two orders of magnitude above ambient. While current interpretations of their formation favor abiotic processes, many phytoplankton species found in these layers are motile. We demonstrate that layers can form when the vertical migration of phytoplankton is disrupted by hydrodynamic shear. Using a combination of experiments, individual-based simulations, and continuum modeling, we show that this mechanism - which we call 'gyrotactic trapping' - is capable of triggering thin phytoplankton layers under hydrodynamic conditions typical of the environments that often harbor thin layers. Second, we explore the potential for turbulent shear to produce patchiness in the spatial distribution of motile phytoplankton. Field measurements have revealed that motile phytoplankton form aggregations at the smallest scales of marine turbulence - the Kolmogorov scale (typically millimeters to centimeters) - whereas non-motile cells do not. We propose a new mechanism for the formation of this small-scale patchiness based on the interplay of gyrotactic motility and turbulent shear. Contrary to intuition, turbulence does not stir a plankton suspension to homogeneity, but instead drives patchiness. Using an analytical model of vortical flow we show that motility can give rise to a striking array of patchiness regimes. We then test this mechanism using both laboratory experiments and isotropic turbulent flows generated via Direct Numerical Simulation. We find that motile phytoplankton cells rapidly form aggregations, whereas non-motile cells remain randomly distributed. In summary, this thesis demonstrates that microhydrodynamic conditions play a fundamental role in phytoplankton ecology and, as a consequence, can contribute to shape macroscale characteristics of the Ocean.
by William McKinney Durham.
Ph.D.
Heilmann, Jens Peter. "Eutrophication, phytoplankton productivity and the size structure of the phytoplankton community." Thesis, Bangor University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263279.
Full textTang, Senming. "Seasonal changes in phytoplankton species composition at Port Shelter, Hong Kong, China (1998-1999)." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22718850.
Full textMaldonado-Pareja, Maria Teresa. "Iron acquisition by marine phytoplankton." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0022/NQ50215.pdf.
Full textContant, Jacinthe. "Phytoplankton Communities in Temperate Rivers." Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20623.
Full textFoy, R. H. "Phytoplankton growth in Lough Neagh." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333608.
Full textBrowning, Thomas John. "Nutrient limitation of marine phytoplankton." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:e250879e-131e-406a-a3cb-571e00dc0c81.
Full textCharlton, Fergus. "Remote sensing of freshwater phytoplankton." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/21140.
Full textMalick, Lisa A. "Light quality and phytoplankton viability." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000350.
Full textSackmann, Brandon S. "Remote Assessment of 4-D Phytoplankton Distributions off the Washington Coast." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/SackmannBS2007.pdf.
Full textMoore, Timothy S. "Dynamics of phytoplankton community composition in the western Gulf of Maine." Restricted access (UM), 2008. http://libraries.maine.edu/gateway/oroauth.asp?file=orono/etheses/37803141.pdf.
Full textTitle from PDF title page. Available through UMI ProQuest Digital Dissertations. Includes bibliographical references (leaves 145-157). Also issued in print.
Mouw, Colleen Beckmann. "Bio-optical and remote sensing investigation of phytoplankton community size structure /." View online ; access limited to URI, 2009. http://digitalcommons.uri.edu/dissertations/AAI3368002.
Full textJohnson, Virginia L. "Primary productivity by phytoplankton : temporal, spatial and tidal variability in two North Carolina tidal creeks /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/johnsonv/virginiajohnson.pdf.
Full textHardenbicker, Paulin. "Phytoplankton dynamics in two large rivers:." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-147859.
Full textAnhand von drei verschiedenen Ansätzen analysiert die vorliegende Arbeit die Regulierung von Phytoplankton in großen Flüssen durch klimabedingte Faktoren: Auswertung von Langzeitdaten, räumliche Dynamik (fließzeitkonforme, longitudinale Beprobungen) und mathematische Modellierung. Die zentrale Hypothese ist, dass Abfluss eine dominante Rolle unter den klimabedingten Faktoren spielt und die Phytoplanktonbiomasse stark beeinflusst. Eine multifaktorielle statistische Analyse basierend auf Langzeitdaten (1990 – 2009; 1994 –2009) von zwei Stationen der Flüsse Rhein und Elbe zeigten, dass hauptsächlich Abflussbedingungen und Lichtverfügbarkeit die Antriebskräfte bei der Regulierung der Phytoplanktonfrühjahrsblüte darstellten. Während sich am Rhein ein Trend hin zu einem früheren Auftreten der Frühjahrsblüte und einer Abnahme der mittleren Phytoplankton-biomasse während der Vegetationsperiode zeigte, konnte für die Elbe keine zeitliche Verschiebung der Frühjahrsblüte festgestellt werden und mittlere Phytoplanktonbiomassen zeigten hier eine steigende Tendenz. Longitudinale Fließzeitbeprobungen dienten zur Analyse der kurzfristigen räumlichen Entwicklung des Planktons. Interne Produktions- und Verlustprozesse, sowie der Eintrag durch Zuflüsse wurden untersucht. Vier longitudinale Profile wurden zu unterschiedlichen Jahreszeiten der letzten Jahre (2009 – 2011) realisiert und es wurde gezeigt, dass die Nebenflüsse der Elbe vorwiegend einen Verdünnungseffekt auf die Planktondichten des Hauptstromes hatten, während sie für den Rhein einen wichtigen zusätzlichen Eintrag von Phyto- und Zooplankton darstellten. In der vorliegenden Arbeit wurden hohe Muscheldichten im Rhein gefunden, die möglicherweise zu hohen internen Planktonverlusten durch Fraß beigetragen haben, und somit zu niedrigen Phytoplankton-konzentrationen geführt haben könnten. In der Elbe waren die Muscheldichten dagegen gering und somit war auch der benthische Fraßdruck niedriger. Auf der anderen Seite zeigte ein ungewöhnlich niedriges Abflussereignis im Frühjahr 2011 am Rhein, dass diese Verlustprozesse zeitweise von starker Phytoplanktonproduktion überlagert werden können und dadurch extrem hohe Phytoplanktonbiomassen und Chlorophyllwerte entstehen können. Demzufolge können trotz der Beobachtung eines langfristigen abnehmenden Trends in den Chlorophyllgehalten während der letzen zwei Jahrzehnte extreme Umweltbedingungen einen Regime-shift mit außergewöhnlichen Massenentwicklungen des Phytoplanktons hervorrufen. Um den möglichen Einfluss des zukünftigen Klimawandels auf die Gewässergüte abzuschätzen, wurde mithilfe des Gewässergütesimulationsmodells QSim ein Modell für den frei fließenden Abschnitt des Rheins erstellt. Für den Modellierungsansatz wurden die hydrologischen und klimatologischen Eingangsdaten entsprechend der verschiedenen Klimaprojektionen für die nahe (2021 – 2050) und ferne Zukunft (2071 – 2100) verändert. Die Modellergebnisse zeigten, dass sich Änderungen in den klimatischen Bedingungen, einschließlich Abflussreduktion und Wassertemperaturanstieg, nur geringfügig auf die Phytoplankton¬biomasse des Rheins auswirkten. Die vorliegende Arbeit deutet darauf hin, dass Klimawandeleffekte eher durch Änderungen der Abflussverhältnisse auf das Phytoplankton in großen Flüssen wirken als durch Änderungen der Wassertemperatur. Der Effekt ist jedoch flusssystemspezifisch, da die Auswirkungen von systemspezifischen Unterschieden in den Hauptkontrollmechanismen gesteuert werden (z.B. ‚Bottom-up’ versus ‚Top-down’)
Regel, Rudi Herbert. "Phytoplankton and turbulence at selected scales." Title page, contents and summary only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phr333.pdf.
Full textChan, Terence. "Phytoplankton dynamics in a seasonal estuary." University of Western Australia. Centre for Water Research, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0089.
Full textKennaway, Gabrielle M. A. "The population biology of freshwater phytoplankton." Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236909.
Full textWilson, William Hector. "Characterisation of viruses infecting marine phytoplankton." Thesis, University of Warwick, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283512.
Full textSee, Jason Holt. "Availability of humic nitrogen to phytoplankton." W&M ScholarWorks, 2003. https://scholarworks.wm.edu/etd/1539616848.
Full textTozzi, Sasha. "Photobiological studies of Ross Sea phytoplankton." W&M ScholarWorks, 2010. https://scholarworks.wm.edu/etd/1539616879.
Full textThompson, Brian P. "Temporal and Spatial Variability of Phytoplankton Biomass in the Damariscotta River Estuary, Maine, USA." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/ThompsonBP2006.pdf.
Full textArmstrong, Gary Dale. "Colonies as defence in the freshwater phytoplankton genus Dinobryon (Chrysophyceae)." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24468.
Full textScience, Faculty of
Botany, Department of
Graduate
Allen, Jason D. "Correlating phytoplankton assemblages with water quality in Illinois lakes and reservoirs : validating models based on historical data /." View online, 2008. http://repository.eiu.edu/theses/docs/32211131464742.pdf.
Full textKarp-Boss, Lee. "Phytoplankton-flow interactions in relation to cell size and morphology /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/11004.
Full textHyde, Kimberly Joy Whitman. "Interannual and seasonal phytoplankton variability in Massachusetts Bay from remote and in situ measurements /." View online ; access limited to URI, 2006. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3248231.
Full textLam, Yung-chun Nelson. "Annual distribution of phytoplankton in Tolo Harbour a flow cytometry approach /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22718874.
Full textMaurer, Vinzenz. "Die Produktionsbiologie von Bieler- und Neuenburgersee, 1987-1988 : Beziehungen zwischen Nährstoffen, Algen und Crustaceen /." Bern : Selbstverlag, 1992. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Full textSilsbe, Gregory. "Phytoplankton Production In Lake Victoria, East Africa." Thesis, University of Waterloo, 2004. http://hdl.handle.net/10012/1231.
Full textButler, Joanne Elizabeth. "Phytoplankton ecology in a high arctic polynya." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25080.
Full textApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Kyewalyanga, Margareth Nabuma. "Spectral dependence of photosynthesis in marine phytoplankton." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24750.pdf.
Full textWiegman, Saskia. "Photoenhanced toxicity of azaarenes to marine phytoplankton." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2002. http://dare.uva.nl/document/64908.
Full textThomas, Lorraine. "Estimating phytoplankton growth rates from compositional data /." Online version of original thesis, 2008. http://hdl.handle.net/1912/2255.
Full textHutchings, Alison Jayne. "Phytoplankton distribution in the River Thames, England." Thesis, Durham University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362137.
Full textMacCallum, Iain. "Measurement and modelling of phytoplankton light scattering." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248311.
Full textDimier, Celine. "Photoacclimation processes and ecological characteristics of phytoplankton." Thesis, Open University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437316.
Full textThomas, Lorraine (Lorraine Marie). "Estimating phytoplankton growth rates from compositional data." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43755.
Full text"February 2008."
Includes bibliographical references (p. 133).
I build on the deterministic phytoplankton growth model of Sosik et al. by introducing process error, which simulates real variation in population growth and inaccuracies in the structure of the matrix model. Adding a stochastic component allows me to use maximum likelihood methods of parameter estimation. I lay out the method used to calculate parameter estimates, confidence intervals, and estimated population growth rates, then use a simplified three-stage model to test the efficacy of this method with simulated observations. I repeat similar tests with the full model based on Sosik et al., then test this model with a set of data from a laboratory culture whose population growth rate was independently determined. In general, the parameter estimates I obtain for simulated data are better the lower the levels of stochasticity. Despite large confidence intervals around some model parameter estimates, the estimated population growth rates have relatively small confidence intervals. The parameter estimates I obtained for the laboratory data fell in a region of the parameter space that in general contains parameter sets that are difficult to estimate, although the estimated population growth rate was close to the independently determined value.
by Lorraine Thomas.
S.M.
Yee, Donald. "Cobalt substitution for zinc in marine phytoplankton." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43289.
Full textBalbi, David Michael. "Phytoplankton dynamics of the River Nene, England." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4281/.
Full textBertos-Fortis, Mireia. "Baltic Sea phytoplankton in a changing environment." Doctoral thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-57860.
Full textCrawfurd, Katharine. "Marine phytoplankton in a high CO2 world." Thesis, University of Dundee, 2010. https://discovery.dundee.ac.uk/en/studentTheses/82b46f33-e436-4eff-9862-e464f2761dca.
Full textBrereton, Ashley. "Phytoplankton aggregations in a turbulent boundary layer." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/15833/.
Full textDustman, John M. "Carbon sequestration by Iron seeding of phytoplankton /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Full textDyhrman, Sonya T. "Cellular markers of phosphate stress in phytoplankton /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035410.
Full textBaker, Cynthia Fay. "Phytoplankton in Mt. St. Helens Lakes, Washington." PDXScholar, 1995. https://pdxscholar.library.pdx.edu/open_access_etds/5017.
Full textRoncarati, Francesca <1977>. "Phytoplankton physiological responses under changing environmental conditions." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/541/1/roncarati_francesca_tesi.pdf.
Full textRoncarati, Francesca <1977>. "Phytoplankton physiological responses under changing environmental conditions." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/541/.
Full textVan, Wijk Kim. "The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/18342.
Full textThis study examines the effects of enrichment with organic carbon and nitrogen on inorganic nitrogen partitioning between phyto- and bacterio- plankton. Strongly preferential uptake of ammonium over nitrate was observed by both the phytoplanktonic and bacterial fractions, with RPINH4 values typically between 1 and 5. The bacterial fraction ( <0.8μm) was found to be responsible for as much as 48-75% of community uptake of ammonium; while the netplanktonic fraction was observed to take up approximately 50% of intact community uptake of nitrate. The addition of amino acids appeared to mediate bacterial competition for ammonium, indicating their preference for DON as a nitrogen source and allowing increased ammonium uptake by the nanoplanktonic fraction. The effect of glucose enrichment was complicated by the presence of protozoans, which appeared to be indirectly responsible for decreased ammonium uptake due to depletion of this substrate in the presence of added glucose. The nanoplankton appeared to be responsible for the least nitrogen uptake with respect to biomass, indicating that they may have been subject to competition pressure from both the bacterial and netplanktonic fractions.
Haskell, Andrew Glenn Edward. "Modeling plankton community structure under environmental forcing on the southeastern U.S. contintental shelf." [Norfolk, VA. : Center for Coastal Physical Oceanography], 1997. http://catalog.hathitrust.org/api/volumes/oclc/39263483.html.
Full textTang, Senming, and 唐森銘. "Seasonal changes in phytoplankton species composition at Port Shelter,Hong Kong, China (1998-1999)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B29867976.
Full text