Дисертації з теми "Planktonic food web"
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Jenkins, David G. "Effects of an herbicide on a planktonic food web." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/90948.
Повний текст джерелаM.S.
James, Neil Anthony. "Evaluating the effect of temperature on the planktonic food-web." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511064.
Повний текст джерелаPtacnik, Robert. "Omnivory in planktonic food webs a study on the impact of mixotrophic flagellates and microzooplankton on food web dynamics and productivity." Kiel Inst. für Meereskunde, 2003. http://e-diss.uni-kiel.de/diss_825/d825.pdf.
Повний текст джерелаDrexel, Jan Peter. "Contribution of Nitrogen Fixation to Planktonic Food Webs North of Australia." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19733.
Повний текст джерелаPtacnik, Robert [Verfasser]. "Omnivory in planktonic food webs : a study on the impact of mixotrophic flagellates and microzooplankton on food web dynamics and productivity / Institut für Meereskunde Kiel. By Robert Ptacnik." Kiel : Inst. für Meereskunde, 2003. http://d-nb.info/972118225/34.
Повний текст джерелаWasserman, Ryan J., Gwynneth F. Matcher, Tim J. F. Vink, and Pierre William Froneman. "Preliminary evidence for the organisation of a bacterial community by zooplanktivores at the top of an estuarine planktonic food web." Springer US, 2015. http://hdl.handle.net/10962/68237.
Повний текст джерелаAs part of a larger investigation, the effect of apex predation on estuarine bacterial community structure, through trophic cascading, was investigated using experimental in situ mesocosms. Through either the removal (filtration) or addition of specific size classes of planktonic groups, four different trophic scenarios were established using estuarine water and its associated plankton. One such treatment represented a “natural” scenario in which stable apex predatory pressure was qualified. Water samples were collected over time from each of the treatments for bacterial community evaluation. These samples were assessed through pyrosequencing of the variable regions 4 and 5 of the bacterial 16S rRNA gene and analysed at the species operational taxonomic unit (OTU) level using a community procedure. The blue-green group dominated the samples, followed by Proteobacteria and Bacteroidetes. Samples were the most similar among treatments at the commencement of the experiment. While the bacterial communities sampled within each treatment changed over time, the deviation from initial appeared to be linked to the treatment trophic scenarios. The least temporal deviation-from-initial in bacterial community was found within the stable apex predatory pressure treatment. These findings are consistent with trophic cascade theory, whereby predators mediate interactions at multiple lower trophic levels with consequent repercussions for diversity.
Radabaugh, Kara. "Light-Environment Controls and Basal Resource Use of Planktonic and Benthic Primary Production." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4564.
Повний текст джерелаErsoy, Zeynep. "Biotic and environmental factors shaping body size distributions in freshwater planktonic food webs." Doctoral thesis, Universitat de Vic - Universitat Central de Catalunya, 2018. http://hdl.handle.net/10803/665387.
Повний текст джерелаIndividual size-based interactions play a significant role in the community dynamics and ecosystem processes of aquatic ecosystems, because body size is a key trait of organisms that is highly linked to metabolic rates. Climate change and disturbances influence freshwater planktonic food webs, weakening the strength of size-based interactions. In this thesis, we conducted four related but independent studies to obtain a deeper understanding of the size-based trophic interactions. We aimed to demonstrate biotic and environmental factors influencing size-based interactions in planktonic food webs using observational and experimental approaches at different locations in Europe. Overall, our key findings from this thesis suggest that integrating size-based relationships and resilience of communities together with intraspecific variation is important while studying trophic interactions. Understanding these interactions will allow us to better manage and restore aquatic ecosystems in the face of climate change and other human-induced disturbances.
Wenzel, Anja. "The role of terrestrial and phytoplankton-derived organic matter in planktonic food webs." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-62287.
Повний текст джерелаSakai, Yoichiro. "Spatio-temporal dynamics of planktonic food webs in the coastal ecosystem of Lake Biwa." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180371.
Повний текст джерелаHenshaw, Tracey. "Seasonal microbial dynamics in two ultra-oligotrophic Antarctic freshwater lakes." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368363.
Повний текст джерелаMeunier, Cédric [Verfasser], and Helmut [Akademischer Betreuer] Hillebrand. "You eat what you need : food quality and trophic interactions in planktonic food webs / Cédric Meunier. Betreuer: Helmut Hillebrand." Oldenburg : IBIT - Universitätsbibliothek, 2012. http://d-nb.info/1025502337/34.
Повний текст джерелаKatechakis, Alexis. "Selected interactions between phytoplankton, zooplankton and the microbial food web: Microcosm experiments in marine and limnic habitats." Diss., Connect to this title online, 2006. http://edoc.ub.uni-muenchen.de/archive/00005047/.
Повний текст джерелаTitle from PDF t.p. (viewed on May 14, 2006). Includes reprints of papers co-authored with others. Vita. Includes bibliographical references.
Protopapa, Maria [Verfasser], and Christian [Akademischer Betreuer] Möllmann. "Plankton food web structures and interactions in the Eastern Mediterranean Sea / Maria Protopapa ; Betreuer: Christian Möllmann." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1195709641/34.
Повний текст джерелаProtopapa, Maria Verfasser], and Christian [Akademischer Betreuer] [Möllmann. "Plankton food web structures and interactions in the Eastern Mediterranean Sea / Maria Protopapa ; Betreuer: Christian Möllmann." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://nbn-resolving.de/urn:nbn:de:gbv:18-99895.
Повний текст джерелаBeckwith, Matthew. "Coupling of autotrophic and heterotrophic plankton food web components in the tidal-freshwater James River, USA." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1706.
Повний текст джерелаStange, Paul [Verfasser]. "The influence of plankton food-web structure on the efficiency of the biological carbon pump / Paul Stange". Kiel : Universitätsbibliothek Kiel, 2017. http://d-nb.info/1142154777/34.
Повний текст джерелаWeissbach, Astrid. "The role of allelopathy in microbial food webs." Doctoral thesis, Linnéuniversitetet, Institutionen för naturvetenskap, NV, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-11375.
Повний текст джерелаPerriss, Stephen James. "The physiological ecology of photosynthetic ciliated protozoa and their trophic roles in freshwater and brackish planktonic microbial food webs." Thesis, Lancaster University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334069.
Повний текст джерелаDaniels, Robert M. "Inverse Model Analysis of Plankton Food Webs in the North Atlantic and Western Antarctic Peninsula." W&M ScholarWorks, 2003. https://scholarworks.wm.edu/etd/1539617808.
Повний текст джерелаBerglund, Johnny. "Pelagic microorganisms in the northern Baltic Sea : Ecology, diversity and food web dynamics." Doctoral thesis, Umeå : Univ, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-618.
Повний текст джерелаMakareviciute-Fichtner, Kriste [Verfasser], Ulrich [Akademischer Betreuer] Sommer, and Martin [Gutachter] Wahl. "Declining silicon to nitrogen ratios : effects on phytoplankton and plankton food webs / Kriste Makareviciute-Fichtner ; Gutachter: Martin Wahl ; Betreuer: Ulrich Sommer." Kiel : Universitätsbibliothek Kiel, 2021. http://d-nb.info/1230407251/34.
Повний текст джерелаResende, Juliana Cristina de. "Efeitos diretos e indiretos do agrotóxico Vertimec® 18 CE e de girinos de Lithobates catesbeianus nos ecossistemas de água doce: um estudo em mesocosmos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-27102015-152544/.
Повний текст джерелаAquatic ecosystems have been impacted due to the intensive use of pesticides and the introduction of exotic species. It is essential to use more realistic experiments for assessing direct and indirect effects of these activities on aquatic communities. This thesis aimed to analyze the effects of the pesticide Vertimec® 18 EC, whose active ingredient is abamectin, on plankton community through a mesocosm experiment during 20 days. Tadpoles of the species Lithobates catesbeianus were introduced in some treatments to simulate complex biological relationships and to evaluate the impact of the introduction of such exotic species on plankton. Different treatments were analyzed, including one case of no contamination (control) and two cases of contamination: 2 μL L-1 (multiple dose) and 8 μL L-1 (single dose). Such conditions were considered both with absence and presence of tadpoles. Physical, chemical and biological (chlorophyll a, qualitative and quantitative aspects of phytoplankton and zooplankton) variables of water and sediment were also monitored. The tadpoles caused an increase in the concentration of nutrients and a decrease of dissolved oxygen concentration and plankton density. In the contaminated treatments, as an indirect effect of the nutrient increase and the mortality of species of Cladocera and Copepoda, the density of phytoplankton and some tolerant species of rotifers increased. In the treatment with the highest concentration of the pesticide, all the tadpoles died. As a result of the death of the tadpoles, there was nutrient enrichment in the water, with an associated increase in the density of some phytoplankton species, reaching a total density of 96,919 ind mL-1. These results suggested that direct and indirect effects occurred on plankton community and water quality through the addition of the contaminant and the tadpoles. We conclude that the mesocosms might contribute to the understanding of these effects and provide subsidies for management of freshwater ecosystems impacted by human activities.
Rodrigues, Lúcia Helena Ribeiro. "Reguladores da dinâmica das comunidades planctônicas e íctica em ecossistemas límnicos subtropicais." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/19125.
Повний текст джерелаBiological communities change in time and space following driving pressures from differences in habitat structure and resource availability. Understanding the ecological role and interactions within aquatic community is essential for any management action trying to improve water quality by interferences in lake food web, ecosystem dynamics and modeling. The present study was carried out in two freshwater systems in Southern Brazil: an irrigated rice field and in a large shallow system, Mangueira Lake. The goal of this study in temporary wetlands was to evaluate the plankton and fish dynamics during a productive cycle. Our results evidenced a temporal gradient by nutrients availability in the temporary wetland studied. However, the limnological variables did not display any horizontal pattern among sampling stations. Linear regression showed a positive relationship between chlorophyll a and nutrients, zooplankton biomass and copepod biomass. In contrast, fish biomass and planktivorous fish biomass were inversely related to chlorophyll a. Statistically significant relationships between DOC with nutrients, plankton and fish biomass were also identified during the rice production cycle. In Mangueira Lake, a shallow system (zmed 3m) and 90 km long, the goal was to evaluate the spatial and temporal distribution of plankton and fish biomass as a function of the presence of the emergent macrophytes Zizaniopsis bonariensis. We also analyzed the existence of longitudinal gradient in lake and the food web structure in system. The PCA and RDA analyses showed the temporal (seasonal) and spatial (North/South) gradient during the study. Analysis of similarity (ANOSIM) applied to environmental variables showed significant differences between sampling sites (North and South). Secchi transparency, DOC and chlorophyll a were significantly different in North and South sampling sites. ANOVA results showed that season effects are stronger in the Northern sampling site. Concerning the community structure in the Mangueira Lake, bacterioplankton biomass, chlorophyll a, zooplankton biomass and fish captures were different seasonally after extracting the habitat structure effect, while in the Southern sampling site only chlorophyll a presented a seasonal significant variation. Habitat structure (by Z. bonariensis stands and open water samples) induced significant differences in chlorophyll a both in North and South samples after extracting seasonal effect. Fish captures do also responded to habitat structure in the North, after extracting the season effect. Analysis of similarity (ANOSIM) applied to fish community also showed significant differences between North and South, although no significant differences between vegetated and open water zones was observed. Fish biomass, number of captures, and richness were different between sampling sites. Based on the δ13C and δ15N ratios and analysis of stomach content of fish species, we provide also a description of food web structure, trophic positions of fish species and primary producers of system. Analysis of nitrogen isotope ratios yielded two fish trophic levels in Mangueira Lake. Emergent macrophytes and periphyton were important carbon source that sustain the food web structure of the system. Cluster analysis of δ13C and δ15N values and stomach content yielded a perfect phylogenetic arrangement of species. This result reflects that major feeding niches are shared by taxonomically related species. The feeding dynamics of the dominant fish species, Oligosarcus jenynsii was analysed by using analyses of stomach contents and stable isotopes signature. Seasonal and ontogenetic change in the feeding biology of O. jenynsii was identified, showing the high feeding plasticity, in addition to an opportunistic strategy of this generalist carnivore species. This study allows identifying a large spatial heterogeneity and clear longitudinal gradient both in biotic and abiotic factors, reflecting fish and plankton distribution and abundance. The evaluated parameters are intended to feed a mathematical model for the Mangueira Lake, looking for predictable scenarios from natural and anthropogenic stressors.
Speekmann, Christa Liane Buskey Edward Joseph. "Use of RNA:DNA ratios for assessing secondary production of planktonic food webs effects of temperature, salinity, food and heavy metals /." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/2106/speekmannc93810.pdf.
Повний текст джерелаSpeekmann, Christa Liane. "Use of RNA:DNA ratios for assessing secondary production of planktonic food webs: effects of temperature, salinity, food and heavy metals." Thesis, 2005. http://hdl.handle.net/2152/2106.
Повний текст джерелаBeckwith, Matthew J. "Coupling of autotrophic and heterotrophic plankton food web components in the tidal-freshwater James River, USA: /." 2009. http://hdl.handle.net/10156/2397.
Повний текст джерелаScheinberg, Rebecca D. "Food web structure and trophic dynamics of a subtropcal plankton community, with an emphasis on appendicularians." Thesis, 2004. http://proquest.umi.com/pqdweb?index=0&did=775187651&SrchMode=1&sid=5&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1233889097&clientId=23440.
Повний текст джерелаRyan, Michael J. "The biotic and abiotic interactions influencing organochlorine contaminants in temporal trends (1992-2003) of three Yukon lakes: focus on Lake Laberge." Thesis, 2007. http://hdl.handle.net/1993/227.
Повний текст джерелаMay 2006