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Rozprawy doktorskie na temat „Aquatic ecosystems”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Palesse, Stephanie. "Déterminisme de la décision lysogénique au sein des communautés virales aquatiques : importance des fluctuations physiologiques et métaboliques des hôtes procaryotes." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22520.

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Tan, Xiang. "Environmental Influences on Benthic Algal Communities and their Application for Biomonitoring of Australian and Chinese Rivers." Thesis, Griffith University, 2015. http://hdl.handle.net/10072/367601.

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Benthic algae a re one of the most important primary producers i n lotic ecosystems, and changes i n their community structure and function (e.g., metabolism) will influence other organisms at higher trophic levels or even the entire aquatic ecosystem through bottom-up effects. Since they are known to be sensiti ve to changes i n ambient conditions, benthic algae and especially diatoms have been widely used as i ndicators of environmental changes in aquatic ecosystems, particular ly i n E urope , through developi ng diatom-based indices. However, these indices have not been widely

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3

Perusse, Martin. "Metal cycling in terrestrial and aquatic ecosystems." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59848.

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The present study examines the cycling of elements in the biosphere. The first chapter proposes a theoretical framework for this cycling based on both metal/ligand theory and mass balance studies. Empirical modelling serves as an alternative and complement to mass balance studies in predicting the export of elements from watersheds. Watershed output (export per unit area per unit of time) is predicted using atmospheric deposition rates, an element bonding strength index, the watershed area and a forest classification (deciduous vs coniferous). Finally the last chapter examines, in a speculativ

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4

Gjata, Nerta. "Food Web Simulation Studies on Aquatic Ecosystems." Doctoral thesis, Università degli studi di Trento, 2013. https://hdl.handle.net/11572/367707.

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There is an increasing interest in dynamical food web modeling, and recent advances of computational biology provide new algorithms and tools for modern systems ecology. In this work stochastic individual-based models are used for simulating food web dynamics in two case studies: the Kelian river, in Borneo, Indonesia and a marine ecosystem in Gulf of Guinea. The two cases present effects from human perturbations. In both cases, we constructed food webs, based on real databases. We parameterized the stochastic dynamical model for the system models and performed sensitivity analysis (and commu

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5

Gjata, Nerta. "Food Web Simulation Studies on Aquatic Ecosystems." Doctoral thesis, University of Trento, 2013. http://eprints-phd.biblio.unitn.it/1140/1/TesiN_Gjata.pdf.

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There is an increasing interest in dynamical food web modeling, and recent advances of computational biology provide new algorithms and tools for modern systems ecology. In this work stochastic individual-based models are used for simulating food web dynamics in two case studies: the Kelian river, in Borneo, Indonesia and a marine ecosystem in Gulf of Guinea. The two cases present effects from human perturbations. In both cases, we constructed food webs, based on real databases. We parameterized the stochastic dynamical model for the system models and performed sensitivity analysis (and comm

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6

Holland, Angela. "BRIDGING AQUATIC AND TERRESTRIAL ECOSYSTEMS: ECOLOGY OF SEMI-AQUATIC MAMMALS IN SOUTHERN ILLINOIS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/dissertations/1269.

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Mammals in freshwater aquatic systems play important roles as ecosystem engineers, trophic transfer agents, and apex predators, thus acting as indicators of freshwater ecosystem function. Watersheds inhabited by semi-aquatic mammals have increased links between adjacent terrestrial and aquatic ecosystems compared to watersheds where they are not present. Semi-aquatic mammals not only exert top-down influences on streams, but are affected by bottom-up forces from the riparian system itself. The goal of this study was to identify variables that correlate with the presence of beaver (Castor ca

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7

James, Joanna. "The impact of invasive crayfish on aquatic ecosystems." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/89031/.

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Crayfish are keystone species and ecosystem engineers that affect the structure and function of aquatic ecosystems. Whilst ecological impacts are caused by crayfish in their native range, non - native crayfish species typically have a greater ef fect on some other aquatic organisms and ecosystem processes (Chapter 2). Crayfish are extremely successful invaders that often cause declines in native cra yfish (Chapter 3). Of the 7 non - native crayfish species in the UK, the signal crayfish ( Pacifastacus leniusculus ) is currently the most widespread (Chapter 3). Field and laboratory data, howeve

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8

Kamara, Sheku. "Physiological responses of aquatic macrophytes to natural organic matter potential for structuring aquatic ecosystems." Berlin Logos-Verl, 2008. http://d-nb.info/992155371/04.

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9

Bruce, Louise Christina. "A study of the interaction between the physical and ecological processes of three aquatic ecosystems /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2007.0178.

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10

Ding, Yan. "Environmental Dynamics of Dissolved Black Carbon in Aquatic Ecosystems." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/846.

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Black carbon (BC), the incomplete combustion product from biomass and fossil fuel burning, is ubiquitously found in soils, sediments, ice, water and atmosphere. Because of its polyaromatic molecular characteristic, BC is believed to contribute significantly to the global carbon budget as a slow-cycling, refractory carbon pool. However, the mass balance between global BC generation and accumulation does not match, suggesting a removal mechanism of BC to the active carbon pool, most probable in a dissolved form. The presence of BC in waters as part of the dissolved organic matter (DOM) pool was

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11

CORTEZ, FERNANDO S. "Avaliacao ecotoxicologica do farmaco triclosan para invertebrados marinhos." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9946.

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Made available in DSpace on 2014-10-09T12:33:07Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:17Z (GMT). No. of bitstreams: 0<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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12

Lee, David George. "Environmental change and freshwater macroinvertebrates at Wicken Fen, Cambridgeshire." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254522.

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13

McGuckin, Sara Olivia. "Modelling phosphorus losses from agricultural catchments to surface waters using GIS." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314181.

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14

Simpson, Ian Charles. "The impact of agricultural practices on the aquatic invertebrate populations of ricefields." Thesis, Cardiff University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274018.

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15

Scheurer, David Louis. "A spatially-explicit framework for investigating patchiness in aquatic ecosystems." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3835.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Marine-Estuarine-Environmental Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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16

Miserendino, Rebecca Adler. "Tracing mercury pollution in aquatic ecosystems| Implications for public health." Thesis, The Johns Hopkins University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3571745.

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<p>This dissertation addressed questions pertaining to mercury (Hg) fate and transport in aquatic ecosystems by applying stable Hg isotopes as a tracer. Mercury poses a public health burden worldwide. In parts of the developing world, Hg-use during artisanal and small-scale gold mining (ASGM) is pointed at as the source of elevated Hg in the environment. However, Hg from other sources including soil erosion associated with land cover and land-use change (LCLUC) may also contribute to local Hg pollution. </p><p> Stable Hg isotope profiles of sediment cores, surface sediments, and soils from t

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17

Колмикова, Аліна Ігорівна. "Prospects for reducing the impact of phosphates on aquatic ecosystems." Thesis, Національний авіаційний університет, 2020. http://er.nau.edu.ua/handle/NAU/43595.

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Робота публікується згідно наказу ректора від 21.01.2020 р. №008/од "Про перевірку кваліфікаційних робіт на академічний плогіат у 2019-2020 навчальному році". Керівник проекту: доцент кафедри екології, к.б.н., Білик Тетяна Іванівна<br>The object of research is the pollution of aquatic ecosystems with phosphates. The subject of research is the reduction of the impact of phosphates on aquatic ecosystems due to the improvement of wastewater treatment systems. The aim of the work was to analyze the prospects for reducing water pollution by phosphates and their impact on aquatic ecosystems due t

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18

Kuusiola, S. (Satu). "Fate and effects of sewage derived estrogens on aquatic ecosystems." Master's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201709062802.

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Estrogens are steroidal hormones that can affect the endocrine system at very low levels. Impacts of natural and synthetic estrogens on environment are under arising concern, since they are systematically discharged into environment and impacts on ecosystems and accumulation via food webs are not fully known. Natural and synthetic estrogens originating from households enter the sewage systems and are conveyed to wastewater treatment plants (WWTP). Because current WWTPs are not designed to remove these compounds, they are then discharged into the environment. Other significant source of estroge

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19

Mustow, Stephen Eric. "Aquatic macroinvertebrates and environmental quality in rivers in Northern Thailand." Thesis, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266399.

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20

Tugiyono. "Metabolic enzymes and mixed-function oxygenase (MFO) system in pink snapper (Pagrus auratus): biochemical and histological relationships." Thesis, Curtin University, 2001. http://hdl.handle.net/20.500.11937/1937.

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The environmental health of aquatic ecosystems depends amongst others, on the chemical pollution coming from activities in the catchment's area. In the Swan River Estuary, Western Australia, the chemical pollutants of concern released into the river are petroleum hydrocarbons and sodium pentachlorophenate (NaPCP). Decreased water quality causes a loss of biotic diversity especially amongst fish populations. The health of aquatic ecosystems can be monitored by fish health, especially fish located at higher levels in the food chain. Pink snapper (Pagrus auratus), an endemic Western Australian fi

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21

Aronsson, K. Andreas. "Effects of wood ash on freshwater organisms and aquatic forest ecosystems." Doctoral thesis, Sundsvall : Mittuniversitetet, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-36.

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22

Ruddock, Peter John. "Fish bile metabolites : the assessment of PAH contamination in aquatic ecosystems." Thesis, University of the West of England, Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365188.

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23

Konovalenko, Lena. "Element transport in aquatic ecosystems – Modelling general and element-specific mechanisms." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-110064.

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Radionuclides are widely used in energy production and medical, military and industrial applications. Thus, understanding the behaviour of radionuclides which have been or may be released into ecosystems is important for human and environmental risk assessment. Modelling of radionuclides or their stable element analogues is the only tool that can predict the consequences of accidental release. In this thesis, two dynamic stochastic compartment models for radionuclide/element transfer in a marine coastal ecosystem and a freshwater lake were developed and implemented (Paper I and III), in order

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24

Li, Xin. "Tracing the flow of phosphorus, carbon and nitrogen in aquatic ecosystems." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-06222009-135458.

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Thesis (Ph. D.)--Florida State University, 2009.<br>Advisor: Yang Wang, Florida State University, School of Arts and Sciences, Dept. of Geological Sciences. Title and description from dissertation home page (viewed Oct. 21, 2009). Document formatted into pages; contains ix, 88 pages. Includes bibliographical references.

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25

VAJ, CLAUDIA. "Ecotoxicological effects on structure and function of aquatic and terrestrial ecosystems." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/19729.

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The traditional procedures for the ecotoxicological risk assessment are general, schematic and simplified and, for these reason, they are powerful tools for regulation purposes. Anyway, they don't take into account the actual consequences on natural communities, the interactions among populations within the community or the indirect effects of a contamination. The need of more "ecological realism" into them is thus felt. Recently, the application of the vulnerability concept, instead of sensitivity, and the use of biological characteristics (traits) of organisms for predicting it represent ste

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26

McCormack, Trevor. "Flow injection chemistries for the in situ monitoring of nutrients in sea water." Thesis, University of Plymouth, 1996. http://hdl.handle.net/10026.1/494.

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27

Jones, John Iwan. "An ecophysiological study of the Elodea nuttallii-epiphyton association." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386811.

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28

Roets, Wietsche. "Groundwater Dependence of Aquatic Ecosystems associated with the Table Mountain Group Aquifer." Thesis, University of the Western Cape, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3210_1263507816.

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<p>Results from this study enables a better understanding of groundwater surface water interactions in the TMG, particularly regarding aquatic ecosystems. It has also highlighted the necessity to do proper impact assessments before proceeding with bulk abstraction from this important aquifer. The results also demonstrated the importance of differentiating between real groundwater and non-groundwater discharge contributions to surface hydrology and where these interface areas are located.</p>

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29

Boontanon, Narin. "Biogeochemical and Ecological Studies of Dissolved Nitrous Oxide in Several Aquatic Ecosystems." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150869.

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30

Kasulo, Victor S. W. "Bioeconomic management of aquatic ecosystems for conservation and sustainabile utilisation of biodiversity." Thesis, University of York, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247006.

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31

Filho, Aldeney Andrade Soares. "Phytoplankton Community and Water Quality, Aquatic Ecosystems in the State of CearÃ." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7761.

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RESUMO A Ãgua constitui o recurso de maior importÃncia para o homem, no entanto parece nÃo existir nenhuma preocupaÃÃo do ser humano em preservÃ-la, uma vez que as atividades diÃrias estÃo prejudicando cada vez mais, a qualidade deste recurso. Este trabalho teve por objetivo analisar a estrutura da comunidade fitoplanctÃnica e a qualidade da Ãgua de ecossistemas aquÃticos do Estado do CearÃ (Brasil). Foram realizadas coletas mensais nas estaÃÃes chuvosa e seca, entre 2004 e 2007, nos seguintes ecossistemas: estuÃrios dos rios CauÃpe, MundaÃ, CearÃ e Malcozinhado; lagoas de Jijoca, PecÃm, UruaÃ

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32

Qin, Jianguang. "Effects of fertilization and fish predation on trophic dynamics in aquatic ecosystems /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu148784937729584.

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33

TAFFI, MARIANNA. "Bioaccumulation and bioremediation modelling in Aquatic ecosystems: the Adriatic Sea case study." Doctoral thesis, Università degli Studi di Camerino, 2015. http://hdl.handle.net/11581/401732.

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Understanding the pathways of contaminant transfer within trophic networks is of paramount importance to weigh up forces driving ecological changes and to plan focused intervention strategies targeted to environmental conservation. The subject developed in this PhD dissertation aligns with this goal and encompasses the combination of different modelling approaches with experimental data to interpret the effects of bioaccumulation and bioremediation phenomena on species. Toxic agents adversely influence substance and energy fluxes at the ecosystem level affecting in turn the number of inter- an

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34

Bruce, Louise Christina. "A study of the interaction between the physical and ecological processes of three aquatic ecosystems." University of Western Australia. Centre for Water Research, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0178.

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Due to the complex nature of aquatic food webs, the interaction between abiotic and biotic factors that govern ecosystem dynamics is often elusive. Recent advancements in both the collection of reliable field data and the development of ecological models have enabled researchers to gain insights into these more complex interactions. In this study the relationship between physical and ecological processes has been explored by applying a process based coupled physical and ecological model (DYRESM-CAEDYM) to the data sets of three aquatic ecosystems. In the first, the role of zooplankton in the n

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35

Ansa-Asare, Osmund Duodu. "Do diurnal dissolved oxygen cycles have diagnostic value for assessing pollution status in lakes?" Thesis, University of Aberdeen, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285509.

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The effects of pollutant burdens on natural cyclic patterns in aquatic ecosystems have been studied, to test the hypothesis that a parameter or parameters describing the <I>pattern of variation </I>in a single determinant, such as DO or pH, may be used to describe the status of a body of water more meaningfully than results from single spot measurements. In this study the background water quality in a Scottish and a Ghanaian lake was assessed, then <I>rafts </I>were built on the lakes (Myrtle Dam and Weija Lake respectively) creating three small lakes to test the effects of pollutant loads (<I

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36

Williams, Adrian Evin. "Effects of coarse fish in shallow lake ecosystems : an ecological and sociological appraisal." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312490.

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37

Gyllenhammar, Andreas. "Predictive Modelling of Aquatic Ecosystems at Different Scales using Mass Balances and GIS." Doctoral thesis, Uppsala University, Department of Earth Sciences, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4143.

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<p>This thesis presents models applicable for aquatic ecosystems. Geographical Information Systems (GIS) form an important part of the thesis. The dynamic mass balance models focus on nutrient fluxes, biotic/abiotic interactions and operate on different temporal and spatial scales (site, local, regional and international). The relevance and role of scale in mass balance modelling is a focal point of the thesis.</p><p>A mesocosm experiment was used to construct a model to estimate the nutrient load of phosphorus and nitrogen from net cage fish farming (i.e., the site scale). The model was used

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38

Hillmer, Kiekebusch Ingrid Andrea. "Scales of interactions between physical processes, primary producers and nutrients in aquatic ecosystems." University of Western Australia. Centre for Water Research, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0177.

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[Truncated abstract] Estimating internal biogeochemical fluxes is essential to the understanding of the dynamic of aquatic ecosystems. Different ecological approaches have been used to gain insight into the internal cycling, but success has been limited. A critical point is the identification of the characteristic scales of patterns and the underlying processes affecting the behaviour of biological and chemical species. Failing to capture these scales leads to misinterpretation of field and numerical data. In this study, key aspects in the design of ecological surveys are identified to ensure

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39

Adams, Georgina. "Understanding human impacts on aquatic ecosystems : quantitative approaches to size-based community indicators." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/59952.

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Body size is a fundamental property of organisms that underpins the structure and function of aquatic communities. Human impacts such as climate or fishing can significantly alter the size structure of ecological communities. This thesis aimed to understand further the effect of those impacts on properties of size-based indicators in real communities, by examining trends at levels of organisation or scales that have not been studied in detail before. To do this, various quantitative approaches were developed that allowed 1) trends in size-based indicators to be decomposed into contributions of

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40

Albergaria, Furtado Semedo Miguel. "Animal Waste and Antibiotic Impacts on Microbial Denitrification in Terrestrial and Aquatic Ecosystems." W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1582642568.

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The global increase in livestock and poultry production observed in the last decades has led to an increase in animal waste generated. The animal waste contains high levels of nitrogen and may carry antibiotics that can disturb important microbial activities such as denitrification in terrestrial and aquatic ecosystems. Disturbances of microbial denitrification can have detrimental consequences to environmental health. In the terrestrial environment, denitrification is an important source and sink of N2O, a potent greenhouse gas in the atmosphere. In aquatic ecosystems, denitrification is a do

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41

Nfon, Erick. "Tools for Evaluating the Fate and Bioaccumulation of Organic Compounds in Aquatic Ecosystems." Doctoral thesis, Stockholm : Department of applied environmental science (ITM), Stockholm University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-26383.

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42

Tugiyono. "Metabolic enzymes and mixed-function oxygenase (MFO) system in pink snapper (Pagrus auratus) : biochemical and histological relationships /." Curtin University of Technology, Department of Environmental Biology, 2001. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=13744.

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The environmental health of aquatic ecosystems depends amongst others, on the chemical pollution coming from activities in the catchment's area. In the Swan River Estuary, Western Australia, the chemical pollutants of concern released into the river are petroleum hydrocarbons and sodium pentachlorophenate (NaPCP). Decreased water quality causes a loss of biotic diversity especially amongst fish populations. The health of aquatic ecosystems can be monitored by fish health, especially fish located at higher levels in the food chain. Pink snapper (Pagrus auratus), an endemic Western Australian fi

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43

Alves, Rachel Cristina Prehl [UNESP]. "Inter-relações entre zooplâncton e fitoplâncton mediante herbivoria na Lagoa do Camargo (zona de desembocadura do Rio Paranapanema na Represa de Jurumirim)." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/106486.

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Made available in DSpace on 2014-06-11T19:35:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-19Bitstream added on 2014-06-13T18:47:07Z : No. of bitstreams: 1 alves_rcp_dr_botib.pdf: 4373370 bytes, checksum: 868dbf433604bb75f86e445787dedfc8 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Os organismos planctônicos são a base das cadeias alimentares no ecossistema aquático e os herbívoros zooplanctônicos, em particular, são importantes para o fluxo de energia nos ecossistemas aquáticos, sendo um elo entre os produtores primários e níveis tróficos ma

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44

Perriss, 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.

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Ebrahimi, Mansour. "Effects of pollution on steroidogenesis and sperm in fish." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389736.

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46

Fretzer, Sarah. "Analysing the effects of anthropogenic activities on two aquatic ecosystems in Western Australia and identifying sustainable policies for ecosystem-based management." Thesis, Fretzer, Sarah (2013) Analysing the effects of anthropogenic activities on two aquatic ecosystems in Western Australia and identifying sustainable policies for ecosystem-based management. PhD thesis, Murdoch University, 2013. https://researchrepository.murdoch.edu.au/id/eprint/21292/.

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Anthropogenic impacts such as fishing and eutrophication are significant challenges to the sustainable management of aquatic ecosystems. This study used two ecosystem modelling techniques to investigate the effects of fishing and eutrophication on aquatic ecosystems in Western Australia. Firstly, a qualitative modelling technique called ‘loop analysis’ or ‘qualitative modelling’ was used to characterise the dynamics of the seagrass ecosystem in Shark Bay, Western Australia (Chapter 2). A qualitative model based on differential equations, was developed to represent the dynamics of the seagra

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Velghe, Katherine. "Quantifying biodiversity in aquatic ecosystems: evaluating the causes for congruent patterns across trophic levels." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106467.

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Understanding the drivers and patterns of biological diversity has been a central tenet for ecologists over the past century. Aquatic ecosystems appear to be particularly sensitive to biodiversity declines and thus comprehending the causes of these biodiversity losses has become a pressing issue. The objectives of this thesis are twofold. First, I wanted to investigate the effect of phosphorus, a surrogate for productivity in aquatic ecosystems, on the diversity of two taxonomic groups across broad spatial and temporal scales. Secondly, I wanted to quantitatively assess the use of biodiversity

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Abada, Ahmed El-Sayed Ahmed. "From rivers to oceans : a comparison of contrasting aquatic ecosystems using benthic size spectra." Thesis, University of Plymouth, 2000. http://hdl.handle.net/10026.1/1671.

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This thesis uses a range of different size spectra to compare contrasting benthic habitats in the aquatic realm. Temporal and spatial variation in benthic size spectra were investigated across a full salinity gradient (i.e. from freshwater, through estuarine to marine) in the River Yealm, south Devon, in order to gauge the influence of large differences in taxonomy and evolutionary history. Abundance and biomass size spectra showed a similar pattern among sites in all seasons but winter, suggesting that the size structure of benthic communities may be similar in sites with very different commu

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Rassner, Sara. "Influences of bacterial resources on the dynamics of virus-bacterium interactions in aquatic ecosystems." Thesis, Aberystwyth University, 2010. http://hdl.handle.net/2160/843eeee2-7b1c-4d03-80b4-77ffb5b186a9.

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Utayopas, Poranee. "Fluctuating asymmetry of fish populations as a bioindicator of environmental quality in aquatic ecosystems." Thesis, Utayopas, Poranee (1997) Fluctuating asymmetry of fish populations as a bioindicator of environmental quality in aquatic ecosystems. PhD thesis, Murdoch University, 1997. https://researchrepository.murdoch.edu.au/id/eprint/52018/.

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A study of fluctuating asymmetry (FA) in two species of fish; the Swan River goby (Pseudogobius olorum) and the mosquitofish (Gambusia holbrooki) was undertaken at wetlands in Perth, Western Australia. Although significant levels of FA were recorded, no clear relationships between FA and the concentrations of pollutants were found. Physicochemical stress, ecological stress and genetic factors were hypothesized to be causative factors of the FA detected. A laboratory investigation based on the experimental effects of temperature, conductivity and food availability on G. holbrooki collected

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