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Dissertations / Theses on the topic 'Aquatic foods'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Bornhoeft, Sarah C. "Influence of Experimental Sheet Flow on Aquatic Foods Webs of the Central Everglades." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2562.

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Establishing historical water velocities is a goal of Everglades restoration because of their role maintaining landscape topographic relief. However, flows may also change the trophic state of marshes by phosphorus loading. I used fatty acid (FA) and stoichiometric data to quantify how increased sheet flow altered the relative heterotrophic and autotrophic contributions to aquatic consumers in a field experiment that introduced flowing water to an Everglades marsh in November, 2014. Algal taxonomic composition was different between pre-flow and flow sampling, marked by increases in the nutrien

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2

Koep, Karin Sarah Coles. "Production of salami from meat of aquatic and terrestrial mammals." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1073.

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3

Rodriguez-Palacios, Alexander. "Ecology and Epidemiology of Human Pathogen Clostridium difficile in Foods, Food Animals and Wildlife." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313582304.

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4

Vander, Zanden M. Jake. "Trophic position in aquatic food webs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ55390.pdf.

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5

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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6

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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7

Nielsen, Jens Munk. "Species interactions and energy transfer in aquatic food webs." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-123600.

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Food webs are structured by intricate nodes of species interactions which govern the flow of organic matter in natural systems. Despite being long recognized as a key component in ecology, estimation of food web functioning is still challenging due to the difficulty in accurately measuring species interactions within a food web. Novel tracing methods that estimate species diet uptake and trophic position are therefore needed for assessing food web dynamics. The focus of this thesis is the use of compound specific nitrogen and carbon stable isotopes and molecular techniques for assessing predat

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8

Richardson, John Stuart. "Seasonal food limitation of detritivorous insects in a montane stream." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/41449.

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Many species of stream invertebrates gain most of their energy by the consumption of coarse detrital materials. While most of these organisms are univoltine or semivoltine, the biomass of assimilable detritus varies seasonally as a result of several processes. The period of detritus input is highly seasonal, decomposition rates are positively temperature dependent, and winter spates result in fragmentation and flushing of detrital materials. From two years of measuring detritus inputs and standing crops, I showed that the abundance of this resource varied by almost two orders of magnitu

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9

Vivas, Muñoz Jenny Carolina. "Trematodes modulate aquatic food webs by altering host feeding behaviour." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20592.

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Parasiten können den Energietransfer in Lebensgemeinschaften über trophische Kaskaden beeinflussen, indem sie Änderungen in den Konsumenten-Ressourcen-Interaktionen induzieren. In der vorliegenden Arbeit wurde die Rolle von Trematoden auf das Freßverhalten ihrer Wirte auf zwei trophischen Ebenen untersucht. Vier verschiedene Süßwasserschnecken-Trematoden-Systeme wurden verwendet, um zu testen, ob ein allgemeines Muster für die Auswirkung von Infektionen auf die Grazingaktivität von Schnecken auf das Periphyton nachgewiesen werden kann. Die Grazingraten auf Periphyton bei infizierten Schnecken

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10

Burian, Alfred. "Impact of food quality on aquatic consumers : Behavioral and physiological adjustments." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-128828.

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Food quantity and quality together determine growth rates of consumers and the utilisation efficiencies of available resources in aquatic and terrestrial ecosystems. The effect of food quality on the performance of consumers is dependent on both, its direct influence on ingestion and assimilation rates, and on the behavioural and physiological adjustments of consumers to their food environment. The main target of this thesis was to investigate the nature and scope of behavioural and physiological adjustments in consumers and assess the resulting consequences for consumers’ fitness and ecosyste

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11

Merkley, Steven S. "An Invasive Species Reduces Aquatic Insect Flux to Terrestrial Food Webs." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2806.

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Although it is well documented how introduced species can negatively affect native species, we only poorly understand how they may alter ecosystem functions. We investigated how an invasive fish affected the flux of aquatic insects to terrestrial food webs using mesocosms in a desert spring ecosystem. We compared aquatic insect emergence between alternative community states with monocultures and polycultures of two native species of fish, least chub (Iotichthys phlegethontis) and Utah chub (Gila atraria) plus, introduced western mosquitofish (Gambusia affinis). We tested three hypotheses: (1)

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12

Kautza, Adam Robert. "Consequences of landscape change on riverine food webs and aquatic-terrestrial linkages." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408719548.

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13

Tristano, Elizabeth. "EFFECTS OF INVASIVE SPECIES INTRODUCTIONS ON NUTRIENT PATHWAYS IN AQUATIC FOOD WEBS." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/dissertations/1566.

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Trophic interactions within aquatic ecosystems are complex, with many different pathways facilitating transfer of energy and nutrients among trophic levels and many different mechanisms that influence energy and nutrient transfer. This is illustrated in the “top down” and “bottom up” regulatory effects on aquatic food webs, through which primary producer biomass and, therefore, herbivore and carnivore densities, are influenced by both nutrient availability (bottom up) and densities of consumers at higher trophic levels (top down). In an aquatic food web, planktivore presence can directly alt

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14

Prast, Mario. "Studies on the impact of food web effects on nitrification in aquatic sediments." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984951970.

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15

Akkas, Sara Banu. "The Effect Of Ecotoxicants On The Aquatic Food Web And Prey-predator Relationships." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610823/index.pdf.

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There is considerable need for higher-tier aquatic risk assessment and information on toxicant-induced molecular alterations in lower aquatic invertebrates. Thus the current study&rsquo<br>s priorities were two-fold: a novel approach utilizing higher-tier ecotoxicity bioassay-guided ATR-FTIR (Attenuated Total Reflectance Fourier Transform Infrared) spectroscopy to better understand the impact of the presence of fish predation pressure &ndash<br>mimicked by predator-exuded info-chemicals &ndash<br>on cypermethrin or salinity toxicity to Daphnia pulex &ndash<br>key-stone species in lake ecosyste

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16

Cabana, Gilbert. "A comparative study of food-web processes in aquatic systems using stable isotopes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0026/NQ29900.pdf.

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17

Mohamed, Fathimath. "Accumulation of trace elements in aquatic food chains due to sea-fill activities." Thesis, University of Canterbury. Department of Chemistry, 2015. http://hdl.handle.net/10092/11125.

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Elevated levels of trace elements in the environment are of great concern because of their persistence, and their high potential to harm living organisms. The exposure of aquatic biota to trace elements can lead to bioaccumulation, and toxicity can result. Furthermore, the transfer of these elements through food chains can result in exposure to human consumers. Sea-fill or coastal fill sites are among the major anthropogenic sources of trace elements to the surrounding marine environment. For example, in the Maldives, Thilafushi Island is a sea-fill site consisting of assorted municipal solid

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18

Clitherow, Leonie Rose. "Terrestrial-aquatic food web linkages across floodplains of different ages, Glacier Bay, Alaska." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6676/.

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The linkages between the stream and its riparian zone have been well studied in many diverse systems on short (generally annual) timescales. No research has yet considered this in the context of longer (multi-decadal to centennial) timescales at which landscape and successional processes operate. Glacier Bay National Park and Preserve, in southeast Alaska, has a well-documented history of glacial retreat, which allows for the study of ecosystem development using a space-for-time chronosequence approach. This research was unique in analysing terrestrial invertebrates on floodplains of different

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19

Morrison, Wendy Elizabeth. "Aquatic plant-herbivore interactions across multiple spatial scales." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34734.

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For decades scientists believed that herbivory had minimal impact on freshwater ecosystems. We now know that herbivory in freshwater systems equals or exceeds herbivory in terrestrial and marine systems. In extreme cases, herbivores can change clear, macrophyte dominated ecosystems into turbid plankton dominated ecosystems. Even though research on plant-herbivore interactions in freshwater systems has increased, there is still much that is unknown. This thesis is comprised of four studies investigating freshwater plant-herbivore interactions across multiple spatial scales. The first stud

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20

Tao, Juan. "Riverine food webs and the effects of human disturbance on the contribution and quality of food sources to aquatic consumers in sub-tropical rivers." Thesis, Griffith University, 2017. http://hdl.handle.net/10072/371244.

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Understanding flows of energy and nutrients through food webs can provide important insights into mechanisms influencing the structure and function of riverine ecosystems and ecological responses to human activities. However, it is not well understood how changing land use, river impoundment and flow alteration affect the quality and quantity of food resources supporting riverine food webs. The broad aims of this thesis were to determine: (1) the effects of human disturbances on basal food sources and food quality for aquatic consumers in sub-tropical rivers in south-east Queensland (SEQ); and

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21

Fadaei, Khoei Hilda. "Measuring and Modeling the Effect of PCB Bioavailability on Accumulation in Aquatic Food Chains." Thesis, University of Maryland, Baltimore County, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10635155.

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<p> The primary goal for remediation of sediments contaminated with polychlorinated biphenyls (PCBs) is the reduction of bioaccumulation in the aquatic food web, particularly in fish that is the source of exposure to top level predators and humans. While empirical results are available in the literature on bioavailability reductions after amendment of PCB-contaminated sediment with a strong sorbent like activated carbon (AC) or biochar, there is a lack of quantitative understanding on how reductions in sediment porewater and food concentrations impact accumulation in fish. Although passive sam

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22

Burdon, Francis John. "The effects of stream productivity on aquatic-terrestrial linkages." Thesis, University of Canterbury. Biological Sciences, 2004. http://hdl.handle.net/10092/1415.

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The potential relationship between riparian arachnids and aquatic insect productivity was assessed in forest streams throughout the central South Island of New Zealand. Initially, a survey was conducted of thirty seven, first-third order forest streams. Streams were selected to represent a range of benthic invertebrate standing crops (as a surrogate measure of "productivity") from Banks Peninsula streams with relatively high benthic invertebrate densities to acid mine drainage streams near Reefton that were almost devoid of aquatic life. At each site benthic invertebrate densities and biomass

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23

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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24

Bastviken, David. "Anoxic degradation of organic matter in lakes : implications for carbon cycling and aquatic food webs /." Linköping : Univ, 2002. http://www.bibl.liu.se/liupubl/disp/disp2002/arts262s.pdf.

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25

Kelly, Barry C. "Bioaccumulation potential of organic contaminants in an Arctic marine food web /." Burnaby B.C. : Simon Fraser University, 2006. http://ir.lib.sfu.ca/handle/1892/2662.

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Thesis (Ph.D.) - Simon Fraser University, 2006.<br>Theses (School of Resource and Environmental Management) / Simon Fraser University. Senior supervisor : Dr. Frank A. P. C. Gobas. Included bibliographical references : leaves 226-248.

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26

Schorscher, Judith A. (Judith Anne). "Insect predators of larval Simulium damnosum Theobald, vector of onchocerciasis, and other Simulium species in Southern Sudan." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63254.

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27

Dodson, Jenna C. "PROTHONOTARY WARBLER NESTLING DIET AND GROWTH IN RESPONSE TO VARIATION IN AQUATIC AND TERRESTRIAL FOOD AVAILABILITY." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3969.

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Food supply has been suggested as the main determinant of reproductive success in birds. Riparian species can take advantage of seasonal pulses of both terrestrial and aquatic prey, though aquatic resources are often overlooked in studies of diet and reproductive ecology. This study investigates the flux of both aquatic (mayfly) and terrestrial (caterpillar) prey resources and nestling diet of the Prothonotary Warbler throughout the breeding season in two eastern Virginia sites. One site had significantly higher aquatic prey (mayfly) availability. Nestling diet was generally reflective of prey

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28

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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29

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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30

Rock, Amber Marie. "Carnivore identity and nutrient supply ratio constraints on carryover effects and food chain efficiency." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1511372386895159.

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31

Marshall, Melanie M. "Interactive effects of wastewater effluent on stream food webs." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1563457844184326.

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32

Thelaus, Johanna. "The aquatic microbial food web and occurence of predation-resistant and potentially pathogenic bacteria, such as Francisella tularensis." Doctoral thesis, Umeå universitet, Ekologi, miljö och geovetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1620.

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All natural aquatic systems harbour a vast variety of microorganisms. In the aquatic microbial food web, the larger microorganisms (i.e. protozoa) feed on the smaller microorganisms (i.e. bacteria and phytoplankton). An increase in nutrient availability results in changes of the microbial food web structure, like altered community composition and blooms of toxic phytoplankton. In this thesis work I hypothesised that nutrient-rich aquatic environments, with strong protozoan predation, favour the occurrence of predation-resistant bacteria like F. tularensis, and that the microbial food web may p

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33

Elshayeb, Monalisa. "Determining food web impacts on experimental aquatic systems from the disposal of oil sands process-affected waste materials." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2973.

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Current mining operators in the Athabasca oil sands deposit of Alberta, Canada have made commitments to zero discharge of oil sands process-affected waste materials (OSPM) from the mine site and rehabilitation of mined lands to a pre-mining state. As part of aquatic reclamation efforts, experimental test sites that contain a range of OSPM (solid and liquid components) were constructed to monitor the evolution and viability of aquatic habitats used as disposal sinks for OSPM produced by mining activities. In the present study, stable isotopes of carbon, nitrogen and sulphur were used to g

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34

Knopf, Klaus [Gutachter], Bernd [Gutachter] Sures, and Jasminca [Gutachter] Behrmann-Godel. "Trematodes modulate aquatic food webs by altering host feeding behaviour / Gutachter: Klaus Knopf, Bernd Sures, Jasminca Behrmann-Godel." Berlin : Humboldt-Universität zu Berlin, 2019. http://d-nb.info/1198859784/34.

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35

Weisner, Angelica. "Does Asellus aquaticus change its pigmentation when given different types of food?" Thesis, Linköpings universitet, Biologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-159762.

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When an animal’s pigmentation matches the background across various types of environments, it is potentially an example of cryptic pigmentation, most likely as a response to natural selection by visually oriented predators. One example of cryptic pigmentation is phenotypic plasticity, meaning that an organism can exhibit different phenotypes in different environments. The freshwater isopod Asellus aquaticusliving in stands of reeds tends to have darker pigmentation than individuals living amongst lighter-coloured stoneworts, which has been suggested to result from visual predation. A recent st

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36

Schmitt, Andrea V., and n/a. "The Influence of Nutrients on Aquatic Primary Production and Food Webs in Subtropical Streams of South East Queensland, Australia." Griffith University. Australian School of Environmental Studies, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20061010.135700.

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The increasing world population and with it the increased pressure on food production are likely to challenge the availability of quality fresh water resources in the near future. To compound the looming water crisis, caused by an increased demand for water available for agricultural production, the quality of our fresh water resources is also likely to suffer from the consequences of increased population pressure, i.e. urbanization of land and growth of industries, and food production, i.e. agricultural use of land. Moreton Bay, South East Queensland, Australia, is listed under the United Nat

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Schmitt, Andrea V. "The Influence of Nutrients on Aquatic Primary Production and Food Webs in Subtropical Streams of South East Queensland, Australia." Thesis, Griffith University, 2005. http://hdl.handle.net/10072/367645.

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The increasing world population and with it the increased pressure on food production are likely to challenge the availability of quality fresh water resources in the near future. To compound the looming water crisis, caused by an increased demand for water available for agricultural production, the quality of our fresh water resources is also likely to suffer from the consequences of increased population pressure, i.e. urbanization of land and growth of industries, and food production, i.e. agricultural use of land. Moreton Bay, South East Queensland, Australia, is listed under the United Nat

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Blythe, Demitra E. "Assessing the Ecological Implications of the Altered Flow and Sediment Regimes of the Rio Grande Along the West Texas-Mexico Border." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7358.

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Large, exotic (those whose headwaters are in distant places) rivers are some of the most unique and diverse ecosystems on earth. Because they often flow through a multitude of biomes and climates, their waters are a vital resource not only for the organisms that inhabit these rivers, but for human societies as well. Thus, large rivers, like the Rio Grande, that flow through arid and agricultural regions are highly regulated and diverted. Regulation and dewatering upset a river’s natural flow regime (e.g., magnitude, duration, timing of large flood events), subsequently impacting the river’s ab

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Bowe, Kelsey Lyn. "USE OF ADULT ANURAN COMMUNITIES AND DIETS TO ASSESS THE EFFECTS OF STREAM RESTORATION ON AQUATIC TO TERRESTRIAL FOOD WEB SUBSIDIES." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2607.

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The boundaries between freshwater and terrestrial ecosystems can be areas of important subsidy transfers. These subsidies, such as leaf litter inputs to streams or aquatic emerging insects into riparian zones, link food webs and provide benefits to consumers in the form of nutrients and energy. Subsidies from aquatic systems tend to have high levels of essential long chain polyunsaturated fatty acids (LC-PUFAs), such as eicosapentaenoic acid (EPA; 20:5n-3) and docosahexaenoic acid (DHA; 22:6n-3) that are only produced by certain forms of aquatic algae. These LC-PUFAs are highly important in gr

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Devlin, Shawn P. "Littoral zone structure, energy mobilization and benthic food webs in oligotrophic northern temperate lakes." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1303154171.

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41

Grange, Neil. "The influence of contrasting freshwater inflows on the feeding ecology and food resources of zooplankton in two eastern Cape estuaries, South Africa." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005400.

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The trophodynamic implications of reduced freshwater inflow on the zooplankton of eastern Cape estuaries was investigated by a comparison of the community composition and standing stocks, grazing rates and food resources of zooplankton in two systems, the Kariega and the Great Fish estuaries, which are subject to contrasting freshwater inflow. The climate of South Africa is semi-arid, and the low rainfall, coupled with high evaporative loss, result in the region having one of the lowest conversions of rainfall to run-off in the world. In addition, many of the major rivers are extensively impou

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Dang, Viet D. "Achiral and chiral analysis of polychlorinated biphenyls (PCBs) in the aquatic and riparian food webs in Twelve Mile Creek, South Carolina." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202410243/.

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43

Morales, Ernesto J. "Self-recruiting species in farmer managed aquatic systems : their importance to the livelihoods of the rural poor in Southeast Asia." Thesis, University of Stirling, 2007. http://hdl.handle.net/1893/250.

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The self-recruiting species (SRS) are aquatic animals that can be harvested regularly from a farmer managed system without regular stocking as described by Little (2002a, b). The potential and current role of self-recruiting species from farmer managed aquatic systems (FMAS) is often overlooked, whilst much attention has been given to stocked species (often associated in conventional culture ponds and cages) as well as the fisheries sector (often relates to large water bodies i.e. river lakes and reservoirs). Using the combination of qualitative and quantitative research approaches, the curren

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Hlungwani, Hlulani Archebold. "Impact of oncorhynchus mykiss, salmo trutta and clarias gariepinus on aquatic communities within Magoebaskloef Area, Limpopo Province, South Africa." Thesis, University of Limpopo, 2016. http://hdl.handle.net/10386/1573.

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Thesis (M. Sc. (Agriculture)) -- University of Limpopo, 2016<br>Fish assemblages in relation to environmental variables within the Broederstroom and Debengeni Rivers were investigated. Both rivers were characterized by coarse substrates (pebble and gravel), temperatures below 20°C and moderate depth. Trout dominated fish assemblages in terms of numbers caught and was only distributed at higher altitude sites >1400 m (a.s.l). Coarse substrates, temperatures below 15°C, flow rate, depth and riparian cover were the variables shown important for the distribution of trout by multivariate analysis.

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Becker, Allison L. "Aquatic insects as an energetic subsidy to riparian consumers in the Olman River Basin, Alberta." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences, c2012, 2012. http://hdl.handle.net/10133/3315.

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Freshwater and terrestrial ecosystems are connected through biomass exchanges such as the flow of predators, prey, nutrients and detritus between them. Emerging aquatic insects provide an alternate food source to riparian consumers often termed an allochthonous subsidy. Stable isotope analyses of naturally occurring carbon and nitrogen is effective for tracing energetic food sources to consumers. This thesis evaluated whether stable isotope analysis would be effective in the Oldman River Basin, Alberta. Aquatic and riparian primary consumers are distinct in their isotopic signatures and v

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Klobucar, Stephen L. "The Abiotic and Biotic Controls of Arctic Lake Food Webs: A Multifaceted Approach to Quantifying Trophic Structure and Function." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7293.

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The Arctic is warming faster than any other region of the globe. To conserve and manage many thousands of lakes across arctic landscapes, scientists need to understand historic and present conditions within these lakes to predict how the lakes, and the organisms that inhabit them, may respond to a changing climate. The goal of my research was to improve our understanding of what physical, chemical, and biological factors contribute to: 1) how lake food webs are assembled; and, 2) how these food webs may change in the future. First, I used long-term observations and lab experiments to determine

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Young, Matthew Parham. "FATTY ACIDS AS INDICATORS OF NUTRITIONAL HISTORY OF CHANNEL CATFISH (ICTALURUS PUNCTATUS) AND AQUATIC FOOD WEBS IN THE KASKASKIA RIVER SYSTEM OF ILLINOIS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/938.

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The use of fatty acid (FA) analysis has become an important tool in recent years to investigate a broad spectrum of questions in fisheries and aquatic ecology. One of these applications has been the use of FA profiles as biomarkers for indicating diet and recent feeding history of fishes and other aquatic consumers. Differences in forage FA profiles and spatial differences in food web structure within aquatic systems may lead to corresponding spatial patterns of FA profiles in consumers, thereby facilitating the potential applicability of FA biomarkers as indicators of habitat use and origin

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Meyer, Lars Alan. "In Light of Energy: Influences of Light Pollution on Linked Stream-Riparian Invertebrate Communities." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345479410.

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Häubner, Norbert. "Dynamics of astaxanthin, tocopherol (Vitamin E) and thiamine (Vitamin B1) in the Baltic Sea ecosystem : Bottom-up effects in an aquatic food web." Doctoral thesis, Uppsala universitet, Ekologisk botanik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-130143.

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The thesis combines laboratory experiments and field expeditions to study production, transfer and consumption of non-enzymatic antioxidants and thiamine in an aquatic food web. In particular, I (1) documented spatial and seasonal variation of tocopherols and carotenoids in the Baltic Sea pelagic food web, and (2) examined the effects of abiotic and biotic factors on tocopherol, carotenoid and thiamine concentrations in phytoplankton, zooplankton and fish. Moderate differences in temperature and salinity affected α-tocopherol, β-carotene and thiamine production in microalgae. Furthermore, the

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Cifuentes, de Gramajo Luisa. "Nejayote produced at household level by Mayan women in Guatemala : is it a threat to aquatic ecosystems or a resource for food security?" Thesis, Högskolan Kristianstad, Sektionen för lärande och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-8557.

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The aim of this study was to find out if nejayote produced at household level in Guatemala represents a threat to aquatic ecosystems and, if so, propose sustainable processing, reuse and disposal methods. First, all aspects related to nejayote production were explored. This study presents combined results from literature study on corn consumption and Guatemalan demography, a survey to Guatemalan women of all ethnical groups, nixtamalization replica and solids removal experiments and laboratory analysis. Findings indicate that the source of nejayote are approximate 600 000 tones of corn nixtama

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