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Tesi sul tema "Predators"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Garza, Mark Isaac. "Predator induced defenses in prey with diverse predators." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3309.

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Phenotypic plasticity is an environmentally based change in phenotype and can be adaptive. Often, the change in an organism's phenotype is induced by the presence of a predator and serves as a defense against that predator. Defensive phenotypes are induced in freshwater physid snails in response to both crayfish and molluscivorous fish. Alternative morphologies are produced depending on which of these two predators snails are raised with, thus protecting them from each of these predators' unique mode of predation. Snails and other mollusks have been shown to produce thicker, differently shaped

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2

Lourenço, Rui Nascimento Fazenda. "Predatory interactions among vertebrate top predators superpredation and intraguild predation by large raptors." Doctoral thesis, Universidade de Évora, 2011. http://hdl.handle.net/10174/14789.

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Nesta tese estudaram-se as interacções predatórias entre vertebrados predadores de topo (predação intraguilda e superpredação), utilizando quatro aves de rapina de grande porte como modelos de superpredadores: Bufo-real, Açor, Águia-real, e Águia de Bonelli. A superpredação em aves de rapina é um fenómeno abrangente, que pode variar entre espécies, e mais frequente em paisagens mais humanizadas. Os meso-predadores não são recursos energeticamente relevantes para as aves de rapina, e o seu consumo está associado à diversificação da dieta resultante da diminuição das presas habituais. A eliminaç

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3

Vankeuren, Jody L. "Parasites Predators and Symbionts." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1619475426952694.

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4

Howe, Jeff. ""Predators" a short story collection." Thesis, Boston University, 2012. https://hdl.handle.net/2144/32025.

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Thesis (M.F.A.)--Boston University. Please note: creative writing theses are permanently embargoed in OpenBU. No public access is forecasted for these. To request private access, please click on the locked Download file link and fill out the appropriate web form.<br>2031-01-02

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5

Sitvarin, Michael Ian. "Behavioral and ecological consequences of multiple intraguild predators and connections between predators, prey, and ecosystem function." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1408538928.

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6

Lannsjö, Fredrik, Lionel Nurweze, and Kristina Sörensen. "Modeling the Dynamics of Cooperative Predators." Thesis, KTH, Optimeringslära och systemteori, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103624.

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The focus of this thesis is the modeling of cooperative predators hunting ocks of animals. The modeling is based on biological studies of the behavior of speci c predators and their preys, lions and zebras for this case. General rules are established in order to model the overall hunting and escape strategies, with a focus on the former. The dynamics of the predator during the hunt are modeled using the unicycle model applied locally, i.e., applied to each agent. The cooperation is taken into account by considering the system as a multi-agent system. Subsequently, a computer simulation based o

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7

Jones, Esther Lane. "Spatial ecology of marine top predators." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12278.

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Species distribution maps can provide important information to focus conservation efforts and enable spatial management of human activities. Two sympatric marine predators, grey seals (Halichoerus grypus) and harbour seals (Phoca vitulina), have overlapping ranges but contrasting population dynamics around the UK; whilst grey seals have generally increased, harbour seals have shown significant regional declines. A robust analytical methodology was developed to produce maps of grey and harbour seal usage estimates with corresponding uncertainty, and scales of spatial partitioning between the sp

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8

Wilson, Rory Paul. "Breeding Jackass Penguins as pelagic predators." Doctoral thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/17653.

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Bibliography: pages 187-191.<br>The foraging of breeding Jackass Penguins Spheniscus demersus was studied in and around southwestern Cape Province, Saldanha Bay (33⁰ S, 18⁰ E), South Africa. Penguins are difficult to observe at sea. Hence, I devised a number of new techniques for studying the foraging behaviour of Jackass Penguins at sea. I built electronic and autoradiographic remote-sensing devices to measure swimming speed, distance travelled and time spent at each depth by foraging Jackass Penguins. Penguin swimming speed was reduced in proportion to the cross-sectional area of the devices

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9

Ddumba, Hassan. "Repulsive-attractive models for the impact of two predators on prey species varying in anti-predator response." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/d1010995.

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This study considers the dynamical interaction of two predatory carnivores (Lions (Panthera leo) and Spotted Hyaenas (Crocuta crocuta)) and three of their common prey (Buffalo (Syncerus caffer), Warthog (Phacochoerus africanus) and Kudu (Tragelaphus strepsiceros)). The dependence on spatial structure of species’ interaction stimulated the author to formulate reaction-diffusion models to explain the dynamics of predator-prey relationships in ecology. These models were used to predict and explain the effect of threshold populations, predator additional food and prey refuge on the general species

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10

Cox, Martin James. "Acoustic and ecological investigations into predator-prey interactions between Antarctic krill (Euphausia superba) and seal and bird predators." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/579.

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11

Madeira, Nogueira Filipe. "Movement of predators in arable crop systems." Doctoral thesis, Universitat de Lleida, 2014. http://hdl.handle.net/10803/285265.

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L`abundància i dispersió d`O. majusculus no va ser diferent entre parcel-les de panís amb moderadament alta o baixa densitat de males herbes. Els caràbids, C. fuscipes, P. rufipes, P. cupreus i Metallina sp. i l`antocòrid O. majusculus presenten moviment bidireccional entre cultius adjacents de alfals i panís durant l'estació. En contrast, C. septempunctata només es va moure des de l`alfals cap al panís. Els individus d'O. majusculus i C. septempunctata que van colonitzar el panís a l'estadi vegetatiu provenien de l`alfals, indicant que l`alfals va ser la font d'aquests depredadors. No obstant

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12

Nogueira, Madeira Filipe José. "Movement of predators in arable crop systems." Doctoral thesis, Universitat de Lleida, 2014. http://hdl.handle.net/10803/285265.

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L`abundància i dispersió d`O. majusculus no va ser diferent entre parcel-les de panís amb moderadament alta o baixa densitat de males herbes. Els caràbids, C. fuscipes, P. rufipes, P. cupreus i Metallina sp. i l`antocòrid O. majusculus presenten moviment bidireccional entre cultius adjacents de alfals i panís durant l'estació. En contrast, C. septempunctata només es va moure des de l`alfals cap al panís. Els individus d'O. majusculus i C. septempunctata que van colonitzar el panís a l'estadi vegetatiu provenien de l`alfals, indicant que l`alfals va ser la font d'aquests depredadors. No obstant

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13

Van, Gijn Evianne Laetitia. "The grooming process of internet sexual predators." Thesis, University of Cambridge, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708867.

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14

London, Josh M. "Harbor seals in Hood Canal : predators and prey /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5394.

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15

Brown, S. L. "Predators and fisheries : an ecological evaluation of conflict." Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516865.

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16

Broadbent, Heather. "A CTD Biotag for Mid-sized Marine Predators." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/3992.

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Biologging tools for investigating the study of fine-scale linkages between animal behavior and the physical microstructure of the marine habitat are technically limited by substantial size, high cost or low sensor resolution. However, recent advances in electronic technologies and process techniques present attractive alternatives to current tag designs. Motivated by the need for a low-cost, compact CTD biotag for medium-sized marine animals, the University of South Florida Center for Ocean Technology developed a multi-sensor biotag for quantitative measurements of ocean salinity. This dis

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17

Jiang, Bin [Verfasser]. "Predators promote trait diversification in prey / Bin Jiang." Berlin : Freie Universität Berlin, 2018. http://d-nb.info/1169832156/34.

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18

Glanville, Philip William. "Computer simulation of protective coloration with human predators." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243173.

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19

Klepac, Petra. "Interacting populations : hosts and pathogens, prey and predators." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38995.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 2007.<br>Includes bibliographical references.<br>The interactions between populations can be positive, neutral or negative. Predation and parasitism are both relationships where one species benefits from the interaction at the expense of the other. Predators kill their prey instantly and use it only for food, whereas parasites use their hosts both as their habitat and their food. I am particularly interested in microbial parasites (including bacteria, fungi, viri, and some protozoans) since they cause many infectious dis

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20

Davey, Jeffrey Stewart. "Intraguild predation among generalist predators in winter wheat." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/55042/.

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Modern annual arable crops are susceptible to outbreaks of pests due mainly to the uniform habitats that agricultural fields represent. Cereals are particularly prone to infestations of aphids, which may damage the crop directly through herbivory, or indirectly by acting as vectors of disease. These insects, however, have a large range of invertebrate natural enemies, which under certain circumstances, can maintain infestations below economically damaging levels. Greater habitat complexity at landscape and farm scale usually leads to more diverse assemblages of natural enemies at the field sca

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21

Hamdy, Ronald C., J. V. Lewis, Rebecca Copeland, et al. "Patients With Dementia Are Easy Victims to Predators." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/1236.

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Patients with dementia, especially Alzheimer’s disease and particularly those in early stages, are susceptible to become victims of predators: Their agnosia (see Case 1) prevents them from detecting and accurately interpreting subtle signals that otherwise would have alerted them that they are about to fall for a scam. Furthermore, their judgment is impaired very early in the disease process, often before other symptoms manifest themselves and usually before a diagnosis is made. Patients with early stages of dementia are therefore prime targets for unscrupulous predators, and it behooves careg

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22

Li, Yunhe. "Ecological risks of insecticidal transgenic crops on arthropod predators /." [S.l.] : [s.n.], 2009. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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23

Croy, Marion Isobel. "Characteristics of learning associated with feeding in marine predators." Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236351.

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24

Meredith, Anna Louise. "Evaluation of predators as sentinels for emerging infectious diseases." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/6480.

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New and emerging diseases in human and animal populations appear to be predominately associated with generalist pathogens that are able to infect multiple hosts. Carnivores are susceptible to a wide range of these pathogens and can act as effective samplers of their vertebrate prey, which are important reservoirs of many emerging diseases. This thesis evaluates the utility of carnivores as sentinels for pathogens present in their prey by exploration of four selected pathogen-prey-sentinel combinations in three rural study sites of varying habitat in northern England and Scotland over a twenty-

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25

Parr, Raymond Arthur. "Moorland birds and their predators in relation to afforestation." Thesis, University of Aberdeen, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282068.

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The breeding bird assemblages of blanket bog and moorland habitats in the United Kingdom are of special international importance. They are characterised by species drawn from arctic to temperate regions breeding at high density and showing a particular affinity for open, in parts waterlogged, grazed and burned landscapes. Much recent debate has focussed on the effects of conifer plantations on the distribution and breeding success of these birds. This study concentrates on differences in breeding distribution and success of selected moorland birds. On blanket bog in Caithness and on heather mo

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26

Carter, Stephen Paul. "Habitat refuges and the management of predators for conservation." Thesis, Royal Holloway, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269793.

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27

Thomas, Matthew Brian. "Manipulation of overwintering habitats for invertebrate predators on farmland." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316454.

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28

Edwards, Francois K. "Fish presence and the ecology of stream invertebrate predators." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/14773.

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This thesis describes the ecology of invertebrate predators (Plecoptera and Trichoptera) across steams, some without fish. Focusing primarily on stoneflies of the families Perlidae and Perlodidae, I studied the density and diversity of predators and the invertebrate prey, predator diet, size-mass relationships and microhabitat use. The abundance of invertebrate predators varied across streams and seasons but numbers of predatory invertebrates did not differ with fish presence. Only the smallest species of invertebrate predator was more abundant in substrate complexes in streams with fish. Over

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29

Jackson, Kelly. "Variable Consequences of Toxic Prey on Generalist Insect Predators." UKnowledge, 2016. http://uknowledge.uky.edu/entomology_etds/29.

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Introduced species, like the lady beetle Harmonia axyridis, have been linked to declines of native species through mechanisms including intraguild predation and competitive superiority. However, competitive differentials between species may be mitigated if subdominant species can utilize resources that dominant species cannot. Previous research has shown that some strains of the aphid Aphis craccivora are toxic to H. axyridis. My goal was to investigate use of this resource by both H. axyridis and other lady beetles, to determine whether these aphids might be an exploitable resource for subdom

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30

Basson, Marinelle. "Population dynamics of krill interactions with its major predators." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47352.

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31

Aratchige, Nayanie Samantha. "Predators and the accessibility of herbivore refuges in plants." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2007. http://dare.uva.nl/document/45176.

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32

Flowers, Robbie Wayne. "Competitive interactions among two specialist predators and a generalist predator of hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae)." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/26932.

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Competitive interactions among two specialist predators, <i>Laricobius nigrinus</i> Fender (Coleoptera: Derodontidae) and <i>Sasajiscymnus tsugae</i> Sasaji and McClure (Coleoptera: Coccinellidae), and a generalist predator, <i>Harmonia axyridis</i> Pallas (Coleoptera: Coccinellidae), of hemlock woolly adelgid were evaluated using laboratory, field and video studies. The two specialist predators are part of a biological control program for <i>A. tsugae</i>, and the potential for competition among these species and previously established generalist predators is unknown. In laboratory studies o

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33

Malan, G., N. Seoraj-Pillai, and Plessis MA du. "Alarm calls of Bronze Mannikins communicate predator size to familiar conspecifics." Taylor & Francis, 2009. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001767.

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Summary This paper investigates, through experiments using surrogate predators, differences in intraspecific alarm calls between familiar and unfamiliar Bronze Mannikin Spermestes cucculatus groups. Four groups of mannikins were captured with mist nets from four areas in Durban (i.e. original groups) and randomly mixed (i.e. assorted groups). These groups were exposed to latex terrestrial snakes and mounted aerial raptors, and their alarm calls and predator response behaviours recorded. The Bronze Mannikins were able to discriminate between predators of different sizes, and increased their cal

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34

Cook-Sourice, Catherine. "The glass machinery in Christopher Dewdney's Predators of the adoration." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0006/MQ43524.pdf.

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35

Hill, Simeon. "Search strategies of benthic predators : an experimental and modelling study." Thesis, Bangor University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245183.

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36

Pickup, Zoe Lynette. "The relationship between potential bacterial pathogens and their amoebic predators." Thesis, Lancaster University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497151.

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The ecological relationships between amoebae and their bacterial prey has been sparsely investigated. Although these relationships are highly pertinent to the enfierging role played by protozoa in harbouring pathogenic bacteria, research has focussed largely on post-infection genetic and nfiolecular events within the protozoan cell. The v\/ork in this thesis aimed to throw light on the processes taking place prior to such events and the influencing factors. Amoebae are largely surface-dwellers, thus natural or man-made mixed bacterial biofilms where amoebae may be the principle predators, prov

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37

Dixon, Claire Marie. "Investigation of phagosomal compartments and prey digestion in protozoan predators." Thesis, Lancaster University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551660.

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Protozoan grazing is commonly recognised as a major factor in shaping the structure and composition of bacterial communities. However, the complexity in the relationship between these predators and their prey means that ingestion of bacteria is not always coupled with complete digestion. A large number of factors are thought to be involved in determining the outcome of an ingestion event, and is highlighted by the fact that there is a large amount of inconsistency in the literature regarding the digestibility of prey types. Protozoan phagosome processing is poorly understood - which in turn ma

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38

Ayre, Kevin. "Evaluation of carabids as predators of slugs in arable land." Thesis, University of Newcastle Upon Tyne, 1995. http://hdl.handle.net/10443/946.

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An Enzyme-Linked Immunosorbent Assay (ELISA) was developed which detected slug antigens in postmortem gut analysis of carabid beetles. The ELISA was used to identify beetles which fed on slugs in three fields of oilseed rape and winter wheat in the Tyne valley, Northumberland. Generalist species such as Harpalus rufipes, Pterostichus melanarius, Pterostichus nladidus, Anlara silnilata and Nebria brevicollis fed on slugs in the field. Molluscan specialists such as Carabus violaceus and Cychrus caraboides also fed on slugs in the field. Laboratory studies indicated that many large and medium siz

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39

Roy, Helen Elizabeth. "Interactions between aphid predators and the entomopathogenic fungus Erynia neoaphidis." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362048.

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Harding, Nigel John. "The evolution of predators and their prey : a theoretical study." Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315075.

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41

Hörnfeldt, Birger. "Cycles of voles, predators, and alternative prey in boreal Sweden." Doctoral thesis, Umeå universitet, Ekologi och geovetenskap, 1991. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-100711.

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Bank voles, grey-sided voles, and field voles had synchronous 3-4 year density cycles with variable amplitudes which averaged about 200-fold in each species. Cycles of vole predators (red fox and Tengmalm's owl), and their (foxes') alternative prey (mountain hare and forest grouse) lagged behind the vole cycles. The nomadic Tengmalm's owl responded with a very rapid and strong numerical increase to the initial cyclic summer increase of voles (the owl’s staple food). Owl breeding densities in the springs were highly correlated with vole supply in the previous autumns. This suggested that the nu

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42

Melin, Jerker. "Phenotypic plasticity of blue mussels under threat from different predators." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-316376.

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My study confirms that there are phenotypic plastic traits in blue mussels (Mytilus edulis) inresponse to predatory pressure from shore crabs (Carcinus maenas) and sea stars (Asteriasrubens) and a combination of them. Blue mussels can sense predators by olfactory cues fromthe predators themselves, or by alarm cues from attacked conspecifics, and then developinducible defences. In this experimental study, blue mussels were exposed to either nopredator (control) or to enclosed predators in terms of two shore crabs, two sea stars or thecombination of one shore crab and one sea star, over a period

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43

Blake, Michael A. "Defence against predators by juvenile signal crayfish (Pacifastacus leniusculus, Dana)." Thesis, University of Leicester, 1993. http://hdl.handle.net/2381/34156.

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This study investigated the defensive responses of juvenile signal crayfish (Pacifastacus leniusculus, Dana) to two putative predators, perch (Perca fluviatilis, L.) and eel (Anguilla anguilla, L.), and attempted to determine the Importance of direct and indirect predatory effects on the distribution of newly independent Juvenile crayfish in a Swedish pond. Eels are thought to be more detrimental to crayfish populations than perch. Experiments using juvenile crayfish did not support this assertion. Visual and chemical stimuli elicited crayfish avoidance behaviour. This was most marked when bot

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44

Stake, Mike M. "Golden-cheeked warbler nest predators and factors affecting nest predation /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p1418066.

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45

Torija, Jimenez Pablo Enrique. "Econometrics of vice: Idle students, partisan prosecutors and environmental predators." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423445.

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This thesis is organized in three clearly differentiated chapters. The three of them deal with currently relevant issues: The effect of low-quality of standardized tests on research, the high levels of political corruption in Spain and the collective capacity of tackle climate change. In the first chapter “Straightening PISA: When Students do not Want to answer Standardized Tests”, I study one of the key elements on current education policies: The standardized-tests. Concretely, I analyze how students approach standardized tests in different ways. I use a measure of effort exerted by students

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Mella, Valentina S. A. "Physiological and behavioural responses of Australian and exotic prey to the scent of native and introduced predators." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/350.

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This study examined the physiological and behavioural effects of a stress-inducing stimulus (predator odour) on potential prey species (Australian native and exotic). The aim was to determine if differences in the response of prey were related to the scent of evolutionary known predators compared to unfamiliar or short-term introduced ones. In laboratory experiments, responses were always restricted to changes in respiratory variables, with brushtail possums (Trichosurus vulpecula), rabbits (Oryctolagus cuniculus) and tammar wallabies (Macropus eugenii) showing no variation in metabolic rate a

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47

Guilford, T. "Aposematism." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382678.

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48

Kelly, D. W. "The role of native and invasive amphipods (Crustacea) in freshwater communities." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390875.

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49

Coombes, D. S. "Factors limiting the effectiveness of Demetrias atricapillus (L.) (Coleoptera: Carabidae) as a predator of cereal aphids." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376159.

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50

Smee, Delbert Lee. "The Ecology of Yikes! Environmental Forces Alter Prey Perception of Predators." Diss., Connect to this title online, 2006. http://etd.gatech.edu/theses/available/etd-05082006-213823/.

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Abstract (sommario):

Thesis (Ph. D.)--Georgia Institute of Technology, 2006.<br>Title from PDF t.p. (viewed on Oct. 28, 2006). Marc Weissburg, Committee Chair ; Mark Hay, Committee Member ; Lin Jiang, Committee Member ; David Dusenbery, Committee Member ; Don Webster, Committee Member. Includes bibliographical references (p. 115-122).

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