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Dissertations / Theses on the topic 'Guppies'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

Crispo, Erika. "Factors influencing gene flow in guppies." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82212.

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Two processes may lead to genetic divergence among populations. One is mediated by geography, whereby physical barriers and geographic distance limit gene flow among populations, resulting in divergence due to drift or mutation. Another is ecological speciation, whereby populations adapt to their local environments via natural selection, and gene flow is impeded by selection against dispersers in favor of adapted residents. I used natural populations of guppies (Poecilia reticulata) to determine the relative influence of these two processes in the structuring of populations. If geograph

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2

McKellar, Ann. "Environmental factors influencing adult sex ratio in guppies." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21953.

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Adult sex ratio is an important demographic characteristic that can affect population dynamics and behavioural processes, yet the causes of natural sex ratio variation are often uncertain. In the Trinidadian guppy (Poecilia reticulata), considerable variation in adult sex ratio has been documented, despite 1:1 sex ratios at birth. Sex-biased mortality is likely responsible for this pattern, and reasonable mechanisms include predation and resource limitation. Using field sampling techniques, I found that adult sex ratio in wild guppy populations was associated with predators and resource levels

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3

Lundin, Erik. "Time and speed dependency of swimming bursts in guppies." Thesis, Uppsala universitet, Tillämpad matematik och statistik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325583.

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4

Sheridan, Letitia Anne Devoy. "Sexual selection symmetry, inbreeding and mate choice in Trinidadian guppies." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263266.

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5

Macario, Alessandro. "Ontogenetic environments and female mate choice in guppies, Poecilia reticulata." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14288.

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Theoretical models of sexual selection assume that female mating preferences are fixed and variation found between individuals resulting solely from allelic variation at specific loci coding for sexual preferences. For the last decade, an increasing number of studies have demonstrated that individual phenotypic variation in preferences was common across a wide range of taxa and induced by the environmental context and the females’ condition. Further, developmental stages of life are crucial in the formation of behaviours in general and have proven to be determinant to learn sexual preferences

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6

Borner, Karoline. "Influence of turbidity on social structure in guppies, Poecilia reticulata." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17622.

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Umweltveränderungen kommen natürlicherweise vor und viele Spezies waren im Laufe ihrer Evolutionsgeschichte davon betroffen. Durch die Aktivitäten des Menschen jedoch finden diese in höherer Geschwindigkeit und größerem Umfang statt und stellen so für viele Spezies eine neue Herausforderung dar. Einen großen Einfluss auf die Umwelt nimmt der Mensch durch Verschmutzung, welche zu Veränderungen der Physiologie der Organismen und deren Verhalten führen und damit Einfluss auf die Populationsdynamik und letztendlich auf die Biodiversität haben kann. In meiner Dissertation untersuchte ich den Einfl

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7

Chettri, Jiwan Kumar. "Tetrahymena sp. infection in guppies, Poecilia reticulata : immunization and treatment development /." [Sedeh Boker, Israel] : Ben-Gurion University of the Negev, 2008. http://aranne5.lib.ad.bgu.ac.il/others/ChettriJiwanKumar.pdf.

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8

Walz, Julia C. "Behavioral and hormonal flexibility across light environments in guppies (Poecilia reticulata)." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1290.

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Behavior may be dramatically influenced by changing environments, and differences in light intensity environments may have important behavioral consequences. One approach to understanding changes in behavior is by studying behavioral syndromes, suites of correlated behaviors reflecting between individual consistencies in behavior expressed within a behavioral situation (e.g., correlations between antipredator behaviors in different habitats), or across behavioral contexts (e.g., correlations among feeding, antipredator, or mating behavior) (Sih et al. 2004a). Guppies (Poecilia reticulata) prov

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9

Deacon, Amy E. "The behavioural ecology of the Trinidadian guppy, Poecilia reticulata, as an invasive species." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1689.

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This thesis focuses on the guppy, Poecilia reticulata, as an invasive species. Its non-native distribution, the biology behind its success and the reasons for its introduction are examined. A worldwide email survey revealed that the guppy is established in at least 73 countries outside of its native range and that mosquito control schemes and the release of unwanted aquarium fish are the two primary routes of introduction. Knowledge gaps were identified; primarily the scarcity of scientific evidence for negative impacts of guppy introductions and similarly for mosquito control efficacy. Replic

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10

Eckerström, Liedholm Simon. "Brain size does not affect reproductive behaviour in male guppies (Poecilia reticulata)." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-233401.

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The processes and mechanisms that govern brain size evolution remain a widely discussed topic in evolutionary biology. How relative brain size relates to animal behaviour and cognition is even more controversial. Recent comparative and experimental studies have shown a positive relationship between relative brain size and complexity of behaviour. Some of the most important behaviours that have direct consequences for an individual’s fitness are reproductive behaviours, and they sometimes require quite complex behavioural repertoires. Selection for complex behaviour might therefore induce an ex

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11

Barbosa, Miguel. "Female mating decisions in the Trinidadian guppy, Poecilia reticulata." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/767.

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12

Calvo, Ester. "Effects of pharmaceuticals on fishbehavior : Oxazepam impact on social preferences and responses onpredation risk (olfactory cue mixture) in guppies." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-126098.

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Effects of oxazepam concerning on social behavior in guppies are still unknown. The purpose ofthis thesis is to investigate if the benzodiazepine oxazepam has effects on fish behavior in terms ofsocial preferences and responses to predation risk using an olfactory cue mixture. After anexposure period of 15 days to 100 μg/l of oxazepam, behavioral experiments were performed overtwo days. Results indicate that oxazepam exposed fish were more social at the beginning of theexperiment, which differ from what was expected and from previous social preferences studies.Moreover, less social behavior wa

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13

Millar, Nathan Peter. "The influence of habitat and the visual systems of predators on the evolution of male colour in guppies, Poecilia reticulata /." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99191.

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The colour of guppies (Poecilia reticulata) evolves as a compromise between sexual selection (favouring conspicuousness) and natural selection (favouring crypsis). However, guppies live in a variety of habitats and with a variety of predators and consequently in a variety of selective environments. I investigated how habitat and predator's visual systems affect the evolution of colour. I used regressions to assess the importance of habitat features on the evolution of colour for 29 guppy populations. I then quantified the colour of guppies living in the presence and absence of two predators. T

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14

Gonçalves, Bruno Bastos. "Efeitos de herbicida à base de glifosato em aspectos reprodutivos de guppies (Poecilia reticulata) /." Jaboticabal, 2017. http://hdl.handle.net/11449/151033.

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Orientador: Percilia Cardoso Giaquinto<br>Ana Carolina Kiss<br>Marisa Fernandes de Castilho<br>Thiago Lopes Rocha<br>Resumo: A população humana cresce em proporções maiores que a produção de alimentos. Nesse cenário, a agricultura potencializa este cultivo por meio do uso de defensivos agrícolas, como por exemplo, herbicidas à base de glifosato (HBG). Entretanto, tais produtos possuem vários efeitos adversos em organismos não-alvos, como peixes. Estudos apontam danos em tecidos e em material genético de peixes, porém, não há estudos sobre o comportamento reprodutivo dessa espécie quando expost

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15

Gonçalves, Bruno Bastos [UNESP]. "Efeitos de herbicida à base de glifosato em aspectos reprodutivos de guppies (Poecilia reticulata)." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151033.

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Submitted by BRUNO BASTOS GONÇALVES null (goncalves.b.b@gmail.com) on 2017-06-28T21:57:21Z No. of bitstreams: 1 Tese v7.pdf: 1743616 bytes, checksum: 7c171df4f861986ef9acdec88235f353 (MD5)<br>Rejected by Luiz Galeffi (luizgaleffi@gmail.com), reason: Solicitamos que realize uma nova submissão seguindo a orientação abaixo: O arquivo submetido está sem a ficha catalográfica. A versão submetida por você é considerada a versão final da dissertação/tese, portanto não poderá ocorrer qualquer alteração em seu conteúdo após a aprovação. Corrija esta informação e realize uma nova submissão

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16

Gheorghiu, Cristina. "Concentration-dependent effects of waterborne zinc on the interactions between Gyrodactylus turnbulli (Monogenea) and the guppy (Poecilia reticulata)." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102979.

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This research investigated the effects of waterborne zinc (Zn) on the interactions between guppies, Poecilia reticulata (Peters), and Gyrodactylus turnbulli Harris, 1986, a monogenean parasite of its skin and fins. The first objective was to determine if sublethal concentrations of waterborne Zn (up to 240 mug/L added to artificial freshwater) exerted a concentration-dependent effect on the population dynamics of Gyrodactylus on isolated guppies. Whereas survival of uninfected fish was unaffected, mortality of infected fish increased linearly with increasing Zn concentration. In addition, the

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17

Bleakley, Bronwyn H. "Indirect genetic effects of social environment influence the expression of antipredator behavior in guppies, Poecilia reticulata." [Bloomington, Ind.] : Indiana University, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3277974.

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Thesis (Ph.D.)--Indiana University, Dept. of Biology, 2007.<br>Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 5787. Adviser: Edmund D. Brodie, III. Title from dissertation home page (viewed May 9, 2008).

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18

Shenoy, Kausalya. "THE ECOLOGICAL AND EVOLUTIONARY EFFECTS OF ENDOCRINE DISRUPTING COMPOUNDS ON SEXUALLY SELECTED TRAITS IN MALE GUPPIES." UKnowledge, 2012. http://uknowledge.uky.edu/biology_etds/26.

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Male mating signals convey important mate-quality information to females and are regulated by androgens. Endocrine disrupting compounds (EDCs) are chemicals that interfere with proper hormonal functioning in exposed animals, causing altered hormone levels and resulting in changed reproductive characteristics, including mating signals. Altered signals can have ecological implications by influencing population and community dynamics and evolutionary implications via trans-generational reduction in signal reliability leading to reduced preference and eventual loss of the signal trait. I examined

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19

Weetman, David William. "An experimental investigation of temperature and predator-induced phenotypic plasticity in Daphnia spp. and guppies, Poecilia reticulata." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367978.

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20

Field, Kristin L. "Effects of sex ratio on ontogeny of sexual behavior and mating competence in male guppies, poecilia reticulata." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1091578035.

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21

Schwartz, Amy K. "Divergent natural selection and the parallel evolution of mating preferences : a model and empirical test for the origins of reproductive isolation." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82432.

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Ecological speciation involves the evolution of reproductive isolation (RI) as a by-product of adaptation to different selective environments. Parallel patterns of non-random mating by environment type provide strong evidence that ecological speciation has occurred. The processes involved in the origins of RI are more difficult to detect however. One mechanism involves the correlated evolution of mating preferences and sexually selected traits. I developed a conceptual model for detecting RI under various scenarios of mate preference evolution. The model predicts that RI will not evolve

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22

Bundsen, Andreas. "Artificial selection for large and small relative brain size in guppies (Poecilia reticulata) results in differences in cognitive ability." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-192953.

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Vertebrate brain size is remarkably variable at all taxonomic levels. Brains of mammals forexample, range from 0.1 gram in small bats (Chiroptera) to about 8-9 kilos in Sperm whales(Physeter macrocephalus). But what does this variation in size really mean? The link between brainsize and cognition is debated due to, for instance the difficulties of comparing cognitive ability indifferent species. A large number of comparative studies continue to provide information aboutcorrelations found both within and between species. The relative size of the brain is an example of apopular measurement that

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23

Gordon, Swanne P. "Evolution of fitness in the wild." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98712.

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Environments are changing rapidly, which renders many local populations susceptible to extinction unless they can adapt to these changes. Studies of rapid adaptation commonly document the evolution of individual traits. Overall adaptation however, is a function of fitness itself, rather than the individual traits that contribute to fitness. Although numerous studies provide evidence for the evolution of specific traits on contemporary time scales, no published studies of wild animal populations have examined the evolution of a major fitness component following environmental change. My research

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24

Borner, Karoline [Verfasser], Jens [Gutachter] Krause, Thomas [Gutachter] Mehner, and Daniel W. [Gutachter] Franks. "Influence of turbidity on social structure in guppies, Poecilia reticulata / Karoline Borner ; Gutachter: Jens Krause, Thomas Mehner, Daniel W. Franks." Berlin : Lebenswissenschaftliche Fakultät, 2016. http://d-nb.info/111763826X/34.

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25

Rodgers, Brandon. "Poecilia reticulata predation on Aedes aegypti larvae : effects of predator body size and vegetation density." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100206.

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In this study, predation efficiency of three guppy ( Poecilia reticulata) size classes was evaluated at various vegetation densities in a series of circular aquaria containing plastic plants closely resembling Ceratophyllum demersum. The effect of vegetation density was most apparent among large fish where predation efficiency greatly diminished from 12.35 mosquito larvae (Aedes aegypti) to 4.68 as vegetation densities rose from 3 to 19 plants/700 cm2. Over that same range of increasing vegetation densities, predation among small fish remained unchanged, whereas among fish of intermediate size

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26

Banet, Amanda Inez. "Evolutionary diversification of reproductive modes in livebearing fishes." Diss., [Riverside, Calif.] : University of California, Riverside, 2009. http://proquest.umi.com/pqdweb?index=0&did=1957301301&SrchMode=2&sid=4&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1268858219&clientId=48051.

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Thesis (Ph. D.)--University of California, Riverside, 2009.<br>Includes abstract. Available via ProQuest Digital Dissertations. Title from first page of PDF file (viewed March 17, 2010). Includes bibliographical references. Also issued in print.

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27

Sievers, Caya. "Enemy within the gates : reasons for the invasive success of a guppy population (Poecilia reticulata) in Trinidad." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1865.

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The invasion of individuals into new habitats can pose a major threat to native species and to biodiversity itself. However, the consequences of invasions for native populations that are not fully reproductively isolated from their invaders are not yet well explored. Here I chose the Trinidadian guppy, Poecilia reticulata, to investigate how different population traits shaped the outcome of Haskins's introduction, a well-documented invasion of Guanapo river guppies into the Turure river. I especially concentrated on the importance of behaviour for invasive success. I investigated if the spread

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28

Gomide, Jefferson Mendes. "ESTIMATIVA DOS PARÂMETROS GENÉTICOS DE CARACTERES MORFOMÉTRICOS EM GUPPY (Poecilia reticulata)." Pontifícia Universidade Católica de Goiás, 2008. http://localhost:8080/tede/handle/tede/2423.

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Made available in DSpace on 2016-08-10T10:39:23Z (GMT). No. of bitstreams: 1 Jefferson Mendes Gomide.pdf: 1020338 bytes, checksum: 0191262649084f3b90170c5b28b340dd (MD5) Previous issue date: 2008-12-17<br>The invasion of new environments is related to the genetic variability of the species. The guppy (Poecilia reticulata) is a species introduced accidentally or artificially, arisen from different populations of captivity around the world. In some countries, these introductions are made repeatedly, particularly to control the growth of disease-transmitting mosquitoes in small lakes and stream

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29

Miranda, Edmund Richard. "Morphological constraints on life history evolution in Poecilia reticulata (Cyprinodontiformes: poeciliinae)." CSUSB ScholarWorks, 1999. https://scholarworks.lib.csusb.edu/etd-project/1722.

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30

Ziege, Madlen, Kristin Mahlow, Carmen Hennige-Sulz, et al. "Audience effects in the Atlantic molly (Poecilia mexicana) : prudent male mate choice in response to perceived sperm competition risk?" Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4517/.

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Background: Multidirectional interactions in social networks can have a profound effect on mate choice behavior; e.g., Poecilia mexicana males show weaker expression of mating preferences when being observed by a rival. This may be an adaptation to reduce sperm competition risk, which arises because commonly preferred female phenotypes will receive attention also from surrounding males, and/or because other males can copy the focal male's mate choice. Do P. mexicana males indeed respond to perceived sperm competition risk? We gave males a choice between two females and repeated the tests unde

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31

Reeve, Al J. "Phenotypic plasticity in thermal tolerance : life history strategy of an invasive freshwater fish." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/6946.

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Background: Temperature has a fundamental effect on organisms because it alters the speed of biochemical reactions and thus metabolism. This influence scales up to have ecosystem wide effects as the life history strategies of individual species differ in response to temperature. With the prospect of increasing global temperatures ecosystem functions could be interrupted. In order to predict the consequences of changing environmental conditions it is important to first establish how fitness related traits are affected by changing thermal conditions. Aims: The aim of this thesis was to develop a

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32

Cunha, Larissa da. "Produção de guppys (Poecilia reticulata) em sistemas de cultivo com bioflocos." Universidade Federal do Pampa, 2016. http://dspace.unipampa.edu.br:8080/xmlui/handle/riu/495.

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33

Brooks, Robert Clinton. "Sexual selection by female choice in guppies (Poecilia reticulata)." Thesis, 1996. http://hdl.handle.net/10539/21433.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg in fulfillment of the requirement for the degree of Doctor of Philosophy JOHANNESBURG January 1996<br>I investigated some evolutionary implications of female mate choice in a feral population of guppies (Poecllia reticultuai. I performed correlative and manipulative experiments to establish the relationship between female mate choice and other sexually selective forces including iutermale aggression and sneak copulation, and the exaggerated secondary sex characters (ornaments) of male guppies. O

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34

Burns, James G. "Intra-specific variation in temperament, spatial memory, and brain size in guppies (Poecilia reticulata)." 2007. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=742338&T=F.

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35

Rennison, Diana Jessie. "Spatial characterization of visual opsin gene expression in the guppy (Poecilia reticulata)." Thesis, 2010. http://hdl.handle.net/1828/3654.

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Guppies exhibit color based sexual dimorphism and females generally prefer the most colorful males. It has also recently been found that guppies possess a large opsin repertoire. As opsins are the receptors responsible for color vision, this ten gene repertoire might have contributed to the evolution of extravagant male coloration in this species. My study starts by characterizing the opsin repertoire of Jenynsia onca, a noncolorful relative of the guppy belonging to the family Anablepidae (sister group to Poeciliidae, of which the guppy is a member). A PCR based survey indicated that J.

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36

Ward, Matthew Norman. "The molecular basis of colour vision in colourful fish : four long wave-sensitive (LWS) opsins in guppies (Poecilia reticulata) are defined by amino acid substitutions at key functional sites." Thesis, 2008. http://hdl.handle.net/1828/2490.

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Comparisons of functionally important changes at the molecular level in model systems have identified key adaptations driving isolation and speciation. For example, recent studies suggest mutations in opsins, the genes that encode retinal photoreceptors, influence colour-based female mate choice and have, thereby, contributed to the radiation of African cichlids. To test the hypothesis that the evolution of elaborate colouration in guppies (Poecilia reticulata) is also associated with opsin gene diversity, long wavelength-sensitive (LWS) opsin genes were sequenced in six species of the family

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37

Willmann, Matthias [Verfasser]. "Wie viele Guppys leben in Santiago? : zur Ubiquität des numerischen Priming beim Ankereffekt / vorgelegt von Matthias Willmann." 2004. http://d-nb.info/971356963/34.

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