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Dissertations / Theses on the topic 'Polyandry'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Butchart, Stuart Howard Miles. "Sexual conflicts and polyandry in bronze-winged jacanas." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624987.

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2

Ronkainen, K. (Katri). "Polyandry, multiple mating and sexual conflict in a water strider, Aquarius paludum." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212364.

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Abstract Sexual selection results from competition between individuals over access to gametes of the opposite sex. Starting with anisogamy, with females producing larger and fewer gametes than males, females usually invest more in reproduction and thus have lower potential reproductive rates than males. Therefore males are traditionally suggested to compete over females whereas females are choosy. The different evolutionary interests between the sexes result in different selection regimes considering e.g. mating rates. In some species, this conflict is even seen as apparent struggles between m
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3

Nilsson, Tina. "Polyandry and the evolution of reproductive divergence in insects." Doctoral thesis, Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-181.

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4

Firman, Renee C. "The evolutionary implications of polyandry in house mice (Mus domesticus)." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0162.

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[Truncated abstract] Despite the costs associated with mating, females of many taxa solicit multiple mates during a single reproductive event (polyandry). Polyandry is clearly adaptive when females gain direct benefits from males at mating. However, polyandry has also been shown to increase female fitness in the absence of direct benefits. Thus, a number of genetic benefit hypotheses have been developed to account for the origin of this behaviour. Although not mutually exclusive, a distinction lays between genetic benefits that propose defense against reproductive failure (nonadditive genetic
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5

Ivy, Tracie Marie Sakaluk Scott Kitchener. "The evolution of polyandry in the decorated cricket, Gryllodes sigillatus." Normal, Ill. : Illinois State University, 2005. http://proquest.umi.com/pqdweb?index=0&did=1221741601&SrchMode=1&sid=4&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1176386432&clientId=43838.

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Thesis (Ph. D.)--Illinois State University, 2005.<br>Title from title page screen, viewed April 12, 2007. Dissertation Committee: Scott K. Sakaluk (chair), Diane L. Byers, Steven A. Juliano, Sabine S. Loew, William L. Perry. Includes bibliographical references (leaves 96-114) and abstract. Also available in print.
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Herridge, Elizabeth J. "The role of polyandry in sexual selection among dance flies." Thesis, University of Stirling, 2016. http://hdl.handle.net/1893/25013.

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Elaborate sexual ornaments evolve because mate choice exerts strong sexual selection favouring individuals with high levels of ornament expression. Consequently, even at evolutionary equilibrium, life history theory predicts that ornamental traits should be under directional sexual selection that opposes contrasting selection to reduce the costs associated with their maintenance. Otherwise, the resources used to maintain ornaments should be used to improve other life history functions. Elaborate female ornaments have only evolved in a few species, despite females commonly experiencing strong s
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7

Long, Christopher. "Testing for indirect benefits of polyandry in the Florida green turtle." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5982.

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Behavioral studies in the green turtle (Chelonia mydas) have indicated that promiscuous mating is commonplace. Though it has been shown that there is much variation in the rate of polyandry (females mating with multiple males), the drivers behind polyandry in this species are unknown. It has been speculated, but never demonstrated, that indirect benefits (fitness benefits resulting from offspring genetic diversity) play a role. However, previous tests of this hypothesis have limited scope of inference due to lack of environmental control. In this thesis, I attempted to study the indirect benef
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8

Morimoto, Juliano. "Polyandry and nutrition : key modulators of sexual selection in Drosophila melanogaster." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:d0c59fbf-2d31-4959-8001-776a388a5898.

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Sexual selection is responsible for the evolution of formidable adaptations across the tree of life. Traditionally, sexual selection research has focused on male sexual displays and female choice. However, this approach ignores important social and environmental factors that can influence the operation of sexual selection. In this thesis, I aim to contribute to our knowledge of the effects of social and environmental factors, particularly those related to nutrition, on sexual selection. I investigate how the sexual behaviour of females and the nutritional and social environments of both sexes
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9

Worden, Bradley Dean. "Female mating behavior in the Beetle Tenebrio Molitor : polyandry and parasite-mediated sexual selection /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488205318511058.

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10

Katvala, M. (Mari). "Female reproduction and conspecific utilisation in an egg-carrying bug:-Who carries, who cares?" Doctoral thesis, University of Oulu, 2003. http://urn.fi/urn:isbn:9514269691.

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Abstract Female ability to exploit conspecifics in reproduction may have unusual expressions. I studied the reproductive behaviour of the golden egg bug (Phyllomorpha laciniata; Heteroptera, Coreidae) experimentally in the field and in the laboratory. Female golden egg bugs lay their eggs mainly on the backs of conspecific males and other females. Non-parental eggs are often carried. Occasionally, the eggs are laid on the food plant (Paronychia spp; Polycarpea, Caryophyllaceae) of the species but typically, those eggs survive poorly due to egg parasitism and predation. I explored the dependenc
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11

Banger, Nicola A. "Consequences of Multiple Paternity for Female Fitness in an Ontario Population of Northern Map Turtles, 'Graptemys geographica'." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22881.

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Although sexual stereotypes paint males as being promiscuous and females as being choosy in order to increase their reproductive success, multiple mating by females is widespread and females of many taxa often produce progeny sired by multiple males – but why? In species in which there are no direct benefits associated with mating, females may adopt promiscuous mating strategies to increase their fitness through the acquisition of genetic benefits. Here, I examine the genetic mating system of map turtles, Graptemys geographica in Lake Opinicon. Based on the most conservative estimate, at least
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12

Rossmanith, Eva. "Breeding biology, mating system and population dynamics of the Lesser Spotted Woodepcker (Picoides minor) : combining empirical and model investigations." Phd thesis, Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2005/532/.

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The protection of species is one major focus in conservation biology. The basis for any management concept is the knowledge of the species autecology. In my thesis, I studied the life-history traits and population dynamics of the endangered Lesser Spotted Woodpecker (Picoides minor) in Central Europe. Here, I combine a range of approaches, from empirical investigations of a Lesser Spotted Woodpecker population in the Taunus low mountain range in Germany, the analysis of empirical data and the development of an individual-based stochastic model simulating the population dynamics.<br><br> In th
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13

Neumann, Peter. "The impact of polyandry and drifting on the genotypic composition of honeybee (Apis mellifera L.) colonies." [S.l. : s.n.], 1998. http://deposit.ddb.de/cgi-bin/dokserv?idn=960878742.

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14

Välimäki, P. (Panu). "Reproductive tactics in butterflies – the adaptive significance of monandry versus polyandry in Pieris napi." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514284847.

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Abstract Females may either mate with one (monandry) or several (polyandry) males during a single breeding season. The polyandrous mating system has prompted numerous studies since the recognition of a widespread occurrence of mixed paternity among animals. Consequently, the benefits of polyandry have become well-established, and the female role in sexual selection upgraded. Females may gain both material and genetic benefits from multiple mating. Hence, the occurrence of polyandry is understandable, whereas monandry remains an evolutionary puzzle especially among species with male nutrient pr
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15

Вашека, Тетяна Володимирівна, and Валерія Ярославівна Юдіна. "Postmodern moral world: the changes of attitude towards sex and its connections between polyandry, and polygyny." Thesis, Національний авіаційний університет, 2020. https://er.nau.edu.ua/handle/NAU/49577.

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Postmodern worldview requires a change of focus on the place and role of the traditional social institutions and habitual behaviors within them. The latest researches state that significant differences in attitudes towards sex were found among different generations. B. Christlieb explored sexual attitudes through the lens of family sexual communication and demographic factors
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Вашека, Тетяна Володимирівна, and Валерія Ярославівна Юдіна. "Postmodern moral world: the changes of attitude towards sex and its connections between polyandry, and polygyny." Thesis, Національний авіаційний університет, 2020. http://er.nau.edu.ua/handle/NAU/42309.

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Postmodern worldview requires a change of focus on the place and role of the traditional social institutions and habitual behaviors within them. The latest researches state that significant differences in attitudes towards sex were found among different generations. B. Christlieb explored sexual attitudes through the lens of family sexual communication and demographic factors
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Вашека, Тетяна Володимирівна, and Валерія Ярославівна Юдіна. "Postmodern moral world: the changes of attitude towards sex and its connections between polyandry, and polygyny." Thesis, Національний авіаційний університет, 2020. https://er.nau.edu.ua/handle/NAU/54043.

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Postmodern worldview requires a change of focus on the place and role of the traditional social institutions and habitual behaviors within them. The latest researches state that significant differences in attitudes towards sex were found among different generations. B. Christlieb explored sexual attitudes through the lens of family sexual communication and demographic factors
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18

Eckholm, Bruce James. "Effects of Honey Bee (Apis mellifera) Intracolonial Genetic Diversity on the Acquisition and Allocation of Protein." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/293412.

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Honey bees (Apis mellifera) are the most economically important insect pollinator of agricultural crops in the United States. Honey bee colonies are required for pollination of approximately one-third of the nation’s fruit, vegetable, nut, and forage crops, with an estimated annual value in the billions of dollars. The economic value of a honey bee colony comes from its population size, as large colonies provide the necessary foraging force required for large-scale crop pollination services. A major component of colony strength is its genetic diversity, a consequence of the reproductive mating
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19

Barth, Benjamin [Verfasser], Robin F. A. [Akademischer Betreuer] Moritz, Robert J. [Akademischer Betreuer] Paxton, and Susanne [Akademischer Betreuer] Foitzik. "Causes and consequences of extreme polyandry in army ants : [kumulative Dissertation] / Benjamin Barth ; Robin F. A. Moritz, Robert J. Paxton, Susanne Foitzik." Halle, 2016. http://d-nb.info/1116952521/34.

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Barth, Benjamin Verfasser], Robin F. A. [Akademischer Betreuer] Moritz, Robert J. [Akademischer Betreuer] Paxton, and Susanne [Akademischer Betreuer] [Foitzik. "Causes and consequences of extreme polyandry in army ants : [kumulative Dissertation] / Benjamin Barth ; Robin F. A. Moritz, Robert J. Paxton, Susanne Foitzik." Halle, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:3:4-17882.

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21

Kivelä, S. M. (Sami Mikael). "Evolution of insect life histories in relation to time constraints in seasonal environments:polymorphism and clinal variation." Doctoral thesis, Oulun yliopisto, 2011. http://urn.fi/urn:isbn:9789514293788.

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Abstract Both the length of the season that is favourable for insect growth and reproduction and the number of generations emerging per season (voltinism) increase with decreasing latitude. Thus, time constraints on reproduction and juvenile development decrease with decreasing latitude, except where voltinism changes and time constraints suddenly increase as the season must be shared with one more generation. I studied the evolution of insect life histories in relation to time constraints from two perspectives: polymorphism and clinal variation. Life history polymorphism in seasonal environme
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22

Pearcy, Morgan. "Stratégies reproductrices chez la fourmi Cataglyphis cursor." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210909.

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La sélection de la parentèle est le concept actuellement le plus fréquemment avancé pour justifier l’évolution et le maintien d'une caste ouvrière stérile chez les Hyménoptères sociaux. La fourmi méditerranéenne Cataglyphis cursor possède plusieurs traits biologiques qui font de cette espèce un modèle particulièrement intéressant pour tester les prédictions de la théorie de la sélection de la parentèle, le plus important d'entre eux étant la capacité des ouvrières, qui ne s'accouplent jamais, à produire une descendance mâle (haploïde) par parthénogenèse arrhénotoque, ou femelle (diploïde) par
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23

McKeown, Jennifer J. "Modelling the evolution of sexual behaviour." Thesis, University of Stirling, 2014. http://hdl.handle.net/1893/21823.

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This thesis presents two studies where natural and sexual selection have interacted to evolve sexual behaviours. The thesis uses mathematical modelling to understand how these forces have caused each behaviour to evolve. This is useful because the results allow for reflection on the potential role of sexual selection in adaptation of these species to a changing environment. The first study is of early male arrival to spring breeding grounds in migratory avian species, this is termed protandry. The study explores the main hypotheses for avian protandry and then tests the susceptibility of each
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Costa, Camila Moreira. "Ocorrência de poliandria na broca-do-café, Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae)." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-25022014-153249/.

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Estudos relacionados ao sistema de acasalamento nos insetos permite a compreensão dos aspectos evolutivos do comportamento reprodutivo de uma espécie. Esses sistemas são classificados, geralmente, pelo número de parceiros sexuais de um indivíduo durante um período de acasalamento. Em fêmeas, pode ocorrer monogamia, quando a cópula for realizada com somente um macho e, poliandria, quando há ocorrência de múltiplas cópulas com machos diferentes ou com o mesmo macho (cópulas repetidas). Em espécies como a broca-do-café, Hypothenemus hampei, que passam a maior parte de sua vida (ovo a adulto) no i
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25

Pirog, Agathe. "Structure génétique des populations et biologie de la reproduction chez le requin bouledogue Carcharhinus leucas et le requin tigre Galeocerdo cuvier." Thesis, La Réunion, 2018. http://www.theses.fr/2018LARE0008/document.

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Cette thèse porte sur deux espèces de grands requins, le requin bouledogue Carcharhinus leucas et le requin tigre Galeocerdo cuvier. Les objectifs sont d'étudier la structure génétique de leurs populations, la taille efficace des populations identifiées et les modes de reproduction de ces deux espèces. Une différenciation génétique importante a été identifiée entre les populations de requin bouledogue de l'Ouest de l'océan Indien et de l'Ouest du Pacifique, reflétant soit une absence de flux de gènes contemporains, soit des flux de gènes uniquement assurés par les mâles. À l'inverse, les popul
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Eyer, Pierre-André. "Modes de reproduction et diversité génétique chez les fourmis du genre Cataglyphis." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209190.

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Les insectes sociaux représentent le paradigme de la vie coopérative dans le règne animal. Ceci repose sur l’existence d’une division des activités reproductrices entre des individus reproducteurs (les reines et les mâles) et une majorité d’ouvrières sacrifiant leurs propres potentialités reproductives pour assurer l’essentiel des tâches logistiques nécessaires à l’essor des sociétés. Chez les Hyménoptères sociaux, l’analyse comparative des stratégies de reproduction révèle que la structure monogyne (une reine par société) et monandre (un seul accouplement par reine) est l’état ancestral des s
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27

Wright, Lucy Isabel. "Insights into the mating systems of green turtle populations from molecular parentage analyses." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3695.

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Gaining a good understanding of marine turtle mating systems is fundamental for their effective conservation, yet there are distinct gaps in our knowledge of their breeding ecology and life history, owing largely to the difficulty in observing these highly mobile animals at sea. Whilst multiple mating by females, or polyandry, has been documented in all marine turtle species, the fitness consequences of this behaviour have not been fully investigated. Furthermore, male mating patterns, operational sex ratios and the number of males contributing to breeding populations are poorly understood, im
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Croshaw, Dean. "Salamander Mating Behaviors and Their Consequences for Individuals and Populations." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/436.

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In this dissertation, I report new information that is necessary for future mating system studies in a little studied species, the marbled salamander (Ambystoma opacum). I studied female mating behavior, sexual selection, and the consequences of polyandry for individual females and salamander populations. I also compared the performance of several statistical approaches for analyzing genetic mating system data. The first chapter summarizes the characteristics of several novel microsatellite DNA loci as well as cross-amplified loci for marbled salamanders and mole salamanders that may be used f
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Fournier, Denis. "Population genetic structure, mating system and conflicts in Pheidole ants." Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211174.

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A key feature of social Hymenoptera is the division of labor in reproduction between one or a few fertile individuals – the queen(s) – and many sterile nestmates that function as helpers – the workers. The reproductive altruism of workers has long been considered as one of the most important paradox of Evolution. Today, kin selection (Hamilton 1964a,b) is recognized as a prime selective force for the evolution reproductive altruism in Hymenoptera. Hamilton’s kin selection theory states that workers may benefit helping relatives reproduce as long as the relatives they aid share a higher than av
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Boschetto, Chiara. "Meccanismi della selezione sessuale postcopulatoria in un guppy (Poecilia reticulata), un pesce teleosteo a fecondazione interna." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425476.

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Given multiple matings from females, sexual selection continues after insemination in the form of postcopulatory sexual selection. This process is formed by two main mechanisms: sperm competition (competition of sperm of two or more males for the fertilization of the eggs of the same female) and cryptic female choice. These act as powerful selective pressures for the evolution of reproductive biology of both males and females. The aim of this thesis is to analyze the relative importance of sperm competition and cryptic female choice in determining a male reproductive success. The study species
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31

Thurin, Nicolas. "Evolutions des stratégies reproductrices au sein du genre Plagiolepis (Hymenoptera: Formicidae)." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210108.

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Selon la théorie de la sélection de la parentèle, les individus peuvent transmettre des copies de leurs gènes à la génération suivante sans accéder eux-mêmes à la reproduction, mais en aidant des apparentés à augmenter leur propre succès reproductif. Ce concept reste aujourd'hui l'explication la plus probable pour justifier l'évolution de l’altruisme de reproduction dans le règne animal. Les coefficients de corrélations génétiques entre les membres d’un groupe ont une importance capitale, puisqu'ils influencent directement les bénéfices génétiques indirects associés au comportement altruiste.
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32

Nir, Edward Ess. "The monodominant stands of anisoptera thurifera ssp polyandra and their management in Papua New Guinea /." [St. Lucia, Qld], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18255.pdf.

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Fernandes, Heloísa Mara Batista. "Constituintes químicos e avaliação de atividades biológicas de Croton polyandrus Spreng. (Euphorbiaceae)." Universidade Federal da Paraí­ba, 2012. http://tede.biblioteca.ufpb.br:8080/handle/tede/6773.

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Made available in DSpace on 2015-05-14T12:59:48Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 5951876 bytes, checksum: 7dd555c26dc7254b2e08815bdfe2bd1e (MD5) Previous issue date: 2012-11-19<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The family Euphorbiaceae is the sixth largest family of plants in the world represented by 300 genera and 8000 species. Among the many genres that make up this family, the genus Croton stands as the second largest, with about 1300 species, having a neotropical distribution. This genus has been the most studied, due in large part
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Le, Cam Sabrina. "Grégarité, changement de sexe et polyandrie : modalité de la reproduction chez une espèce invasive Crepidula fornicata." Paris 6, 2009. http://hal.upmc.fr/tel-01110473.

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Cette thèse a eu pour objectif d’étudier les liens entre les patrons de changement de sexe et d’autres traits de vie tels que la polyandrie et la grégarité au sein de deux espèces de gastéropodes protandres (i. E. Réversion sexuelle de mâle vers femelle) du genre Crepidula Chez C. Fornicata, une relation entre la diversité des contributions paternelles et la variabilité d’un trait larvaire a été montré, conférant un potentiel avantage reproductif aux femelles. L’analyse d’une seconde espèce, C. Convexa, combinés à des données de la littérature suggèrent, au sein du genre Crepidula, un lien ent
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Pessoa, Déborah Ribeiro. "Estudo da toxidade e atividade antitumoral do óleo essencial de Croton Polyandrus Spreng. (Euphorbiaceae) em Modelo Experimental de Tumor Ascítico de Ehrlich." Universidade Federal da Paraí­ba, 2013. http://tede.biblioteca.ufpb.br:8080/handle/tede/6760.

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Made available in DSpace on 2015-05-14T12:59:44Z (GMT). No. of bitstreams: 1 ArquivoTotalDeborah.pdf: 2268171 bytes, checksum: 77a443346e386730d186259d1b23aa35 (MD5) Previous issue date: 2013-02-28<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Cancer, a complex genetic disease is usually the result of a multifactor process which leads to successive gene changes affecting proliferation, differentiation, and cell death. Natural products are widely used in cancer therapy, and they continue to be a promising source for new anticancer agents. Croton polyandrus Spreng
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Devost, Éric. "Conflit sexuel et polyandrie de la commodité chez une espèce polygynandre : les effets combinés des processus pré- et post- copulatoires sur le succès reproducteur de "Gerris buenoi"." Master's thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/26725.

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Chez les patineurs, des processus postcopulatoires sont documentés et un conflit sexuel sur le taux d'accouplement est démontré. Cependant, leurs effets combinés sur le succès reproducteur ont rarement été investigués. Cette étude joint une analyse de filiation génétique à des observations comportementales pour évaluer l'effet des processus pré- et post- copulatoires sur le succès reproducteur de Gerris buenoi. Nos résultats montrent la nature antagoniste des combats précopulatoires et un niveau de résistance optimal intermédiaire pour les femelles. Cependant, le taux d'accouplement n'a eu auc
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Clemencet, Johanna. "Evolution des stratégies de dispersion et de reproduction chez la fourmi Cataglyphis cursor." Paris 6, 2006. http://www.theses.fr/2006PA066106.

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38

Cliche, Marie-Ève. "Illusion et rhétorique de la folie comique entre 1630 et 1650 : le discours des mythomanes et des monomaniaques dans Le Menteur de Pierre Corneille, Les Visionnaires de Jean Desmarets de Saint-Sorlin et Polyandre de Charles Sorel." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/28422/28422.pdf.

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Par le biais d’une analyse du discours des personnages excentriques que nous retrouvons dans deux comédies et dans un roman comique français des décennies 1630-1640, Les Visionnaires (1637) de Jean Desmarets de Saint-Sorlin, Le Menteur (1643) de Pierre Corneille et Polyandre (1648) de Charles Sorel, nous nous intéressons aux liens qu’entretiennent illusion et folie au milieu du XVIIe siècle. Nous examinons plus précisément les procédés discursifs et rhétoriques caractéristiques du discours des personnages de fous comiques de cette période, afin de dégager des tendances révélatrices de la pensé
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Timmermans, Iris. "Stratégies de reproduction au sein du genre Cataglyphis (Hymenoptera :Formicidae): analyse comparative." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210238.

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Les fourmis, comme tous les Hyménoptères, sont caractérisées par un mode de détermination du sexe de type haplodiploïde. Les femelles sont issues d’œufs fertilisés et sont diploïdes alors que les mâles se développent à partir d’œufs non fertilisés par parthénogenèse arrhénotoque, et sont haploïdes. A quelques rares exceptions près, le déterminisme de la caste au sein du sexe femelle est réalisé de manière épigénétique :seules les larves diploïdes les mieux nourries et/ou celles produites après le repos hivernal se développent en femelles sexuées (reines), les autres en femelles non reproductri
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Beltran, S. "Monogamie et changements de partenaires chez un parasite monogame, Schistosoma mansoni." Phd thesis, Université de Perpignan, 2009. http://tel.archives-ouvertes.fr/tel-00939328.

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La monogamie est un système d'appariement qui lie une seule femelle à un seul mâle. Cette monogamie peut être définie comme sociale et génétique (au-delà de l'observation du couple, la descendance est seulement issue de ce couple, aucun changement de partenaire n'apparaît), ou comme sociale et non génétique (dans ce cas, des infidélités ou des divorces peuvent être observés). Ce système d'appariement est très rare dans le monde animal. Il concerne moins de 1% des animaux et la majeure partie des études sur le monogamie a été réalisée sur des vertébrés (notamment sur les oiseaux dont 90% des es
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Meunier, Léna. "Reproductive biology and senescence impact on postcopulatory sexual selection in a wild polyandrous bird, the North African Houbara Bustard (Chlamydotis undulata undulata)." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK028.

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Résumé La polyandrie, lorsque les femelles s'accouplent avec plusieurs mâles, augmente les possibilités de sélection sexuelle, car outre la compétition entre les mâles pour l'accès à la femelle (sélection sexuelle pré-copulatoire), les spermatozoïdes des différents mâles sont également en compétition pour la fécondation (sélection sexuelle post-copulatoire). En conséquence, la plupart des descendants sont engendrés par le dernier mâle qui s’est accouplé avec la femelle, un phénomène appelé "last male precedence" (LMP). En plus de l'ordre d'accouplement, la quantité et la qualité des spermatozo
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Zeh, Jeanne Anne. "Polyandry as a hedge against genetic incompatibility." Thesis, 1996. http://hdl.handle.net/1911/16945.

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Why do females across a wide range of taxa mate with more than one male? Here, I present the hypothesis that females engage in polyandry as a hedge against genetic incompatibility. I review evidence from the literature showing that the genomes of species are dynamic entities, constantly evolving as a consequence of genetic conflicts within and between the nucleus and the cytoplasm. Cellular endosymbionts, segregation distorter alleles, transposable elements and genomically-imprinted genes can all threaten female fitness by modifying maternal and paternal haplotypes in ways that render them inc
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Foster, Wendy. "Reproductive strategies of the red-tailed phascogale (Phascogale calura)." 2008. http://digital.library.adelaide.edu.au/dspace/handle/2440/49885.

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Thesis (Ph.D.) - University of Adelaide, School of Earth and Environmental Sciences, Discipline of Ecology and Evolutionary Biology, 2008.<br>"March 2008" -- T.P. Includes author's previously published papers. Bibliography: pages 104-118. Also available in print form.
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Rodrigues, Ana Leonor Rapoula. "Polyandry and host-endosymbiont conflicts in the spider mite tetranychus urticae." Doctoral thesis, 2017. http://hdl.handle.net/10451/30396.

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Tese de doutoramento, Biodiversidade, Genética e Evolução, Universidade de Lisboa, Faculdade de Ciências, 2017<br>Organisms compete for several resource types, the most studied being food, hosts and mates. Regrettably, the study of competition for each of these resource types belongs to different research fields that rarely overlaps, which might hamper a comprehensive understanding of competition as pervasive selective force. In this work, we begin by showing how experimental evolution can be transversally applied to the study of competition across research fields and attempt to extract genera
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Foster, Wendy Kay. "Reproductive strategies of the red-tailed phascogale (Phascogale calura)." Thesis, 2008. http://hdl.handle.net/2440/49885.

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This thesis examines the reproductive biology of red-tailed phascogales, an obligate male semelparous dasyurid species, which is part of a captive breeding colony at Alice Springs Desert Park. The red-tailed phascogale belongs to a group of dasyurids that shows an unusual reproductive strategy amongst mammals, one which provides opportunity for understanding means by which individuals maximise their reproductive success and the role of sperm competition. The broad aim was to gain an understanding of the reproductive biology of red-tailed phascogales and explore means by which individuals
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Foster, Wendy Kay. "Reproductive strategies of the red-tailed phascogale (Phascogale calura)." 2008. http://hdl.handle.net/2440/49885.

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This thesis examines the reproductive biology of red-tailed phascogales, an obligate male semelparous dasyurid species, which is part of a captive breeding colony at Alice Springs Desert Park. The red-tailed phascogale belongs to a group of dasyurids that shows an unusual reproductive strategy amongst mammals, one which provides opportunity for understanding means by which individuals maximise their reproductive success and the role of sperm competition. The broad aim was to gain an understanding of the reproductive biology of red-tailed phascogales and explore means by which individuals can a
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Jennions, Michael Dawson. "Breeding behaviour of the foam nest frog, chiromantis xerampelina: sperm competition and polyandry." Thesis, 1992. https://hdl.handle.net/10539/25661.

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Thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg in fulfilment of the requirements for the degree of Master of Science.<br>Breeding was observed in the foam nest frog, Chiromantis xerampelina, over three breeding seasons The mating pattern was characterized by an extended breeding season with a male-biased operational sex ratio and asynchronous and unpredictable female arrival. At more than 90% of nests, from one to seven unpaired males ('peripheral males') gathered around the amplexing pair during nest construction. Those peripheral males close
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Sládeček, Martin. "Vliv individuálních vlastností samic čejky chocholaté (Vanellus vanellus) na kvalitu snůšky, párovací status a inkubační úsilí samce." Master's thesis, 2015. http://www.nusl.cz/ntk/nusl-344389.

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Feather ornaments and its role as a signals in sexual selection has been broadly studied topic in avian biology. However, vast majority of studies focus especially on role of male ornamentation and female preferences in sexual selection. Despite this fact, recent work shows, that similar palette of adaptive functions can be found for female feather ornaments, and male preferences for them, respectively. This study focuses on possible importance of female melanin-based ornaments and other individual on breeding performance in the Northern Lapwing (Vanellus vanellus), common polygynous wader bre
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Neumann, Peter [Verfasser]. "The impact of polyandry and drifting on the genotypic composition of honeybee (Apis mellifera L.) colonies / von Peter Neumann." 1998. http://d-nb.info/960878742/34.

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Ševčíková, Pavlína. "Experimentální studie vlivu páření s více samci na reprodukční úspěch samice u gekončíků Eublepharis macularius." Master's thesis, 2010. http://www.nusl.cz/ntk/nusl-296530.

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The aim of the project was to test female advantages of promiscuous and/or polyandrous mating. Although, previous studies reported improved reproductive success of females copulating with multiple males in many model species, including Eublepharis macularius, this study failed to demonstrate such a benefit of polyandry. Traits reflecting female reproductive success, i.e. the number of produced eggs, egg mass, hatchability, hatchling mass, growth and survival were not influenced by copulation with multiple partners, but some of them were dependent on female condition. Only initial stages of juv
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