Log in

Relevant bibliographies by topics / Evolution of traits / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Evolution of traits.

Dissertations / Theses on the topic 'Evolution of traits'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Evolution of traits.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Thompson, Julie Tolman. "Complex traits : multimodal behavior and convergent evolution /." view abstract or download file of text, 2002. http://wwwlib.umi.com/cr/uoregon/fullcit?p3072607.

Full text

Abstract:

Thesis (Ph. D.)--University of Oregon, 2002.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 87-99). Also available for download via the World Wide Web; free to University of Oregon users.

APA, Harvard, Vancouver, ISO, and other styles

2

Jackson, Adam. "Metagames : the evolution of game-changing traits." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/405217/.

Full text

Abstract:

Cooperative social behaviours are ubiquitous in nature and essential to biological theory, yet they present an apparent paradox since cooperators benefit others while potentially incurring a fitness cost. The standard resolution is that cooperation is evolutionarily stable if cooperative behaviours are positively assorted, so their benefits are directed at other cooperators, shifting the problem to explaining the presence of positive assortment. If we view individuals as playing an evolutionary game, then the evolution of assorting traits changes the rules of the game to allow for greater coop

APA, Harvard, Vancouver, ISO, and other styles

3

Innocent, Tabitha M. "Social evolution in Melittobia." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3874.

Full text

Abstract:

Interactions between individuals can range from peaceful cooperation, through mediated contest, to escalated conflict. Understanding such diversity of interactions between individuals requires an understanding of the costs and benefits involved with these behaviours, and the influence of relatedness between interacting individuals. Species in the parasitoid wasp genus Melittobia display social behaviours at both extremes of this spectrum, from the potentially cooperative traits of the ratio of male to female offspring that they produce, and the dispersal of females to new habitats, to the extr

APA, Harvard, Vancouver, ISO, and other styles

4

Calcraft, Paul Richard Thomas. "The evolution of group traits : modelling natural selection on trait prevalence within and between groups." Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/67214/.

Full text

Abstract:

One of evolution's greatest innovations was group living; indeed, it is fundamental to our daily lives as humans. Yet despite intense theoretical and empirical work, the details of how group living arose and is maintained are poorly understood. A central question in this area concerns the strength of natural selection operating between groups of organisms (group selection) because some think this is key to the evolution of group behaviour. It is, however, challenging to measure natural selection occurring between groups and between the individuals within those groups simultaneously. Consequent

APA, Harvard, Vancouver, ISO, and other styles

5

Alonso-Pimentel, Henar. "Diversity and evolution of reproductive traits among cactophilic Drosophila." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186383.

Full text

Abstract:

Interspecific diversity of reproductive traits among cactophilic Drosophila is described at different levels. The insemination reaction concept is reexamined using ultrastructural techniques. Examination of the vaginal contents of five Drosophila species suggested three distinct, more precise terms: the sperm sac, the mating plug and the true insemination reaction. Behavioral and physiological factors associated with the expulsion of the sperm sac in D. mettleri are explored in detail. Timing of the expulsion of the sperm sac appears to be correlated with the nutritional state of the female; t

APA, Harvard, Vancouver, ISO, and other styles

6

Nielsen, Matthew Erik. "Interactions among multiple plastic traits in caterpillar thermoregulation." Thesis, The University of Arizona, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10196461.

Full text

Abstract:

<p> Adaptive phenotypic plasticity is a key mechanism by which organisms deal with variation in many different aspects of their environment. Adaptive plasticity can occur in any trait, from aspects of biochemistry and morphology to behaviors. Because so many different traits can be plastic, organisms often respond plastically to a given change in their environment, such as an increase in temperature, with adaptive changes in multiple traits. Nevertheless, how these different plastic responses interact with each other and evolve together has received little attention. My research addresses thes

APA, Harvard, Vancouver, ISO, and other styles

7

Civetta, Alberto. "The evolution of sex-related traits and speciation in Drosophila." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0006/NQ42733.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Tamarit, Daniel. "Evolution of symbiotic lineages and the origin of new traits." Doctoral thesis, Uppsala universitet, Molekylär evolution, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301939.

Full text

Abstract:

This thesis focuses on the genomic study of symbionts of two different groups of hymenopterans: bees and ants. Both groups of insects have major ecological impact, and investigating their microbiomes increases our understanding of their health, diversity and evolution. The study of the bee gut microbiome, including members of Lactobacillus and Bifidobacterium, revealed genomic processes related to the adaptation to the gut environment, such as the expansion of genes for carbohydrate metabolism and the acquisition of genes for interaction with the host. A broader genomic study of these genera d

APA, Harvard, Vancouver, ISO, and other styles

9

Fallis, Lindsey Caroline. "The evolution and genetics of thermal traits in Drosophila melanogaster." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13662.

Full text

Abstract:

Doctor of Philosophy<br>Division of Biology<br>Theodore Morgan<br>Temperature is a critical environmental parameter and thermal variation has significant effects on local adaptation and species distributions in nature. This is especially true for organisms that are isothermal with their environment. Variation in temperature imposes stress and directly influences physiology, behavior, and fitness. Thus, to thrive across a range of thermal environments populations must contain sufficient genetic variation, the capacity to respond plastically, or some combination of both genetic and plastic res

APA, Harvard, Vancouver, ISO, and other styles

10

Ferguson-Gow, Henry. "The evolution of social traits and biodiversity in the ants." Thesis, University of East Anglia, 2014. https://ueaeprints.uea.ac.uk/53449/.

Full text

Abstract:

Cooperation has shaped the evolution of life on Earth. The ants are the most numerically diverse of the eusocial Hymenoptera, and display wide variation in social complexity. This positions the ants as an ideal taxon in which to study social evolution in a comparative framework. Social evolution theory has generated many hypotheses that are testable in ants, however the lack of comprehensive or complete phylogenies, and the decentralised and scattered nature of trait data, has been an obstacle to these types of study. In this thesis I construct a large species-level, and a complete genus-level

APA, Harvard, Vancouver, ISO, and other styles

11

Hanschen, Erik Richard, and Erik Richard Hanschen. "The Evolution of Cell Cycle Regulation, Cellular Differentiation, and Sexual Traits during the Evolution of Multicellularity." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/626165.

Full text

Abstract:

During the evolution of multicellularity from unicellular ancestors, cells transition from being evolutionary individuals to components of more complex, multicellular evolutionary individuals. The volvocine green algae provide a powerful model system for understanding the genetic and morphological changes that underlie and are caused by the evolution of multicellularity. This dissertation concerns the role of cell cycle regulation, cellular differentiation, and sexual traits during the evolution of multicellularity. While some of these are shown to be causally important in the origins of multi

APA, Harvard, Vancouver, ISO, and other styles

12

de, Castro Francisco, Ursula Gaedke, and Jens Boenigk. "Reverse evolution : driving forces behind the loss of acquired photosynthetic traits." Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4496/.

Full text

Abstract:

Background: The loss of photosynthesis has occurred often in eukaryotic evolution, even more than its acquisition, which occurred at least nine times independently and which generated the evolution of the supergroups Archaeplastida, Rhizaria, Chromalveolata and Excavata. This secondary loss of autotrophic capability is essential to explain the evolution of eukaryotes and the high diversity of protists, which has been severely underestimated until recently. However, the ecological and evolutionary scenarios behind this evolutionary ‘‘step back’’ are still largely unknown. Methodology/Principa

APA, Harvard, Vancouver, ISO, and other styles

13

Markey, Adrienne Selina, and n/a. "The evolution of fruit traits in Coprosma and the subtribe Coprosminae." University of Otago. Department of Botany, 2006. http://adt.otago.ac.nz./public/adt-NZDU20061206.160155.

Full text

Abstract:

The flora of New Zealand has evolved largely in the absence of terrestrial mammals, the predominant frugivore guilds being birds and reptiles. The evolution of divergent fruit traits in New Zealand may be a consequence of different selection pressure by these two guilds, and two contrasting putative dispersal syndromes have been proposed for New Zealand fleshy fruited plants. Coprosma (Rubiaceae: subtribe Coprosminae) is a speciose and morphologically diverse genus, which is distributed throughout the South Pacific and which also produces variably coloured drupes. It was selected as a model ge

APA, Harvard, Vancouver, ISO, and other styles

14

Bédhomme, Stéphanie. "Evolution des traits d'histoire de vie dans un système hôte-parasite." Montpellier 2, 2004. http://www.theses.fr/2004MON20099.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Kazemi, Baharan. "Evolution of Mimicry and Aposematism Explained: Salient Traits and Predator Psychology." Doctoral thesis, Stockholms universitet, Zoologiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-148488.

Full text

Abstract:

Aposematic species have evolved conspicuous warning signals, such as bright colors and striking patterns, to deter predators. Some edible and harmless species take advantage of this deterrent effect by mimicking their appearance. Mimicry is a great example of how natural selection produces remarkable adaptations. However, while some species evolve a very close similarity to their models to effectively avoid attacks, others are successful in doing so despite an incomplete similarity, i.e. imperfect mimicry. In some cases, it is surprising how such a crude disguise can fool predators. Why and ho

APA, Harvard, Vancouver, ISO, and other styles

16

Bruy, David. "Diversity, ecology and evolution of monocaulous plants in New Caledonia." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG087/document.

Full text

Abstract:

L’évolution convergente des formes de croissance est un phénomène fondamental reliant l’écologie et l’évolution des plantes. Remarquablement illustré dans plusieurs systèmes insulaires, ce phénomène n’a jamais été identifié en Nouvelle-Calédonie, pourtant connue pour la richesse et l’originalité de sa flore. Par une approche combinant architecture des plantes, traits fonctionnels, taxonomie, phylogénie et données environnementales, cette thèse analyse l’histoire évolutive de la monocaulie, une forme de croissance mal connue, en Nouvelle-Calédonie. Les monocaules sont des plantes autoportantes

APA, Harvard, Vancouver, ISO, and other styles

17

Boyd, Amy Elizabeth. "Evolution of floral traits: Biogeography, pollination biology and phylogenetics in Macromeria viridiflora." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279781.

Full text

Abstract:

Macromeria viridiflora is an herbaceous perennial in which floral traits vary geographically. In my dissertation research, I analyzed geographic variation in plant morphology and pollinator assemblages. I conducted experiments to determine the breeding system of the plants, and used visitation rate and pollen deposition to compare effectiveness of floral visitors as pollinators. I analyzed aspects of pollinator attractants and rewards in the flowers and placed this into the context of pollinator syndromes. In addition, I used phylogenetic analysis of the genus to determine polarity of change i

APA, Harvard, Vancouver, ISO, and other styles

18

Jorgensen, Michael E. "Evolution of Anuran Axial and Pelvic Musculoskeletal Traits Associated with Locomotor Modes." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1385376238.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Hemani, Gibran. "Dissecting genetic interactions in complex traits." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/6472.

Full text

Abstract:

Of central importance in the dissection of the components that govern complex traits is understanding the architecture of natural genetic variation. Genetic interaction, or epistasis, constitutes one aspect of this, but epistatic analysis has been largely avoided in genome wide association studies because of statistical and computational difficulties. This thesis explores both issues in the context of two-locus interactions. Initially, through simulation and deterministic calculations it was demonstrated that not only can epistasis maintain deleterious mutations at intermediate frequencies whe

APA, Harvard, Vancouver, ISO, and other styles

20

Han, Sojung. "Bonobo evolution : from the perspective of genomes." Doctoral thesis, Universitat Pompeu Fabra, 2019. http://hdl.handle.net/10803/667773.

Full text

Abstract:

Bonobos are an interesting species to study due to their unique evolutionary features such as a peaceful social nature and hypersexual behavior. The prolonged exaggerated sexual swelling in females is a notable difference to chimpanzees, from which they diverged < 2 Million years ago. In my studies, I first show using whole-exomes, that there is genetic population substructure in bonobos. I estimate that the split between the western and the central bonobo population might be >100,000 years ago, comparable to modern human population split times. Second, I show that lineage-specific non-s

APA, Harvard, Vancouver, ISO, and other styles

21

Stahl, Bethany A. "Regressive Evolution of Pigmentation in the Blind Mexican Cavefish Astyanax mexicanus." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439281730.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Niemi, A. K. (Anna-Kaisa). "Mitochondrial DNA variation in extremely selected traits: longevity and elite athletic performance." Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:951427699X.

Full text

Abstract:

Abstract Mitochondria contain a maternally inherited 16,568bp genome (mtDNA) that encodes for 13 out of more than 70 subunits of complexes of the respiratory chain that produce ATP by oxidative phosphorylation (OXPHOS). As a byproduct of OXPHOS, reactive oxygen species (ROS) are formed, which may play a role in ageing. MtDNA has accumulated numerous polymorphisms during evolution, leading to haplogroups characterized by ancient polymorphisms and defined by letters. MtDNA polymorphisms are thought to be neutral, but some may be slightly deleterious or even advantageous and may influence phenoty

APA, Harvard, Vancouver, ISO, and other styles

23

Chaney, Lindsay. "Understanding the evolutionary potential of weeds: Baker’s weediness traits, tolerance to competition, and the general purpose genotype." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1396524273.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Oh, Kevin. "EVOLUTIONARY DYNAMICS OF SEXUAL TRAITS: DEMOGRAPHIC, GENETIC, AND BEHAVIORAL CONTINGENCIES." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194221.

Full text

Abstract:

The evolution of adaptation depends on genetic and phenotypic variation, both of which are expected to be depleted in populations as a result of selection. Thus, understanding the maintenance of variation in fitness-related traits is of central importance in evolutionary biology as such processes can mitigate the constraining effects of adaptation on evolutionary change. Secondary sexual traits involved in attracting mates offer conspicuous examples of adaptation and are suggestive of strong directional selection, yet abundant variation is commonly observed both within and among populations. O

APA, Harvard, Vancouver, ISO, and other styles

25

Johnson, Steven D. "Pollination and the evolution of floral traits : selected studies in the Cape flora." Doctoral thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/21711.

Full text

Abstract:

Bibliography: pages 132-149.<br>The study of plant pollination mechanisms has produced some of the most convincing examples of natural selection and adaptation. The aims of this thesis were to determine the role of pollinators in the evolution of floral traits in selected Cape plants, and to reach a better understanding of the relationship between floral adaptation and speciation. To establish a set of testable hypotheses, I asked specifically how adaptation to pollinators can explain three striking patterns in the Cape flora, namely (1) convergence in floral form between unrelated lineages (2

APA, Harvard, Vancouver, ISO, and other styles

26

Jordan, Felix [Verfasser], and Dirk [Akademischer Betreuer] Metzler. "The evolution of altruistic defense traits in structured populations / Felix Jordan. Betreuer: Dirk Metzler." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2016. http://d-nb.info/1084582759/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Swelankomo, Nonkululeko. "Molecular phylogeny, radiation patterns and evolution of life-history traits in Ursinia (Anthemideae, Asteraceae)." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1793.

Full text

Abstract:

Thesis (MSc (Botany and Zoology))--Stellenbosch University, 2008.<br>Sequence data from the Internal Transcribed Spacer (ITS) of the nuclear ribosomal DNA were used to study the phylogenetic relationships in the genus Ursinia Gaertn. (Asteraceae, Anthemideae) in the southern African region. Closely related genera, i.e. Cotula L., Osteospermum L. and Agoseris Raf., were used as outgroups. The study also included maximum parsimony and principal component analyses. The taxa within the genus Ursinia had previously been classified into two subgenera, Ursinia and Sphenogyne R.Br., mainly on th

APA, Harvard, Vancouver, ISO, and other styles

28

Lepers, Clotilde. "Pollinators : demanding partners : Investigating the interplay between plant-pollinator interactions and plant traits evolution." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10188/document.

Full text

Abstract:

La grande majorité des plantes à fleurs se reproduisent grâce à leurs pollinisateurs. L’évolution chez les plantes est pourtant souvent étudiée sans prendre en compte ces interactions, et cette thèse vise à mieux comprendre leur impact sur l’évolution des plantes. Dans un premier chapitre, je présenterai les effets connus des pollinisateurs sur le taux d’autofécondation des plantes et sur son évolution. Dans un second chapitre, j’ai modélisé l’évolution du taux d’autofécondation des plantes lorsque celui-ci affecte la démographie des plantes et des pollinisateurs, et l’investissement des plant

APA, Harvard, Vancouver, ISO, and other styles

29

Vereecken, Nicolas. "Pollinator-mediated selection, reproductive isolation and the evolution of floral traits in Ophrys (Orchidaceae)." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210518.

Full text

Abstract:

Cette thèse aborde l’écologie et l’évolution des relations qu’entretiennent les orchidées du genre Ophrys avec leurs pollinisateurs. L’approche comparative et la combinaison (i)<p>d’analyses chimiques de phéromones sexuelles et de parfums floraux, (ii) d’analyses génétiques avec des outils moléculaires, et (ii) de tests de comportement réalisés sur les insectes in situ nous ont permis d’éclairer certains aspects méconnus de ces interactions inter-spécifiques. La pollinisation des orchidées du genre Ophrys est assurée par des mâles d'abeilles ou de guêpes solitaires qui opèrent une tentative d’

APA, Harvard, Vancouver, ISO, and other styles

30

Toräng, Per. "Pollinators, Enemies, Drought, and the Evolution of Reproductive Traits in Primula farinosa." Doctoral thesis, Uppsala universitet, Växtekologi och evolution, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8207.

Full text

Abstract:

In this thesis, I combined comparative and experimental approaches to examine selection on reproductive traits and population differentiation in the insect-pollinated, self-incompatible, perennial herb Primula farinosa. More specifically, I (1) determined whether the effects of floral display and interactions with pollinators and seed predators, and plant reproductive success were frequency-dependent and affected by surrounding vegetation context, (2) examined the consequences of intermittent drought years on population dynamics using numerical simulations based on demographic data collected o

APA, Harvard, Vancouver, ISO, and other styles

31

Zablotski, Yury [Verfasser]. "Optimality and trait based approaches to sympatric speciation and sympatric co-evolution of predator and prey traits in marine plankton / Yury Zablotski." Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/105432820X/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Helmstetter, Andrew. "The evolution of diversity and life history traits in annual killifish (Austrolebias) and other Cyprinodontiformes." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/44831.

Full text

Abstract:

Members of the annual killifish genus Austrolebias live in temporary ponds across South America and possess a remarkable life cycle. These fish live in small ponds that dry out completely; killing the adults but not before they have laid eggs in the substrate of their pond. The desiccation-resistant eggs develop during the dry season, going through multiple stages of diapause until the next wet season rains trigger hatching and the cycle is repeated. There is considerable variation in size in Austrolebias, the largest species can reach up to 150mm in length while the typical size is just 40mm.

APA, Harvard, Vancouver, ISO, and other styles

33

Reynolds, Alan. "Applied evolution : an integrated approach to studying life history traits in response to drug selection." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7673/.

Full text

Abstract:

The use of chemical control measures to reduce the impact of parasite and pest species has frequently resulted in the development of resistance. Thus, resistance management has become a key concern in human and veterinary medicine, and in agricultural production. Although it is known that factors such as gene flow between susceptible and resistant populations, drug type, application methods, and costs of resistance can affect the rate of resistance evolution, less is known about the impacts of density-dependent eco-evolutionary processes that could be altered by drug-induced mortality. The ove

APA, Harvard, Vancouver, ISO, and other styles

34

Laugier, Guillaume. "Evolution du fardeau génétique et des traits liés à la reproduction au cours d'une invasion biologique." Thesis, Montpellier, SupAgro, 2013. http://www.theses.fr/2013NSAM0029/document.

Full text

Abstract:

Cette thèse porte un regard évolutif sur les invasions biologiques qui sont une menace écologique, économique et sanitaire grandissante.Qu'ils en soient la cause ou la conséquence, les invasions sont en effet le théâtre de changements évolutifs rapides et importants.Ces changements peuvent être liés à une différence de pression de sélection entre l'aire d'origine et l'aire envahie, mais peuvent aussi être initiés par des évènements démo-génétiques comme un goulot d'étranglement démographique ou l'admixture (hybridation intra-spécifique) entre populations génétiquement différentes.Les changemen

APA, Harvard, Vancouver, ISO, and other styles

35

Marinosci, Cassandra. "Sélection, plasticité et dérive façonnent les traits d’histoire de vie chez l’acarien ravageur de cultures Tetranychus urticae suite à un changement d'hôte." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT148/document.

Full text

Abstract:

Les herbivores polyphages sont des généralistes capables d’exploiter une large gamme de plantes hôtes. Au cours des travaux de cette thèse en évolution expérimentale, nous étudions l’évolution de traits d’histoire de vie de différentes populations d’une espèce de ravageur de culture, l’acarien Tetranychus urticae, suite à la colonisation d’un même nouvel hôte, la tomate. Au cours des deux premiers chapitres, des mesures de traits d’histoire de vie ont été collectées depuis le stade œuf jusqu’à la mort des individus permettant de décrire finement le cycle de vie de cet acarien en réponse à l’ex

APA, Harvard, Vancouver, ISO, and other styles

36

Tibblin, Petter. "Migratory behaviour and adaptive divergence in life-history traits of pike (Esox lucius)." Doctoral thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-42995.

Full text

Abstract:

Population divergence shaped by natural selection is central to evolutionary ecology research and has been in focus since Darwin formulated “The origin of species”. Still, the process of adaptive divergence among sympatric populations is poorly understood. In this thesis I studied patterns of adaptive divergence among subpopulations of pike (Esox lucius) that are sympatric in the Baltic Sea but become short-term allopatric during spawning and initial juvenile growth in freshwater streams. I also examined causes and consequences of phenotypic variation among individuals within subpopulations to

APA, Harvard, Vancouver, ISO, and other styles

37

Trouvé, Sandrine. "Evolution des stratégies de la reproduction et des traits d'histoire de vie chez les plathelminthes parasites." Perpignan, 1997. http://www.theses.fr/1997PERP0284.

Full text

Abstract:

Les strategies de la reproduction et les echanges genetiques d'un plathelminthe, trematode parasite hermaphrodite, ont ete etudies. L'approche experimentale a ete developpee sur 3 isolats geographiques de l'echinostome echinostoma caproni. Nous montrons que cette espece presente un mode de reproduction mixte associant a la fois de l'autofecondation et de l'allofecondation. Toutes les possibilites de fecondation entre individus d'origines geographiques differentes sont possibles allant jusqu'a des fecondations multiples ; cependant une tendance marquee vers des croisements preferentiels intra-i

APA, Harvard, Vancouver, ISO, and other styles

38

Palacio, Lopez Kattia Paola. "Effects Of Plasticity And Hybridization On Life History Traits In Arabidopsis Thaliana Ecotypes." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/816.

Full text

Abstract:

Understanding the strategies that plant populations implement to increase evolutionary responsiveness to better survive environmental changes induced by climate change is a critical challenge for ecology and evolutionary studies. This dissertation investigates the role of hybridization, local adaptation, and phenotypic plasticity in plant population responses to environmental change. Specifically, I utilized meta-analysis techniques to investigate the prevalence of local adaptation and phenotypic plasticity as the two main mechanisms used to adapt to heterogeneous environments, and experimenta

APA, Harvard, Vancouver, ISO, and other styles

39

Thomann, Michel. "Evolution des stratégies de reproduction des plantes à fleurs face aux changements globaux et au déclin des pollinisateurs." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20230.

Full text

Abstract:

De nombreuses populations voient leurs conditions de vie modifiées par les changements globaux. Au-delà de leurs conséquences écologiques, les changements globaux peuvent également modifier les régimes de sélection des populations. Le déclin récent des pollinisateurs pourrait altérer fortement le succès reproducteur de nombreuses populations de plantes à fleurs. Cependant, ses conséquences évolutives n'ont pas été étudiées jusqu'ici. Cette thèse traite de la possibilité d'adaptation des stratégies de reproduction des plantes face aux changements globaux et plus spécifiquement face au déclin de

APA, Harvard, Vancouver, ISO, and other styles

40

Pichler, Michael Markus [Verfasser]. "On the intergenerational formation and evolution of continuous cultural traits / Michael Markus Pichler. Institut für Mathematische Wirtschaftsforschung (IMW)." Bielefeld : Universitätsbibliothek Bielefeld, Hochschulschriften, 2011. http://d-nb.info/1013553004/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Maughan, Peter Jeffrey. "Microsatellite polymorphism, orthologous evolution and molecular marker analysis of seed quality traits in soybean (Glycine max L. Merr.)." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-163918/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Roget, Tristan. "Selection-mutation dynamics with age structure : long-time behaviour and application to the evolution of life-history traits." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX111/document.

Full text

Abstract:

Cette thèse est divisée en deux parties reliées par un même fil conducteur. Elle porte sur l'étude théorique et l'application de modèles mathématiques décrivant des dynamiques de population où les individus se reproduisent et meurent à des taux dépendant de leur âge et d'un trait phénotypique. Le trait est fixé durant la vie de l'individu. Il est modifié au fil des générations par des mutations apparaissant lors de la reproduction. On modélise la sélection naturelle en introduisant un taux de mortalité densité-dépendant décrivant la compétition pour les ressources.Dans une première partie, nou

APA, Harvard, Vancouver, ISO, and other styles

43

Frenzke, Lena, Paul Goetghebeur, Christoph Neinhuis, Marie-Stephanie Samain, and Stefan Wanke. "Evolution of Epiphytism and Fruit Traits Act Unevenly on the Diversification of the Species-Rich Genus Peperomia (Piperaceae)." Frontiers Media, 2016. https://tud.qucosa.de/id/qucosa%3A29068.

Full text

Abstract:

The species-rich genus Peperomia (Black Pepper relatives) is the only genus among early diverging angiosperms where epiphytism evolved. The majority of fruits of Peperomia release sticky secretions or exhibit hook-shaped appendages indicative of epizoochorous dispersal, which is in contrast to other flowering plants, where epiphytes are generally characterized by fruit morphological adaptations for anemochory or endozoochory. We investigate fruit characters using Cryo-SEM. Comparative phylogenetic analyses are applied for the first time to include life form and fruit character information to s

APA, Harvard, Vancouver, ISO, and other styles

44

Frenzke, Lena, Paul Goetghebeur, Christoph Neinhuis, Marie-Stephanie Samain, and Stefan Wanke. "Evolution of Epiphytism and Fruit Traits Act Unevenly on the Diversification of the Species-Rich Genus Peperomia (Piperaceae)." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-217325.

Full text

Abstract:

The species-rich genus Peperomia (Black Pepper relatives) is the only genus among early diverging angiosperms where epiphytism evolved. The majority of fruits of Peperomia release sticky secretions or exhibit hook-shaped appendages indicative of epizoochorous dispersal, which is in contrast to other flowering plants, where epiphytes are generally characterized by fruit morphological adaptations for anemochory or endozoochory. We investigate fruit characters using Cryo-SEM. Comparative phylogenetic analyses are applied for the first time to include life form and fruit character information to s

APA, Harvard, Vancouver, ISO, and other styles

45

Early, Catherine Michele. "Quantitative Assessments of Avian Endocasts as Tools for Inferring Neuroanatomical Traits and Potential Functional Capabilities." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554132803369615.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Johansson, Åsa. "Genome Variation in Human Populations : Exploring the Effects of Demographic History and the Potential for Mapping of Complex Traits." Doctoral thesis, Uppsala University, Department of Genetics and Pathology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7293.

Full text

Abstract:

<p>A major challenge in human genetics is to understand the genetic variation underlying common diseases. In this thesis, I focus on forces creating differences between individuals and genomic regions, methods for characterizing genomic variation, and the association between genomic and phenotypic variation. Genetic markers are widely used to locate genes associated with different phenotypes. In my first paper, I describe novel algorithms for automatic genotype determination of microsatellite markers, a procedure which is currently both time-consuming and error prone. </p><p>The co-segregation

APA, Harvard, Vancouver, ISO, and other styles

47

Valverde-Barrantes, Oscar Jesus. "A phylogenetic perspective on fine root ecology: assessing the role of root evolution on fine root functional traits and ecological interactions in woody angiosperms." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1384641579.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Muñoz, Andirkó Alejandro Gregorio. "Modern brains and bones: genomic analysis of derived Homo sapiens traits." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/672530.

Full text

Abstract:

Over the last years we have come to realize that the history of our species is not as simple as we once thought. We are now faced with complex demographic scenarios, events of admixture with human species and the realization that our differences with Neanderthals might be of gradient, not quality. Knowing all of this, we have to face the question of what did in fact change since the emergence of our species, to what extent, when did it happened in our evolution, and what consequences those changes bring for complex traits. This thesis tries to contribute answers to these questions, either thro

APA, Harvard, Vancouver, ISO, and other styles

49

Konstantinidis, Dimitrios [Verfasser], and Kiran R. [Akademischer Betreuer] Patil. "Directed Evolution of Costly Metabolic Traits: use of microbial communities and metabolic modelling. / Dimitrios Konstantinidis ; Betreuer: Kiran R. Patil." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1236632907/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Lukasik, Piotr. "The facultative endosymbionts of grain aphids and the horizontal transfer of ecologically important traits." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:6aedd183-2dde-4099-a74a-e3f7c909546a.

Full text

Abstract:

Insects are often infected with facultative endosymbiotic bacteria, which can have a range of important ecological effects. The grain aphid, Sitobion avenae, harbours diverse facultative symbionts, which suggests their importance in grain aphid biology. This thesis attempts to explain the ecological roles of the facultative endosymbionts in S. avenae. It also examines the question of whether the horizontal transmission of symbionts between aphid clones and species can be important for shaping the ecology and evolution of multi-species aphid communities. Novel techniques developed for research

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!