Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 116 for “"local adaptation"”.
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Evidence for Local Adaptation in Birds
… within species are commonly assumed to represent local adaptations to different environments. In order for local adaptation to evolve by natural selection, three conditions must be met: (1) traits must vary geographically, (2) local variants of traits must provide a fitness advantage (increased …
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Local Adaptation for Life-History Traits in Silene Latifolia
… was to test if Silene latifolia has become locally adapted across its range. My first experiment tested local adaptation of germination success to three temperatures across three latitudinal regions in a growth chamber using seeds from nine EU and NA populations. Germination success or speed …
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Local adaptation to climate change in a calcareous grassland system
… England (UK). Here I investigated the role of local adaptation as mechanism of the apparent resistance of species' to long-term climate manipulations at BCCIL using a common forb, Plantago lanceolata. Plantago lanceolata is a rosette-forming, perennial herb of wide-ranging distribution, and one …
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Local Adaptation Signatures in Thermal Performance of the Temperate Coral Astrangia poculata
… the roles of phenotypic plasticity and local adaptation in coral physiological tolerance limits. <em>Astrangia poculata</em> inhabits hard bottom ecosystems from the northwestern Atlantic to the Gulf of Mexico and withstands an annual temperature range up to 20°C. Additionally, <em>A. …
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Population differentiation, dispersal limitation, and local adaptation in the gametophytic fern Vittaria appalachiana
… transplanted amongst each population to test for local adaptation. Finally, explants from each of the six source populations were exposed to various temperature and humidity conditions, to test for phenotypic plasticity in response to temperature and humidity. ^ Cumulative results from these three …
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Floral traits and pollination of Solidago altissima: mechanisms of local adaptation among and within biomes
Solidago altissima is an herbaceous, clonal plant that has differentiated into two subspecies in the prairie and forest biomes in Minnesota. The mechanisms that have driven the divergent evolution of these subspecies are not well understood. The evolution of floral traits is influenced by the …
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The spatial scale of adaptive population differentiation in Atlantic Salmon: local adaptation in smolt migration timing
… the question of whether there is evidence for local adaptation in migratory behaviour of Atlantic salmon. Specifically, it aims to examine variation in the timing of smolt migration among independent tributaries of single river systems and to screen individual fish for molecular genetic …
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Local adaptation of Geoffroy's horseshoe bat, Rhinolophus clivosus, to the Cape floristic region of South Africa
… in which they live. This study investigated local adaptation in Rhinolophus clivosus (Chiroptera: Rhinolophidae) by comparing its phenotype with that of a co-occurring endemic species. R. capensis, in the Cape Floristic Region of South Africa. If R. clivosus has become locally adapted, its …
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Signatures of natural selection and local adaptation in Populus trichocarpa and Populus deltoides along latitudinal clines
… on circadian clock-related genes in climatic adaptation, I took a candidate gene approach, selecting circadian clock genes, some of which had been functionally validated, and others hypothesized, to identify signatures of natural selection in Populus trichocarpa and P. deltoides. Using both …
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Plasticity, Intraspecific Variability and Local Adaptation to Climatic Extreme Events of Ecotypes/Provenances of Key Plant Species
… keep track with by natural dispersal or genetic adaptation. Agriculture, forestry and ecosystem management must develop counteracting practices to secure the persistence and functioning of these ecosystems and thus their provision of goods and services. Therefore it is important to develop a …
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Loose policy and local adaptation : a comparative study of masters degrees in the context of the Bologna Process
… and institutional responses determined by local or situated circumstances. To capture the transformation of policy and the evolution of actor conceptions at European, national and institutional level, the implementation staircase approach has been used. The research found that similarities …
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State zoning legislation and local adaptation : an evaluation on the implementation of Massachusetts Chapter 40R Smart Growth Legislation
… adopting a Smart Growth zoning district in their local zoning ordinance/by-laws which allows dense housing development as-of-right. Participating municipalities will receive a Zoning Incentive Payment upon creating the district, based on the additional number of housing units allowed as-of-right …
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Local adaptation to parasites and selection on major histocompatibility genes in ecologically divergent populations of three-spine stickleback (Gasterosteus aculeatus)
… This trade-off in resistance should generate local adaptation to parasites in different habitats. In chapter one, I show how local adaptation can potentially evolve in response to variation in parasite exposure among eighteen ecologically variable populations of threespine stickleback …
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Dispersal, gene flow, niche divergence and local adaptation in the hyper-diverse ruschioid Aizoaceae: testing alternative modes of speciation in the Knersvlakte quartz field flora of the Succulent Karoo, South Africa
… made it possible to tease apart the roles of local adaptation and limited dispersal in driving gene flow and speciation in the system. Quartz fields were found to be a highly insular habitat with strong internal edaphic community structure, suggesting that they represent an environmental …
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Diet Breadth Evolution and Diversification of a Generalist Insect Herbivore
… lead to diversification of insect herbivores is local adaptation to their host plants. However, high gene flow between individuals feeding on different plants, as is the case for generalists, can lead to low levels of local adaptation. Using common garden and transplant experiments, I found mixed …
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Genomics-enabled breeding for sorghum in West Africa
… areas, corresponding to variable and diversified local contexts. The genetic basis of local adaptation and farmer preferences and their applications in breeding need further studies. Recent genotyping methods have provided access to high-density markers and their applications in breeding. In this …
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The responses of Arabidopsis lyrata ssp. petraea to environmental stimuli
… species’ distributions and for investigation of local adaptation. The main objective of this study was to investigate whether or not geographically isolated populations of A. l. petraea differ in their responses to environmental stimuli and thus demonstrate potential for local adaptation. Under …
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How Are Rare Species Maintained?: Reproductive Barriers Between Layia jonesii, a Rare Serpentine Endemic, and L. platyglossa
… system is due to (1) habitat isolation due to local adaptation to differential edaphic environments on the hillside, (2) flowering time differences, and (3) reduced seed set resulting from hybrid crosses. To investigate the local adaptation of <em>L. jonesii</em> and <em>L. platyglossa, </em>I …
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Latitudinal Gradient Facilitates Adaptive Population Differentiation of Campanulastrum americanum (American Bellflower)
<p>Local adaptation is characterized by higher reproductive fitness by individuals present in their native habitats relative to nonlocals. This study utilized Campanulastrum americanum as a model for assessing whether an environmental gradient can facilitate local adaptation. In particular, I …
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