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 16 of 16 for “"within-species variation"”.
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Plant growth responses to winter climate change: from amongand within-species variation to plant-soil interactions
… to bring about differences in among- and within-species growth responses. The objective was to detect growth differences in the responses of species, ecotypes and plant functional groups to winter processes impacted by warmer temperatures. Therefore, experiments were carried out to …
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Spatial, temporal and within-species variation in the foraging ecology of a marine predator across a dynamic seascape
Spatial, temporal and within-species variation in the foraging ecology among consumers add to the complexities of trophic structure and its processes across all biomes on Earth. In this dissertation, I investigated the foraging ecology and plasticity of an ice-adapted marine predator, the ringed …
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A mastofauna do estado do Rio de Janeiro, com especial referência à ordem Polyprotodontia (Marsupiais)
… density-independent factors that might affect species' presence are reviewed, as is the history of mammal collecting and studies since the 16th century. A provisional species list for the state is also given. To exemplify the treatment to be given to the rest of the mammal fauna, the thirteen …
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A multi-scale exploration of the drivers and implications of germination strategy in Australian alpine plants
… global warming because they are characterized by species adapted to low temperatures. Although adapted to low temperatures, alpine plants may still be capable of persisting under a changing climate and this will largely be dependent on the ability of their seeds to germinate, establish and …
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A multi-scale exploration of the drivers and implications of germination strategy in Australian alpine plants
… global warming because they are characterized by species adapted to low temperatures. Although adapted to low temperatures, alpine plants may still be capable of persisting under a changing climate and this will largely be dependent on the ability of their seeds to germinate, establish and …
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Sociosexual Development: Infusing the Belsky, Steinberg, and Draper Model with Sexual Selection
… history theory attempts to explain between- and within-species variation in maturational and reproductive patterns, whereas sexual selection attempts to explain between- and within-sex differences in intersexual mate choice and intrasexual competition for members of the opposite sex. These two …
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Cities for birds, birds for cities: The urban ecology of birds across scales from global sampling to individual responses
… monitoring framework to city-level drivers of species prevalence and individual behavioural responses to human activity in an urban songbird. In Chapter 2, I describe and validate the Global Urban Bird Survey, a standardized acoustic monitoring protocol applied across multiple cities to …
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Leaf and canopy responses to forest degradation and extreme climatic events: a remote sensing perspective
… traits remotely. Working with six temperate tree species in contrasting soil types, I explore the relationship between leaf structure and chemistry and spectral characteristics. We show that interspecific differences in leaf traits were generally much stronger than intraspecific differences …
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Individual-Level Causes and Population-Level Consequences of Variation in Fitness in an Alpine Rodent
… the stochastic and selective causes of variation in fitness components, and the evolutionary consequences of this variation in a wild rodent population. It shows the contemporary genetic evolution of body mass and decouples classic estimates of selection from adaptive evolution. The …
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Spatial variation in functional traits and grazing value of savanna grasses at the community and species level
… composition and functioning and, therefore, how species composition and trait expression potentially link habitat conditions to ecosystem processes. This is particularly true for grasses, despite this taxon having considerable ecological and economic importance. The grass family (Poaceae) is a …
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Variability in water use by phreatophytic Banksia woodland vegetation of the Swan Coastal Plain, Western Australia
… in source-water utilisation by Banksia woodland species overlying a shallow aquifer on the Swan Coastal Plain in Western Australia These were studied to identify the importance of groundwater as a water source to this vegetation. Intra-and interspecific variation in seasonal water use was …
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A 3D Geometric Morphometric Investigation of Relatedness in the Modern Human, Chimpanzee, and Homo naledi Postcranial Skeleton
<p>Studies of skeletal variation form the basis of our understanding of our species’ history and diversity. This most commonly takes the form of comparative, between- species studies aimed at reconstructing phylogenetic relationships. However, studies of within-species variation can provide …
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Effects of climate change on plants and ecosystem functioning : Implications for managed temperate grasslands
… emergence and N status) of selected plant species, their populations, artificial plant communities as well as a semi-natural managed temperate grassland ecosystem were investigated. Seasonal (winter/summer) warming advanced flowering phenology and altered biomass production of early vs. …
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The evolution and genetics of vector competence in mosquito disease vectors
… parasite from one host to another. It influences variation in disease transmission among mosquito populations, hence affecting disease epidemiology. In this project, I have studied some aspects of ecological interactions and genetic factors in a step towards understanding how these affect …
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What’s in a Tooth? Signals of Ecogeography and Phylogeny in the Dentition of Macaques (Cercopithecidae: Macaca)
… geography, ecology, phylogeny, and phenotypic variation among macaques was investigated. Constraints to phenotypic variation – and thus evolution – were also analysed in the form of observed amounts of phenotypic variation and patterns of phenotypic integration. A total of 72 standard linear …
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Intraspecific variation in resource use, dormancy investment, and competitive ability in the facultative parthenogen Daphnia pulicaria
Ecological studies highlight that many species and most populations maintain high degrees of intraspecific (within species or within population) variation in a wide variety of life-history traits. This pattern prompts the question: how important is this variation? This is a question that is …