Browsing Department of Biology Graduate Theses by Title
Now showing items 302-321 of 370
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Regulation of the Cdc25 mitotic inducer following replication arrest and DNA damage
(2011-06-20)Dephosphorylation of the Cdc2 kinase by the Cdc25 tyrosine phosphatase is the universally conserved trigger for mitotic entry. Cdc25 is also the point of convergence for checkpoint signaling pathways which monitor the ... -
Relationships between body size, reproduction, and abundance in natural vegetation
(2012-07-31)According to traditional theory, superior competitive ability in plants generally requires a relatively large plant body size. Yet, within natural, crowded vegetation, most resident species are small, and species size ... -
Relationships Between Winter Energetic Condition and Reproductive Investment in a Wild Bird
Reproduction is an energetically demanding life history stage that comprises costly physiological and behavioural changes. Despite these costs, some individuals invest more in reproduction, and breed more successfully than ... -
The Relative Importance of Population Size, Colonist Quality, and Colonist Arrival Frequency for Population Success
Successful population establishment, subsequent population dynamics, and extinction have all repeatedly been shown to be affected by the quantity of initial colonists. However, there are other, less studied factors that ... -
Reliability, Accuracy, and Tracking Techniques of Inuit Hunters in Estimating Polar Bear Characteristics From Tracks
(2010-08-17)Inuit estimates of polar bear characteristics from tracks could complement ongoing capture-mark-recapture methods to frequently monitor polar bear populations in response to climate-induced habitat changes. Before the ... -
The response of Cladocera assemblages and size structure to multiple stressors in three Kawartha lakes (Ontario) over the last 200 years)
The Kawartha lakes region has experienced many impacts from human activities since the European settlement in early 1800s including damming, logging, agricultural activities, fisheries, urbanization, and the introduction ... -
Response of cladocerans to native and invasive invertebrate predators in Lake Simcoe, Canada
How populations respond to changing environmental conditions is critical to their survival. Organisms can respond adaptively to new environmental conditions, for example an invasive predator, by the expression of phenotypic ... -
The Response of Discostella Species to Climate Change at the Experimental Lakes Area, Canada
(2014-07-02)Global climate change is threatening both our water quality and quantity. Specifically, the influence of climate change on freshwater lakes includes decreased water availability, increased evapotranspiration, changes in ... -
Responses of zooplankton community structure and ecosystem function to the invasion of an invertebrate predator, Bythotrephes longimanus
(2007-07-20)Freshwater ecosystems face unprecedented levels of human-induced stresses and it is expected that the invasion of non-indigenous species will cause the greatest loss of biodiversity in lakes and rivers worldwide. Bythotrephes ... -
A Role for Insulin Signaling in Regulating the PTEN Tumour Suppressor in Caenorhabditis Elegans
(2013-02-05)Many obese individuals and type 2 diabetes mellitus (T2DM) patients have elevated levels of insulin. Hyperinsulinemia is a major cancer risk factor in T2DM individuals and activated insulin receptor (IR) has been linked ... -
The Role of Breeding Habitat Loss in the Decline of Eastern Whip-Poor-Will (Antrostomus Vociferus) Populations in Canada
(2015-09-21)Populations of birds that feed on flying insects (i.e., aerial insectivores) have been declining for several decades in North America, yet the cause of these declines is poorly understood. Among aerial insectivores, Eastern ... -
Role of bubbling from aquatic sediments in mercury transfer to a benthic invertebrate in the St. Lawrence River, Cornwall, Ontario
(2009-01-05)Benthic uptake of mercury (Hg) governs bioavailability to fish yet there are still large gaps in our knowledge of what mediates this process. Without this information it is difficult to ascertain where Hg accumulation in ... -
The Role of Chironomids as Paleoecological Indicators of Eutrophication in Shallow Lakes Across a Broad Latitudinal Gradient
The aquatic larvae of chironomids (Diptera, Chironomidae) were historically classified according to lake trophic status, and taxa classified as “eutrophic” were labeled as such because of adaptations for surviving hypoxic ... -
The Role of Dispersal During the Recovery of Acid-Damaged Zooplankton Communities
(2011-12-21)Ecologists studying acid-damaged zooplankton communities have often documented a time lag in recovery following pH increases. While previous work has provided a solid understanding of the local factors that may delay ... -
The Role of Invasive Bythotrephes longimanus in Lake Food Webs
(2008-01-15)Bythotrephes longimanus, a predatory exotic cladoceran, has spread rapidly to numerous lakes through the Laurentian Great Lakes region of Ontario and North America. Post-invaded lakes are known to have reduced zooplankton ... -
The Role of Schizosaccharomyces Pombe SER/THR Kinase in Growth, Stress Response and Nutrient Deprivation
(2012-01-24)Continuous sensation and reaction to environmental fluctuations is especially critical to the survival of unicellular organisms. Stress response mechanisms are essential for cells during the vegetative and sexual life ... -
The role of the visual train ornament in the courtship of peafowl, Pavo cristatus
(2008-09-15)The peacock (Pavo cristatus) has long been considered the quintessential example of a sexually selected animal, and in the last two decades, peafowl have provided widely-cited evidence for female mate choice as well as the ... -
The Roles of EFN-1 and Seam cell V2 in the Transmission of a Stop Cue for the Posterior Lateral Microtubule in Caenorhabditis Elegans
(2016-09-30)A functional nervous system requires the precise arrangement of all nerve cells and their neurites. To achieve this correct assembly, a myriad of molecular guidance cues works together to direct the outgrowth of neurites ... -
The Roles of the Neuropeptide Receptor NPR-14 in the Regulation of Sleep Behaviours in Caenorhabditis elegans
Most animals with a nervous system exhibit sleep behaviour(s) during their life cycle, which appears as a decreased level of physical activity and changes in metabolism. Even animals with a simple nervous system like ... -
Scaling of Metabolic Enzymes: Transcriptional Basis of Interspecies Variation in Mitochondrial Content
(2010-06-15)Mitochondrial content, an important determinant of muscle metabolic capacity, changes in individuals during development, and in response to physiological and environmental challenges. This phenotypic plasticity is attributed ...