Now showing items 21-30 of 255
Contact zone dynamics and the evolution of reproductive isolation in a North American treefrog, the spring peeper (Pseudacris crucifer)
Despite over seven decades of speciation research and 25 years of phylogeographic studies, a comprehensive understanding of mechanisms that generate biological species remains elusive. In temperate zones, the pervasiveness ...
Assessing Diatom Shifts in Embayments and Lakes in and Around Georgian Bay (Lake Huron) Using Paleolimnology
Freshwater ecosystems in Ontario are affected by a growing number of multiple stressors, with climate change often acting as a “threat multiplier”. Diatom-based paleolimnological approaches are used to provide the much ...
A comparative paleolimnological assessment of the influences of early Arctic population groups on freshwater ecosystems from southern Baffin Island, Nunavut
Recent paleolimnological research in the eastern Canadian high Arctic on the ecological impact of the Thule c.1000-1500 AD has documented the influence of prehistoric anthropogenic activities. Six lake and pond sites ...
The genomic consequences of sexual selection
Sex-differences in phenotype, development, and life-history can alter the strength of selection experienced by males and females. In particular, theoretical models have demonstrated that differences in the strength of ...
Does the goldfish COX4-1 gene promoter possess cold-responsive elements?
Mitochondrial biogenesis permits tissues to increase mitochondrial content in response to environmental and physiological stressors. In many species of fish mitochondrial biogenesis is triggered by cold exposure. The greater ...
Investigating the Effects of Increased ACT11 Expression on Sexual Reproduction and Trichome Branching in Arabidopsis
Activation-tagging is a powerful functional genomics technique used to identify plant genes and their functions. The random introduction of gene enhancers into the plant genome results in the overexpression of nearby genes, ...
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The Genetic Architecture of Life History in Drosophila
An organism’s entire life history - the timing of development, reproduction, senescence and death - can depend on the nature of selection for reproductive age. The outcome of selection will depend both on the particular ...
Linking courtship behaviour, colour perception and mate choice decisions in peafowl
Despite a long history of study showing that male courtship signals influence female mate choice in many species, we lack a good understanding of how females choose. What are the mechanisms of mate choice, and how do these ...
The evolutionary consequences of sperm senescence in Drosophila melanogaster
Sperm senescence, a decline in sperm quality caused by male ageing and by sperm ageing before or after copulation, may have fitness costs manifested as infertility or lowered genetic quality of offspring. This thesis tested ...