Browsing Department of Biology Graduate Theses by Title
Now showing items 100-119 of 345
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Ecological Differentiation in a Hybridizing Cryptic Species Complex
(2012-01-04)The hybridizing Daphnia mendotae and D. dentifera (Crustacea: Cladocera) are sympatric throughout much of North America, and are considered a cryptic species complex due to their lack of phylogenetically informative ... -
Ecological effects of Hemimysis anomala on the nearshore fish community of Lake Ontario
(2012-04-05)Species invasions are regarded as one of the most serious threats to biodiversity and native ecosystems and our ability to predict and quantify the impacts of invasive species has been an arduous task. Since the 1840s, the ... -
Ecology of the Imperiled Grass Pickerel (Esox americanus vermiculatus) in Ontario: Distribution Patterns and Population Decline
(2015-10-03)Freshwater fishes are among the most imperiled organisms on Earth and understanding their life history is vital to conservation efforts. Grass Pickerel, a top predator, is a nationally imperiled fish that is found at the ... -
The Effect Manipulating AMPK Activity has on Ouabain-Induced Spreading Depression in Fed and Starved Locusta Migratoria.
(2015-10-03)Neurons, though highly metabolically active, have a poor capacity for nutrient storage and are sensitive to energy fluctuations. One mechanism for maintaining energetic homeostasis involves activation of the heterotrimeric ... -
Effect of Colchicine on Endosperm Development in Helianthus Annuus.
(2008-11-10)Embryogenesis was observed through light and transmission electron microscopy to elucidate the role of the cytoskeleton in the cellularization of the coenocytic endosperm in Helianthus annuus. Microtubules were not seen ... -
The effect of copper on kairomone-mediated responses by wild Daphnia pulicaria clones from along a copper gradient
(2009-12-23)Kairomones are infochemicals that benefit a heterospecific receiver. Chaoborus spp. release a kairomone from their gut when feeding on Daphnia spp. Daphnia respond to kairomone by shifting life history parameters or ... -
The Effect of Gonadotropin Releasing Hormone on Opsin Gene Expression and Spectral Sensitivity in Zebra Cichlid Fish (Metriaclima zebra).
(2011-01-06)Sexual selection and the maintenance of species diversity in Lake Malawi cichlid fishes are greatly dependent on optical communication, which is influenced by environmental, physiological and endocrinological factors. The ... -
The effect of hybridization on metabolism and hypoxia tolerance in sunfish
(2013-08-30)Hybridization between species has the potential to exert pleiotropic effects on metabolism. Reduced fitness in hybrids may arise through incompatibilities between nuclear- and mitochondrial-encoded subunits of the enzyme ... -
Effect of nutritional status on phenotypic characteristics of Arabidopsis and alfalfa in relation to the expression of AtSnRK2.9
(2007-10-01)The mechanisms of plant response to nutrient limitation and utilisation are of great interest for agricultural purposes. Phosphate is a non-renewable resource and is one of the most important nutrients required for plant ... -
The Effect of Short-Term Intermittent Aerobic Exercise Training on the Carbohydrate Metabolism of Goldfish (Carassius Auratus) Subject to Environmental Hypoxia
(2011-09-30)Goldfish subjected to an intermittent short-term aerobic exercise training regime prior to acute hypoxic exposure demonstrated a shift in hypoxia response. Intermittent aerobic training enhanced the aerobic potential of ... -
The Effect of the Invasive Macroinvertebrate, Bythotrephes Longimanus, on the Growth of Cisco (Coregonus Artedii) in Ontario Shield Lakes
(2010-07-20)Bythotrephes longimanus is an invasive, macroinvertebrate from Eurasia that was introduced into the Great Lakes region in the mid 1980s. Bythotrephes introductions into lake ecosystems have resulted in substantial changes ... -
Effects of Ammonia on Growth and Metabolism in Tilapia, Oreochromis Niloticus
(2009-08-11)Nile tilapia (Oreochromis niloticus) is an important species in the expansion of aquaculture, which supplements strained natural fish stocks worldwide. Although nitrogen accumulation in aquaculture has been documented as ... -
Effects of an invasive consumer on zooplankton communities are unaltered by nutrient inputs
(2014-01-31)Interactions between multiple anthropogenic stressors can have unexpected synergistic or antagonistic effects, making it difficult to predict their combined effect using single stressor studies. The interaction between ... -
The Effects of Diluted Bitumen on Developing Fathead Minnow (Pimephales Promelas)
Canada has experienced a significant increase in the transport of diluted bitumen (dilbit), a predominant oil sands product that is created by combining bitumen with diluents derived from oil-gas condensates and other ... -
Effects of Environmental Factors, Physical Barriers and Season on the Fish Community Composition of the Lower Ottawa and Mississippi River Systems as Determined from Quantitative Electrofishing
(2013-01-18)Environmental and physical conditions are considered primary drivers of fish community assemblages. The anthropogenic alteration of aquatic ecosystems is implicated as a primary threat to fisheries worldwide. In riverine ... -
The effects of habitat connectivity and regional heterogeneity on artificial pond metacommunities
(2008-10-21)While much evidence suggests that ecosystem functioning is closely related to biodiversity, present rates of biodiversity loss are high. With the emergence of the metacommunity concept ecologists have become increasingly ... -
Effects of Heatshock on the Na+/K+-ATPase in Locusta migratoria
(2011-09-27)Most vertebrates suffer permanent damage after minutes of anoxia. Many insects however, have part of their life cycle in anoxia or constant hypoxia, such as during their egg-hatching phase, by living as deep burrowers, or ... -
The effects of increasing chloride concentrations and temperatures on freshwater zooplankton communities
Across the Northern Hemisphere, chloride concentrations in lakes are increasing from decades of road salt use, imperiling aquatic ecosystems. Elevated chloride concentrations threaten aquatic organisms, and zooplankton are ... -
The Effects of Metabolic Depression Induced by Food Deprivation on Hypoxia Tolerance of Juvenile Rainbow Trout (Oncorhynchus mykiss)
(2011-10-13)Hypoxic condition is a naturally occurring environmental stressor in aquatic ecosystems. However, due to modern anthropocentric activities, hypoxia has been increasing in prevalence and severity. Rainbow trout, a keystone ... -
Effects of peripherality and hybridization on range-wide genetic structure of the coastal dune plant Abronia umbellata (Nyctaginaceae)
The pattern of genetic variation across a species range may give insight into geographic variation in adaptive capacity and hence, conservation priority. For this reason, determining the factors that may influence range-wide ...